<asp:DataList ID="DataList1" runat="server" DataKeyField="ID" OnEditCommand="DataList1_Edit">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Province") %>'></asp:Label>
<asp:Button ID="Button1" runat="server" CommandName="edit" Text="编辑" />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Province") %>'></asp:TextBox>
</EditItemTemplate>
</asp:DataList>注意上边使用的是TextBox，但有时所需更改的数据是某个序列中的一个成员，此时我们就应使用DropDownList控件，如下所示：
<asp:DataList ID="DataList1" runat="server" DataKeyField="ID" OnEditCommand="DataList1_Edit">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Province") %>'></asp:Label>
<asp:Button ID="Button1" runat="server" CommandName="edit" Text="编辑" />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
</EditItemTemplate>
</asp:DataList>问题随之而来，怎么在点击编辑按钮后对DropDownList1进行数据绑定？这还是比较好解决的，可在DataList1_Edit函数中进行绑定，代码如下：
/// <summary>
/// 编辑
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
protected void DataList1_Edit(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
{
DataList1.EditItemIndex = e.Item.ItemIndex;
DataList1_DataBind();
//对DropDownList1进行数据绑定
string[] province = { "北京", "上海", "福建" };
DropDownList MyDropDownList = (DropDownList)DataList1.Items[e.Item.ItemIndex].FindControl("DropDownList1");
for (int i = 0; i < province.Length; i++)
{
MyDropDownList.Items.Add(new ListItem(province[i], province[i]));
}
}此外还有一种绑定方法：
<asp:DataList ID="DataList1" runat="server" DataKeyField="ID" OnEditCommand="DataList1_Edit">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Province") %>'></asp:Label>
<asp:Button ID="Button1" runat="server" CommandName="edit" Text="编辑" />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" DataSource='<%# DropDownList1_DataBind() %>'>
</asp:DropDownList>
</EditItemTemplate>
</asp:DataList>/// <summary>
/// 编辑
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
protected void DataList1_Edit(object source, DataListCommandEventArgs e)
{
DataList1.EditItemIndex = e.Item.ItemIndex;
DataList1_DataBind();
}
/// <summary>
/// DropDownList1数据绑定
/// </summary>
protected string[] DropDownList1_DataBind()
{
string[] province = { "北京", "上海", "福建" };
return province;
}数据绑定问题是解决了，但新的问题又随之而来：怎么让原先的值处于选中状态？不然给编辑造成了一定的不便！要解决这个问题，就先得想办法获取到原先的值，尝试了多种方法都无法直接获取，最终，在EditItemTemplate放个隐藏的表单来解决：
<asp:DataList ID="DataList1" runat="server" DataKeyField="ID" OnEditCommand="DataList1_Edit">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Province") %>'></asp:Label>
<asp:Button ID="Button1" runat="server" CommandName="edit" Text="编辑" />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Province") %>' Visible="false"></asp:TextBox>
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
</EditItemTemplate>
</asp:DataList>/// <summary>
/// 编辑
/// </summary>
/// <param name="source"></param>
/// <param name="e"></param>
protected void DataList1_Edit(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
{
DataList1.EditItemIndex = e.Item.ItemIndex;
DataList1_DataBind();
//对DropDownList1进行数据绑定
string oldProvince = ((TextBox)DataList1.Items[e.Item.ItemIndex].FindControl("TextBox1")).Text;
string[] province = { "北京", "上海", "福建" };
DropDownList MyDropDownList = (DropDownList)DataList1.Items[e.Item.ItemIndex].FindControl("DropDownList1");
for (int i = 0; i < province.Length; i++)
{
MyDropDownList.Items.Add(new ListItem(province[i], province[i]));
if (MyDropDownList.Items[MyDropDownList.Items.Count - 1].Value == oldProvince)
{
MyDropDownList.SelectedIndex = MyDropDownList.Items.Count - 1;
}
}
}
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