方法来自这篇博文：
EntityDataSource: To wrap or not to wrap
首先，创建以下方法：
static class EntityDataSourceExtensions
{
public static TEntity GetItemObject<TEntity>(object dataItem)
where TEntity : class
{
var entity = dataItem as TEntity;
if (entity != null)
{
return entity;
}
var td = dataItem as ICustomTypeDescriptor;
if (td != null)
{
return (TEntity)td.GetPropertyOwner(null);
}
return null;
}
}
以下代码演示如何使用：
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
var entity = EntityDataSourceExtensions.GetItemObject<Product>(e.Row.DataItem);
//...
}