Try this:
List<Person> list = new List<Person>();
// populate the list somehow
if ( !IsPostBack )
{
DropDownList ddl = new DropDownList();
ddl.DataTextField = "Name";
ddl.DataValueField = "Id";
ddl.DataSource = list;
ddl.DataBind();
ddl.SelectedValue = list.Find( o => o.Selected == true ).Id.ToString();
}
If you can't guarantee that there will always be at least one selected item, then you'll want to handle that separately by checking the return value from the list.Find()
call to make sure it is not null
.
Also, DropDownList ddl = new DropDownList(); not needed if the webform has already declared:
<asp:DropDownList ID="ddl" runat="server" />
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…