问了很久都没人能明确回答的问题,谢谢大家

Question

 发表于：2008-08-27 15:08:50 楼主 
public class ColumnTemplate : ITemplate 
{ 
  public void InstantiateIn(Control container)      
    { 
        DropDownList dbl=new DropDownList(); 
        dbl.ID="dblpro_storage"; 
        dbl.DataBinding+=new System.EventHandler(this.BindtbColumn); 
        container.Controls.Add(dbl); 
    } 
  public void BindtbColumn(object sender, EventArgs e) 
    { 
        DropDownList dbl= (DropDownList) sender; 
        DataGridItem container = (DataGridItem) dbl.NamingContainer; 
string pp=((DataRowView)container.DataItem)["id"].ToString(); 
dbl.DataTextField ="storage_name"; 
dbl.DataValueField ="storage_ID"; 
dbl.DataSource =getstoragelist(); 
dbl.Items.Insert(0,new ListItem("请选择仓库","0")); //这儿不起作用 
        dbl.SelectedValue =((DataRowView)container.DataItem)["pro_storage"].ToString();//这儿会出错     } 
} 
 

Answer 1

dbl.DataSource =getstoragelist(); 
dbl.DataBinding();
dbl.Items.Insert(0,new ListItem("请选择仓库","0")); 

Answer 2

谢谢楼上的大哥.问题是
dbl.Items.Insert(0,new ListItem("请选择仓库","0")); //这儿不起作用 
 dbl.SelectedValue =((DataRowView)container.DataItem)["pro_storage"].ToString();//这儿会出错 

Answer 3

protected void DropDownList1_DataBound(object sender, EventArgs e)
    {
        this.DropDownList1.Items.Add(new ListItem("请选择", "0"));
        this.DropDownList1.SelectedIndex = DropDownList1.Items.Count - 1;
    }
dbl.DataBound+=new EventHandler(DropDownList1_DataBound);

Answer 4

dbl.Items.Insert(0,new ListItem("请选择仓库","0")); //这儿不起作用 像下面这样写看看,让添加的项Value为空,加载时作为选择项.        this.dbl.Items.Add("--请选择仓库--");
        this.dbl.Items[this.dbl.Items.Count - 1].Value = "";
        this.dbl.SelectedIndex = this.dbl.Items.Count - 1;