你把调试属性放在服务类中了吗?
**[System.ServiceModel.ServiceBehavior(IncludeExceptionDetailInFaults = true)]**
public class MyDataService : DataService<...>
{
// This method is called only once to initialize service-wide policies.
public static void InitializeService(IDataServiceConfiguration config)
{
// TODO: set rules to indicate which entity sets and service operations are visible, updatable, etc.
// Examples:
config.SetEntitySetAccessRule("*", EntitySetRights.AllRead);
config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
**config.UseVerboseErrors = true;**
}