IAuthenticationModule.PreAuthenticate(WebRequest, ICredentials) 方法

定义

命名空间:

System.Net

程序集:

System.Net.Requests.dll

为对服务器的的身份验证请求返回 Authorization 类的一个实例。

public:
 System::Net::Authorization ^ PreAuthenticate(System::Net::WebRequest ^ request, System::Net::ICredentials ^ credentials);

public System.Net.Authorization? PreAuthenticate (System.Net.WebRequest request, System.Net.ICredentials credentials);

abstract member PreAuthenticate : System.Net.WebRequest * System.Net.ICredentials -> System.Net.Authorization

Public Function PreAuthenticate (request As WebRequest, credentials As ICredentials) As Authorization

参数

request

WebRequest

与身份验证请求关联的 WebRequest 实例。

credentials

ICredentials

与身份验证请求关联的凭据。

返回

Authorization

包含有关请求的授权消息的 Authorization 实例。

示例

下面的示例显示如何使用 PreAuthenticate 方法。 有关完整示例， AuthenticationManager 请参阅 类。

// The PreAuthenticate method specifies if the authentication implemented
// by this class allows pre-authentication.
// Even if you do not use it, this method must be implemented to obey to the rules
// of interface implemebtation.
// In this case it always returns null.
virtual Authorization^ PreAuthenticate( WebRequest^ request, ICredentials^ credentials )
{
   return nullptr;
}

// The PreAuthenticate method specifies whether the authentication implemented
// by this class allows pre-authentication.
// Even if you do not use it, this method must be implemented to obey to the rules
// of interface implementation.
// In this case it always returns null.
public Authorization PreAuthenticate(WebRequest request, ICredentials credentials)
{
  return null;
}

' The PreAuthenticate method specifies whether the authentication implemented 
' by this class allows pre-authentication. 
' Even if you do not use it, this method must be implemented to obey to the rules 
' of interface implementation.
' In this case it always returns null. 
Public Function PreAuthenticate(ByVal request As WebRequest, ByVal credentials As ICredentials) As Authorization _
    Implements IAuthenticationModule.PreAuthenticate

  Return Nothing
End Function 'PreAuthenticate

注解

CanPreAuthenticate当 属性为 true时，PreAuthenticate该方法将返回包含身份验证消息的 类的Authorization实例。