Entity framework stored procedure mapping results not unique entities - entity-framework

Question

I have a problem where I've mapped a stored procedure named sp_getMyEntity, which takes in one parameter called Id and then maps the results to a custom entity called MyEntity
I'm using mock data to illustrate the point. When I run the stored procedure with an id of 1, I get two distinct results back from the database:
exec [dbo].[sp_getMyEntity] #Id=1
Results:
ID - AddressId
1 - 6
1 - 3
When querying the ObjectContext using LINQ, I get 2 MyEntity's back but the AddressId for both of them is 6, not 6 and 3 respectively. Here is my call using LINQ:
Entities context = new Entities();
var entities = from s in context.GetMyEntity(1)
select s;
return entities.ToList();
Here is the EDMX xml:
<edmx:Edmx Version="1.0" xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">
<!-- EF Runtime content -->
<edmx:Runtime>
<!-- SSDL content -->
<edmx:StorageModels>
<Schema Namespace="MyProjectModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2008" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2006/04/edm/ssdl">
<EntityContainer Name="MyProjectModelStoreContainer">
<EntitySet Name="MyEntitySet" EntityType="MyProjectModel.Store.MyEntity" />
</EntityContainer>
<Function Name="sp_getMyEntity" Aggregate="false" BuiltIn="false" NiladicFunction="false" IsComposable="false" ParameterTypeSemantics="AllowImplicitConversion" Schema="dbo">
<Parameter Name="Id" Type="int" Mode="In" />
</Function>
<EntityType Name="MyEntity">
<Key>
<PropertyRef Name="Id" />
</Key>
<Property Name="Id" Type="int" Nullable="false" />
<Property Name="AddressId" Type="int" Nullable="true" />
</EntityType>
</Schema>
</edmx:StorageModels>
<!-- CSDL content -->
<edmx:ConceptualModels>
<Schema Namespace="MyProjectModel" Alias="Self" xmlns="http://schemas.microsoft.com/ado/2006/04/edm">
<EntityContainer Name="MyProjectViewEntities" >
<EntitySet Name="MyEntitySet" EntityType="MyProjectModel.MyEntity" />
<FunctionImport Name="GetMyEntity" EntitySet="MyEntitySet" ReturnType="Collection(MyProjectModel.MyEntity)">
<Parameter Name="Id" Mode="In" Type="Int32" />
</FunctionImport>
</EntityContainer>
<EntityType Name="MyEntity">
<Key>
<PropertyRef Name="Id" />
</Key>
<Property Name="Id" Type="Int32" Nullable="false" />
<Property Name="AddressId" Type="Int32" Nullable="true" />
</EntityType>
</Schema>
</edmx:ConceptualModels>
<!-- C-S mapping content -->
<edmx:Mappings>
<Mapping Space="C-S" xmlns="urn:schemas-microsoft-com:windows:storage:mapping:CS">
<EntityContainerMapping StorageEntityContainer="MyProjectModelStoreContainer" CdmEntityContainer="MyProjectViewEntities" >
<FunctionImportMapping FunctionImportName="GetMyEntity" FunctionName="MyProjectModel.Store.sp_getMyEntity" />
<EntitySetMapping Name="MyEntitySet">
<EntityTypeMapping TypeName="IsTypeOf(MyProjectModel.MyEntity)">
<MappingFragment StoreEntitySet="MyEntitySet">
<ScalarProperty Name="AddressId" ColumnName="AddressId" />
<ScalarProperty Name="Id" ColumnName="Id" />
</MappingFragment>
</EntityTypeMapping>
</EntitySetMapping>
</EntityContainerMapping>
</Mapping>
</edmx:Mappings>
</edmx:Runtime>
<!-- EF Designer content (DO NOT EDIT MANUALLY BELOW HERE) -->
<edmx:Designer xmlns="http://schemas.microsoft.com/ado/2007/06/edmx">
<edmx:Connection>
<DesignerInfoPropertySet>
<DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly" />
</DesignerInfoPropertySet>
</edmx:Connection>
<edmx:Options>
<DesignerInfoPropertySet>
<DesignerProperty Name="ValidateOnBuild" Value="true" />
</DesignerInfoPropertySet>
</edmx:Options>
<!-- Diagram content (shape and connector positions) -->
<edmx:Diagrams>
<Diagram Name="MyProjectModel" ZoomLevel="100" >
<EntityTypeShape EntityType="MyProjectModel.MyEntity" Width="1.5" PointX="5.25" PointY="0.5" Height="7.8375048828125" />
<EntityTypeShape EntityType="MyProjectModel.MyEntity" Width="1.5" PointX="5.5" PointY="1.375" Height="1.2636116536458335" /></Diagram></edmx:Diagrams>
</edmx:Designer>
</edmx:Edmx>
Any ideas why the MyEntity's are not unique?

Answer 1

Because the SP column which your SSDL identifies as the key is not a unique column. You cannot have a "key" with duplicate values.

Answer 2

As Craig stated above my Key property was not unique, so I ended up changing the SQL to look at follows:
SELECT
ROW_NUMBER() OVER(ORDER BY Id) AS KeyId
, Id
, AddressId
FROM
MyTable
WHERE
Id = #Id
Then the EDMX xml looks as follows, notice the new key is a bigint and Int64:
<edmx:Edmx Version="1.0" xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">
<!-- EF Runtime content -->
<edmx:Runtime>
<!-- SSDL content -->
<edmx:StorageModels>
<Schema Namespace="MyProjectModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2008" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2006/04/edm/ssdl">
<EntityContainer Name="MyProjectModelStoreContainer">
<EntitySet Name="MyEntitySet" EntityType="MyProjectModel.Store.MyEntity" />
</EntityContainer>
<Function Name="sp_getMyEntity" Aggregate="false" BuiltIn="false" NiladicFunction="false" IsComposable="false" ParameterTypeSemantics="AllowImplicitConversion" Schema="dbo">
<Parameter Name="Id" Type="int" Mode="In" />
</Function>
<EntityType Name="MyEntity">
<Key>
<PropertyRef Name="KeyId" />
</Key>
<Property Name="KeyId" Type="bigint" Nullable="false" />
<Property Name="Id" Type="int" Nullable="false" />
<Property Name="AddressId" Type="int" Nullable="true" />
</EntityType>
</Schema>
</edmx:StorageModels>
<!-- CSDL content -->
<edmx:ConceptualModels>
<Schema Namespace="MyProjectModel" Alias="Self" xmlns="http://schemas.microsoft.com/ado/2006/04/edm">
<EntityContainer Name="MyProjectViewEntities" >
<EntitySet Name="MyEntitySet" EntityType="MyProjectModel.MyEntity" />
<FunctionImport Name="GetMyEntity" EntitySet="MyEntitySet" ReturnType="Collection(MyProjectModel.MyEntity)">
<Parameter Name="Id" Mode="In" Type="Int32" />
</FunctionImport>
</EntityContainer>
<EntityType Name="MyEntity">
<Key>
<PropertyRef Name="KeyId" />
</Key>
<Property Name="KeyId" Type="Int64" Nullable="false" />
<Property Name="Id" Type="Int32" Nullable="false" />
<Property Name="AddressId" Type="Int32" Nullable="true" />
</EntityType>
</Schema>
</edmx:ConceptualModels>
<!-- C-S mapping content -->
<edmx:Mappings>
<Mapping Space="C-S" xmlns="urn:schemas-microsoft-com:windows:storage:mapping:CS">
<EntityContainerMapping StorageEntityContainer="MyProjectModelStoreContainer" CdmEntityContainer="MyProjectViewEntities" >
<FunctionImportMapping FunctionImportName="GetMyEntity" FunctionName="MyProjectModel.Store.sp_getMyEntity" />
<EntitySetMapping Name="MyEntitySet">
<EntityTypeMapping TypeName="IsTypeOf(MyProjectModel.MyEntity)">
<MappingFragment StoreEntitySet="MyEntitySet">
<ScalarProperty Name="AddressId" ColumnName="AddressId" />
<ScalarProperty Name="Id" ColumnName="Id" />
<ScalarProperty Name="KeyId" ColumnName="KeyId" />
</MappingFragment>
</EntityTypeMapping>
</EntitySetMapping>
</EntityContainerMapping>
</Mapping>
</edmx:Mappings>
</edmx:Runtime>
<!-- EF Designer content (DO NOT EDIT MANUALLY BELOW HERE) -->
<edmx:Designer xmlns="http://schemas.microsoft.com/ado/2007/06/edmx">
<edmx:Connection>
<DesignerInfoPropertySet>
<DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly" />
</DesignerInfoPropertySet>
</edmx:Connection>
<edmx:Options>
<DesignerInfoPropertySet>
<DesignerProperty Name="ValidateOnBuild" Value="true" />
</DesignerInfoPropertySet>
</edmx:Options>
<!-- Diagram content (shape and connector positions) -->
<edmx:Diagrams>
<Diagram Name="MyProjectModel" ZoomLevel="100" >
<EntityTypeShape EntityType="MyProjectModel.MyEntity" Width="1.5" PointX="5.25" PointY="0.5" Height="7.8375048828125" />
<EntityTypeShape EntityType="MyProjectModel.MyEntity" Width="1.5" PointX="5.5" PointY="1.375" Height="1.2636116536458335" /></Diagram></edmx:Diagrams>
</edmx:Designer>
</edmx:Edmx>