如何测试ASP.NET成员资格密码是否符合配置的复杂性要求？

我有一个ASP.NET页面,允许管理员更改用户的密码.由于管理员不知道用户的密码,我使用以下内容:

MembershipUser member = Membership.GetUser(_usernameTextBox.Text);
member.ChangePassword(member.ResetPassword(), _passNewTextBox.Text);

- 正如这个SO问题所描述的那样.

如果新密码不符合web.config文件中配置的复杂性要求,则密码将被重置,但不会更改为所需的密码.如果新密码不符合复杂性要求,则密码不应发生任何变化.

是否有一种简单的方法可以根据复杂性要求测试新密码？

/// 

/// Checks password complexity requirements for the actual membership provider
/// 
/// password to check
/// true if the password meets the req. complexity
static public bool CheckPasswordComplexity(string password)
{
    return CheckPasswordComplexity(Membership.Provider, password);
}


/// 

/// Checks password complexity requirements for the given membership provider
/// 
/// membership provider
/// password to check
/// true if the password meets the req. complexity
static public bool CheckPasswordComplexity(MembershipProvider membershipProvider, string password)
{
    if (string.IsNullOrEmpty(password)) return false;
    if (password.Length < membershipProvider.MinRequiredPasswordLength) return false;
    int nonAlnumCount = 0;
    for (int i = 0; i < password.Length; i++)
    {
        if (!char.IsLetterOrDigit(password, i)) nonAlnumCount++;
    }
    if (nonAlnumCount < membershipProvider.MinRequiredNonAlphanumericCharacters) return false;
    if (!string.IsNullOrEmpty(membershipProvider.PasswordStrengthRegularExpression) &&
        !Regex.IsMatch(password, membershipProvider.PasswordStrengthRegularExpression))
    {
        return false;
    }
    return true;
}

您可以使用以下属性来测试密码:

Membership.PasswordStrengthRegularExpression

Membership.MinRequiredPasswordLength

Membership.MinRequiredNonAlphanumericCharacters

请注意,如果尚未在web.config文件中配置,则PasswordStrengthRegularExpression属性将为空字符串.

有关正则表达式匹配的信息,请参阅Regex.IsMatch(String)上的MSDN参考

*感谢Matt的有益评论.