ASP.NET自定義驗證控件未顯示錯誤消息

Question

以下代碼用於驗證何時按下表單提交按鈕，但我沒有得到想要的結果。

它應該顯示錯誤消息，但沒有顯示，我在做什么錯？

定制驗證器驗證密碼，它應該根據發生的錯誤來更改錯誤消息：

1. 密碼為空
2. 密碼無效
3. 密碼不匹配

一次只能顯示一個錯誤，因此我在.ascx.cs中編寫了此自定義驗證器：

    protected void cvPasswordValidation_ServerValidate(object source, ServerValidateEventArgs args)
    {

        bool IsPasswordBlank = false;
        bool IsPasswordValid = false;

        cvPasswordValidation.IsValid = false;

        // If password is blank then IsValid is false, show blank password errors.
        if (String.IsNullOrEmpty(args.Value))
        {

            //args.IsValid = false;
            IsPasswordBlank = true;
            //Show blank password error depending on which box is empty.
            if (String.IsNullOrEmpty(txtPassword.Text))
            {
                cvPasswordValidation.ErrorMessage = "You must enter password";
            }
            else
            {
                cvPasswordValidation.ErrorMessage = "You must confirm password";
            }
            cvPasswordValidation.IsValid = false;

        }
        else
        {
            cvPasswordValidation.IsValid = true;
        }

        // If password is not valid format then IsValid is false, show invalid format errors.
        if (!Regex.IsMatch(args.Value, RegexHelper.ValidPassword)) 
        {

            IsPasswordValid = true;
            //Show invalid format errors, if password is not blank
            if (IsPasswordBlank == false)
            {
                cvPasswordValidation.ErrorMessage = "<b>Current password</b> not in correct format. Your password must contain 6 - 12 characters with a combination of numbers and letters.";
            }
            cvPasswordValidation.IsValid = false;
        } 
        else 
        {
            cvPasswordValidation.IsValid = true; 
        } 

        // If passwords do not match then IsValid is false, show do not match errors.
        bool areEqual = String.Equals(txtPassword.Text, txtConfirmPassword.Text, StringComparison.Ordinal);

        if (areEqual == false)
        {

            //Show do not match errors is password is not blank and is not invalid format
            if (IsPasswordBlank == false && IsPasswordValid == false)
            {
                cvPasswordValidation.ErrorMessage = "Your passwords do not match.";
            }
            cvPasswordValidation.IsValid = false;
        }
        else
        {
            cvPasswordValidation.IsValid = true;
        }

    }

和.ascx：

<asp:TextBox runat="server" ID="txtPassword" MaxLength="12" autocomplete="off" TextMode="Password" ValidationGroup="vgOnlineDetails"></asp:TextBox>

<asp:CustomValidator ID="cvPasswordValidation"
                 runat="server"
                 display="Dynamic"
                 OnServerValidate="cvPasswordValidation_ServerValidate"
                 ControlToValidate="txtPassword"
                 ValidationGroup="vgOnlineDetails">
</asp:CustomValidator>

Answer 1

您需要設置ValidateEmptyText = true來驗證空字段。

Answer 2

分配給IsValid屬性后，應使用return 。 根本不指定密碼的情況。 如果您未指定賦值后的return ，則將執行所有三個if語句。 在最后if areEqual變量將是true ，因為兩個空字符串相等和cvPasswordValidation.IsValid = true; 將被執行。 在這種情況下，您的文本框將是有效的。