更改密码控制不起作用

我目前正在使用c#在。net中做一个应用程序，我想使用更改密码控件。

问题是……我总是收到"密码不正确或新密码无效"的错误提示。新密码长度最小:1。所需的非字母数字字符:0。"

即使我在我的web.config中提供了正确的密码参数并设置了(minRequiredPasswordLength="1" minRequiredNonalphanumericCharacters="0")在membership provider .

<asp:ChangePassword ID="ChangePassword1" runat="server" BackColor="#EFF3FB" BorderColor="#B5C7DE"
    BorderPadding="4" BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana"
    Font-Size="0.8em" ForeColor="#333333" 
    ChangePasswordButtonText="Change" 
    ChangePasswordTitleText="Password change"
    ConfirmNewPasswordLabelText="Retype new password:" 
    NewPasswordLabelText="New Password:">
</asp:ChangePassword>

我正在实现我自己的MembershipProvider:

public class MyMembershipProvider : MembershipProvider 
{
    ...
    public override int MinRequiredNonAlphanumericCharacters
    {
        get
        {
            return 0;
        }
    }
    ...
}

web . config:

<membership defaultProvider="MyMembershipProvider" userIsOnlineTimeWindow="15">
  <providers>
    <add name="MyMembershipProvider"
      type="My.Security.BsAsMembershipProvider"
      enablePasswordRetrieval="true"
      enablePasswordReset="true"
      requiresQuestionAndAnswer="false"
      applicationName="MyApp"
      requiresUniqueEmail="true"
      passwordFormat="Clear"
      passwordStrengthRegularExpression=""
      minRequiredNonalphanumericCharacters="0"
      description="My custom membership provider"
    />
  </providers>
</membership>

任何想法?谢谢。

public class MyMembershipUser : MembershipUser
{
    public MyMembershipUser()
    {
    }
    public MyMembershipUser(string username)
        : base("MyMembershipProvider", username, null, "", "", "", true, true, DateTime.Today, DateTime.Today, DateTime.Today, DateTime.Today, DateTime.Today)
    {
    }
    public override bool ChangePassword(string oldPassword, string newPassword)        
    {
        //Do something
    }
}