更改中继器内部的 WebControl ID

发布于 2024-07-21 07:22:49 字数 614 浏览 9 评论 0原文

<ItemTemplate>
    <asp:Label runat="server"><%#DataBinder.Eval(Container.DataItem, "Question")%></asp:Label>
    <asp:DropDownList runat="server" id="<%#DataBinder.Eval(Container.DataItem, "QuestionID")%>">>
        <asp:ListItem value="1" text="Yes" />
        <asp:ListItem value="0" text="No" />
    </asp:DropDownList>
<ItemTemplate>

这大致就是我想要做的。显然，实现是错误的，但我找不到任何关于如何在实践中实现这一点的信息。任何帮助表示赞赏。

编辑：我想要做的正是为此中继器中的每个项目添加一个 DropDownList，并在提交表单后，使用每个是/否答案的 ID 输入到数据库中。我使用的 SqlDataReader 有两个字段：问题内容和问题 ID。

原文

<ItemTemplate>
    <asp:Label runat="server"><%#DataBinder.Eval(Container.DataItem, "Question")%></asp:Label>
    <asp:DropDownList runat="server" id="<%#DataBinder.Eval(Container.DataItem, "QuestionID")%>">>
        <asp:ListItem value="1" text="Yes" />
        <asp:ListItem value="0" text="No" />
    </asp:DropDownList>
<ItemTemplate>

This is roughly what I'm trying to do. Obviously, the implementation is faulty, but I can't find any information on how I'd go about this in practice. Any help is appreciated.

Edit: What I'm trying to do exactly is add a DropDownList for each item in this Repeater, and upon submission of the form, use the ID's of each Yes/No answer to input into a database. The SqlDataReader that I'm using has two fields: The question content and the questionID.

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无所谓啦 2024-07-28 07:22:49

我认为您最好使用中继器内对 ID 的内置支持。如果目标是为其分配一个 ID，以便在绑定数据后轻松找到正确的控件，您可以尝试如下操作：

<asp:Repeater ID="Repeater1" runat="server>
    <ItemTemplate>
        <asp:Label ID="QuestionID" Visible="False" Runat="server"><%#DataBinder.Eval(Container.DataItem, "FieldContent")%></asp:Label>
        <asp:DropDownList ID="MyDropDownList" Runat="server"></asp:DropDownList>
    </ItemTemplate>
</asp:Repeater>

然后，在代码中，您可以循环遍历 Repeater 中的项目，直到找到标签您正在寻找：

foreach (RepeaterItem curItem in Repeater1.Items)
{
    // Due to the way a Repeater works, these two controls are linked together.  The questionID
    // label that is found is in the same RepeaterItem as the DropDownList (and any other controls
    // you might find using curRow.FindControl)
    var questionID = curRow.FindControl("QuestionID") as Label;
    var myDropDownList = curRow.FindControl("MyDropDownList") as DropDownList;
}

Repeater 基本上由 RepeaterItems 的集合组成。 RepeaterItems 使用 ItemTemplate 标签指定。每个 RepeaterItem 都有自己的一组控件，根据 Repeater 的本质，这些控件彼此关联。

假设您正在从数据库中提取中继器数据。每个 Repeater 项代表查询结果中单独行的数据。因此，如果将 QuestionID 分配给标签，将 QuestionName 分配给 DropDownList，标签中的 ID 将与下拉列表中的名称匹配。

I think you'd be better off using the built in support for IDs inside a Repeater. If the goal is to assign it an ID to make it easy to find the proper control after the data has been bound you might try something like this:

<asp:Repeater ID="Repeater1" runat="server>
    <ItemTemplate>
        <asp:Label ID="QuestionID" Visible="False" Runat="server"><%#DataBinder.Eval(Container.DataItem, "FieldContent")%></asp:Label>
        <asp:DropDownList ID="MyDropDownList" Runat="server"></asp:DropDownList>
    </ItemTemplate>
</asp:Repeater>

Then, in your code you can loop through the items in the Repeater until you find the label you're looking for:

foreach (RepeaterItem curItem in Repeater1.Items)
{
    // Due to the way a Repeater works, these two controls are linked together.  The questionID
    // label that is found is in the same RepeaterItem as the DropDownList (and any other controls
    // you might find using curRow.FindControl)
    var questionID = curRow.FindControl("QuestionID") as Label;
    var myDropDownList = curRow.FindControl("MyDropDownList") as DropDownList;
}

A Repeater basically consists of a collection of RepeaterItems. The RepeaterItems are specified using the ItemTemplate tag. Each RepeaterItem has its own set of controls that are, by the very nature of a Repeater, associated with each other.

Say you're pulling the Repeater data from a database. Each Repeater item represents data from an individual row in the query results. So if you assign the QuestionID to a label and the QuestionName to a DropDownList, the ID in the label would match up with the name in drop down.

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