SocketsHttpHandler.ConnectCallback 属性
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取或设置用于打开新连接的自定义回调。
public:
property Func<System::Net::Http::SocketsHttpConnectionContext ^, System::Threading::CancellationToken, System::Threading::Tasks::ValueTask<System::IO::Stream ^>> ^ ConnectCallback { Func<System::Net::Http::SocketsHttpConnectionContext ^, System::Threading::CancellationToken, System::Threading::Tasks::ValueTask<System::IO::Stream ^>> ^ get(); void set(Func<System::Net::Http::SocketsHttpConnectionContext ^, System::Threading::CancellationToken, System::Threading::Tasks::ValueTask<System::IO::Stream ^>> ^ value); };public Func<System.Net.Http.SocketsHttpConnectionContext,System.Threading.CancellationToken,System.Threading.Tasks.ValueTask<System.IO.Stream>>? ConnectCallback { get; set; }member this.ConnectCallback : Func<System.Net.Http.SocketsHttpConnectionContext, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask<System.IO.Stream>> with get, setPublic Property ConnectCallback As Func(Of SocketsHttpConnectionContext, CancellationToken, ValueTask(Of Stream))属性值
用于创建流的回调方法。
示例
下面的代码示例在基础 Socket上设置 TCPKeepAlive。
static async Task Main()
{
using SocketsHttpHandler handler = new SocketsHttpHandler();
handler.ConnectCallback = async (ctx, ct) =>
{
var s = new Socket(SocketType.Stream, ProtocolType.Tcp) { NoDelay = true };
try
{
s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
s.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveTime, 5);
s.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveInterval, 5);
s.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.TcpKeepAliveRetryCount, 5);
await s.ConnectAsync(ctx.DnsEndPoint, ct);
return new NetworkStream(s, ownsSocket: true);
}
catch
{
s.Dispose();
throw;
}
};
// Create an HttpClient object
using HttpClient client = new HttpClient(handler);
// Call asynchronous network methods in a try/catch block to handle exceptions
try
{
HttpResponseMessage response = await client.GetAsync("https://docs.microsoft.com/");
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
Console.WriteLine($"Read {responseBody.Length} characters");
}
catch (HttpRequestException e)
{
Console.WriteLine("\nException Caught!");
Console.WriteLine($"Message: {e.Message} ");
}
}
