SocketsHttpHandler.ConnectCallback Propriété

Définition

Obtient ou définit un rappel personnalisé utilisé pour ouvrir de nouvelles connexions.

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, set
Public Property ConnectCallback As Func(Of SocketsHttpConnectionContext, CancellationToken, ValueTask(Of Stream))

Valeur de propriété

Méthode de rappel pour créer un flux.

Exemples

L’exemple de code suivant définit TCP KeepAlive sur le sous-jacent Socket.

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} ");
    }
}

S’applique à