Question

我在ListView中有一个DropDownList .. 我想在点击命令时获取数据。这是我的代码..

protected void ListView2_ItemCommand(object sender, ListViewCommandEventArgs e){

string shipmethod = ((DropDownList)e.Item.FindControl("ShippingComapnyDDL")).SelectedValue;

}

但它总是返回null值.. 我谷歌搜索大约3个小时，并尝试了很多功能.. 但仍然无法解决这个错误..

请帮帮我们，

更新这是我的aspx页面

 <asp:DropDownList ID="ShippingComapnyDDL"  runat="server" SelectedValue='<%# Eval("ShippingCompany") %>'>
<asp:ListItem Text="" Value=""></asp:ListItem>
<asp:ListItem Text="FedEx" Value="FedEx"></asp:ListItem>
<asp:ListItem Text="UPS" Value="UPS"></asp:ListItem>
<asp:ListItem Text="Other" Value="Other"></asp:ListItem>
</asp:DropDownList>

Answer 1

您是否设置了标题？尝试

    if(e.Item.ItemIndex!=-1)
{
     string shipmethod = ((DropDownList)e.Item.FindControl("ShippingComapnyDDL")).SelectedValue; 
}

if not working then try     
string shipmethod = (e.Item.FindControl("ShippingComapnyDDL") as DropDownList).SelectedValue;

Answer 2

试试这个：

  DropDownList ddl = (DropDownList)e.Item.FindControl("ShippingComapnyDDL");
  if (ddl != null)
  {
       //code here
  }

Answer 3

请尝试

<%#DataBinder.Eval(Container.DataItem,"ShippingCompany")%>

而不是

<%#Eval("ShippingCompany")%>

有关详细信息：

http://aspadvice.com/blogs/joteke/archive/2008/08/24/Is-_2200_Databinding-methods-such-as-Eval_280029002C00_-XPath_280029002C00_-and-Bind_28002900_-can-only-be-used-in-the-context-of-a-databound-control_2E002200_-causing-you-grief_3F00_.aspx

如何从ListView中的DropDownList获取值？

3 个答案: