尝试按对象返回多个组

Question

希望在linq中帮助嵌套组，我试图降低三级。

基本上，路径会从业务下降到 BusUnit 到 Level1

因此，在Business下有各种BusUnit，在BusUnits下有各种level1值

我想将此作为Json对象返回。

正如我现在所拥有的那样，我选择了BusUnits

如下

var queryNestedData = (from r in DataItems
                      group r by r.Business into businesses
                      from businessUnits in
                       (from r in businesses
                        group r by r.Businessunit)
                        group businessUnits by businesses.Key).Select(tg =>
                        new
                        {
                           Business = tg.Key,
                           BusinessUnits = tg.Select(tv => new { BusinessUnit = tv.Key })
                   });

我怎样才能到达Level1以便返回值？

Answer 1

您可以指定要包含在查询结果中的相关对象。准确的代码片段取决于您使用的LINQ提供程序。对于Entity Framework，它将是：

... from r in DataItems.Include(di => di.Business.Businessunit.Level1) ...