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根据此示例，我正在使用带有 WebApi OData 的微风。如本文所述，由于缺少外键信息，我无法使用 ODataConventionModelBuilder。假设我有一个名为“Car”的实体，该实体派生自一个名为“Vehicle”的实体。使用 ODataConventionModelBuilder 我可以定义如下模型：

var builder = new ODataConventionModelBuilder();
builder.EntitySet<Vehicle>("Vehicles");
builder.EntitySet<Car>("Cars");

我可以像这样进行查询：

  • /odata/Vehicles --> 返回所有车辆。
  • /odata/Cars --> 只返回汽车。

但是对于 Breeze EdmBuilder 类，我只能使用“/odata/Vehicles”查询。“/odata/Cars”会导致“404 not found”错误。

似乎在使用“ODataConventionModelBuilder”时，“汽车”实体集是在元数据中定义的，但在使用微风 EdmBuilder 时，却不是。我可以在向元数据端点（'odata/$metadata'）发送请求时确认此行为。此问题中所述的代码优先和模型优先方法都会发生这种情况。

简而言之，在微风和Web Api OData中使用EdmBuilder类时如何使用继承。

更新

这是使用“ODataConventionModelBuilder”时的元数据：

<edmx:Edmx xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx" Version="1.0">
 <edmx:DataServices xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" m:DataServiceVersion="3.0" m:MaxDataServiceVersion="3.0">
  <Schema xmlns="http://schemas.microsoft.com/ado/2009/11/edm" Namespace="EFTest.Models">
   <EntityType Name="Vehicle">
    <Key>
     <PropertyRef Name="VehicleId"/>
    </Key>
    <Property Name="VehicleId" Type="Edm.Int32" Nullable="false"/>
    <Property Name="Name" Type="Edm.String"/>
   </EntityType>
   <EntityType Name="Car" BaseType="EFTest.Models.Vehicle">
    <Property Name="Capacity" Type="Edm.Int32" Nullable="false"/>
   </EntityType>
  </Schema>
  <Schema xmlns="http://schemas.microsoft.com/ado/2009/11/edm" Namespace="Default">
   <EntityContainer Name="Container" m:IsDefaultEntityContainer="true">
    <EntitySet Name="Vehicles" EntityType="EFTest.Models.Vehicle"/>
    <EntitySet Name="Cars" EntityType="EFTest.Models.Car"/>
   </EntityContainer>
  </Schema>
 </edmx:DataServices>
</edmx:Edmx>

这是使用微风 EdmBuilder 类时的元数据：

<edmx:Edmx xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx" Version="1.0">
 <edmx:DataServices xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" m:DataServiceVersion="3.0">
  <Schema xmlns="http://schemas.microsoft.com/ado/2009/11/edm" Namespace="TestDBModel">
   <EntityType Name="Car" BaseType="TestDBModel.Vehicle">
    <Property Name="Capacity" Type="Edm.Int32" Nullable="false"/>
   </EntityType>
   <EntityType Name="Vehicle">
    <Key>
     <PropertyRef Name="VehicleId"/>
    </Key>
    <Property xmlns:p6="http://schemas.microsoft.com/ado/2009/02/edm/annotation" Name="VehicleId" Type="Edm.Int32" Nullable="false" p6:StoreGeneratedPattern="Identity"/>
    <Property Name="Name" Type="Edm.String" Nullable="false" MaxLength="50" FixedLength="false" Unicode="true"/>
   </EntityType>
   <EntityContainer xmlns:p5="http://schemas.microsoft.com/ado/2009/02/edm/annotation" Name="TestDBEntities" p5:LazyLoadingEnabled="true">
    <EntitySet Name="Vehicles" EntityType="TestDBModel.Vehicle"/>
   </EntityContainer>
  </Schema>
 </edmx:DataServices>
</edmx:Edmx>

这是 edmx 文件中的概念模型部分：

<edmx:ConceptualModels>
  <Schema Namespace="TestDBModel" Alias="Self" annotation:UseStrongSpatialTypes="false" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns="http://schemas.microsoft.com/ado/2009/11/edm">
    <EntityType Name="Car" BaseType="TestDBModel.Vehicle">
      <Property Name="Capacity" Type="Int32" Nullable="false" />
    </EntityType>
    <EntityType Name="Vehicle">
      <Key>
        <PropertyRef Name="VehicleId" />
      </Key>
      <Property Name="VehicleId" Nullable="false" annotation:StoreGeneratedPattern="Identity" Type="Int32" />
      <Property Name="Name" Type="String" MaxLength="50" FixedLength="false" Unicode="true" Nullable="false" />
    </EntityType>
    <EntityContainer Name="TestDBEntities" annotation:LazyLoadingEnabled="true">
      <EntitySet Name="Vehicles" EntityType="Self.Vehicle" />
    </EntityContainer>
  </Schema>
</edmx:ConceptualModels>
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1 回答 1

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What stands out for me is that the Cars "EntitySet" is missing from the EDMX conceptual model and, consequently, from the metadata generated by EdmBuilder. OTOH, you included Cars when you called ODataConventionModelBuilder.

You aren't really talking about the same "model".

I think (hope) you will get the desired outcome if you add the Cars "EntitySet" to the DbContext.

于 2014-04-06T07:53:11.577 回答