c# – 基类包含字段,但类型与控件类型不兼容

我以同样的方式完成了许多自定义控件,但是Hell这个错误让我很难.我有一个Web应用程序项目与App_Code目录中的下列类别在web.config中的类中的控件的tagprefix引用.现在我该怎么做？

Web.Config中

<system.web>
    <pages>
        <controls>
            <add namespace="web.App_Code" tagPrefix="CControls"/>...

标记

<form id="form1" runat="server">
<div>
    <CControls:CustomLabelControl runat="server" OnClickText="Welcome" ID="lbl">
    </CControls:CustomLabelControl>
</div>
</form>

类文件

namespace web.App_Code
{
    public class CustomLabelControl : Control,IPostBackEventHandler,IPostBackDataHandler
    {
        private string _onClickText;

        public CustomLabelControl()
        {

        }

        public string OnClickText
        {
            get { return _onClickText; }
            set { _onClickText = value; }
        }

        public void RaisePostBackEvent(string eventArgument)
        {
            throw new System.NotImplementedException();
        }


        public bool LoadPostData(string postDataKey,NameValueCollection postCollection)
        {
            throw new System.NotImplementedException();
        }


        public void RaisePostDataChangedEvent()
        {
            throw new System.NotImplementedException();
        }
    }
}

试过这些

> The base class includes the field ‘btnLogin’,but its type (FoodOrder.App_Code.LinkButtonDefault) is not compatible
> http://support.microsoft.com/kb/919284
> The base class includes the field ‘ScriptManager1’,but its type (System.Web.UI.ScriptManager) is not compatible with the type of control (System.Web.UI.ScriptManager)