/// <summary>
/// Determines whether it is possible to connect to the specified host.
/// </summary>
/// <param name="host">The host.</param>
/// <param name="port">The port.</param>
/// <returns>
/// <c>true</c> if this instance can connect the specified host; otherwise, <c>false</c>.
/// </returns>
/// <example>
/// if (NetworkHelper.CanConnect("www.Microsoft.com", 80))
/// {
/// // ... do something with the connection
/// }
/// </example>
public static bool CanConnect(string host, int port)
{
bool result;
try
{
string localHostname = Dns.GetHostName();
IPHostEntry localHostEntry = Dns.GetHostEntry(localHostname);
IPHostEntry remoteHostEntry = Dns.GetHostEntry(host);
NetworkInterface[] networks = NetworkInterface.GetAllNetworkInterfaces();
NetworkInterface[] array = networks;
for (int i = 0; i < array.Length; i++)
{
NetworkInterface network = array[i];
if (network.OperationalStatus == OperationalStatus.Up && network.NetworkInterfaceType != NetworkInterfaceType.Loopback && network.NetworkInterfaceType != NetworkInterfaceType.Tunnel)
{
IPInterfaceProperties interfaceProperties = network.GetIPProperties();
List <IPAddressInformation> adapterAddressList = NetworkHelper.GetAllAddressesForAdapter(interfaceProperties);
IPAddress[] addressList = localHostEntry.AddressList;
for (int j = 0; j < addressList.Length; j++)
{
IPAddress localHostAddress = addressList[j];
if (NetworkHelper.CanConnectFromAddress(localHostAddress, adapterAddressList, remoteHostEntry, port))
{
result = true;
return(result);
}
}
}
}
result = false;
}
catch (Exception)
{
result = false;
}
return(result);
}
/// <summary>
/// Determines whether it is possible to connect to the specified host.
/// </summary>
/// <param name="host">The host.</param>
/// <returns>
/// <c>true</c> if this instance can connect the specified host; otherwise, <c>false</c>.
/// </returns>
/// <example>
/// if (NetworkHelper.CanConnect("www.Microsoft.com"))
/// {
/// // ... do something with the connection
/// }
/// </example>
/// <remarks>Port 80 is used to make the connection attempt.</remarks>
public static bool CanConnect(string host)
{
return(NetworkHelper.CanConnect(host, 80));
}