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SocketPermission.ConnectList Property

Gets a list of EndpointPermission instances that identifies the endpoints that can be connected to under this permission instance.

Namespace:  System.Net
Assembly:  System (in System.dll)

public IEnumerator ConnectList { get; }

Property Value

Type: System.Collections.IEnumerator
An instance that implements the IEnumerator interface that contains EndpointPermission instances.

The following example uses the ConnectList property to return a list of endpoints to which connection privileges are granted.

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Collections;
using System.Security;
using System.Security.Permissions;

public class DateClient {

	private Socket serverSocket;
	private Encoding asciiEncoding; 
	private IPAddress serverAddress;

	private int serverPort;

	// The constructor takes the address and port of the remote server.
	public DateClient(IPAddress serverIpAddress, int port) {
		serverAddress = serverIpAddress;
		serverPort = port;
		serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
		asciiEncoding = Encoding.ASCII;

	// Print a security element and all its children, in a depth-first manner.
	private void PrintSecurityElement(SecurityElement securityElementObj, int depth) {

		Console.WriteLine("Depth    : {0}", depth);
		Console.WriteLine("Tag      : {0}", securityElementObj.Tag);
		Console.WriteLine("Text     : {0}", securityElementObj.Text);
		if(securityElementObj.Children != null)
			Console.WriteLine("Children : {0}", securityElementObj.Children.Count);

		if(securityElementObj.Attributes != null) {
			IEnumerator attributeEnumerator = securityElementObj.Attributes.GetEnumerator();
			Console.WriteLine("Attribute - \"{0}\" , Value - \"{1}\"", ((IDictionaryEnumerator)attributeEnumerator).Key, 


		if(securityElementObj.Children != null) {
			depth += 1;
			for(int i = 0; i < securityElementObj.Children.Count; i++) 
				PrintSecurityElement((SecurityElement)(securityElementObj.Children[i]), depth);

	public String GetDate() 

		SocketPermission socketPermission1 = new SocketPermission(PermissionState.Unrestricted);

		// Create a 'SocketPermission' object for two ip addresses.
		SocketPermission socketPermission2 = new SocketPermission(PermissionState.None);
		SecurityElement securityElement4 = socketPermission2.ToXml();
      // 'SocketPermission' object for 'Connect' permission
		SecurityElement securityElement1 = new SecurityElement("ConnectAccess");
      // Format to specify ip address are <ip-address>#<port>#<transport-type>
		// First 'SocketPermission' ip-address is '' for 'All' transport types and for 'All' ports for the ip-address.
		SecurityElement securityElement2 = new SecurityElement("URI", "");
      // Second 'SocketPermission' ip-address is '' for 'All' transport types and for 'All' ports for the ip-address.
		SecurityElement securityElement3 = new SecurityElement("URI", "");
	   // Obtain a 'SocketPermission' object using 'FromXml' method.	

		// Create another 'SocketPermission' object with two ip addresses.
      // First 'SocketPermission' ip-address is '' for 'All' transport types and for 'All' ports for the ip-address.
		SocketPermission socketPermission3 = 
						new SocketPermission(NetworkAccess.Connect,

      // Second 'SocketPermission' ip-address is '' for 'All' transport types and for 'All' ports for the ip-address.

		Console.WriteLine("\nChecks the Socket permissions using IsUnrestricted method : ");
			Console.WriteLine("Socket permission is unrestricted");
			Console.WriteLine("Socket permission is restricted");


		Console.WriteLine("Display result of ConnectList property : \n");
		IEnumerator enumerator = socketPermission3.ConnectList;
		while(enumerator.MoveNext()) {
			Console.WriteLine("The hostname is       : {0}", ((EndpointPermission)enumerator.Current).Hostname);
			Console.WriteLine("The port is           : {0}", ((EndpointPermission)enumerator.Current).Port);
			Console.WriteLine("The Transport type is : {0}", ((EndpointPermission)enumerator.Current).Transport);

		Console.WriteLine("Display Security Elements :\n ");
		PrintSecurityElement(socketPermission2.ToXml(), 0);

		// Get a 'SocketPermission' object which is a union of two other 'SocketPermission' objects.
		socketPermission1 = (SocketPermission)socketPermission3.Union(socketPermission2);

		// Demand that the calling method have the socket permission.

		// Get the current date from the remote date server.
		try {
			int bytesReceived;		
			byte[] getByte = new byte[100];
			serverSocket.Connect(new IPEndPoint( serverAddress, serverPort));
			bytesReceived = serverSocket.Receive( getByte, getByte.Length, 0 );
			return asciiEncoding.GetString( getByte, 0, bytesReceived );
		catch(Exception e)
			Console.WriteLine("\nException raised : {0}", e.Message);
			return "";

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.