有没有办法让ASP.NET DropDownList中的项目绑定到源上的方法而不是属性,以便它们可以有它们的文本或值?
<asp:DropDownList ID="dropDownList" runat="server" DataSourceID="dataSource" DataValueField="DataValueField" DataTextField="DataTextField" />
<asp:ObjectDataSource ID="dataSource" runat="server" SelectMethod="SelectForDataSource" TypeName="CategoryDao" />
public IEnumerable<object> SelectForDataSource()
{
return _repository.Search().Select(x => new{
DataValueField = x.CategoryId,
DataTextField = x.ToString() // Here is the trick!
}).Cast<object>();
}
<asp:DropDownList ID="DropDownListJour1" runat="server">
</asp:DropDownList>
<br />
<asp:DropDownList ID="DropDownListJour2" runat="server">
</asp:DropDownList>
protected void Page_Load(object sender, EventArgs e)
{
//Exemple with value different same as text (dropdown)
DropDownListJour1.DataSource = jour.ListSameValueText();
DropDownListJour1.DataBind();
//Exemple with value different of text (dropdown)
DropDownListJour2.DataSource = jour.ListDifferentValueText();
DropDownListJour2.DataValueField = "Key";
DropDownListJour2.DataTextField = "Value";
DropDownListJour2.DataBind();
}
你的 jour.cs 类(jour.cs)
public class jour
{
public static string[] ListSameValueText()
{
string[] myarray = {"a","b","c","d","e"} ;
return myarray;
}
public static Dictionary<int, string> ListDifferentValueText()
{
var joursem2 = new Dictionary<int, string>();
joursem2.Add(1, "Lundi");
joursem2.Add(2, "Mardi");
joursem2.Add(3, "Mercredi");
joursem2.Add(4, "Jeudi");
joursem2.Add(5, "Vendredi");
return joursem2;
}
}
public class RTIDropDownList : DropDownList
{
public delegate void ItemDataBoundDelegate( ListItem item, object dataRow );
[Description( "ItemDataBound Event" )]
public event ItemDataBoundDelegate ItemDataBound;
protected override void PerformDataBinding( IEnumerable dataSource )
{
if ( dataSource != null )
{
if ( !AppendDataBoundItems )
this.Items.Clear();
IEnumerator e = dataSource.GetEnumerator();
while ( e.MoveNext() )
{
object row = e.Current;
var item = new ListItem( DataBinder.Eval( row, DataTextField, DataTextFormatString ).ToString(), DataBinder.Eval( row, DataValueField ).ToString() );
this.Items.Add( item );
if ( ItemDataBound != null ) //
ItemDataBound( item, row );
}
}
}
}
以声明方式:
<asp:DropDownList ID="ddlType" runat="server" Width="250px" AppendDataBoundItems="true" DataSourceID="dsTypeList" DataTextField="Description" DataValueField="ID">
<asp:ListItem Value="0">All Categories</asp:ListItem>
</asp:DropDownList><br />
<asp:ObjectDataSource ID="dsTypeList" runat="server" DataObjectTypeName="MyType" SelectMethod="GetList" TypeName="MyTypeManager">
</asp:ObjectDataSource>
上面绑定到一个返回通用列表的方法,但您也可以绑定到返回DataReader的方法。 您还可以在代码中创建数据源。