'RequiredFieldValidator'引用的自定義控件無法驗證

問題：如何正確地擴展自定義控件以使用RequiredFieldValidator？我讀過this，但試圖實施它並沒有解決我的問題。這是我想出迄今：'RequiredFieldValidator'引用的自定義控件無法驗證

<%@ 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>

後面的代碼：

[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; } 
     } 
}

加載這個頁面給了我以下錯誤：

控制「SelectAgreement」通過引用'RequiredFieldValidator'的ControlToValidate屬性無法驗證。

堆棧跟蹤：

[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

來源

2011-05-12 Soroush Hakami

你的代碼看起來我的權利。我得到這個問題有同樣的問題，除了我錯過了'ValidationPropertyAttribute'。只要我添加了_（我的屬性是隻讀的並返回'int'，作爲比較）_它按預期工作。 – JMD 2016-04-12 20:11:14