Socket 建構函式

定義

命名空間:: System.Net.Sockets

組件:: netstandard.dll, System.Net.Sockets.dll

組件:: System.Net.Sockets.dll

組件:: System.dll

組件:: netstandard.dll

組件:: System.dll, System.Net.Sockets.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

初始化 Socket 類別的新執行個體。

多載

名稱	Description
Socket(SafeSocketHandle)	初始化該類別的新實例 Socket ，以啟用指定的套接字句柄。
Socket(SocketInformation)	使用從返回DuplicateAndClose(Int32)的指定值初始化該類別的新Socket實例。
Socket(SocketType, ProtocolType)	使用指定的套接字類型與協定初始化該類別的新 Socket 實例。若作業系統支援 IPv6，此建構子會產生雙模式套接字;否則，它會建立一個 IPv4 插槽。
Socket(AddressFamily, SocketType, ProtocolType)	使用指定的位址族、套接字類型與協定初始化該類別的新 Socket 實例。

Socket(SafeSocketHandle)

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

初始化該類別的新實例 Socket ，以啟用指定的套接字句柄。

public:
 Socket(System::Net::Sockets::SafeSocketHandle ^ handle);

public Socket(System.Net.Sockets.SafeSocketHandle handle);

new System.Net.Sockets.Socket : System.Net.Sockets.SafeSocketHandle -> System.Net.Sockets.Socket

Public Sub New (handle As SafeSocketHandle)

參數

handle: SafeSocketHandle

物件將要封裝的套筒 Socket 的套筒把手。

例外狀況

ArgumentNullException

handle 為 null。

ArgumentException

handle 無效。

SocketException

handle 不是套接字，或無法存取有關套接字的資訊。

備註

此方法會將從所提供SafeSocketHandle的資料填充實Socket例。不同作業系統對於查詢 socket handle 或檔案描述符的屬性與設定，提供不同程度的支援。結果 Socket 實例中某些公開 API 可能因作業系統而異，例如 ProtocolType 和 Blocking。

適用於

Socket(SocketInformation)

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

使用從返回DuplicateAndClose(Int32)的指定值初始化該類別的新Socket實例。

public:
 Socket(System::Net::Sockets::SocketInformation socketInformation);

[System.Runtime.Versioning.SupportedOSPlatform("windows")]
public Socket(System.Net.Sockets.SocketInformation socketInformation);

public Socket(System.Net.Sockets.SocketInformation socketInformation);

[<System.Runtime.Versioning.SupportedOSPlatform("windows")>]
new System.Net.Sockets.Socket : System.Net.Sockets.SocketInformation -> System.Net.Sockets.Socket

new System.Net.Sockets.Socket : System.Net.Sockets.SocketInformation -> System.Net.Sockets.Socket

Public Sub New (socketInformation As SocketInformation)

參數

socketInformation: SocketInformation

套接字資訊由返回。DuplicateAndClose(Int32)

屬性: SupportedOSPlatformAttribute

備註

如果你多次呼叫 Socket 建構子，每次呼叫的參數都是相同的位元組陣列，你會建立多個擁有相同底層套接字的受管理 Sockets。這種做法是強烈不建議的。

適用於

Socket(SocketType, ProtocolType)

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

使用指定的套接字類型與協定初始化該類別的新 Socket 實例。若作業系統支援 IPv6，此建構子會產生雙模式套接字;否則，它會建立一個 IPv4 插槽。

public:
 Socket(System::Net::Sockets::SocketType socketType, System::Net::Sockets::ProtocolType protocolType);

public Socket(System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType);

new System.Net.Sockets.Socket : System.Net.Sockets.SocketType * System.Net.Sockets.ProtocolType -> System.Net.Sockets.Socket

Public Sub New (socketType As SocketType, protocolType As ProtocolType)

參數

socketType: SocketType

這是其中一項 SocketType 價值。

protocolType: ProtocolType

這是其中一項 ProtocolType 價值。

例外狀況

SocketException

與的socketTypeprotocolType組合會導致無效的套接字。

備註

參數 socketType 指定類別的類型 Socket ， protocolType 參數則指定所 Socket使用的協定。這兩個參數並非獨立。通常 Socket 這種類型是協議中隱含的。如果型別與協定型別的組合 Socket 產生無效 Socket，此建構子會拋出一個 SocketException。

備註

如果這個建構子拋出， SocketException請使用該 SocketException.ErrorCode 屬性來取得特定的錯誤碼。取得此程式碼後，請參閱 Windows Sockets 版本 2 API 錯誤代碼文件，以獲得錯誤的詳細說明。

備註

當您在應用程式中啟用網路追蹤時，此成員會輸出追蹤資訊。欲了解更多資訊，請參閱 .NET Framework 中的網路追蹤。

適用於

Socket(AddressFamily, SocketType, ProtocolType)

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

來源:: Socket.cs

使用指定的位址族、套接字類型與協定初始化該類別的新 Socket 實例。

public:
 Socket(System::Net::Sockets::AddressFamily addressFamily, System::Net::Sockets::SocketType socketType, System::Net::Sockets::ProtocolType protocolType);

public Socket(System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType);

new System.Net.Sockets.Socket : System.Net.Sockets.AddressFamily * System.Net.Sockets.SocketType * System.Net.Sockets.ProtocolType -> System.Net.Sockets.Socket

Public Sub New (addressFamily As AddressFamily, socketType As SocketType, protocolType As ProtocolType)

參數

addressFamily: AddressFamily

這是其中一項 AddressFamily 價值。

socketType: SocketType

這是其中一項 SocketType 價值。

protocolType: ProtocolType

這是其中一項 ProtocolType 價值。

例外狀況

SocketException

addressFamily組合、 socketType、 protocolType 會產生無效的套接字。

範例

下列程式代碼範例示範如何建立類別的 Socket 實例。

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;

public class Sample
{

  public static string DoSocketGet(string server)
  {
    //Set up variables and String to write to the server.
    Encoding ASCII = Encoding.ASCII;
    string Get = "GET / HTTP/1.1\r\nHost: " + server +
                 "\r\nConnection: Close\r\n\r\n";
    Byte[] ByteGet = ASCII.GetBytes(Get);
    Byte[] RecvBytes = new Byte[256];
    String strRetPage = null;

    // IPAddress and IPEndPoint represent the endpoint that will
    //   receive the request.
    // Get first IPAddress in list return by DNS.

    try
    {

      // Define those variables to be evaluated in the next for loop and
      // then used to connect to the server. These variables are defined
      // outside the for loop to make them accessible there after.
      Socket s = null;
      IPEndPoint hostEndPoint;
      IPAddress hostAddress = null;
      int conPort = 80;

      // Get DNS host information.
      IPHostEntry hostInfo = Dns.GetHostEntry(server);
      // Get the DNS IP addresses associated with the host.
      IPAddress[] IPaddresses = hostInfo.AddressList;

      // Evaluate the socket and receiving host IPAddress and IPEndPoint.
      for (int index=0; index<IPaddresses.Length; index++)
      {
        hostAddress = IPaddresses[index];
        hostEndPoint = new IPEndPoint(hostAddress, conPort);


        // Creates the Socket to send data over a TCP connection.
        s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );


        // Connect to the host using its IPEndPoint.
        s.Connect(hostEndPoint);

        if (!s.Connected)
        {
          // Connection failed, try next IPaddress.
          strRetPage = "Unable to connect to host";
          s = null;
          continue;
        }

        // Sent the GET request to the host.
        s.Send(ByteGet, ByteGet.Length, 0);

      } // End of the for loop.


      // Receive the host home page content and loop until all the data is received.
      Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
      strRetPage = "Default HTML page on " + server + ":\r\n";
      strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);

      while (bytes > 0)
      {
        bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
        strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
      }

    } // End of the try block.

    catch(SocketException e)
    {
      Console.WriteLine("SocketException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(ArgumentNullException e)
    {
      Console.WriteLine("ArgumentNullException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(NullReferenceException e)
    {
      Console.WriteLine("NullReferenceException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(Exception e)
    {
      Console.WriteLine("Exception caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

    return strRetPage;
}
   public static void Main()
   {
      Console.WriteLine(DoSocketGet("localhost"));
   }
 }

Imports System.Text
Imports System.IO
Imports System.Net
Imports System.Net.Sockets

 _

Public Class Sample
   
   
   Public Shared Function DoSocketGet(server As String) As String
      'Set up variables and String to write to the server.
    Dim ASCII As Encoding = Encoding.ASCII
    Dim [Get] As String = "GET / HTTP/1.1" + ControlChars.Lf + ControlChars.NewLine + "Host: " + server + ControlChars.Lf + ControlChars.NewLine + "Connection: Close" + ControlChars.Lf + ControlChars.NewLine + ControlChars.Lf + ControlChars.NewLine
    Dim ByteGet As [Byte]() = ASCII.GetBytes([Get])
    Dim RecvBytes(256) As [Byte]
    Dim strRetPage As [String] = Nothing


      
      ' IPAddress and IPEndPoint represent the endpoint that will
      '   receive the request.
      ' Get first IPAddress in list return by DNS.
      Try

 

         ' Define those variables to be evaluated in the next for loop and 
         ' then used to connect to the server. These variables are defined
         ' outside the for loop to make them accessible there after.
         Dim s As Socket = Nothing
         Dim hostEndPoint As IPEndPoint
         Dim hostAddress As IPAddress = Nothing
         Dim conPort As Integer = 80
         
         ' Get DNS host information.
         Dim hostInfo As IPHostEntry = Dns.Resolve(server)
         ' Get the DNS IP addresses associated with the host.
         Dim IPaddresses As IPAddress() = hostInfo.AddressList
         
         ' Evaluate the socket and receiving host IPAddress and IPEndPoint. 
      Dim index As Integer = 0
      For index = 0 To IPaddresses.Length - 1
        hostAddress = IPaddresses(index)
        hostEndPoint = New IPEndPoint(hostAddress, conPort)


        ' Creates the Socket to send data over a TCP connection.
        s = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)


        ' Connect to the host using its IPEndPoint.
        s.Connect(hostEndPoint)

        If Not s.Connected Then
          ' Connection failed, try next IPaddress.
          strRetPage = "Unable to connect to host"
          s = Nothing
          GoTo ContinueFor1
        End If


        ' Sent the GET request to the host.
        s.Send(ByteGet, ByteGet.Length, 0)


ContinueFor1:
      Next index  ' End of the for loop.
      



      ' Receive the host home page content and loop until all the data is received.

      'Dim bytes As Int32 = s.Receive(RecvBytes, RecvBytes.Length, 0)
      Dim bytes As Int32 = s.Receive(RecvBytes, RecvBytes.Length, 0)

      strRetPage = "Default HTML page on " + server + ":\r\n"
      strRetPage = "Default HTML page on " + server + ":" + ControlChars.Lf + ControlChars.NewLine

      Dim i As Integer

      While bytes > 0

        bytes = s.Receive(RecvBytes, RecvBytes.Length, 0)

        strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes)

      End While


      ' End of the try block.
    Catch e As SocketException
         Console.WriteLine("SocketException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      Catch e As ArgumentNullException
         Console.WriteLine("ArgumentNullException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      Catch e As NullReferenceException
         Console.WriteLine("NullReferenceException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      Catch e As Exception
         Console.WriteLine("Exception caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      End Try
      
      Return strRetPage
   End Function 'DoSocketGet
    
   Public Shared Sub Main()
    Console.WriteLine(DoSocketGet("localhost"))
   End Sub
End Class

備註

參數 addressFamily 指定類別所使用的位址方案 Socket ， socketType 參數指定類別的型別 Socket ， protocolType 參數則指定所 Socket使用的協定。這三個參數並非獨立。有些位址家族會限制可與之搭配使用的協定，且通常 Socket 協定中隱含了該類型。如果位址族、 Socket 類型和協定類型的組合產生無效 Socket，則此構造子會拋出一個 SocketException。

備註

當您在應用程式中啟用網路追蹤時，此成員會輸出追蹤資訊。欲了解更多資訊，請參閱 .NET Framework 中的網路追蹤。

另請參閱

適用於

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共用方式為

Socket 建構函式

定義

多載

Socket(SafeSocketHandle)

參數

例外狀況

備註

適用於

Socket(SocketInformation)

參數

備註

適用於

Socket(SocketType, ProtocolType)

參數

例外狀況

備註

適用於

Socket(AddressFamily, SocketType, ProtocolType)

參數

例外狀況

範例

備註

另請參閱

適用於

意見反應