AuthenticationService.Authenticating 事件

定义

命名空间:

System.Web.ApplicationServices

程序集:

System.Web.Extensions.dll

当验证用户凭据时发生。

public:
 static event EventHandler<System::Web::ApplicationServices::AuthenticatingEventArgs ^> ^ Authenticating;

public static event EventHandler<System.Web.ApplicationServices.AuthenticatingEventArgs> Authenticating;

member this.Authenticating : EventHandler<System.Web.ApplicationServices.AuthenticatingEventArgs> 

Public Shared Custom Event Authenticating As EventHandler(Of AuthenticatingEventArgs) 

事件类型

EventHandler<AuthenticatingEventArgs>

示例

以下示例演示如何在 Global.asax 文件的 方法中Application_Start为 Authenticating 事件绑定事件处理程序。

void Application_Start(object sender, EventArgs e) 
{
    System.Web.ApplicationServices.AuthenticationService.Authenticating += 
        new EventHandler<System.Web.ApplicationServices.AuthenticatingEventArgs>(AuthenticationService_Authenticating);

}

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    AddHandler System.Web.ApplicationServices.AuthenticationService.Authenticating, _
      AddressOf Me.AuthenticationService_Authenticating
End Sub

以下示例演示 Global.asax 文件中 事件的事件处理程序 Authenticating 。 事件处理程序从 CustomCredential 属性中读取两个身份验证值，并将其与用户名和密码一起传递给名为 的 StudentAuthentication自定义身份验证类。

void AuthenticationService_Authenticating(object sender, System.Web.ApplicationServices.AuthenticatingEventArgs e)
{
    string studentid = String.Empty;
    string answer = String.Empty;

    string[] credentials =
        e.CustomCredential.Split(new char[] { ',' });
    if (credentials.Length > 0)
    {
        studentid = credentials[0];
        if (credentials.Length > 1)
        {
            answer = credentials[1];
        }
    }

    try
    {
        e.Authenticated =
            StudentAuthentication.ValidateStudentCredentials
            (e.UserName, e.Password, studentid, answer);
    }
    catch (ArgumentNullException ex)
    {
        e.Authenticated = false;
    }

    e.AuthenticationIsComplete = true;
}

Sub AuthenticationService_Authenticating _
   (ByVal sender As Object, _
    ByVal e As System.Web.ApplicationServices.AuthenticatingEventArgs)
    Dim studentid As String = String.Empty
    Dim answer As String = String.Empty

    Dim credentials As String() = _
         e.CustomCredential.Split(New Char() {","c})
    If (credentials.Length > 0) Then
        studentid = credentials(0)
        If (credentials.Length > 1) Then
            answer = credentials(1)
        End If
    End If

    Try
        e.Authenticated = _
            StudentAuthentication.ValidateStudentCredentials _
            (e.Username, e.Password, studentid, answer)
    Catch ex As ArgumentNullException
        e.Authenticated = False
    End Try
    

    e.AuthenticationIsComplete = True
End Sub

注解

验证 Authenticating 用户凭据时会引发 该事件。 为事件创建事件处理程序， Authenticating 以自定义验证用户凭据的方式。

另请参阅

• AuthenticatingEventArgs
• Windows Communication Foundation 身份验证服务概述