中继器内部的asp.net绑定下拉列表
本文关键字:绑定 下拉列表 net asp 内部 中继器 | 更新日期: 2023-09-27 18:04:42
我想做的是绑定和下拉列表内的中继器,但我没有使它。我在标记行处得到以下错误:System.NullReferenceException。如有任何帮助,我将不胜感激。
后端: protected void shoeRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
FixbayDBDataContext db = new FixbayDBDataContext();
var colors = from c in db.ColorTbls select new { ColorID = c.ColorID, ColorName = c.ColorName, };
DropDownList ddl = (DropDownList)e.Item.FindControl("colorList1");
ddl.DataSource = colors; //ERROR LINE
ddl.DataTextField = "ColorName";
ddl.DataValueField = "ColorName";
}
前端:<ajaxToolkit:TabPanel ID="TabPanel5" runat="server">
<HeaderTemplate>Show Shoes</HeaderTemplate>
<ContentTemplate runat="server">
<asp:Repeater ID="shoeRepeater" OnItemCreated="shoeRepeater_ItemDataBound" runat="server">
<HeaderTemplate></HeaderTemplate>
<ItemTemplate>
<table border="1" style="border-color:#ff9900; width:400px; font-weight:bold; font-family:'Oswald', Arial, sans-serif;">
<tr>
<td rowspan="6" style="width:150px; height:150px;">
<image src="shoeImages/<%#DataBinder.Eval(Container.DataItem,"ImagePath") %>"></image>
</td>
</tr>
<tr>
<td>
<%#DataBinder.Eval(Container.DataItem,"BrandName") %> <%#DataBinder.Eval(Container.DataItem,"ModelName") %>
</td>
</tr>
<tr>
<td>
Price: $<%#DataBinder.Eval(Container.DataItem,"Price") %>
</td>
</tr>
<tr>
<td>
Size: <%#DataBinder.Eval(Container.DataItem,"Size") %>
</td>
</tr>
<tr>
<td>
<asp:DropDownList ID="colorList1" onchange="get(this)" runat="server">
</asp:DropDownList>
Color: <%#DataBinder.Eval(Container.DataItem,"PrimaryColor") %> - <%#DataBinder.Eval(Container.DataItem,"SecondaryColor") %>
</td>
</tr>
<tr>
<td>
Quantity: <%#DataBinder.Eval(Container.DataItem,"Quantity") %>
</td>
</tr>
</table>
</ItemTemplate>
<FooterTemplate></FooterTemplate>
</asp:Repeater>
</ContentTemplate>
</ajaxToolkit:TabPanel>
您订阅了错误的事件:
OnItemCreated="shoeRepeater_ItemDataBound"
应该是
OnItemDataBound="shoeRepeater_ItemDataBound"
解决方案
protected void shoeRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
FixbayDBDataContext db = new FixbayDBDataContext();
var colors = from c in db.ColorTbls select new { ColorID = c.ColorID, ColorName = c.ColorName, };
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DropDownList ddl = (DropDownList)e.Item.FindControl("colorList1");
ddl.DataSource = colors;//Or any other datasource.
ddl.DataTextField = "ColorName";
ddl.DataValueField = "ColorName";
ddl.DataBind();
}
}