今天下午有人在论坛咨询 LinqDataSource 控件如何进行组合字段数据显示在下列列表中，其实，很简单，就是使用new 重新生成一个临时类即可。下面是完整的代码。
C# 代码
using System;
using System.Collections.Generic;
using System.Web;
/// <summary>
///Books 的摘要说明
/// </summary>
public class Books
{
public int Id { get; set; }
public String Author { get; set; }
public String Title { get; set; }
public DateTime PunDate { get; set; }
public Books() { }
public List<Books> GetBooks
{
get
{
return this.GetInternalBooks();
}
}
internal List<Books> GetInternalBooks()
{
List<Books> bs = new List<Books>();
bs.Add(new Books { Id = 1, Author = "孟宪会", Title = "《ASP.NET 2.0 应用开发技术》", PunDate = System.DateTime.Now.AddMonths(-10) });
bs.Add(new Books { Id = 2, Author = "孟宪会", Title = "《Eric Meyer谈CSS（卷2）》", PunDate = System.DateTime.Now });
bs.Add(new Books { Id = 3, Author = "孟宪会", Title = "《Eric Meyer谈CSS（卷1）》", PunDate = System.DateTime.Now.AddMonths(+10) });
return bs;
}
}
ASPX 代码
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="LinqDataSource1"
DataTextField="DataText" DataValueField="Id">
</asp:DropDownList>
<asp:LinqDataSource ID="LinqDataSource1" runat="server" ContextTypeName="Books" TableName="GetBooks"
Select='new(Id,Id.toString() + "--" + Author + "--" + Title + "--" + PunDate.ToString("yyyy-MM-dd") as DataText)'>
</asp:LinqDataSource>
</form>
</body>
</html>
最后的执行结果将是下面的样子：