實體框架錯誤3021：映射到多個概念側屬性

我有一張PK AuthorID的作者表。實體框架錯誤3021：映射到多個概念側屬性

然後我有一張名爲AuthoritativeAuthors的表，其中有一張PK AuthorID。

AuthoritativeAuthor.AuthorID是一個指向Authors.AuthorID的外鍵。作者中的AuthorID可能會或可能不會出現在AuthoritativeAuthors中。

這裏是我得到 Error 3021: Problem in mapping fragments starting at line 4365:Each of the following columns in table AuthoritativeAuthors is mapped to multiple conceptual side properties: AuthoritativeAuthors.AuthorID is mapped to <FK_AuthoritativeAuthors_Authors.AuthoritativeAuthor.AuthorID, FK_AuthoritativeAuthors_Authors.Author.AuthorID>

這裏是似乎相關的EDMX所有的代碼錯誤。

存儲模型

<EntityType Name="Authors"> 
    <Key> 
     <PropertyRef Name="AuthorID" /> 
    </Key> 
    <Property Name="AuthorID" Type="int" Nullable="false" /> 
    <Property Name="Name" Type="nvarchar" MaxLength="254" /> 
</EntityType> 
<EntityType Name="AuthoritativeAuthors"> 
    <Key> 
     <PropertyRef Name="AuthorID" /> 
    </Key> 
    <Property Name="AuthoritativeAuthorID" Type="int" Nullable="false" /> 
    <Property Name="AuthorID" Type="int" Nullable="false" /> 
</EntityType> 
<Association Name="FK_AuthoritativeAuthors_Authors"> 
    <End Role="AuthoritativeAuthor" Type="WCDBModel.Store.AuthoritativeAuthors" Multiplicity="0..1" /> 
    <End Role="Author" Type="WCDBModel.Store.Authors" Multiplicity="1" /> 
    <ReferentialConstraint> 
     <Principal Role="Author"> 
      <PropertyRef Name="AuthorID" /> 
     </Principal> 
     <Dependent Role="AuthoritativeAuthor"> 
      <PropertyRef Name="AuthorID" /> 
     </Dependent> 
    </ReferentialConstraint> 
</Association>

概念模型

<EntitySet Name="AuthorSet" EntityType="WCDBModel.Author" /> 
<EntitySet Name="AuthoritativeAuthorSet" EntityType="WCDBModel.AuthoritativeAuthor" /> 
<AssociationSet Name="FK_AuthoritativeAuthors_Authors" Association="WCDBModel.FK_AuthoritativeAuthors_Authors"> 
    <End Role="Author" EntitySet="AuthorSet" /> 
    <End Role="AuthoritativeAuthor" EntitySet="AuthoritativeAuthorSet" /> 
</AssociationSet> 
<EntityType Name="Author"> 
    <Key> 
     <PropertyRef Name="AuthorID" /> 
    </Key> 
    <Property Name="AuthorID" Type="Int32" Nullable="false" /> 
    <Property Name="Name" Type="String" Nullable="true" /> 
    <NavigationProperty Name="AuthoritativeAuthors" Relationship="WCDBModel.FK_AuthoritativeAuthors_Authors" FromRole="Author" ToRole="AuthoritativeAuthor" /> 
</EntityType> 
<Association Name="FK_AuthoritativeAuthors_Authors"> 
    <End Type="WCDBModel.Author" Role="Author" Multiplicity="1" /> 
    <End Type="WCDBModel.AuthoritativeAuthor" Role="AuthoritativeAuthor" Multiplicity="0..1" /> 
</Association> 
<EntityType Name="AuthoritativeAuthor"> 
    <Key> 
     <PropertyRef Name="AuthorID" /> 
    </Key> 
    <Property Type="Int32" Name="AuthorID" Nullable="false" /> 
    <Property Type="Int32" Name="AuthoritativeAuthorID" Nullable="false" /> 
    <NavigationProperty Name="Author" Relationship="WCDBModel.FK_AuthoritativeAuthors_Authors" FromRole="AuthoritativeAuthor" ToRole="Author" /> 
</EntityType>

映射

<EntitySetMapping Name="AuthorSet"> 
    <EntityTypeMapping TypeName="IsTypeOf(WCDBModel.Author)"> 
     <MappingFragment StoreEntitySet="Authors"> 
      <ScalarProperty Name="Name" ColumnName="Name" /> 
      <ScalarProperty Name="AuthorID" ColumnName="AuthorID" /> 
     </MappingFragment> 
    </EntityTypeMapping> 
</EntitySetMapping> 
<EntitySetMapping Name="AuthoritativeAuthorSet"> 
    <EntityTypeMapping TypeName="IsTypeOf(WCDBModel.AuthoritativeAuthor)"> 
     <MappingFragment StoreEntitySet="AuthoritativeAuthors"> 
      <ScalarProperty Name="AuthoritativeAuthorID" ColumnName="AuthoritativeAuthorID"/> 
      <ScalarProperty Name="AuthorID" ColumnName="AuthorID" /> 
     </MappingFragment> 
    </EntityTypeMapping> 
</EntitySetMapping> 
<AssociationSetMapping Name="FK_AuthoritativeAuthors_Authors" TypeName="WCDBModel.FK_AuthoritativeAuthors_Authors" StoreEntitySet="AuthoritativeAuthors"> 
    <EndProperty Name="AuthoritativeAuthor"> 
     <ScalarProperty Name="AuthorID" ColumnName="AuthorID" /> 
    </EndProperty> 
    <EndProperty Name="Author"> 
     <ScalarProperty Name="AuthorID" ColumnName="AuthorID" /> 
    </EndProperty> 
    <Condition ColumnName="AuthorID" IsNull="false" /> 
</AssociationSetMapping>

在找到這個錯誤的原因的任何幫助，將不勝感激。

來源

2013-02-28 davidgarrison

您使用的是什麼版本的實體框架，3.5或4以上？ – 2013-07-05 01:08:28

[已回答] [1]在同一[問題] [2]中，希望能對你有所幫助。 [1]：http://stackoverflow.com/a/28759761/1638622 [2]：http://stackoverflow.com/questions/25177720/entityframework-mapping-issue/28759761#28759761 – 2015-02-27 08:25:16

我最終在我的AuthoritativeAuthor表中創建了一個不是外鍵的啞元主鍵。

來源

2013-03-04 18:33:43 davidgarrison

實體框架錯誤3021：映射到多個概念側屬性

回答

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