entity-framework – Entityframework Mapping问题

发布时间：2020-12-16 06:50:21 所属栏目：asp.Net 来源：网络整理

导读：我在mvc上使用实体框架,但我遇到了这个方法的问题.我正在做的只是下面的反射方法,不明白为什么我得到一个字段映射错误. 我也在这里提到的字段中得到以下错误. 错误： – Error 13 Error 3021: Problem in mapping fragments starting at line 205:Each of th

我在mvc上使用实体框架,但我遇到了这个方法的问题.我正在做的只是下面的反射方法,不明白为什么我得到一个字段映射错误.

我也在这里提到的字段中得到以下错误.

错误： –

Error   13  Error 3021: Problem in mapping fragments starting at line 205:Each of the following   
columns in table FormBuilder_Form_Fields is mapped to multiple conceptual side properties:
FormBuilder_Form_Fields.ID is mapped to <FormFieldsForm.Form.ID,FormFieldsForm.FormFields.ID>
 C:NewDevelopmentCaseddimensionsCMSCaseddimensionsCMSCaseddimensionsCms.edmx    206 11  CaseddimensionsCMS

Error   14  Error 3021: Problem in mapping fragments starting at line 228:Each of the following columns in table FormBuilder_field_values is mapped to multiple conceptual side properties:
FormBuilder_field_values.ID is mapped to <FormFieldValues.FieldValues.ID,FormFieldValues.Form.ID>

我不确定这对实体框架来说意味着什么.

我在布局设计器中包含了edmx文件的屏幕截图：

这是我的edmx文件的pastbin

http://pastebin.com/GeL6mZd4

至于代码不想在这里发布它.

解决方法

遇到同样的问题,我找到了解决方案 here.
简而言之,你应该：

Fixing this duplicate mapping issue requires a referential constraint,
which the designer will only support in the next release,so save the
edmx file,close it,then right-click it in Solution Explorer,select
“Open With…” and double click on “XML Editor”.

In the CSDL section,you will see the ProductProductImages
association:

更新您的关联,例如：

<Association Name="FormsFormsFields">
  <End Type="TableSplittingModel.Forms" Role="Form" Multiplicity="1" />
  <End Type="TableSplittingModel.FormFields" Role="FormFields" Multiplicity="1" />
</Association>

通过添加ReferentialConstraint

<Association Name="FormsFormFields">
  <End Type="TableSplittingModel.Forms" Role="Forms" Multiplicity="1" />
  <End Type="TableSplittingModel.FormFields" Role="FormFields" Multiplicity="1" />
  <ReferentialConstraint>
    <Principal Role="Forms"><PropertyRef Name="id"/></Principal>
    <Dependent Role="FormFields"><PropertyRef Name="id"/></Dependent>
  </ReferentialConstraint>
</Association>

（编辑：李大同）

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