UdpClient.BeginSend 方法

参考

定义

命名空间:: System.Net.Sockets

程序集:: System.Net.Sockets.dll

程序集:: System.dll

程序集:: netstandard.dll

重要

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将数据报异步发送到远程主机。

重载

BeginSend(Byte[], Int32, String, Int32, AsyncCallback, Object)	将数据报异步发送到目标。目标由主机名和端口号指定。
BeginSend(Byte[], Int32, IPEndPoint, AsyncCallback, Object)	将数据报异步发送到目标。目标由 EndPoint 指定。
BeginSend(Byte[], Int32, AsyncCallback, Object)	将数据报异步发送到远程主机。先前已通过调用 Connect 指定目标。

BeginSend(Byte[], Int32, String, Int32, AsyncCallback, Object)

Source:: UDPClient.cs

Source:: UDPClient.cs

Source:: UDPClient.cs

将数据报异步发送到目标。目标由主机名和端口号指定。

public:
 IAsyncResult ^ BeginSend(cli::array <System::Byte> ^ datagram, int bytes, System::String ^ hostname, int port, AsyncCallback ^ requestCallback, System::Object ^ state);

public IAsyncResult BeginSend (byte[] datagram, int bytes, string? hostname, int port, AsyncCallback? requestCallback, object? state);

public IAsyncResult BeginSend (byte[] datagram, int bytes, string hostname, int port, AsyncCallback requestCallback, object state);

member this.BeginSend : byte[] * int * string * int * AsyncCallback * obj -> IAsyncResult

Public Function BeginSend (datagram As Byte(), bytes As Integer, hostname As String, port As Integer, requestCallback As AsyncCallback, state As Object) As IAsyncResult

参数

datagram: Byte[]

一个 Byte 数组，其中包含要发送的数据。

bytes: Int32

要发送的字节数。

hostname: String

目标主机。

port: Int32

目标端口号。

requestCallback: AsyncCallback

一个 AsyncCallback 委托，它引用操作完成时要调用的方法。

state: Object

一个用户定义的对象，其中包含该发送操作的信息。当操作完成时，此对象会被传递给 requestCallback 委托。

IAsyncResult

一个 IAsyncResult 对象，它引用异步发送。

示例

下面的代码示例使用 BeginSend 异步发送服务器请求。

public:
    static bool isMessageSent;

    static void SendCallback(IAsyncResult^ asyncResult)
    {
        UdpClient^ udpClient = (UdpClient^)asyncResult->AsyncState;

        Console::WriteLine("number of bytes sent: {0}",
            udpClient->EndSend(asyncResult));
        isMessageSent = true;
    }

public static bool messageSent = false;

public static void SendCallback(IAsyncResult ar)
{
    UdpClient u = (UdpClient)ar.AsyncState;

    Console.WriteLine($"number of bytes sent: {u.EndSend(ar)}");
    messageSent = true;
}

public:
    static void SendMessage3(String^ server, String^ message)
    {
        // create the udp socket
        UdpClient^ udpClient = gcnew UdpClient();

        array<Byte>^ sendBytes = Encoding::ASCII->GetBytes(message);

        // send the message
        // the destination is defined by the server name and port
        udpClient->BeginSend(sendBytes, sendBytes->Length, server, listenPort,
            gcnew AsyncCallback(SendCallback), udpClient);

        // Do some work while we wait for the send to complete. For
        // this example, we'll just sleep
        while (!isMessageSent)
        {
            Thread::Sleep(100);
        }
    }

static void SendMessage3(string server, string message)
{
    // create the udp socket
    UdpClient u = new UdpClient();

    byte[] sendBytes = Encoding.ASCII.GetBytes(message);

    // send the message
    // the destination is defined by the server name and port
    u.BeginSend(sendBytes, sendBytes.Length, server, s_listenPort, new AsyncCallback(SendCallback), u);

    // Do some work while we wait for the send to complete. For this example, we'll just sleep
    while (!messageSent)
    {
        Thread.Sleep(100);
    }
}

注解

BeginSend异步操作必须通过调用 EndSend 方法来完成。通常，委托会调用 requestCallback 方法。

在操作完成之前，此方法不会阻止。若要在操作完成之前阻止，请使用方法重载之 Send 一。

有关使用异步编程模型的详细信息，请参阅异步调用同步方法。

适用于

BeginSend(Byte[], Int32, IPEndPoint, AsyncCallback, Object)

Source:: UDPClient.cs

Source:: UDPClient.cs

Source:: UDPClient.cs

将数据报异步发送到目标。目标由 EndPoint 指定。

public:
 IAsyncResult ^ BeginSend(cli::array <System::Byte> ^ datagram, int bytes, System::Net::IPEndPoint ^ endPoint, AsyncCallback ^ requestCallback, System::Object ^ state);

public IAsyncResult BeginSend (byte[] datagram, int bytes, System.Net.IPEndPoint? endPoint, AsyncCallback? requestCallback, object? state);

public IAsyncResult BeginSend (byte[] datagram, int bytes, System.Net.IPEndPoint endPoint, AsyncCallback requestCallback, object state);

member this.BeginSend : byte[] * int * System.Net.IPEndPoint * AsyncCallback * obj -> IAsyncResult

Public Function BeginSend (datagram As Byte(), bytes As Integer, endPoint As IPEndPoint, requestCallback As AsyncCallback, state As Object) As IAsyncResult

参数

datagram: Byte[]

一个 Byte 数组，其中包含要发送的数据。

bytes: Int32

要发送的字节数。

endPoint: IPEndPoint

EndPoint，它表示数据的目标位置。

requestCallback: AsyncCallback

一个 AsyncCallback 委托，它引用操作完成时要调用的方法。

state: Object

一个用户定义的对象，其中包含该发送操作的信息。当操作完成时，此对象会被传递给 requestCallback 委托。

IAsyncResult

一个 IAsyncResult 对象，它引用异步发送。

示例

下面的代码示例使用 BeginSend 异步发送服务器请求。

public:
    static bool isMessageSent;

    static void SendCallback(IAsyncResult^ asyncResult)
    {
        UdpClient^ udpClient = (UdpClient^)asyncResult->AsyncState;

        Console::WriteLine("number of bytes sent: {0}",
            udpClient->EndSend(asyncResult));
        isMessageSent = true;
    }

public static bool messageSent = false;

public static void SendCallback(IAsyncResult ar)
{
    UdpClient u = (UdpClient)ar.AsyncState;

    Console.WriteLine($"number of bytes sent: {u.EndSend(ar)}");
    messageSent = true;
}

public:
    static void SendMessage2(String^ server, String^ message)
    {
        // create the udp socket
        UdpClient^ udpClient = gcnew UdpClient();
        array<Byte>^ sendBytes = Encoding::ASCII->GetBytes(message);

        // resolve the server name
        IPHostEntry^ resolvedServer = Dns::GetHostEntry(server);

        IPEndPoint^ ipEndPoint =
            gcnew IPEndPoint(resolvedServer->AddressList[0], listenPort);

        // send the message
        // the destination is defined by the IPEndPoint
        udpClient->BeginSend(sendBytes, sendBytes->Length, ipEndPoint,
            gcnew AsyncCallback(SendCallback), udpClient);

        // Do some work while we wait for the send to complete. For
        // this example, we'll just sleep
        while (!isMessageSent)
        {
            Thread::Sleep(100);
        }
    }

static void SendMessage2(string server, string message)
{
    // create the udp socket
    UdpClient u = new UdpClient();
    byte[] sendBytes = Encoding.ASCII.GetBytes(message);

    // resolve the server name
    IPHostEntry heserver = Dns.GetHostEntry(server);

    IPEndPoint e = new IPEndPoint(heserver.AddressList[0], s_listenPort);

    // send the message
    // the destination is defined by the IPEndPoint
    u.BeginSend(sendBytes, sendBytes.Length, e, new AsyncCallback(SendCallback), u);

    // Do some work while we wait for the send to complete. For this example, we'll just sleep
    while (!messageSent)
    {
        Thread.Sleep(100);
    }
}

注解

BeginSend异步操作必须通过调用 EndSend 方法来完成。通常，委托会调用 requestCallback 方法。

在操作完成之前，此方法不会阻止。若要在操作完成之前阻止，请使用方法重载之 Send 一。

有关使用异步编程模型的详细信息，请参阅异步调用同步方法。

适用于

BeginSend(Byte[], Int32, AsyncCallback, Object)

Source:: UDPClient.cs

Source:: UDPClient.cs

Source:: UDPClient.cs

将数据报异步发送到远程主机。先前已通过调用 Connect 指定目标。

public:
 IAsyncResult ^ BeginSend(cli::array <System::Byte> ^ datagram, int bytes, AsyncCallback ^ requestCallback, System::Object ^ state);

public IAsyncResult BeginSend (byte[] datagram, int bytes, AsyncCallback? requestCallback, object? state);

public IAsyncResult BeginSend (byte[] datagram, int bytes, AsyncCallback requestCallback, object state);

member this.BeginSend : byte[] * int * AsyncCallback * obj -> IAsyncResult

Public Function BeginSend (datagram As Byte(), bytes As Integer, requestCallback As AsyncCallback, state As Object) As IAsyncResult

参数

datagram: Byte[]

一个 Byte 数组，其中包含要发送的数据。

bytes: Int32

要发送的字节数。

requestCallback: AsyncCallback

一个 AsyncCallback 委托，它引用操作完成时要调用的方法。

state: Object

一个用户定义的对象，其中包含该发送操作的信息。当操作完成时，此对象会被传递给 requestCallback 委托。

IAsyncResult

一个 IAsyncResult 对象，它引用异步发送。

示例

下面的代码示例使用 BeginSend 异步发送服务器请求。

public:
    static bool isMessageSent;

    static void SendCallback(IAsyncResult^ asyncResult)
    {
        UdpClient^ udpClient = (UdpClient^)asyncResult->AsyncState;

        Console::WriteLine("number of bytes sent: {0}",
            udpClient->EndSend(asyncResult));
        isMessageSent = true;
    }

public static bool messageSent = false;

public static void SendCallback(IAsyncResult ar)
{
    UdpClient u = (UdpClient)ar.AsyncState;

    Console.WriteLine($"number of bytes sent: {u.EndSend(ar)}");
    messageSent = true;
}

public:
    static void SendMessage1(String^ server, String^ message)
    {
        // create the udp socket
        UdpClient^ udpClient = gcnew UdpClient();

        udpClient->Connect(server, listenPort);
        array<Byte>^ sendBytes = Encoding::ASCII->GetBytes(message);

        // send the message
        // the destination is defined by the call to .Connect()
        udpClient->BeginSend(sendBytes, sendBytes->Length,
            gcnew AsyncCallback(SendCallback), udpClient);

        // Do some work while we wait for the send to complete. For
        // this example, we'll just sleep
        while (!isMessageSent)
        {
            Thread::Sleep(100);
        }
    }

static void SendMessage1(string server, string message)
{
    // create the udp socket
    UdpClient u = new UdpClient();

    u.Connect(server, s_listenPort);
    byte[] sendBytes = Encoding.ASCII.GetBytes(message);

    // send the message
    // the destination is defined by the call to .Connect()
    u.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), u);

    // Do some work while we wait for the send to complete. For this example, we'll just sleep
    while (!messageSent)
    {
        Thread.Sleep(100);
    }
}

注解

BeginSend异步操作必须通过调用 EndSend 方法来完成。通常，委托会调用 requestCallback 方法。

在操作完成之前，此方法不会阻止。若要在操作完成之前阻止，请使用方法重载之 Send 一。

有关使用异步编程模型的详细信息，请参阅异步调用同步方法。

适用于

通过

UdpClient.BeginSend 方法

定义

重载

BeginSend(Byte[], Int32, String, Int32, AsyncCallback, Object)

参数

返回

示例

注解

适用于

BeginSend(Byte[], Int32, IPEndPoint, AsyncCallback, Object)

参数

返回

示例

注解

适用于

BeginSend(Byte[], Int32, AsyncCallback, Object)

参数

返回

示例

注解

适用于

其他资源