Question

问题：如何正确扩展自定义控件以使用RequiredFieldValidator？我已阅读this，但尝试实施它并没有为我解决问题。这是我到目前为止所提出的：

 <%@ Register src="DynamicGenerator/Controls/ReferenceControl.ascx" tagname="ReferenceControl" tagprefix="uc1" %>
    <uc1:ReferenceControl ID="SelectAgreement" runat="server" />
    <asp:RequiredFieldValidator ID="RequiredFieldValidator" ControlToValidate="SelectAgreement" runat="server" ErrorMessage="Select an agreement!"></asp:RequiredFieldValidator>

代码背后：

[ValidationProperty("ConceptDefinitionId")]
public partial class ReferenceSelector : System.Web.UI.UserControl, IReference
{
   //lots of other stuff
 public string ConceptDefinitionId
        {
            get { return ReferenceControl.ConceptDefinitionId ?? ""; }
            set { ReferenceControl.ConceptDefinitionId = value; }
        }
}

加载此页面会出现以下错误：

无法验证由'RequiredFieldValidator'的ControlToValidate属性引用的控件'SelectAgreement'。

堆栈跟踪：

[HttpException (0x80004005): Control 'SelectAgreement' referenced by the ControlToValidate property of 'RequiredFieldValidator' cannot be validated.]
   System.Web.UI.WebControls.BaseValidator.CheckControlValidationProperty(String name, String propertyName) +8739685
   System.Web.UI.WebControls.BaseValidator.ControlPropertiesValid() +40
   System.Web.UI.WebControls.BaseValidator.get_PropertiesValid() +21
   System.Web.UI.WebControls.BaseValidator.OnPreRender(EventArgs e) +27
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

Answer 1

您需要将RequiredFieldValidator置于UserControl中并验证特定控件，如TextBox或DropDown，因为验证程序仅允许在同一命名容器中，在您的情况下UserControl是一个不同的容器，所以这不起作用。

另一种方法是使用ValidationPropertyAttribute

无法验证'RequiredFieldValidator'引用的自定义控件

1 个答案: