Login.OnLoggedIn(EventArgs) 方法

  • 参考

定义

命名空间:
System.Web.UI.WebControls
程序集:
System.Web.dll

在用户登录到网站并已进行身份验证后引发 LoggedIn 事件。

protected:
 virtual void OnLoggedIn(EventArgs ^ e);
protected virtual void OnLoggedIn (EventArgs e);
abstract member OnLoggedIn : EventArgs -> unit
override this.OnLoggedIn : EventArgs -> unit
Protected Overridable Sub OnLoggedIn (e As EventArgs)

参数

e
EventArgs

包含事件数据的 EventArgs。

示例

下面的代码示例使用 LoggedIn 事件调用一个特定于站点的方法，该方法保留用户登录记录。

<%@ page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
// This custom Login control uses a site-specific method
// to record the current date and time when users are 
// authenticated at the site.

class CustomLogin : Login
{
    private void SiteSpecificUserLoggingMethod(string UserName)
    {
        // Insert code to record the current date and time
        // when this user was authenticated at the site.
    }
    
    override protected void OnLoggedIn(EventArgs e)
    {
        SiteSpecificUserLoggingMethod(UserName);
    }
}
    // Add the custom login control to the page.
    void Page_Load(object sender, EventArgs e) 
    {
        CustomLogin loginControl = new CustomLogin();
        loginControl.ID = "loginControl";
        Placeholder1.Controls.Add(loginControl);
    }

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
        <form id="Form1" runat="server">
            <asp:placeholder id="Placeholder1" runat="server"></asp:placeholder>
        </form>
    </body>
</html>

<%@ page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    ' This custom Login control uses a site-specific method
    ' to record the current date and time when users are 
    ' authenticated at the site.
    Class CustomLogin
        Inherits Login
        
        Private Sub SiteSpecificUserLoggingMethod(ByVal UserName As String)
            ' Insert code to record the current date and time
            ' when this user was authenticated at the site.
        End Sub
        
        Overrides Protected Sub OnLoggedIn(ByVal e As EventArgs)
            SiteSpecificUserLoggingMethod(UserName)
        End Sub
    End Class
    
    ' Add the custom login control to the page.
    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        Dim loginControl As New CustomLogin

        loginControl.ID = "loginControl"

        PlaceHolder1.Controls.Add(loginControl)
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
    <asp:placeholder id="Placeholder1" runat="Server"></asp:placeholder>
</form>
</body>
</html>

注解

OnLoggedIn 方法引发 LoggedIn 事件。 在 LoggedIn 对用户进行身份验证后，使用 事件提供其他处理，例如访问每用户数据。

引发事件时，将通过委托调用事件处理程序。 有关详细信息，请参阅 处理和引发事件。

OnLoggedIn 方法还允许派生类对事件进行处理而不必附加委托。 这是在派生类中处理事件的首选技术。

继承者说明

在派生类中重写 OnLoggedIn(EventArgs) 时，一定要调用基类的 OnLoggedIn(EventArgs) 方法，以便已注册的委托对事件进行接收。

适用于

另请参阅