asp.net - Repeater中DropDownList的SelectedValue

Question

如何在中继器内设置 dropDownList 的选定项？

在后面的代码中，repeater绑定(bind)到repeaterData DataTable，dropDownList绑定(bind)到dropDownList DataTable。我需要将 DropDownList 的 SelectedValue 属性设置为 repeaterData 表中字段的值。

这是我尝试过的:

<asp:Repeater runat="server" ID="myRepeater>
<ItemTemplate>
    <asp:DropDownList runat="server" CssClass="fullSelect" ID="degree_dropdown"
            AppendDataBoundItems="true" 
            selectedValue='<%#DataBinder.Eval(Container.DataItem,"degreeCode")%>'>
                  <asp:ListItem Text="Select Degree" />
     </asp:DropDownList>
</ItemTemplate>
</asp:Repeater>

填充中继器的代码:

myRepeater.DataSource = myRepeaterData; //myRepeaterData is a datatable
myRepeater.DataBind();

填充下拉列表的代码:

protected void educationPopup_repeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            DropDownList degree_dropdown = e.Item.FindControl("degree_dropdown") as DropDownList;
            if (degree_dropdown != null)
            {
                degree_dropdown.DataSource = degrees; //a datatable
                degree_dropdown.DataTextField = "degree";
                degree_dropdown.DataValueField = "code";
                degree_dropdown.DataBind();
            }
}

Answer 1

你快到了。你只需要投DataItem至DataRowView , 并将其分配给 DropDownList像这样 -

protected void myRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || 
       e.Item.ItemType == ListItemType.AlternatingItem)
    {
        var degree_dropdown = e.Item.FindControl("degree_dropdown") as DropDownList;
        string degreeCode = (string) ((DataRowView) e.Item.DataItem)["degreeCode"];

        if (degree_dropdown != null)
        {
            degree_dropdown.DataSource = degrees; //a datatable
            degree_dropdown.DataTextField = "degree";
            degree_dropdown.DataValueField = "code";
            degree_dropdown.DataBind();

            if (degree_dropdown.Items.FindByValue(degreeCode) != null)
                degree_dropdown.SelectedValue = degreeCode;
        }
    }
}