使用强类型数据而不是字符串绑定到下拉列表

创建一个自定义属性来执行此操作

internal class Metadata
{
    [MappingColumn (Type="Key")]
    public int ContractId { get; set; }
    [Required]
    [MappingColumn (Type="Name")]
    public string Name { get; set; }
}

使用此签名创建两个方法

string GetKeyColumName(Type type) //will perfom a loop on the type properties custom attribute and return the first with the type Key

string GetNameColumnName(Type type)//will perfom a loop on the type properties custom attribute and return the first with the type Name

using (var context = new IMToolDataContext())
{
    ddlContracts.DataValueField = GetKeyColumnName(typeof(Metadata));
    ddlContracts.DataTextField = GetNameColumnName(typeof(Metadata));
    ddlContracts.DataSource = context
        .AllContracts
        .OrderBy(o => o.Name);
    ddlContracts.DataBind();
}

编辑: 我提到的column属性是yourcunstom属性,而不是Linq中的属性。好的,我应该叫它MappingColumn,它可以这样声明:

public class MappingColumnAttribute : System.Attribute 
{

   public string Type {get;set;}
}