添加项目到下拉列表不起作用

问题描述

我在一个下拉列表中有一个奇怪的问题。

它有数据绑定项目并依赖于另一个下拉列表。

因此，如果我从第一个下拉列表中选择一个值，那么这个下拉列表将包含数据绑定项。



我的问题我有的是我想在索引0处添加一个值为ALL的值，并在显示数据绑定项后显示但这不起作用。我有它在这个下面的其他下拉菜单工作。



这里是我的代码：

Hi,

I have a weird issue on one drop down list.
It has databound items and is dependant on another dropdownlist.
So if I select a value from the 1st dropdown list then this dropdownlist in question will have databound items.

the issue that I am having is that I want to add a value at index 0 that says "ALL" and there after display the databound items but this is not working. I have it working for the rest of the dropdowns beside this 1.

here is my code:

ddlPromoSuffEdit.Items.Clear();
ddlPromoSuffEdit.Items.Add(new ListItem("All", "")); //this is not being added in but data items are populated
ddlPromoSuffEdit.DataSourceID = "";
ddlPromoSuffEdit.DataSource = odsPromoSuffEdit.Select();
ddlPromoSuffEdit.DataBind();

推荐答案

ddlPromoSuffEdit.Items.Clear();
ddlPromoSuffEdit.DataSourceID = "";
ddlPromoSuffEdit.DataSource = odsPromoSuffEdit.Select();
ddlPromoSuffEdit.DataBind();
//Insert new ListItem ... 
ddlPromoSuffEdit.Items.Insert(0, (new ListItem("All", "")));

...希望它有所帮助。

... hope it helps.

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