Asp.Net自定義驗證控件不顯示錯誤消息

Question

以下代碼用於驗證表單提交按鈕何時被命中，但我沒有收到想要的結果。

它應該顯示錯誤消息，但它們沒有被顯示我做錯了什麼？

自定義驗證驗證密碼，它應根據所發生的錯誤更改錯誤信息：

1. 密碼爲空
2. 密碼無效
3. 密碼不匹配

一次只能顯示一個錯誤，所以我在.ascx.cs中編寫了這個自定義validator：

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; 
     } 

    } 

和的.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才能驗證空字段。

Answer 2

你建議立即進行刪除分配到IsValid屬性後使用return。當你根本沒有指定密碼時的情況。如果分配後未指定return，則將執行全部三個if語句。在最後ifareEqual變量將是true，因爲兩個空字符串相等，並且cvPasswordValidation.IsValid = true;將被執行。在這種情況下，你的文本框將是有效的。