設置頁面中的CustomValidator的ControlToValidate爲USercontrol內的文本框，以顯示ValidatorCalloutExtender消息

Question

我在這個頁面中註冊了ASP.net和UserControl中的頁面。

用戶控件包含在文本框中有效日期的texbox，ajax calendarextender和rangeValidator。

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="DatePicker.ascx.cs" 
Inherits="Root_Webspace.WebControls.DatePicker" %> 


<table> 
<tr> 
    <td > 
     <asp:RangeValidator ID="rvDate" runat="server" Text="!" ErrorMessage="Message..." ControlToValidate="txtDate" 
      Type="Date" ></asp:RangeValidator> 
     <ajx:ValidatorCalloutExtender ID="vcalSaleDateRange" runat="server" TargetControlID="rvDate"> 
            </ajx:ValidatorCalloutExtender> 
    </td> 
    <td > 
     <asp:TextBox ID="txtDate" runat="server"></asp:TextBox> 
    </td> 
    <td> 
     <asp:ImageButton ID="imgbtnDate" runat="server" CausesValidation="false" ImageUrl="~/App_Themes/Default/Images/icon-calendar.gif" /> 
     <ajx:CalendarExtender ID="cextDate" runat="server" PopupButtonID="imgbtnDate" 
             TargetControlID="txtDate"> 
     </ajx:CalendarExtender> 
    </td> 
</tr> 
</table> 

後面的代碼：

public TextBox TxtDate 
    { 
     get { return txtDate; } 
    } 

該頁面包含該用戶的控制和的CustomValidator。 有了這個CustomValidator，我想將他的ControlToValidate設置爲UserControl textDate。

後面

protected void btnSend_Click(object sender, EventArgs e) 
    { 
     if (Page.IsValid) 
     { 
      //Do Something 
     } 
    } 

    protected void cvalDate_ServerValidate(object source, ServerValidateEventArgs args) 
    { 
     cvalDate.ErrorMessage = string.Empty; 
     args.IsValid = true; 
     if (!IsDate(this.FromDatePicker.TxtDate.Text)) 
      cvalDate.ErrorMessage = Root.Resources.WebMessages.INVALIDDATE; 
     else if (!string.IsNullOrEmpty(FromDatePicker.TxtDate.Text) && DateTime.Parse(FromDatePicker.TxtDate.Text) > DateTime.Now) 
      cvalDate.ErrorMessage = Root.Resources.WebMessages.BIGGERTHAN; 


     args.IsValid = string.IsNullOrEmpty(cvalDate.ErrorMessage); 
    } 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!Page.IsPostBack) 
     { 
      cvalDate.ControlToValidate = FromDatePicker.TxtDate.ID; 
     } 
    } 

錯誤=>的InnerException型

<%@ Page Title="" Language="C#" MasterPageFile="~/Masterpages/Default.Master" AutoEventWireup="true" 
CodeBehind="Test.aspx.cs" Inherits="Root_Webspace.Test" UICulture="auto" Culture="auto" 
Async="true" %> 

<%@ Register Src="~/WebControls/DatePicker.ascx" TagName="DatePicker" TagPrefix="uc1" %> 
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server"> 
</asp:Content> 
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server"> 

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> 
    <Triggers> 
     <asp:AsyncPostBackTrigger ControlID="btnSend" EventName="Click" /> 
     <asp:AsyncPostBackTrigger ControlID="btnCancel" EventName="Click" /> 
    </Triggers> 
    <ContentTemplate> 
     <div> 
      <asp:CustomValidator ID="cvalDate" runat="server" ControlToValidate="How to set with usercontrol txtDate ???? " 
       Display="Dynamic" Text="!" OnServerValidate="cvalDate_ServerValidate" ValidateEmptyText="true"> </asp:CustomValidator> 
      <ajx:ValidatorCalloutExtender ID="vcalDateBris" runat="server" TargetControlID="cvalDate"> 
      </ajx:ValidatorCalloutExtender> 
      <uc1:DatePicker ID="FromDatePicker" runat="server" /> 
     </div> 
      </ContentTemplate> 
</asp:UpdatePanel> 
<div> 
    <div class="buttonzone"> 
     <div id="idButtons" style="margin-right: 5px;"> 
      <asp:Button ID="btnSend" runat="server" TabIndex="10" Text="Send" Width="85px" meta:resourcekey="btnSend" 
       OnClick="btnSend_Click" /> 
      <asp:Button ID="btnCancel" runat="server" CausesValidation="false" TabIndex="11" 
       Text="Cancel" OnClick="btnCancel_Click" Width="85px" meta:resourcekey="btnCancel" /> 
     </div> 
    </div> 
</div> 
</asp:Content> 

代碼信息：System.Web.HttpException無法找到控制ID 'txtDate' 由 'cvalDate' 的 '的ControlToValidate' 屬性引用。

當我改變到：cvalDate.ControlToValidate = FromDatePicker.TxtDate.ClientID;

Error => InnerException類型：System.Web.HttpException無法找到由'cvalDate'的'ControlToValidate'屬性引用的控件ID'ctl00_ContentPlaceHolder1_FromDatePicker_txtDate'。

如果我不設置cvalDate.controlToValidate，該vcalDateBris（ValidatorCalloutExtender）將當它必須顯示無效日期味精失敗，因爲這ValidatorCalloutExtender鏈接的CustomValidator通過的TargetControlID其中的CustomValidator沒有的ControlToValidate控制設定。 那麼如何將頁面中的CustomValidator的ControlToValidate設置爲FromDatePicker（USerControl）內部的txtDate，以便在ValidatorCalloutExtender中顯示消息。

任何想法？

問候。

Answer 1

ControlToValidate="FromDatePicker$txtDate"