如何使用web api odata获取子记录的总和？

如何返回web api odata中OrderItems价格（ItemTotalPrice）的总和

web api odata似乎不支持$apply，如下所述：

我有一个web api odata查询，如：

http://localhost:29446/odata/OrderItems

返回以下json：

{
  "odata.metadata": "http://localhost:29446/odata/$metadata#OrderItems",
  "value": [{
    "OrderItemID": 17,
    "ItemDescription": "test",
    "ItemQty": 1,
    "ItemUnitPrice": "1.10",
    "ItemTaxGroup": 1,
    "ItemTotalTax": "0.10",
    "ItemTotalPrice": "1.22",
    "ItemSubProgram": 1,
    "ItemAccount": 1,
    "ItemActualCost": "1.22",
    "OrderID": 3
  }, {
    "OrderItemID": 18,
    "ItemDescription": "test",
    "ItemQty": 1,
    "ItemUnitPrice": "1.10",
    "ItemTaxGroup": 1,
    "ItemTotalTax": "0.10",
    "ItemTotalPrice": "1.10",
    "ItemSubProgram": 1,
    "ItemAccount": 1,
    "ItemActualCost": "1.00",
    "OrderID": 3
  }, {
    "OrderItemID": 19,
    "ItemDescription": "test",
    "ItemQty": 1,
    "ItemUnitPrice": "1.10",
    "ItemTaxGroup": 1,
    "ItemTotalTax": "0.10",
    "ItemTotalPrice": "1.10",
    "ItemSubProgram": 1,
    "ItemAccount": 1,
    "ItemActualCost": "1.00",
    "OrderID": 3
  }, {
    "OrderItemID": 20,
    "ItemDescription": "test",
    "ItemQty": 1,
    "ItemUnitPrice": "1.10",
    "ItemTaxGroup": 1,
    "ItemTotalTax": "0.10",
    "ItemTotalPrice": "1.10",
    "ItemSubProgram": 1,
    "ItemAccount": 1,
    "ItemActualCost": "1.00",
    "OrderID": 3
  }, {
    "OrderItemID": 21,
    "ItemDescription": "test",
    "ItemQty": 1,
    "ItemUnitPrice": "1.10",
    "ItemTaxGroup": 1,
    "ItemTotalTax": "0.10",
    "ItemTotalPrice": "1.10",
    "ItemSubProgram": 1,
    "ItemAccount": 1,
    "ItemActualCost": "1.00",
    "OrderID": 3
  }]
}

我认为以下方法可能有效：

http://localhost:29446/odata/OrderItems?$apply=aggregate(ItemTotalPrice with sum as Total)

但我得到了以下错误：

The query parameter '$apply' is not supported.

---

我将OData v4与Web API 2.2一起使用，但OData v4的Web API 2.2中尚未实现数据聚合扩展。对于.NET OData库的Github repo上提供的ODataLib级实现有一个请求：但尚未合并到主分支中。

解决方案是使用

.QueryByCube

LINQ操作符（）实现WebAPI控件

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