public static void Main()
{
string fileName = @"mytest.txt";
try
{
// Delete the file if it exists.
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write("\n\n Create a file with content in the disk :\n");
Console.Write("---------------------------------------------\n");
// Create the file.
using (StreamWriter fileStr = File.CreateText(fileName))
{
fileStr.WriteLine(" Hello and Welcome");
fileStr.WriteLine(" It is the first content");
fileStr.WriteLine(" of the text file mytest.txt");
Console.WriteLine(" A file created with content name mytest.txt\n\n");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
static void Main(string[] args)
{
string fileName = "myArrayTest.txt";
try
{
Console.Write("\n\n Create a file named {0} in the disk :\n", fileName);
Console.Write("------------------------------------------------\n");
// Create the file.
using (var fileStr = File.AppendText(fileName))
{
Console.WriteLine(" A file created with name {0}\n\n", fileName);
int[] numbers = new int[] { 8, 14, 54, 23, 11 };
fileStr.WriteLine("Array of numbers: \n");
foreach (int number in numbers)
{
fileStr.WriteLine(number);
}
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
Console.ReadLine();
}
static void Main()
{
string fileName = @"test.txt";
try
{
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.WriteLine("Append some text to an existing file");
Console.WriteLine(" ");
//Create a file
using (StreamWriter fileStr = File.CreateText(fileName))
{
fileStr.WriteLine("Hello!");
fileStr.WriteLine("How was your day?");
}
using (StreamReader sr = File.OpenText(fileName))
{
string s = "";
Console.WriteLine("Here is the content of your file: ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine();
}
using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"mytest.txt", true))
{
file.WriteLine(" This is the line append at last line.");
}
using (StreamReader sr = File.OpenText(fileName))
{
string s = "";
Console.WriteLine("Here is the content of the file after appending the text: ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine();
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
Console.ReadKey();
}
public static void Main()
{
var fileName = @"mytest.txt";
try
{
// Delete the file if it exists.
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write("\n\n Append some text to an existing file :\n");
Console.Write("--------------------------------------------\n");
// Create the file.
using (var fileStr = File.CreateText(fileName))
{
fileStr.WriteLine(" Hello and Welcome");
fileStr.WriteLine(" It is the first content");
fileStr.WriteLine(" of the text file mytest.txt");
}
using (var sr = File.OpenText(fileName))
{
var s = "";
Console.WriteLine(" Here is the content of the file mytest.txt : ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine("");
}
using (var file = new StreamWriter(@"mytest.txt", true))
{
file.WriteLine(" This is the line appended at last line.");
}
using (var sr = File.OpenText(fileName))
{
var s = "";
Console.WriteLine(" Here is the content of the file after appending the text : ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine("");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
static void Main(string[] args)
{
///create a string variable to store the file
string fileName = @"myTest.txt";
//Check if the file is exists, if yes then delete it.
try
{
if (File.Exists(fileName))
{
File.Delete(fileName);
}
//Display a message about what the program is doing
Console.WriteLine("\n\nRead the first line from the file: \n");
Console.WriteLine("-------------------------------------------");
//Create the file by creating an instance of StreamWriter class and use WriteLine method in order to write 3 lines.
using (StreamWriter filestr = File.CreateText(fileName))
{
filestr.WriteLine(" test line 1");
filestr.WriteLine(" test line 2");
filestr.WriteLine(" test line 3");
}
//Create an instance of StreamReader to read from a file
//The using statment also closes the StreamReader.
using (StreamReader sr = File.OpenText(fileName))
{//Read and display content from the file untill
//the end of the file is reached.
string s = " ";
Console.WriteLine("Here is the content of the file mytest.txt: ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine(" ");
}
//If the file exists read all the lines but display only the first line.
Console.Write("\n the content of the first line is: \n");
if (File.Exists(fileName))
{
string[] lines = File.ReadAllLines(fileName);
Console.Write(lines[0]);
}
Console.WriteLine();
}
//
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
static void Main()
{
string fileName = @"mytest.txt";
int count;
try
{
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.WriteLine("Conter of lines in file.");
Console.WriteLine("");
//Create the file
using (StreamWriter str = File.CreateText(fileName))
{
str.WriteLine("This is first line.");
str.WriteLine("This is second line.");
str.WriteLine("This is third line.");
str.WriteLine("This is fourth line.");
str.WriteLine("This is fifth line.");
}
using (StreamReader openFile = File.OpenText(fileName))
{
string s = "";
count = 0;
Console.WriteLine("The sum of lines in the file");
while ((s = openFile.ReadLine()) != null)
{
Console.WriteLine(s);
count++;
}
Console.WriteLine("");
}
Console.WriteLine("The number of lines in file {0} is: {1}", fileName, count);
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
Console.ReadKey();
}
public static void Main()
{
var fileName = @"mytest.txt";
int count;
try
{
// Delete the file if it exists.
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write("\n\n Count the number of lines in a file :\n");
Console.Write("------------------------------------------\n");
// Create the file.
using (var fileStr = File.CreateText(fileName))
{
fileStr.WriteLine(" test line 1");
fileStr.WriteLine(" test line 2");
fileStr.WriteLine(" Test line 3");
fileStr.WriteLine(" test line 4");
fileStr.WriteLine(" test line 5");
fileStr.WriteLine(" Test line 6");
}
using (var sr = File.OpenText(fileName))
{
var s = "";
count = 0;
Console.WriteLine(" Here is the content of the file mytest.txt : ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
count++;
}
Console.WriteLine("");
}
Console.Write(" The number of lines in the file {0} is : {1} \n\n", fileName, count);
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
public static void Main()
{
var fileName = @"mytest.txt";
try
{
// Delete the file if it exists.
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write("\n\n Read the first line from a file :\n");
Console.Write("---------------------------------------\n");
// Create the file.
using (var fileStr = File.CreateText(fileName))
{
fileStr.WriteLine(" test line 1");
fileStr.WriteLine(" test line 2");
fileStr.WriteLine(" Test line 3");
}
using (var sr = File.OpenText(fileName))
{
var s = "";
Console.WriteLine(" Here is the content of the file mytest.txt : ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine("");
}
Console.Write("\n The content of the first line of the file is :\n");
if (File.Exists(fileName))
{
var lines = File.ReadAllLines(fileName);
Console.Write(lines[0]);
}
Console.WriteLine();
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
public static void MainFH1()
{
string fileName = @"mytest.txt";
try
{
Console.Write("\n\n Create a file named mytest.txt in the disk :\n");
Console.Write("------------------------------------------------\n");
// Create the file.
using (FileStream fileStr = File.Create(fileName))
{
Console.WriteLine(" A file created with name mytest.txt\n\n");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
//File handling:
static void Exercise50()
{
// Write a program in C# Sharp to create a blank file in the disk newly.
string fileName = @"C:\Users\Admin\Desktop\Basics\mytest.txt";
try
{
Console.Write("\n\n Create a file named mytest.txt in the disk :\n");
Console.Write("------------------------------------------------\n");
// Create the file.
using (FileStream fileStr = File.Create(fileName))
{
Console.WriteLine(" A file created with name mytest.txt\n\n");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
// 1
public static void CreateBlankFile()
{
// C:\Users\tru55\Desktop\GitHub\Practice_April2020\File_Handling\
string fileName = @"C:\Users\tru55\Desktop\GitHub\Practice_April2020\File_Handling\mytest2.txt";
try
{
Console.WriteLine("Create a file named mytest2.txt in the disk");
Console.WriteLine("------------------------------------------");
// create the file
using (FileStream fileStr = File.Create(fileName))
{
Console.WriteLine("A file created with name mytest2.txt");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
public static void WriteFileName()
{
string fileName = @"mytest2.txt";
try
{
File.Create(fileName);
var fs = new FileStream(@"C:\mytest2.txt", FileMode.OpenOrCreate, FileAccess.Write);
StreamWriter writer = new StreamWriter(fs);
writer.Write("Hi.. This is the sample text file you have created using FileStream Class.");
writer.Close();
Console.Write("\n\n Create a file named mytest.txt in the disk :\n");
Console.Write("------------------------------------------------\n");
File.Create(fileName);
File.Create(@"D\:mytest.txt");
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
static void Main()
{
string fileName = @"mytext.txt";
try
{
//Delete file
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.WriteLine("Create a new file with content.");
Console.WriteLine("-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-");
//Create a file
using (StreamWriter fileStr = File.CreateText(fileName))
{
fileStr.WriteLine("Hello my friend!");
fileStr.WriteLine("This is the first context of this file.");
}
using (StreamReader sr = File.OpenText(fileName))
{
string s = "";
Console.WriteLine("This is the context of {0}", fileName);
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine();
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
public static void Main()
{
var fileName = @"mytest.txt";
try
{
// Delete the file if it exists.
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write("\n\n Create a file with text and read the file :\n");
Console.Write("-------------------------------------------------\n");
// Create the file.
using (var fileStr = File.CreateText(fileName))
{
fileStr.WriteLine(" Hello and Welcome");
fileStr.WriteLine(" It is the first content");
fileStr.WriteLine(" of the text file mytest.txt");
}
using (var sr = File.OpenText(fileName))
{
var s = "";
Console.WriteLine(" Here is the content of the file mytest.txt : ");
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine("");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
static void Main()
{
string file = @"mytest.txt";
try
{
if (File.Exists(file))
{
File.Delete(file);
}
Console.WriteLine("The program creates a file with test and read the file");
Console.WriteLine("----------------------------------------------------------");
using (StreamWriter str = File.CreateText(file))
{
str.WriteLine("Hello! ");
str.WriteLine("This is the content of this file...");
}
using (StreamReader streamReader = File.OpenText(file))
{
string s = " ";
Console.WriteLine("Here is the content of my file {0}", file);
while ((s = streamReader.ReadLine()) != null)
{
Console.WriteLine(s);
}
Console.WriteLine(" ");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
Console.ReadKey();
}
public static void Main()
{
var fileName = @"mytest.txt";
try
{
// Delete the file if it exists.
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write("\n\n Create a file in the disk if it is exists:\n");
Console.Write("-----------------------------------------------\n");
// Create the file.
using (var fileStr = File.Create(fileName))
{
Console.WriteLine(" A file created with name mytest.txt\n\n");
}
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}
// Created method for gathering user IP and writing to text file
static void WriteNetConfig()
{
// You can change the last component in parameter to add bat file to different location
string docPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
// Console input for naming the file
// The string "file" saves .bat to the end of the string so that when it is saved to the location of choice, it creates a functional .bat file
Console.Write("Enter the name of the batch file you wish to create: ");
string fileName = Console.ReadLine();
string file = fileName + ".bat";
try
{
// Deleting file name if name already exisits
if (File.Exists(Path.Combine(docPath, file)))
{
File.Delete(Path.Combine(docPath, file));
Console.WriteLine();
Console.WriteLine(file + " file name already in use.");
Console.WriteLine("Deleting " + file + " and rewriting!");
}
// Writing net configuration (IPv4 address, subnet mask, default gateway, DNS servers) to batch file
using (StreamWriter fileWrite = File.CreateText(Path.Combine(docPath, file)))
{
// Gathering local IPv4 address
#region
string ipAdd = "";
string userIP = "";
IPHostEntry host;
host = Dns.GetHostEntry(ipAdd);
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
userIP = ip.ToString();
}
}
#endregion
// Gathering the subnet mask
#region
string subnetMask = "";
NetworkInterface[] netInterfaces = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface subMask in netInterfaces)
{
if (subMask.OperationalStatus == OperationalStatus.Up)
{
if (subMask.NetworkInterfaceType == NetworkInterfaceType.Loopback)
{
continue;
}
UnicastIPAddressInformationCollection UnicastIPInfo = subMask.GetIPProperties().UnicastAddresses;
foreach (UnicastIPAddressInformation subnet in UnicastIPInfo.Skip(1))
{
subnetMask = subnet.IPv4Mask.ToString();
}
}
}
#endregion
// Gathering the default gateway
#region
IPAddress defGateway = null;
var netAdapt = NetworkInterface.GetAllNetworkInterfaces();
if (netAdapt.Any())
{
foreach (var adapter in netAdapt)
{
var ipProper = adapter.GetIPProperties();
if (ipProper == null)
{
continue;
}
var gateway1 = ipProper.GatewayAddresses;
if (!gateway1.Any())
{
continue;
}
var gateway2 = gateway1.FirstOrDefault(g => g.Address.AddressFamily.ToString() == "InterNetwork");
if (gateway2 == null)
{
continue;
}
defGateway = gateway2.Address;
}
}
#endregion
// Gathering the DNS server information
#region
string primaryDNS = "";
string alternateDNS = "";
foreach (NetworkInterface dnsServers in netInterfaces)
{
if (dnsServers.OperationalStatus == OperationalStatus.Up)
{
IPInterfaceProperties ipProperties = dnsServers.GetIPProperties();
IPAddressCollection dnsAddresses = ipProperties.DnsAddresses;
// Returns the first address for DNS servers by using .Take
foreach (IPAddress dns in dnsAddresses.Take(1))
{
primaryDNS = dns.ToString();
}
// Returns the second address for DNS servers by using .Skip(1)
foreach (IPAddress dns in dnsAddresses.Skip(1))
{
alternateDNS = dns.ToString();
}
break;
}
}
#endregion
// Gathering the network adapter name to be included into the batch file
#region
string adapterName = "";
foreach (NetworkInterface netAdapter in netInterfaces)
{
// If check for getting just the currently connected adapters as well as excluding the tunnel and loopback adapters
if (netAdapter.OperationalStatus == OperationalStatus.Up && netAdapter.NetworkInterfaceType != NetworkInterfaceType.Tunnel && netAdapter.NetworkInterfaceType != NetworkInterfaceType.Loopback)
{
adapterName = netAdapter.Name;
}
}
#endregion
// Writing the batch file script
fileWrite.WriteLine("@echo off");
fileWrite.WriteLine("netsh interface ipv4 set address name=\"" + adapterName + "\" static " + userIP + " " + subnetMask + " " + defGateway);
fileWrite.WriteLine();
fileWrite.WriteLine("@echo off");
fileWrite.WriteLine("netsh interface ipv4 set dns name=\"" + adapterName + "\" static " + primaryDNS + "");
fileWrite.WriteLine("netsh interface ipv4 add dns name=\"" + adapterName + "\" " + alternateDNS + " index=2");
}
// FInal console output
Console.WriteLine();
Console.WriteLine(file + " has successfully been created and added to user's desktop!");
Console.WriteLine();
Console.WriteLine("Press ENTER to exit....");
Console.ReadLine();
}
catch (Exception MyExcep)
{
Console.WriteLine(MyExcep.ToString());
}
}