通过代码隐藏使用asp.net验证控件

Question

我正在尝试使用RequiredFieldValidator验证文本框，并通过代码隐藏在ValidationSummary中显示错误消息，但我无法做到这一点。 我的代码在这里

        if (txtUsrName.Text.Length == 0 || txtUsrAge.Text.Length == 0)
        {
            RequiredFieldValidator req = new RequiredFieldValidator();
            req.ID = "Required";
            req.ControlToValidate = txtUsrName.ID;                                
            req.IsValid = false;
            req.Visible = true;
            req.Enabled = true;                               
            req.ValidationGroup = "ValidationGroup";
            req.ErrorMessage = "Thease are required fields";
            req.InitialValue = "";
            req.Text = "*";

            ValidationSummary valsum = new ValidationSummary();
            ValidationSummaryDisplayMode mode = new ValidationSummaryDisplayMode();
            valsum.ID = "validatesummury";                
            valsum.HeaderText = "please correct the following errors";                
            valsum.DisplayMode = mode;
            valsum.ShowSummary = true;
            valsum.ValidationGroup = "ValidationGroup";
            valsum.Visible = true;                
        }

请帮我解决这个问题

Answer 1

您可以使用Page.Validate() OR Page.Validate("YOUR_VALIDATION_GROUP")然后检查Page.IsValid以检查所有验证器是否有效，对于特殊验证器，您也可以使用YOUR_RequiredFieldValidator.IsValid 'YOUR_RequiredFieldValidator' is one attached to your textbox control

Answer 2

以下是一个类似的问题，可能会为您提供见解：Unobtrusive Validation in Webforms using Data Annotations。数据注释提供了检查类属性的长度，最小值/最大值等的方法。