C#中Repeater控件rptEndorseList当前上下文不存在问题求助

刚接触开发，现有一段读取XML文件的代码，绑定嵌套Repeater控件rptEndorseList时编译器抛出CS0103错误，提示该名称在当前上下文中不存在。以下是后端C#代码和ASPX前端代码：

原C#代码 #

if (objRecord.LicenseHistoryList != null && objRecord.LicenseHistoryList.Length > 0 && txtLicenseOriginallyIssued.Text == "")
{
    rptLicHistory.DataSource = objRecord.LicenseHistoryList;
    rptLicHistory.DataBind();
    foreach(RepeaterItem objItem in rptLicHistory.Items)
    {
        var objHistoryItem = objRecord.LicenseHistoryList[objItem.ItemIndex];
        ((TextBox)objItem.FindControl("txlicenseHistoryType")).Text = objHistoryItem.Type;
        ((TextBox)objItem.FindControl("txlicenseHistoryIssued")).Text = MVRDateToString(objHistoryItem.IssueDate);                
        if (objHistoryItem.EndorsementList != null && objHistoryItem.EndorsementList.Length > 0)
        {
            rptEndorseList.DataSource = objHistoryItem.EndorsementList;   // 错误：CS0103: The name 'rptEndorseList' does not exist in the current context
            rptEndorseList.DataBind();
            foreach(RepeaterItem endorseItems in rptEndorseList.Items)
            {   
                var objEndorseItem = objHistoryItem.EndorsementList[endorseItems.ItemIndex];
                ((TextBox)objItem.FindControl("txtLicenseHistoryEndorement")).Text = objEndorseItem.EndorsementItem;
            }
        }
    }
} 
else
{
    divHistoryList.Visible = false;
    lblHistoryNoData.Visible = true;
}

原ASPX代码 #

<div class="section">
    <h2>License and Permit History</h2>
    <div id="divHistoryList" runat="server">
        <asp:Repeater ID="rptLicHistory" runat="server">
            <ItemTemplate>
                <div style="display:flex;width: 100%;align-items: center;">
                    <div style="width:60px;">License:</div>
                    <div style="width:170px;"><asp:TextBox ID="txlicenseHistoryType" runat="server" style="border:none;"/></div>
                    <div style="width:50px">Issue:</div>
                    <div style="width:110px;"><asp:TextBox ID="txlicenseHistoryIssued" runat="server" style="border:none;"/></div>
                    <div style="width:50px;">Expire:</div>
                </div>
                <div style="display:flex;width: 100%;align-items: center;">
                    <div style="width:228px;"></div>
                    <div style="padding-right:5px;">Class:</div>
                    <div style="flex:1;"><asp:TextBox ID="txLicenseHistoryClass" runat="server" style="border:none"/>                            </div>
                </div>
                <asp:Repeater ID="rptEndorseList" runat="server">
                    <ItemTemplate>
                        <asp:TextBox ID="txtLicenseHistoryEndorement" runat="server" style="border:none"/>                            </div>                                
                    </ItemTemplate>
                    <SeparatorTemplate>
                        <div style="height: 30px;">&nbsp;</div>
                    </SeparatorTemplate>
                </asp:Repeater>
            </ItemTemplate>
            <SeparatorTemplate>
                <div style="height: 30px;">&nbsp;</div>
            </SeparatorTemplate>
        </asp:Repeater>
    </div>
    <asp:Label ID="lblHistoryNoData" runat="server" data-en="<p>No License History Was Returned.</p>" data-es="" Visible="false" />
</div>

问题核心原因 #

rptEndorseList是嵌套在rptLicHistory的ItemTemplate内部的子控件，不属于页面的直接控件集合，因此无法在页面级直接通过名称访问，必须通过父Repeater的RepeaterItem对象去查找。

修正后的C#代码 #

if (objRecord.LicenseHistoryList != null && objRecord.LicenseHistoryList.Length > 0 && txtLicenseOriginallyIssued.Text == "")
{
    rptLicHistory.DataSource = objRecord.LicenseHistoryList;
    rptLicHistory.DataBind();
    foreach(RepeaterItem objItem in rptLicHistory.Items)
    {
        var objHistoryItem = objRecord.LicenseHistoryList[objItem.ItemIndex];
        ((TextBox)objItem.FindControl("txlicenseHistoryType")).Text = objHistoryItem.Type;
        ((TextBox)objItem.FindControl("txlicenseHistoryIssued")).Text = MVRDateToString(objHistoryItem.IssueDate);                
        if (objHistoryItem.EndorsementList != null && objHistoryItem.EndorsementList.Length > 0)
        {
            // 从当前父RepeaterItem中查找子Repeater
            Repeater rptEndorseList = (Repeater)objItem.FindControl("rptEndorseList");
            if(rptEndorseList != null)
            {
                rptEndorseList.DataSource = objHistoryItem.EndorsementList;
                rptEndorseList.DataBind();
                foreach(RepeaterItem endorseItem in rptEndorseList.Items)
                {   
                    var objEndorseItem = objHistoryItem.EndorsementList[endorseItem.ItemIndex];
                    // 从当前子RepeaterItem中查找对应的TextBox（原代码错误使用父Item查找，会导致所有子项覆盖同一个控件值）
                    ((TextBox)endorseItem.FindControl("txtLicenseHistoryEndorement")).Text = objEndorseItem.EndorsementItem;
                }
            }
        }
    }
} 
else
{
    divHistoryList.Visible = false;
    lblHistoryNoData.Visible = true;
}

额外注意事项 #

• 必须添加null判断：防止FindControl找不到控件时触发空引用异常
• 子控件赋值要对应：原代码中用父RepeaterItem查找子Repeater内的TextBox，会导致所有子项修改同一个控件的值，必须改为从子Repeater的Item中查找
• 保持ID拼写一致：确保ASPX中控件ID和后端代码中的拼写、大小写一致（ASP.NET默认不区分大小写，但统一写法可避免潜在问题）

内容的提问来源于stack exchange，提问作者Elcid_91