ChangePassword.ChangingPassword 事件

  • 参考

定义

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

在成员资格提供程序更改用户帐户的密码之前发生。

public:
 event System::Web::UI::WebControls::LoginCancelEventHandler ^ ChangingPassword;
public event System.Web.UI.WebControls.LoginCancelEventHandler ChangingPassword;
member this.ChangingPassword : System.Web.UI.WebControls.LoginCancelEventHandler 
Public Custom Event ChangingPassword As LoginCancelEventHandler

事件类型

LoginCancelEventHandler

示例

下面的代码示例演示如何使用 ASP.NET 页，该页使用 ChangePassword 控件，并包含名为 ChangingPassword的 ChangingPassword 事件的处理程序。 事件处理程序中的代码将 存储在 属性中的 CurrentPassword 旧密码与 存储在 中的 NewPassword新密码进行比较。 如果两个密码相同，则更改密码会失败。

控件 ChangePassword 将 DisplayUserName 属性设置为 true ，使用户能够输入其用户名。 这意味着用户无需登录就可查看页面。

代码示例假定 ASP.NET 网站已配置为使用成员身份和窗体身份验证 ASP.NET，并且已创建名称和密码已知的用户。 有关详细信息，请参阅 如何：实现简单表单身份验证。

<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void Page_Load(Object sender, EventArgs e)
  {
    //Manually register the event-handling methods.
    ChangePassword1.ChangingPassword += new LoginCancelEventHandler(this._ChangingPassword);
  }

  void _ChangingPassword(Object sender, LoginCancelEventArgs e)
  {
    if (ChangePassword1.CurrentPassword.ToString() == ChangePassword1.NewPassword.ToString())
    {
      Message1.Visible = true;
      Message1.Text = "Old password and new password must be different.  Please try again.";
      e.Cancel = true;
    }
    else
    {
      //This line prevents the error showing up after a first failed attempt.
      Message1.Visible = false;
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>ChangePassword including a ChangingPassword event handler</title>
</head>
<body>
  <form id="form1" runat="server">
  <div style="text-align:center">

    <h1>ChangePassword</h1>
    
    <asp:LoginView ID="LoginView1" Runat="server" 
      Visible="true">
      <LoggedInTemplate>
        <asp:LoginName ID="LoginName1" Runat="server" FormatString="You are logged in as {0}." />
        <br />
      </LoggedInTemplate>
      <AnonymousTemplate>
        You are not logged in
      </AnonymousTemplate>
    </asp:LoginView><br />
    
    <asp:ChangePassword ID="ChangePassword1" Runat="server"
      BorderStyle="Solid" 
      BorderWidth="1" 
      CancelDestinationPageUrl="~/Default.aspx" 
      DisplayUserName="true" 
      OnChangingPassword="_ChangingPassword"
      ContinueDestinationPageUrl="~/Default.aspx" >
    </asp:ChangePassword><br />
  
    <asp:Label ID="Message1" Runat="server" ForeColor="Red" /><br />

    <asp:HyperLink ID="HyperLink1" Runat="server" 
      NavigateUrl="~/Default.aspx">
      Home
    </asp:HyperLink>
    
  </div>
  </form>
</body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  Public Sub PageLoad(ByVal Sender As Object, ByVal e As EventArgs)
    'Manually register the event-handling methods.
    AddHandler ChangePassword1.ChangingPassword, AddressOf Me._ChangingPassword
  End Sub

  Public Sub _ChangingPassword(ByVal Sender As Object, ByVal e As LoginCancelEventArgs)
    If (ChangePassword1.CurrentPassword.ToString() = ChangePassword1.NewPassword.ToString) Then
      Message1.Visible = True
      Message1.Text = "Old password and new password must be different.  Please try again."
      e.Cancel = True
    Else
      'This line prevents the error showing up after a first failed attempt.
      Message1.Visible = False
    End If
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>ChangePassword including a ChangingPassword event handler</title>
</head>
<body>
  <form id="form1" runat="server">
  <div style="text-align:center">

    <h1>ChangePassword</h1>
    
    <asp:LoginView ID="LoginView1" Runat="server" 
      Visible="true">
      <LoggedInTemplate>
        <asp:LoginName ID="LoginName1" Runat="server" FormatString="You are logged in as {0}." />
        <br />
      </LoggedInTemplate>
      <AnonymousTemplate>
        You are not logged in
      </AnonymousTemplate>
    </asp:LoginView><br />
    
    <asp:ChangePassword ID="ChangePassword1" Runat="server"
      BorderStyle="Solid" 
      BorderWidth="1" 
      CancelDestinationPageUrl="~/Default.aspx" 
      DisplayUserName="true" 
      OnChangingPassword="_ChangingPassword"
      ContinueDestinationPageUrl="~/Default.aspx" >
    </asp:ChangePassword><br />
  
    <asp:Label ID="Message1" Runat="server" ForeColor="Red" /><br />

    <asp:HyperLink ID="HyperLink1" Runat="server" 
      NavigateUrl="~/Default.aspx">
      Home
    </asp:HyperLink>
    
  </div>
  </form>
</body>
</html>

注解

在 ChangingPassword 调用 属性中指定的 MembershipProvider 成员资格提供程序以更改用户帐户的密码之前引发 事件。

ChangingPassword使用 事件在更改密码之前执行任何必要的处理，例如检查新密码以确保它不在常见密码列表中。 用户的新授权令牌在事件之后 ChangingPassword 、事件之前 ChangedPassword 设置。

ChangingPassword如果事件处理程序确定不应调用成员资格提供程序，则可以通过将 对象的 属性LoginCancelEventArgs设置为 Canceltrue 来取消事件。

有关处理事件的详细信息，请参阅 处理和引发事件。

适用于

另请参阅