下拉列表的selectedindex [英] selectedindex of a Dropdownlist

问题描述

if (DropDownList1.SelectedIndex >= 0 )
       {
           Literal2.Text  = DropDownList1.SelectedIndex .ToString ();
       }

我无法在if循环内的文字中显示选定的索引值，在上面的代码中，其将选定的索引值显示为0，任何替代方法都建议我.

i am not able to show a selected index value in a literal within the if loop, in the above code its showing the selected index value as 0, any alternative please suggest me.

推荐答案

尝试一下

try this

if (DropDownList1.SelectedIndex != 0 )
       {
           Literal2.Text  = DropDownList1.SelectedIndex .ToString ();
       }

您的代码是正确的，只需将其写入索引更改或将dropdownlist的AutopostBack属性设置为True.

Your code is correct just write it into index change or set AutopostBack property of dropdownlist to True.

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DropDownList1.SelectedIndex >= 0)
            lbl.Text = DropDownList1.SelectedIndex.ToString();
    }

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