C# SocketPermission.IsUnrestricted方法代码示例

//引入命名空间
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();
            while(attributeEnumerator.MoveNext())
            Console.WriteLine("Attribute - \"{0}\" , Value - \"{1}\"", ((IDictionaryEnumerator)attributeEnumerator).Key, 
                                                                    ((IDictionaryEnumerator)attributeEnumerator).Value); 
        }

        Console.WriteLine("");

        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 '192.168.144.238' for 'All' transport types and for 'All' ports for the ip-address.
        SecurityElement securityElement2 = new SecurityElement("URI", "192.168.144.238#-1#3");
      // Second 'SocketPermission' ip-address is '192.168.144.240' for 'All' transport types and for 'All' ports for the ip-address.
        SecurityElement securityElement3 = new SecurityElement("URI", "192.168.144.240#-1#3");
        securityElement1.AddChild(securityElement2);
        securityElement1.AddChild(securityElement3);
        securityElement4.AddChild(securityElement1);
        
       // Obtain a 'SocketPermission' object using 'FromXml' method.	
        socketPermission2.FromXml(securityElement4);

        // Create another 'SocketPermission' object with two ip addresses.
      // First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and for 'All' ports for the ip-address.
        SocketPermission socketPermission3 = 
                        new SocketPermission(NetworkAccess.Connect,
                                             TransportType.All,
                                             "192.168.144.238",
                                             SocketPermission.AllPorts);

      // Second 'SocketPermission' ip-address is '192.168.144.239' for 'All' transport types and for 'All' ports for the ip-address.
        socketPermission3.AddPermission(NetworkAccess.Connect,
                                       TransportType.All,
                                       "192.168.144.239",
                                       SocketPermission.AllPorts);

        Console.WriteLine("\nChecks the Socket permissions using IsUnrestricted method : ");
        if(socketPermission1.IsUnrestricted())
            Console.WriteLine("Socket permission is unrestricted");
        else
            Console.WriteLine("Socket permission is restricted");

        Console.WriteLine();

        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("");

        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.
        socketPermission1.Demand();

        // 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 "";
        }
    }
};