public bool IsResolvable(string host)
{
if (String.IsNullOrEmpty(host))
{
return(false);
}
int millisecond_time_out = 1000;
ResolveState ioContext = new ResolveState(host);
var result = Dns.BeginGetHostEntry(ioContext.HostName, null, null);
var success = result.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(millisecond_time_out), true);
if (!success)
{
ioContext.Result = Resolvetype.Timeout;
}
else
{
try
{
var ipList = Dns.EndGetHostEntry(result);
if (ipList == null || ipList.AddressList == null || ipList.AddressList.Length == 0)
{
ioContext.Result = Resolvetype.InvalidHost;
}
else
{
ioContext.Result = Resolvetype.Completed;
}
}
catch
{
ioContext.Result = Resolvetype.InvalidHost;
}
}
return(ioContext.Result == Resolvetype.Completed);
}
[Test] // BeginGetHostEntry (String, AsyncCallback, Object)
public void BeginGetHostEntry2_HostNameOrAddress_UnspecifiedAddress()
{
// IPv4
try {
Dns.BeginGetHostEntry(
"0.0.0.0",
new AsyncCallback(GetHostEntryCallback),
null);
Assert.Fail("#1");
} catch (ArgumentException ex) {
// IPv4 address 0.0.0.0 and IPv6 address ::0 are
// unspecified addresses that cannot be used as
// a target address
Assert.AreEqual(typeof(ArgumentException), ex.GetType(), "#2");
Assert.IsNull(ex.InnerException, "#3");
Assert.IsNotNull(ex.Message, "#4");
Assert.AreEqual("hostNameOrAddress", ex.ParamName, "#5");
}
// IPv6
try {
Dns.BeginGetHostEntry(
"::0",
new AsyncCallback(GetHostEntryCallback),
null);
Assert.Fail("#1");
} catch (ArgumentException ex) {
// IPv4 address 0.0.0.0 and IPv6 address ::0 are
// unspecified addresses that cannot be used as
// a target address
Assert.AreEqual(typeof(ArgumentException), ex.GetType(), "#2");
Assert.IsNull(ex.InnerException, "#3");
Assert.IsNotNull(ex.Message, "#4");
Assert.AreEqual("hostNameOrAddress", ex.ParamName, "#5");
}
}
public static void EventSource_ResolveInvalidHostName_LogsStartFailureStop()
{
RemoteExecutor.Invoke(async() =>
{
const string InvalidHostName = "invalid...example.com";
using var listener = new TestEventListener("System.Net.NameResolution", EventLevel.Informational);
var events = new ConcurrentQueue <EventWrittenEventArgs>();
await listener.RunWithCallbackAsync(events.Enqueue, async() =>
{
await Assert.ThrowsAnyAsync <SocketException>(async() => await Dns.GetHostEntryAsync(InvalidHostName));
await Assert.ThrowsAnyAsync <SocketException>(async() => await Dns.GetHostAddressesAsync(InvalidHostName));
Assert.ThrowsAny <SocketException>(() => Dns.GetHostEntry(InvalidHostName));
Assert.ThrowsAny <SocketException>(() => Dns.GetHostAddresses(InvalidHostName));
Assert.ThrowsAny <SocketException>(() => Dns.EndGetHostEntry(Dns.BeginGetHostEntry(InvalidHostName, null, null)));
Assert.ThrowsAny <SocketException>(() => Dns.EndGetHostAddresses(Dns.BeginGetHostAddresses(InvalidHostName, null, null)));
});
Assert.DoesNotContain(events, e => e.EventId == 0); // errors from the EventSource itself
Assert.True(events.Count >= 3 * 6);
EventWrittenEventArgs[] starts = events.Where(e => e.EventName == "ResolutionStart").ToArray();
Assert.Equal(6, starts.Length);
Assert.All(starts, s => Assert.Equal(InvalidHostName, Assert.Single(s.Payload).ToString()));
EventWrittenEventArgs[] failures = events.Where(e => e.EventName == "ResolutionFailed").ToArray();
Assert.Equal(6, failures.Length);
EventWrittenEventArgs[] stops = events.Where(e => e.EventName == "ResolutionStop").ToArray();
Assert.Equal(6, stops.Length);
}).Dispose();
}
internal static void CheckConnection()
{
//We are already connected.
if ((connection != null && connection.ConnectionAlive()) || DateTime.UtcNow < punishmentReconnectTime || isConnecting)
{
return;
}
IPHostEntry hostEntry = null;
Dns.BeginGetHostEntry(Config.DNS_HOST_NAME == "localhost" ? string.Empty : Config.DNS_HOST_NAME, (callback) =>
{
isConnecting = true;
hostEntry = Dns.EndGetHostEntry(callback);
bool connected = false;
for (ushort i = 0; i < hostEntry.AddressList.Length; i++)
{
for (byte j = 0; j < Config.PORT_NUMBERS.Length; j++)
{
try
{
connection = TCPConnection.GetConnection(new ConnectionInfo(new IPEndPoint(hostEntry.AddressList[i], Config.PORT_NUMBERS[j])));
connected = true; //We use this to exit the outer loop
OnConnected();
break;
}
catch { }
}
if (connected)
{
break;
}
}
isConnecting = false;
}, null);
}
/// <summary>
/// 使用End方法名阻塞线程
/// </summary>
public static void BlockUntilOperationCompletes(IPAddress ip)
{
IAsyncResult result = Dns.BeginGetHostEntry(ip, null, null);
Console.WriteLine("APM End Thread id : {0}, processing request for information...", Thread.CurrentThread.ManagedThreadId);
try
{
//调用End方法阻塞线程
IPHostEntry host = Dns.EndGetHostEntry(result);
string[] aliases = host.Aliases;
IPAddress[] addresses = host.AddressList;
if (aliases.Length > 0)
{
Console.WriteLine("APM End Thread id : {0}, Aliases", Thread.CurrentThread.ManagedThreadId);
for (int i = 0; i < aliases.Length; i++)
{
Console.WriteLine("APM End Thread id : {0}, {1}", Thread.CurrentThread.ManagedThreadId, aliases[i]);
}
}
if (addresses.Length > 0)
{
Console.WriteLine("APM End Thread id : {0}, address", Thread.CurrentThread.ManagedThreadId);
for (int i = 0; i < addresses.Length; i++)
{
Console.WriteLine("APM End Thread id : {0}, {1}", Thread.CurrentThread.ManagedThreadId, addresses[i]);
}
}
}
catch (SocketException e)
{
Console.WriteLine("APM End Thread id : {0}, Exception occurred while processing the request: {1}",
Thread.CurrentThread.ManagedThreadId, e.Message);
}
}
public static int Main(string[] args)
{
AsyncCallback cback = new AsyncCallback(ResolveCallback);
IAsyncResult res = Dns.BeginGetHostEntry("localhost", cback, null);
System.Threading.Thread.Sleep(2000);
/*
* seems to be broken
* while (!res.IsCompleted) {
* System.Threading.Thread.Sleep(20);
* };
* IPHostEntry ip = Dns.EndGetHostEntry (res);
* Console.WriteLine (ip);*/
if (frame_count < 1)
{
return(1);
}
// A test for #444383
AppDomain.CreateDomain("1").CreateInstance(typeof(Class1).Assembly.GetName().Name, "Class1");
return(0);
}
public static void EventSource_GetHostEntryForIP_LogsStartStop()
{
RemoteExecutor.Invoke(async() =>
{
const string ValidIPAddress = "8.8.4.4";
using var listener = new TestEventListener("System.Net.NameResolution", EventLevel.Informational);
var events = new ConcurrentQueue <EventWrittenEventArgs>();
await listener.RunWithCallbackAsync(events.Enqueue, async() =>
{
IPAddress ipAddress = IPAddress.Parse(ValidIPAddress);
await Dns.GetHostEntryAsync(ValidIPAddress);
await Dns.GetHostEntryAsync(ipAddress);
Dns.GetHostEntry(ValidIPAddress);
Dns.GetHostEntry(ipAddress);
Dns.EndGetHostEntry(Dns.BeginGetHostEntry(ValidIPAddress, null, null));
Dns.EndGetHostEntry(Dns.BeginGetHostEntry(ipAddress, null, null));
});
Assert.DoesNotContain(events, e => e.EventId == 0); // errors from the EventSource itself
// Each GetHostEntry over an IP will yield 2 resolutions
EventWrittenEventArgs[] starts = events.Where(e => e.EventName == "ResolutionStart").ToArray();
Assert.Equal(12, starts.Length);
Assert.Equal(6, starts.Count(s => Assert.Single(s.Payload).ToString() == ValidIPAddress));
EventWrittenEventArgs[] stops = events.Where(e => e.EventName == "ResolutionStop").ToArray();
Assert.Equal(12, stops.Length);
Assert.DoesNotContain(events, e => e.EventName == "ResolutionFailed");
}).Dispose();
}
public void AsyncGetHostEntry(string host, Action <IPHostEntry> resultAction)
{
Logger.DEBUG(host);
try
{
IPAddress iPAddress = null;
if (IPAddress.TryParse(host, ref iPAddress))
{
IPHostEntry iPHostEntry = new IPHostEntry();
iPHostEntry.set_AddressList(new IPAddress[]
{
iPAddress
});
resultAction.Invoke(iPHostEntry);
}
else if (this.dnsCache.ContainsKey(host))
{
IPHostEntry iPHostEntry2 = this.dnsCache.get_Item(host);
resultAction.Invoke(iPHostEntry2);
}
else
{
Action <IAsyncResult> action = delegate(IAsyncResult ar)
{
try
{
string text = (string)ar.get_AsyncState();
Logger.DEBUG(text + " end");
IPHostEntry entry = Dns.EndGetHostEntry(ar);
Logger.DEBUG(text + " end, entry.AddressList.Length=" + entry.get_AddressList().Length.ToString());
Action <int, Dictionary <string, object> > action2 = delegate(int status, Dictionary <string, object> content)
{
string text2 = content.get_Item("host") as string;
IPHostEntry iPHostEntry3 = content.get_Item("entry") as IPHostEntry;
Action <IPHostEntry> action3 = content.get_Item("resultAction") as Action <IPHostEntry>;
this.dnsCache.set_Item(text2, entry);
action3.Invoke(entry);
};
Message message = new Message();
message.status = 0;
message.content.set_Item("host", text);
message.content.set_Item("entry", entry);
message.content.set_Item("resultAction", resultAction);
message.action = action2;
this.EnqueueDrive(message);
}
catch (Exception ex2)
{
Logger.ERROR(ex2.get_Message() + ":" + ex2.get_StackTrace());
}
};
Logger.DEBUG(host + " begin");
Dns.BeginGetHostEntry(host, new AsyncCallback(action.Invoke), host);
}
}
catch (Exception ex)
{
resultAction.Invoke(null);
Logger.ERROR(ex.get_Message() + ":" + ex.get_StackTrace());
}
}
private static void Main(string[] args)
{
if (string.Join(" ", args).Contains("logo"))
{
ConsoleUtil.ShowAppHeader(Assembly.GetExecutingAssembly());
}
var appInfo = new ApplicationInfo
{
AssemblyInfo = Assembly.GetExecutingAssembly(),
CommandlineArgumentInfos = GetArguments(),
ParameterDelimiter = '=',
ParameterPraefix = '-'
};
if (!AppUtil.AreCommandArgumentsValid(args, appInfo))
{
ConsoleUtil.PrintArgumentError(appInfo, string.Join("\n", AppUtil.CheckCommandArguments(args, appInfo).AsEnumerable()));
}
else
{
var list = AppUtil.MapCommandArguments(args, appInfo);
var result = 0;
string givenValue;
var ports = new List <int>();
string portValue;
int timeout;
int repeats;
bool autoStop;
bool useUdp;
bool detailledState;
try
{
givenValue = list.First(a => a.Abbreviation == "a").GivenValue;
portValue = list.First(a => a.Abbreviation == "p").GivenValue;
if (portValue.Contains(","))
{
portValue.Split(',').ToList().ForEach(p => ports.Add(int.Parse(p.Trim())));
}
else
{
if (portValue.Contains('-'))
{
var portsRanged = portValue.Split('-');
var from = int.Parse(portsRanged[0]);
var to = int.Parse(portsRanged[1]);
for (var p = from; p <= to; p++)
{
ports.Add(p);
}
}
else
{
ports.Add(int.Parse(portValue));
}
}
timeout = int.Parse(list.First(a => a.Abbreviation == "tim").ResolvedValue);
repeats = int.Parse(list.First(a => a.Abbreviation == "r").ResolvedValue);
autoStop = list.SingleOrDefault(a => a.Abbreviation == "as") != null;
useUdp = list.SingleOrDefault(a => a.Abbreviation == "u") != null;
detailledState = list.SingleOrDefault(a => a.Abbreviation == "d") != null;
if (list.SingleOrDefault(a => a.Abbreviation == "t") != null)
{
repeats = int.MaxValue;
}
var commandlineArgumentInfo = list.SingleOrDefault(a => a.Abbreviation == "w");
if (commandlineArgumentInfo != null)
{
int.TryParse(commandlineArgumentInfo.ResolvedValue, out result);
}
}
catch (Exception ex)
{
ConsoleUtil.WriteLine($"Error during parsing input parameters: {ex.Message}", ConsoleColor.Red);
return;
}
if (string.IsNullOrEmpty(givenValue) || ports.Any(p => p <= 0))
{
return;
}
Console.WriteLine(
"Starting pinging host {0} on {3} port(s) {1} {2} times:",
givenValue,
portValue,
repeats == int.MaxValue ? "infinite" : repeats.ToString(CultureInfo.InvariantCulture),
useUdp ? "UDP" : "TCP");
var reachablePorts = 0;
var closedPorts = 0;
var hostIp = "-";
if (list.FirstOrDefault(a => a.Abbreviation == "res") != null)
{
// we have to perform address resolution
Dns.BeginGetHostEntry(
givenValue,
ar =>
{
IPHostEntry local0 = null;
try
{
local0 = Dns.EndGetHostEntry(ar);
}
catch
{
// empty catch
}
if (local0 == null || !local0.AddressList.Any())
{
return;
}
hostIp = local0.AddressList[0].ToString();
},
null);
}
// start the process
var currentPack = 0;
for (var i = 0; i < repeats; ++i)
{
var portOpen = true;
ports.ForEach(
port =>
{
try
{
portOpen &= NetworkUtil.IsPortOpened(givenValue, port, timeout, useUdp);
reachablePorts += portOpen ? 1 : 0;
closedPorts += portOpen ? 0 : 1;
var printResult = portOpen ? "OPEN" : "CLOSED";
if (detailledState && !portOpen)
{
printResult += $" ({NetworkUtil.LastCheckResult.ToString()})";
}
Console.Write("#{0,4} -> Pinging host {1} (IP:{2}) on {5} port {3} with timeout {4}: ", ++currentPack, givenValue, hostIp, port, timeout, useUdp ? "UDP" : "TCP");
ConsoleUtil.WriteLine(printResult, portOpen ? ConsoleColor.DarkGreen : ConsoleColor.DarkRed);
}
catch (Exception ex)
{
ConsoleUtil.WriteLine($"#{++currentPack,4} Error pinging host {givenValue}: {ex.Message}", ConsoleColor.Red);
}
});
if (!autoStop || !portOpen)
{
if (result > 0)
{
Thread.Sleep(result);
}
}
else
{
break;
}
}
Console.WriteLine("Finished pinging host {0} (IP:{1}). {2} pings sent ({3} OPEN, {4} CLOSED)", givenValue, hostIp, currentPack, reachablePorts, closedPorts);
if (list.FirstOrDefault(a => a.Abbreviation == "elf") != null)
{
// return error level 1 if all pings where closed and 0 if any of them was open
Environment.Exit(reachablePorts > 0 ? 0 : 1);
}
if (list.FirstOrDefault(a => a.Abbreviation == "elsc") != null)
{
// return the amount of opened pings as the error level
Environment.Exit(reachablePorts);
}
}
}
// Token: 0x0600074B RID: 1867 RVA: 0x0003AA62 File Offset: 0x00038C62
public ZConnector2(string host, int port)
{
this.m_host = host;
this.m_port = port;
Dns.BeginGetHostEntry(host, new AsyncCallback(this.OnHostLookupDone), null);
}
/// <summary>
/// Resolve a host IP address to a host name
/// </summary>
/// <remarks>This first makes a DNS query and uses the result if found. If not found it then tries a Microsoft DNS call which also searches the local hosts and makes a netbios query.
/// If this returns an answer it is use. Otherwise the IP address is returned as the host name</remarks>
private void ResolveIpAddressToHostName(object deviceIpEndPointObject)
{
IPEndPoint deviceIpEndPoint = null;
try
{
deviceIpEndPoint = deviceIpEndPointObject as IPEndPoint; // Get the supplied device endpoint as an IPEndPoint
// test whether the cast was successful
if (deviceIpEndPoint is object) // The cast was successful so we can try to search for the host name
{
var dnsResponse = new DnsResponse(); // Create a new DnsResponse to hold and return the
// Calculate the remaining time before this discovery needs to finish and only undertake DNS resolution if sufficient time remains
var timeOutTime = TimeSpan.FromSeconds(discoveryTime).Subtract(DateTime.Now - discoveryStartTime).Subtract(TimeSpan.FromSeconds(0.2d));
if (timeOutTime.TotalSeconds > Constants.MINIMUM_TIME_REMAINING_TO_UNDERTAKE_DNS_RESOLUTION) // We have more than the configured time left so we will attempt a reverse DNS name resolution
{
LogMessage("ResolveIpAddressToHostName", $"Resolving IP address: {deviceIpEndPoint.Address}, Timeout: {timeOutTime}");
Dns.BeginGetHostEntry(deviceIpEndPoint.Address.ToString(), new AsyncCallback(GetHostEntryCallback), dnsResponse);
// Wait here until the resolve completes and the callback calls .Set()
bool dnsWasResolved = dnsResponse.CallComplete.WaitOne(timeOutTime); // Wait for the remaining discovery time
// Execution continues here after either a DNS response is found or the request times out
if (dnsWasResolved) // A response was received rather than timing out
{
LogMessage("ResolveIpAddressToHostName", $"{deviceIpEndPoint} has host name: {dnsResponse.HostName} IP address count: {dnsResponse.AddressList.Length} Alias count: {dnsResponse.Aliases.Length}");
foreach (IPAddress address in dnsResponse.AddressList)
{
LogMessage("ResolveIpAddressToHostName", $" Received {address.AddressFamily} address: {address}");
}
foreach (string hostAlias in dnsResponse.Aliases)
{
LogMessage("ResolveIpAddressToHostName", $" Received alias: {hostAlias}");
}
if (dnsResponse.AddressList.Length > 0) // We got a reply that contains host addresses so there may be a valid host name
{
lock (deviceListLockObject)
{
if (!string.IsNullOrEmpty(dnsResponse.HostName))
{
alpacaDeviceList[deviceIpEndPoint].HostName = dnsResponse.HostName;
}
}
RaiseAnAlpacaDevicesChangedEvent(); // Device list was changed so set the changed flag
}
else
{
LogMessage("ResolveIpAddressToHostName", $"***** DNS responded with a name ({dnsResponse.HostName}) but this has no associated IP addresses and is probably a NETBIOS name *****");
}
foreach (IPAddress address in dnsResponse.AddressList)
{
LogMessage("ResolveIpAddressToHostName", $"Address: {address}");
}
foreach (string alias in dnsResponse.Aliases)
{
LogMessage("ResolveIpAddressToHostName", $"Alias: {alias}");
}
}
else // DNS did not respond in time
{
LogMessage("ResolveIpAddressToHostName", $"***** DNS did not respond within timeout - unable to resolve IP address to host name *****");
}
}
else // There was insufficient time to query DNS
{
LogMessage("ResolveIpAddressToHostName", $"***** Insufficient time remains ({timeOutTime.TotalSeconds} seconds) to conduct a DNS query, ignoring request *****");
}
}
else // The IPEndPoint cast was not successful so we cannot carry out a DNS name search because we don't have the device's IP address
{
LogMessage("ResolveIpAddressToHostName", $"DNS resolution could not be undertaken - It was not possible to cast the supplied IPEndPoint object to an IPEndPoint type: {deviceIpEndPoint}.");
}
}
catch (TimeoutException)
{
LogMessage("ResolveIpAddressToHostName", $"Timed out trying to resolve the DNS name for {(deviceIpEndPoint is null ? "Unknown IP address" : deviceIpEndPoint.ToString()) }");
}
catch (Exception ex)
{
// Something went wrong, so log the issue and sent a message to the user
LogMessage("ResolveIpAddressToHostName", $"Exception: {ex}");
}
}
static void Main(string[] args)
{
// Make sure the caller supplied a host name.
if (args.Length == 0 || args[0].Length == 0)
{
// Print a message and exit.
Console.WriteLine("You must specify the name of a host computer.");
return;
}
// Start the asynchronous request for DNS information.
IAsyncResult result = Dns.BeginGetHostEntry(args[0], null, null);
Console.WriteLine("Processing request for information...");
// Wait until the operation completes.
result.AsyncWaitHandle.WaitOne();
// The operation completed. Process the results.
try
{
// Get the results.
IPHostEntry host = Dns.EndGetHostEntry(result);
string[] aliases = host.Aliases;
IPAddress[] addresses = host.AddressList;
if (aliases.Length > 0)
{
Console.WriteLine("Aliases");
for (int i = 0; i < aliases.Length; i++)
{
Console.WriteLine("{0}", aliases[i]);
}
}
if (addresses.Length > 0)
{
Console.WriteLine("Addresses");
for (int i = 0; i < addresses.Length; i++)
{
Console.WriteLine("{0}", addresses[i].ToString());
}
}
}
catch (SocketException e)
{
Console.WriteLine("Exception occurred while processing the request: {0}",
e.Message);
}
Console.ReadLine();
// Linq
LinqExample ex = new LinqExample();
//ex.LinqConsole();
student_a entity1 = new student_a();
#region 字段属性，抽象方法，虚方法
//entity1.Test(); // 普通方法
//entity1.Abstract_Test(); // 抽象方法
//entity1.Abstract_Test1(); // 抽象方法
//entity1.Virtual_Test();// 虚方法
//entity1.Virtual_Test1();// 重写虚方法
// entity1.Name = "北京欢迎你";
// Console.WriteLine(entity1.Name);
//entity1.setAge(11);
//Console.WriteLine(entity1.getAge().ToString());
#endregion
#region 委托
//delegate_test dt = new delegate_test();
//dt.main();
#endregion
#region 泛型
#region ArrayList
//System.Collections.ArrayList list = new System.Collections.ArrayList();
//// Add an integer to the list.
//list.Add(3);
//// Add a string to the list. This will compile, but may cause an error later.
//list.Add("It is raining in Redmond.");
//int t = 0;
//// This causes an InvalidCastException to be returned.
//foreach (int x in list)
//{
// t += x;
//}
//List<int> listtt = new List<int> {1,2,3,4,5 };
#endregion
#region 参数委托约束
if (1 > 3)
{
var map = Test2.EnumNameValues <RainBow>();
foreach (var pair in map)
{
Console.WriteLine($"{pair.Key}:\t{pair.Value}");
}
}
#endregion
#region 泛型接口
if (1 > 3)
{
//Person is the type argument.
SortedList <Person> list = new SortedList <Person>();
//Create name and age values to initialize Person objects.
string[] names = new string[] { "a", "b", "c" };
int[] ages = new int[] { 1, 2, 3 };
//Populate the list.
for (int x = 0; x < 3; x++)
{
list.AddHead(new Person(names[x], ages[x]));
}
//Print out unsorted list.
foreach (Person p in list)
{
System.Console.WriteLine(p.ToString());
}
System.Console.WriteLine("Done with unsorted list");
//Sort the list.
list.BubbleSort();
//Print out sorted list.
foreach (Person p in list)
{
System.Console.WriteLine(p.ToString());
}
System.Console.WriteLine("Done with sorted list");
}
#endregion
#endregion
#region 元组
if (1 > 3)
{
var ToString = "This is some text";
var one = 1;
var Item1 = 5;
var projections = (ToString, one, Item1);
// Accessing the first field:
Console.WriteLine(projections.Item1);
//Console.WriteLine(projections.ToStrings);
// There is no semantic name 'ToString'
// Accessing the second field:
Console.WriteLine(projections.one);
Console.WriteLine(projections.Item2);
// Accessing the third field:
Console.WriteLine(projections.Item3);
// There is no semantic name 'Item`.
var pt1 = (X : 3, Y : 0);
var pt2 = (X : 3, Y : 4);
var xCoords = (pt1.X, pt2.X);
// There are no semantic names for the fields
// of xCoords.
// Accessing the first field:
Console.WriteLine(xCoords.Item1);
// Accessing the second field:
Console.WriteLine(xCoords.Item2);
}
if (1 > 3)
{
// The 'arity' and 'shape' of all these tuples are compatible.
// The only difference is the field names being used.
var unnamed = (42, "The meaning of life");
var anonymous = (16, "a perfect square");
var named = (Answer : 42, Message : "The meaning of life");
var differentNamed = (SecretConstant : 42, Label : "The meaning of life 123456");
unnamed = named;
// Console.WriteLine($"{unnamed.Item1}, {unnamed.Message}");
named = unnamed;
// 'named' still has fields that can be referred to
// as 'answer', and 'message':
Console.WriteLine($"{named.Answer}, {named.Message}");
// unnamed to unnamed:
anonymous = unnamed;
// named tuples.
named = differentNamed;
// The field names are not assigned. 'named' still has
// fields that can be referred to as 'answer' and 'message':
Console.WriteLine($"{named.Answer}, {named.Message}");
(long, string)conversion = named;
Console.WriteLine($"{conversion.Item1}, {conversion.Item2}");
}
#endregion
#region 运算符
if (1 > 3)
{
string[] arrNum = { "zero", "one", "two", "three", "four", "five", "six", "seven" };
var shortDig = arrNum.Where((a, index) => a.Length < index);
foreach (var sd in shortDig)
{
Console.WriteLine(sd);
}
}
#endregion
#region 迭代器
if (1 > 3)
{
DaysOfTheWeek week = new DaysOfTheWeek();
foreach (string day in week)
{
Console.WriteLine(day + " _ ");
}
}
#endregion
Console.ReadLine();
}
static internal IAsyncResult BeginGetHostByName(string hostName, AsyncCallback cb, object state)
{
return(Dns.BeginGetHostEntry(hostName, cb, state));
}
public bool LookupHostName(IPAddress remoteAddress, object target, Action <object, string, NameSources> setter)
{
if (remoteAddress.Equals(IPAddress.Any) || remoteAddress.Equals(IPAddress.IPv6Any))
{
return(true);
}
if (remoteAddress.Equals(IPAddress.Loopback) || remoteAddress.Equals(IPAddress.IPv6Loopback))
{
return(true);
}
ReverseDnsEntry Entry = null;
if (ReverseDnsCache.TryGetValue(remoteAddress, out Entry))
{
if ((Entry.TimeStamp + (5 * 60 * 1000) >= MiscFunc.GetCurTick()))
{
if (Entry.HostName != null)
{
setter(target, Entry.HostName, NameSources.ReverseDNS);
}
return(true);
}
}
if (Entry == null)
{
Entry = new ReverseDnsEntry();
ReverseDnsCache.Add(remoteAddress, Entry);
}
if (Entry.PendingJobs == null)
{
Entry.PendingJobs = new List <HostLookupJob>();
//AppLog.Debug("reverse looking up : {0}", remoteAddress.ToString());
// todo: use matibe api to save oin dns queries
Dns.BeginGetHostEntry(remoteAddress, (x) =>
{
// WARNING: this function is called from the worker thread
//x.AsyncState
IPHostEntry hostInfo = null;
try
{
hostInfo = Dns.EndGetHostEntry(x);
}
catch { }
App.engine?.RunInEngineThread(() =>
{
// Note: this happens in the engine thread
Entry.TimeStamp = MiscFunc.GetCurTick();
if (hostInfo != null)
{
Entry.HostName = hostInfo.HostName;
}
if (Entry.HostName != null)
{
foreach (var job in Entry.PendingJobs)
{
job.SetHostName(Entry.HostName, NameSources.ReverseDNS);
}
}
Entry.PendingJobs = null;
});
}, null);
}
Entry.PendingJobs.Add(new HostLookupJob()
{
target = new WeakReference(target), setter = setter
});
return(false);
}
private void CallbackOnNewPC(PC pc)
{
object[] objArray = new object[] { pc };
Invoke(new delegateOnNewPC(AddPc), objArray);
Dns.BeginGetHostEntry(pc.ip.ToString(), new AsyncCallback(this.EndResolvCallBack), pc);
}
protected void ProcessPendingClients()
{
PendingClient[] clients = null;
lock (PendingClients)
clients = PendingClients.ToArray();
while (clients.Length > 0)
{
foreach (PendingClient c in clients)
{
if (!c.DNSStarted)
{
var address = ((IPEndPoint)c.ClientConnection.Client.RemoteEndPoint).Address.ToString();
Logger.Log3("DNS Lookup started for " + address);
Dns.BeginGetHostEntry(address, DNSLookupCompleted, c);
c.DNSStarted = true;
}
else if (!c.DNSPassed)
{
if (c.HostEntry != null)
{
Logger.Log3("Ban check started for " + c.HostEntry.HostName);
// lookup the host in the ban list
bool ban = false;
string reason = string.Empty;
if (CheckHostBan != null)
{
ban = CheckHostBan(c, ref reason);
}
if (!ban)
{
c.DNSPassed = true;
}
else
{
c.HostEntry = null;
DisconnectPendingClient(c);
}
}
}
if (!c.Active)
{
continue;
}
int available = c.ClientConnection.Available;
if (c.ClientConnection.Available > 0)
{
if (!c.ProtcolPassed && c.ClientConnection.Available >= Protocol.BZFSHail.Length)
{
c.DataRecieved = true;
byte[] buffer = new byte[Protocol.BZFSHail.Length];
int read = c.NetStream.Read(buffer, 0, buffer.Length);
if (read != buffer.Length)
{
c.ProtcolPassed = false;
DisconnectPendingClient(c);
Logger.Log4("Disconnecting abnormal connection from " + c.ClientConnection.Client.RemoteEndPoint.ToString());
}
else
{
if (Encoding.ASCII.GetString(buffer) == Protocol.BZFSHailString)
{
c.ProtcolPassed = true;
c.NetStream.Write(Protocol.DefaultBZFSVersion, 0, Protocol.DefaultBZFSVersion.Length);
c.NetStream.Flush();
c.VersionPassed = true;
Logger.Log4("BZFS header from " + c.ClientConnection.Client.RemoteEndPoint.ToString());
}
}
}
}
if (c.Active)
{
if (c.DNSStarted && c.DNSPassed && c.DataRecieved && c.ProtcolPassed && c.VersionPassed)
{
RemovePendingClient(c);
Logger.Log4("Accepted BZFS connection from " + c.ClientConnection.Client.RemoteEndPoint.ToString());
// send them off to the next step
if (BZFSProtocolConnectionAccepted != null)
{
BZFSProtocolConnectionAccepted.Invoke(this, c);
}
}
}
}
Thread.Sleep(100);
lock (PendingClients)
clients = PendingClients.ToArray();
}
WorkerThread = null;
}
public static void Main()
{
// Create the delegate that will process the results of the
// asynchronous request.
AsyncCallback callBack = new AsyncCallback(ProcessDnsInformation);
string host;
do
{
Console.Write(" Enter the name of a host computer or <enter> to finish: ");
host = Console.ReadLine();
if (host.Length > 0)
{
// Increment the request counter in a thread safe manner.
Interlocked.Increment(ref requestCounter);
// Create and store the state object for this request.
HostRequest request = new HostRequest(host);
hostData.Add(request);
// Start the asynchronous request for DNS information.
Dns.BeginGetHostEntry(host, callBack, request);
}
} while (host.Length > 0);
// The user has entered all of the host names for lookup.
// Now wait until the threads complete.
while (requestCounter > 0)
{
UpdateUserInterface();
}
// Display the results.
foreach (HostRequest r in hostData)
{
if (r.ExceptionObject != null)
{
Console.WriteLine("Request for host {0} returned the following error: {1}.",
r.HostName, r.ExceptionObject.Message);
}
else
{
// Get the results.
IPHostEntry h = r.HostEntry;
string[] aliases = h.Aliases;
IPAddress[] addresses = h.AddressList;
if (aliases.Length > 0)
{
Console.WriteLine("Aliases for {0}", r.HostName);
for (int j = 0; j < aliases.Length; j++)
{
Console.WriteLine("{0}", aliases[j]);
}
}
if (addresses.Length > 0)
{
Console.WriteLine("Addresses for {0}", r.HostName);
for (int k = 0; k < addresses.Length; k++)
{
Console.WriteLine("{0}", addresses[k].ToString());
}
}
}
}
}
/// <summary>
/// Internal representation of the job logic.
/// </summary>
private async Task Run()
{
var runs = 0;
var shouldRun = true;
var overallWatch = new Stopwatch();
var portWatch = new Stopwatch();
overallWatch.Start();
while (!_tokenSource.IsCancellationRequested && shouldRun)
{
runs++;
State = JobStateEnum.Running;
JobDefinition.TargetPorts.ToList().ForEach(
port =>
{
try
{
var runResult = new JobSingleRunModel
{
Tcp = JobDefinition.Tcp,
Udp = JobDefinition.Udp,
Port = port
};
portWatch.Restart();
runResult.PortReached = NetworkUtil.IsPortOpened(JobDefinition.TargetAddess, port, (int)JobDefinition.Timeout.TotalSeconds, JobDefinition.Udp);
portWatch.Stop();
runResult.Duration = portWatch.Elapsed;
if (JobDefinition.ResolveAddress)
{
// job should try to resolve ip address
Dns.BeginGetHostEntry(
JobDefinition.TargetAddess,
ar =>
{
IPHostEntry firstNetworkAddress = null;
try
{
firstNetworkAddress = Dns.EndGetHostEntry(ar);
}
catch
{
// empty catch
}
if (firstNetworkAddress == null || !firstNetworkAddress.AddressList.Any())
{
return;
}
runResult.ResolvedAddress = firstNetworkAddress.AddressList[0].ToString();
},
null);
}
DispatcherHelper.BeginInvoke(() => Result.Runs.Add(runResult));
ResultReceived?.Invoke(this, new JobResultEventArgs(runResult));
if (runResult.PortReached && JobDefinition.AutoStop)
{
// the port is reached and autostop is on
shouldRun = false;
return;
}
if (JobDefinition.MaxTries.HasValue && JobDefinition.MaxTries.Value <= runs)
{
// the maximum amount of tries is reached
shouldRun = false;
return;
}
if (JobDefinition.MaxRuntime.HasValue && JobDefinition.MaxRuntime.Value <= overallWatch.Elapsed)
{
// maximum runtime is reached
shouldRun = false;
return;
}
// inform callers that there is a new result
// ReSharper disable once ExplicitCallerInfoArgument
OnPropertyChanged(nameof(Result));
}
catch (Exception ex)
{
// TODO
}
});
State = JobStateEnum.Waiting;
await Task.Delay(JobDefinition.WaitTime, CancellationToken.None);
}
overallWatch.Stop();
}
/// <summary>
/// Initializes the <see cref="LilaPing"/> class.
/// </summary>
static LilaPing()
{
Dns.BeginGetHostEntry("socket.lichess.org", OnInitComplete, null);
}
public static void DNSConnect(string hostName, string PORT_NO)
{
Dns.BeginGetHostEntry(hostName, GetHostEntryCallback, PORT_NO);
}
public void DnsBeginGetHostEntry_BadIpString_Throws()
{
IAsyncResult asyncObject = Dns.BeginGetHostEntry("0.0.1.1", null, null);
Assert.ThrowsAny <SocketException>(() => Dns.EndGetHostEntry(asyncObject));
}
public static void Main()
{
// Create the delegate that will process the results of the
// asynchronous request.
AsyncCallback callBack = new AsyncCallback(ProcessDnsInformation);
string host;
do
{
Console.Write(" Enter the name of a host computer or <enter> to finish: ");
host = Console.ReadLine();
if (host.Length > 0)
{
// Increment the request counter in a thread safe manner.
Interlocked.Increment(ref requestCounter);
// Start the asynchronous request for DNS information.
Dns.BeginGetHostEntry(host, callBack, host);
}
} while (host.Length > 0);
// The user has entered all of the host names for lookup.
// Now wait until the threads complete.
while (requestCounter > 0)
{
UpdateUserInterface();
}
// Display the results.
for (int i = 0; i < hostNames.Count; i++)
{
object data = hostData[i];
string message = data as string;
// A SocketException was thrown.
if (message != null)
{
Console.WriteLine("Request for {0} returned message: {1}",
hostNames[i], message);
continue;
}
// Get the results.
IPHostEntry h = (IPHostEntry)data;
string[] aliases = h.Aliases;
IPAddress[] addresses = h.AddressList;
if (aliases.Length > 0)
{
Console.WriteLine("Aliases for {0}", hostNames[i]);
for (int j = 0; j < aliases.Length; j++)
{
Console.WriteLine("{0}", aliases[j]);
}
}
if (addresses.Length > 0)
{
Console.WriteLine("Addresses for {0}", hostNames[i]);
for (int k = 0; k < addresses.Length; k++)
{
Console.WriteLine("{0}", addresses[k].ToString());
}
}
}
Console.ReadLine();
}
public void Start()
{
Dns.BeginGetHostEntry("www.google.com", new AsyncCallback(Stop), "Lookin up Google");
}
//Single thread
private void handshakeReceiveCallback(IAsyncResult ar)
{
//this check is moved to except
//try
//{
// //already recycle
// lock (this)
// {
// if (closed)
// return;
// }
//}
//catch (Exception)
//{
// return;
//}
try
{
int bytesRead = connection.EndReceive(ar);
if (bytesRead == 0)
{
throw new Exception("Error When handshakeReceiveCallback");
}
//Console.WriteLine("bytesRead" + bytesRead.ToString() + " stage" + stage.ToString());
if (stage == 0)
{
//recv numbers of ivlen data
byte[] iv = encryptor.Decrypt(this.connetionBuffer, bytesRead);
//Decrypt sucessful
//iv
stage = 1;
connection.BeginReceive(this.connetionBuffer, 0, 1, 0,
new AsyncCallback(handshakeReceiveCallback), null);
}
else if (stage == 1)
{
byte[] buff = encryptor.Decrypt(this.connetionBuffer, bytesRead);
//Decrypt sucessful
//addrtype
char addrtype = (char)buff[0];
if (addrtype == 1)
{
//type of ipv4
stage = 4;
connection.BeginReceive(this.connetionBuffer, 0, 4, 0,
new AsyncCallback(handshakeReceiveCallback), addrtype);
}
else if (addrtype == 3)
{
//type of url
stage = 3;
connection.BeginReceive(this.connetionBuffer, 0, 1, 0,
new AsyncCallback(handshakeReceiveCallback), addrtype);
}
else if (addrtype == 4)
{
//type of ipv6
stage = 4;
connection.BeginReceive(this.connetionBuffer, 0, 16, 0,
new AsyncCallback(handshakeReceiveCallback), addrtype);
}
else
{
throw new Exception("Error Socket5 AddrType");
}
}
else if (stage == 3)
{
//addr len
byte[] buff = encryptor.Decrypt(this.connetionBuffer, bytesRead);
stage = 4;
//recv addr
connection.BeginReceive(this.connetionBuffer, 0, buff[0], 0,
new AsyncCallback(handshakeReceiveCallback), ar.AsyncState);
}
else if (stage == 4)
{
//addr
byte[] buff = encryptor.Decrypt(this.connetionBuffer, bytesRead);
if (1 == (char)ar.AsyncState)
{
//ipv4
destAddr = string.Format("{0:D}.{1:D}.{2:D}.{3:D}", buff[0], buff[1], buff[2], buff[3]);
}
else if (3 == (char)ar.AsyncState)
{
//ipv6 url
destAddr = ASCIIEncoding.Default.GetString(buff);
}
else
{
//url
destAddr = string.Format("[{0:x2}{1:x2}:{2:x2}{3:x2}:{4:x2}{5:x2}:{6:x2}{7:x2}:{8:x2}{9:x2}:{10:x2}{11:x2}:{12:x2}{13:x2}:{14:x2}{15:x2}]"
, buff[0], buff[1], buff[2], buff[3], buff[4], buff[5], buff[6], buff[7], buff[8], buff[9], buff[10], buff[11], buff[12], buff[13], buff[14], buff[15]);
}
stage = 5;
//recv port
connection.BeginReceive(this.connetionBuffer, 0, 2, 0,
new AsyncCallback(handshakeReceiveCallback), null);
}
else if (stage == 5)
{
//port
byte[] buff = encryptor.Decrypt(this.connetionBuffer, bytesRead);
int port = (int)(buff[0] << 8) + (int)buff[1];
stage = 6;
//handshake completed
lock (timeOutTimer)
{
this.timeOutTimer.Dispose();
timeOutTimer = null;
}
//Begin to connect remote
IPAddress ipAddress;
bool parsed = IPAddress.TryParse(destAddr, out ipAddress);
if (!parsed)
{
IPAddress cache_ipAddress = DNSCache.GetInstence().Get(destAddr);
if (cache_ipAddress == null)
{
DNSCbContext ct = new DNSCbContext(destAddr, port);
Dns.BeginGetHostEntry(destAddr, new AsyncCallback(GetHostEntryCallback), ct);
return;
}
ipAddress = cache_ipAddress;
}
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
remote = new Socket(ipAddress.AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
remote.BeginConnect(remoteEP,
new AsyncCallback(remoteConnectCallback), null);
}
}
catch (Exception e)
{
try
{
//handshake time out
lock (timeOutTimer)
{
if (timeOutTimer != null)
{
this.timeOutTimer.Dispose();
}
timeOutTimer = null;
}
Console.WriteLine(e.ToString());
this.Close();
}
catch (Exception)
{
//already recycle
}
}
}
private void OnStateChanged()
{
if (this.State == IrcSessionState.Connected && _findExternalAddress)
{
this.AddHandler(new IrcCodeHandler((e) =>
{
e.Handled = true;
if (e.Message.Parameters.Count < 2)
{
return(true);
}
var parts = e.Message.Parameters[1].Split('@');
if (parts.Length > 0)
{
IPAddress external;
if (!IPAddress.TryParse(parts[1], out external))
{
Dns.BeginGetHostEntry(parts[1], (ar) =>
{
try
{
var host = Dns.EndGetHostEntry(ar);
if (host.AddressList.Length > 0)
{
this.ExternalAddress = host.AddressList[0];
}
}
catch { }
}, null);
}
else
{
this.ExternalAddress = external;
}
}
return(true);
}, IrcCode.RPL_USERHOST));
this.UserHost(this.Nickname);
}
this.RaiseEvent(this.StateChanged, EventArgs.Empty);
if (this.State == IrcSessionState.Disconnected && this.AutoReconnect)
{
if (_reconnectTimer != null)
{
_reconnectTimer.Dispose();
}
_reconnectTimer = new Timer(new TimerCallback((obj) =>
{
if (_syncContext != null)
{
_syncContext.Post((o) => ((Action)o)(), (Action)this.OnReconnect);
}
else
{
this.OnReconnect();
}
}), null, ReconnectWaitTime, System.Threading.Timeout.Infinite);
}
}
public static void Main()
{
// 針對非同步請求，產生委派方法，用於處理非同步工作執行完成後的結果
AsyncCallback callBack = new AsyncCallback(ProcessDnsInformation);
string host;
// 在這個迴圈內，我們可以輸入多個 URL，程式會立即啟動非同步工作取得該 URL 的內容
do
{
Console.Write(" 請輸入主機名稱，或直接按下 <enter> 按鈕表示完成所有輸入作業: ");
host = Console.ReadLine();
if (host.Length > 0)
{
// 使用安全執行緒技巧，增加執行緒要使用的共用變數 [requestCounter] 的值，確保不會因為競賽，導致該變數的內容走味
//＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
// 遞增特定變數並將結果儲存起來，成為不可部分完成的作業。
// 在進行多執行緒存取分享資源的時候，尤其要特別注意
//＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
Interlocked.Increment(ref requestCounter);
Console.WriteLine("正在取得與處理DNS的資訊...");
// 呼叫 BeginXXX 啟動非同步工作
Dns.BeginGetHostEntry(host, callBack, host);
}
} while (host.Length > 0);
//＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
// 每次非同步作業完成後， requestCounter的就會減少一，由此判斷所有的非同步作業是否都已經完成
// 這樣的迴圈，也會造成系統資訊濫用
//＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
// 該迴圈的用意，僅是當所有非同步工作都處理完成之後，才會繼續執行該迴圈後的程式碼，
// 也就是列出所有非同步執行結果的內容
// 即
// 若有任何一個非同步工作尚未完成的話，程式會一直在該迴圈內跑
while (requestCounter > 0)
{
UpdateUserInterface();
}
// 若程式已經可以執行到這裡，那就表示所有非同步工作已經完成了
for (int i = 0; i < hostNames.Count; i++)
{
object data = hostData[i];
string message = data as string;
// 一個 SocketException 已經產生了
if (message != null)
{
Console.WriteLine("{0} 請求的傳回訊息: {1}",
hostNames[i], message);
continue;
}
IPHostEntry h = (IPHostEntry)data;
string[] aliases = h.Aliases;
IPAddress[] addresses = h.AddressList;
if (aliases.Length > 0)
{
Console.WriteLine("別名 {0}", hostNames[i]);
for (int j = 0; j < aliases.Length; j++)
{
Console.WriteLine("{0}", aliases[j]);
}
}
if (addresses.Length > 0)
{
Console.WriteLine("位址 {0}", hostNames[i]);
for (int k = 0; k < addresses.Length; k++)
{
Console.WriteLine("{0}", addresses[k].ToString());
}
}
}
Console.WriteLine("Press any key for continuing...");
Console.ReadKey();
}
/// <summary>
/// Get IPv4 address from notation (xxx.xxx.xxx.xxx) or hostname (asynchronous version)
/// </summary>
public static void ResolveAsync(string ipOrHost, ResolveAddressCallback callback)
{
if (string.IsNullOrEmpty(ipOrHost))
{
throw new ArgumentException("Supplied string must not be empty", "ipOrHost");
}
ipOrHost = ipOrHost.Trim();
NetAddress ipAddress = null;
if (NetAddress.TryParse(ipOrHost, out ipAddress))
{
if (ipAddress.AddressFamily == AddressFamily.InterNetwork || ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
callback(ipAddress);
return;
}
throw new ArgumentException("This method will not currently resolve other than ipv4 addresses");
}
// ok must be a host name
IPHostEntry entry;
try
{
Dns.BeginGetHostEntry(ipOrHost, delegate(IAsyncResult result)
{
try
{
entry = Dns.EndGetHostEntry(result);
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.HostNotFound)
{
//LogWrite(string.Format(CultureInfo.InvariantCulture, "Failed to resolve host '{0}'.", ipOrHost));
callback(null);
return;
}
else
{
throw;
}
}
if (entry == null)
{
callback(null);
return;
}
// check each entry for a valid IP address
foreach (var ipCurrent in entry.AddressList)
{
if (ipCurrent.AddressFamily == AddressFamily.InterNetwork || ipCurrent.AddressFamily == AddressFamily.InterNetworkV6)
{
callback(ipCurrent);
return;
}
}
callback(null);
}, null);
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.HostNotFound)
{
//LogWrite(string.Format(CultureInfo.InvariantCulture, "Failed to resolve host '{0}'.", ipOrHost));
callback(null);
}
else
{
throw;
}
}
}
public void Dns_BeginGetHostEntry_IPAddress_CallSocketInit_Ok()
{
NameResolutionPal.FakesReset();
Assert.ThrowsAny <Exception>(() => Dns.BeginGetHostEntry((IPAddress)null, null, null));
Assert.NotEqual(0, NameResolutionPal.FakesEnsureSocketsAreInitializedCallCount);
}
void BeginGetHostEntry(string host)
{
SetStage(Stage.GettingHostEntry);
Dns.BeginGetHostEntry(host, new AsyncCallback(HandleBeginGetHostEntry), null);
}
public static IAsyncResult BeginGetHostEntry(string hostNameOrAddress, AsyncCallback requestCallback, object stateObject)
{
var asyncResult = Dns.BeginGetHostEntry(hostNameOrAddress, requestCallback, stateObject);
return(asyncResult);
}