AuthenticationSchemeSelector Delegate
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AuthenticationSchemeSelector Delegate


Selects the authentication scheme for an HttpListener instance.

Namespace:   System.Net
Assembly:  System (in System.dll)

public delegate AuthenticationSchemes AuthenticationSchemeSelector(
	HttpListenerRequest httpRequest


Type: System.Net.HttpListenerRequest

The HttpListenerRequest instance for which to select an authentication scheme.

Return Value

Type: System.Net.AuthenticationSchemes

One of the AuthenticationSchemes values that indicates the method of authentication to use for the specified client request.

Delegates of this type are used by HttpListener instances to select an authentication scheme based on the characteristics of a request.

An AuthenticationSchemeSelector delegate is passed an HttpListenerRequest object for each incoming request that has not provided authentication information. The method invoked by the delegate uses the HttpListenerRequest object and any other available information to decide which authentication scheme to require. The delegate is specified by using the AuthenticationSchemeSelectorDelegate property.

Legacy Code Example

The following example uses an instance of this type to set the AuthenticationSchemeSelectorDelegate property.

// Set up a listener.
HttpListener listener = new HttpListener();
HttpListenerPrefixCollection prefixes = listener.Prefixes;

// Specify the authentication delegate.
listener.AuthenticationSchemeSelectorDelegate = 
    new AuthenticationSchemeSelector (AuthenticationSchemeForClient);

// Start listening for requests and process them 
// synchronously.

The following example shows the implementation of the method invoked by the AuthenticationSchemeSelector delegate in the previous example.

static AuthenticationSchemes AuthenticationSchemeForClient(HttpListenerRequest request)
    Console.WriteLine("Client authentication protocol selection in progress...");
    // Do not authenticate local machine requests.
    if (request.RemoteEndPoint.Address.Equals (IPAddress.Loopback))
        return AuthenticationSchemes.None;
        return AuthenticationSchemes.IntegratedWindowsAuthentication;

.NET Framework
Available since 2.0
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