如何添加值 - 将有界DropDownList作为选定的值 [英] How to add value as -- to bounded DropDownList to be the selected one

问题描述

如何增加价值 -

将有界DropDownList作为选定的一个



我试过这个：

How to add value as --
To bounded DropDownList to be the selected one

I tried this:

ListItem lst = new ListItem();

       lst.Value = "0";
       lst.Text = "--";

       ddlBookName.Items.Add(lst);
       ddlBookName.SelectedItem.Value = lst.Text;
       ddlBookName.DataBind();

并没有成功！..

And it didn't success!..

推荐答案

执行此操作：

Do this:

ddlBookName.SelectedIndex = ddlBookName.Items.IndexOf(ddlBookName.Items.FindByText(lst.Text));

执行以下操作

do as below

ddlBookName.Items.Clear();
ddlBookName.Items.Insert(0, new ListItem("--", "0"));
ddlBookName.SelectedIndex = 0;
ddlBookName.AppendDataBoundItems = true;
ddlBookName.DataValueField = valueName; // change value field accordingly
ddlBookName.DataTextField = textName;  // change text field accordingly
ddlBookName.DataSource = datasource;  // change datasource accordingly
ddlBookName.DataBind();

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