NegotiateStream.Write(Byte[], Int32, Int32) 方法

定义

命名空间:

System.Net.Security

程序集:

System.Net.Security.dll

Source:

NegotiateStream.cs

使用指定的缓冲区和偏移将指定数目的 Byte 写入基础流。

public:
 override void Write(cli::array <System::Byte> ^ buffer, int offset, int count);

public override void Write (byte[] buffer, int offset, int count);

override this.Write : byte[] * int * int -> unit

Public Overrides Sub Write (buffer As Byte(), offset As Integer, count As Integer)

参数

buffer

Byte[]

一个 Byte 数组，该数组提供要写入流中的字节。

offset

Int32

包含 buffer 中从零开始的位置的 Int32，将从此位置开始读取要写入到流中的字节。

count

Int32

Int32，其中包含要从 buffer 读取的字节数。

例外

ArgumentNullException

buffer 为 null。

ArgumentException

offset is less than 0.

- 或 -

offset 大于 buffer 的长度。

- 或 -

offset 加上计数大于 buffer 的长度。

IOException

写操作失败。

- 或 -

正在使用加密，但未能加密该数据。

NotSupportedException

已存在一个正在执行的写操作。

ObjectDisposedException

此对象已关闭。

InvalidOperationException

未进行身份验证。

示例

下面的代码示例演示如何写入 NegotiateStream。

int main()
{
   
   // Establish the remote endpoint for the socket.
   // For this example, use the local machine.
   IPHostEntry^ ipHostInfo = Dns::GetHostEntry( Dns::GetHostName() );
   IPAddress^ ipAddress = ipHostInfo->AddressList[ 0 ];
   
   // Client and server use port 11000. 
   IPEndPoint^ remoteEP = gcnew IPEndPoint( ipAddress,11000 );
   
   // Create a TCP/IP socket.
   TcpClient^ client = gcnew TcpClient;
   
   // Connect the socket to the remote endpoint.
   client->Connect( remoteEP );
   Console::WriteLine( L"Client connected to {0}.", remoteEP );
   
   // Ensure the client does not close when there is 
   // still data to be sent to the server.
   client->LingerState = (gcnew LingerOption( true,0 ));
   
   // Request authentication.
   NetworkStream^ clientStream = client->GetStream();
   NegotiateStream^ authStream = gcnew NegotiateStream( clientStream );
   
   // Request authentication for the client only (no mutual authentication).
   // Authenicate using the client's default credetials.
   // Permit the server to impersonate the client to access resources on the server only.
   // Request that data be transmitted using encryption and data signing.
   authStream->AuthenticateAsClient( dynamic_cast<NetworkCredential^>(CredentialCache::DefaultCredentials), 
          L"", 
          ProtectionLevel::EncryptAndSign, 
          TokenImpersonationLevel::Impersonation );
   
   DisplayAuthenticationProperties( authStream );
   DisplayStreamProperties( authStream );
   if ( authStream->CanWrite )
   {
      
      // Encode the test data into a byte array.
      array<Byte>^message = System::Text::Encoding::UTF8->GetBytes( L"Hello from the client." );
      authStream->Write( message, 0, message->Length );
      authStream->Flush();
      Console::WriteLine( L"Sent {0} bytes.", message->Length );
   }

   
   // Close the client connection.
   authStream->Close();
   Console::WriteLine( L"Client closed." );
}

    public static void Main(String[] args)
    {
        // Establish the remote endpoint for the socket.
        // For this example, use the local machine.
        IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
        IPAddress ipAddress = ipHostInfo.AddressList[0];
        // Client and server use port 11000.
        IPEndPoint remoteEP = new IPEndPoint(ipAddress,11000);
        // Create a TCP/IP socket.
       TcpClient client = new TcpClient();
        // Connect the socket to the remote endpoint.
        client.Connect(remoteEP);
        Console.WriteLine("Client connected to {0}.",
            remoteEP.ToString());
        // Ensure the client does not close when there is
        // still data to be sent to the server.
        client.LingerState = (new LingerOption(true,0));
        // Request authentication.
        NetworkStream clientStream = client.GetStream();
        NegotiateStream authStream = new NegotiateStream(clientStream);
        // Request authentication for the client only (no mutual authentication).
        // Authenicate using the client's default credetials.
        // Permit the server to impersonate the client to access resources on the server only.
        // Request that data be transmitted using encryption and data signing.
        authStream.AuthenticateAsClient(
             (NetworkCredential) CredentialCache.DefaultCredentials,
             "",
             ProtectionLevel.EncryptAndSign,
             TokenImpersonationLevel.Impersonation);
        DisplayAuthenticationProperties(authStream);
        DisplayStreamProperties(authStream);
        if (authStream.CanWrite)
        {
             // Encode the test data into a byte array.
            byte[] message = System.Text.Encoding.UTF8.GetBytes("Hello from the client.");
            authStream.Write(message, 0, message.Length);
            authStream.Flush();
            Console.WriteLine("Sent {0} bytes.", message.Length);
        }
        // Close the client connection.
        authStream.Close();
        Console.WriteLine("Client closed.");
}

注解

如果启用了加密、签名或加密和签名，此方法将从缓冲区读取数据，对数据进行加密、签名或加密并签名，并使用基础流传输数据。 如果没有使用数据加密或签名等安全服务，则此方法将在基础流上调用 Write 。

此方法在写入操作完成时阻止。 若要防止在操作完成时阻塞，请使用 WriteAsync 方法。

在成功进行身份验证之前，无法调用此方法。 若要进行身份验证，请调用 、AuthenticateAsClientAsync、、BeginAuthenticateAsClientAuthenticateAsServer、 AuthenticateAsServerAsync或 BeginAuthenticateAsServer 方法之AuthenticateAsClient一。

类 NegotiateStream 不支持多个同时写入操作。 如果在另一个写入操作已在同一流上执行时尝试启动写入操作， NotSupportedException 则会引发异常。