列表框在asp.net中没有得到所选项目 [英] Listbox in asp.net not getting selected items

问题描述

我有多个下拉＆放大器;列表框在我的网页。

I have multiple dropdown & listbox in my webpage.

我想从一个 lstCatID 列表框，我能够填充列表框与类别id 列表类别名称。

I am trying to get a list of CategoryID from a lstCatID listbox i am able to populate the listbox with category name.

如果我在第一次尝试正确地记得我的code正常工作，在那之后我做了一些变化，然后它说总是得到时间的第一个项目选择了x号

If i remember correctly in first attempt my code worked fine, after that i made some change then it stated to always get the first item selected x No. of time

<asp:ListBox ID="lstCatID" runat="server" DataTextField="CategoryName" 
                DataValueField="CategoryID" SelectionMode="Multiple" CssClass="lstListBox">
 </asp:ListBox>



protected void Button1_Click(object sender, EventArgs e)
{
    string CatID = string.Empty;
    foreach (ListItem li in lstCatID.Items)
    {
        if (li.Selected == true)
        {
           // Response.Write();
            CatID += lstCatID.SelectedItem.Value + ",";
        }
    }
    Response.Write(CatID);
}

我不知道是怎么回事错了，我checkd MSDN它准确显示做的是一样的。

I am not sure what is going wrong i checkd MSDN it show exactly the same way of doing it.

可能是我做错了什么。

只是为了用firefox，我能够看到多个选择的值选择添加属性。

Just to add using firefox i am able to see multiple selected value have selected property.

<option value="3" selected="selected">One</option>
<option value="2">Two</option>
<option value="29" selected="selected">Three</option>
<option value="25" selected="selected">Four</option>
<option value="22" >Five</option>

我在这种情况下输出将 3,3,3

我会在这方面AP preciate帮助

I would appreciate help in this regard

推荐答案

您是它每次设置为相同的值：

You are setting it to the same value every time:

foreach (ListItem li in lstCatID.Items)
{
    if (li.Selected == true)
    {
       // you are always using lstCatID.SelectedItem.Value.
        CatID += lstCatID.SelectedItem.Value + ",";
    }
}

当你真正想要的是选择在循环项目的值：

When you actually want the value of the item in your loop that is selected:

foreach (ListItem li in lstCatID.Items)
{
    if (li.Selected == true)
    {
        // get the value of the item in your loop
        CatID += li.Value + ",";
    }
}

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