Sharepoint 2010 在BDC模型中执行Entity.FindSpecific时出错

我正在为Sharepoint 2010中的第一个BDC模型而挣扎。我创建了一个非常简单的模型，只有一个实体。我尝试通过以下操作查找特定条目：

    private IEntityInstance GetBdcEntityInstance(string nr, string entityName)
    {
        Identity id = new Identity(nr);
        IEntity entity = mCatalog.GetEntity(Constants.BdcNavEntityNameSpace, pEntityName);
        IEntityInstance instance = entity.FindSpecific(id, navLobSystemInstance);
        return instance;
    }

navLobSystemInstance初始化为：

mNavLobSystemInstance = mCatalog.GetLobSystem("NAVViews").GetLobSystemInstances()["NAVViews"];

此方法在entity.FindSpecific崩溃，出现以下错误：

此实体外部内容类型不属于 提供了LobSystemInstance外部系统实例。参数名称： lobSystemInstance

我认为这试图告诉我，实体不是我定义的LOB系统的一部分，因此我肯定搞乱了BDC模型XML。我还不熟悉这种特殊的XML丛林格式，我已经尝试了很多方法，但我对它的理解还不够透彻，看不到任何“明显”的错误。有人有主意吗

以下是完整的BDC模型XML：

<?xml version="1.0" encoding="utf-8"?>
<Model xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.microsoft.com/windows/2007/BusinessDataCatalog" Name="NAVViews">
  <Properties>
    <Property Name="ConnectionString" Type="System.String"></Property>
  </Properties>
  <LobSystems>
    <LobSystem Name="NAV" Type="DotNetAssembly">
      <LobSystemInstances>
        <LobSystemInstance Name="NAVViews" />
      </LobSystemInstances>
      <Entities>
        <Entity Name="BdcCustomer" Namespace="BdcNAVModel.NAVViews" Version="1.0.0.1">
          <Properties>
            <Property Name="Class" Type="System.String">BdcNAVModel.NAVViews.BdcCustomerService, NAVViews</Property>
          </Properties>
          <Identifiers>
            <Identifier Name="No" TypeName="System.String" />
          </Identifiers>
          <Methods>
            <Method Name="ReadItem">
              <Parameters>
                <Parameter Name="returnParameter" Direction="Return">
                  <TypeDescriptor Name="BdcCustomer" TypeName="BdcNAVModel.NAVViews.BdcCustomer, NAVViews" IsCollection="false">
                    <TypeDescriptors>
                      <TypeDescriptor Name="No" TypeName="System.String" />
                      <TypeDescriptor Name="Name" TypeName="System.String" />
                      <TypeDescriptor Name="Name2" TypeName="System.String" />
                      <TypeDescriptor Name="Address" TypeName="System.String" />
                      <TypeDescriptor Name="Address2" TypeName="System.String" />
                      <TypeDescriptor Name="ZipCode" TypeName="System.String" UpdaterField="false" />
                      <TypeDescriptor Name="City" TypeName="System.String" />
                      <TypeDescriptor Name="CountryRegion" TypeName="System.String" />
                      <TypeDescriptor Name="PhoneNo" TypeName="System.String" />
                      <TypeDescriptor Name="SalesPersonCode" TypeName="System.String" />
                      <TypeDescriptor Name="CountryRegionCode" TypeName="System.String" />
                    </TypeDescriptors>
                    </TypeDescriptor>
                    </Parameter>
                <Parameter Name="CustomerNo" Direction="In">
                  <TypeDescriptor Name="CustomerNo" TypeName="System.String" /></Parameter>
              </Parameters>
              <MethodInstances>
                <MethodInstance Name="ReadItem" Type="SpecificFinder" ReturnParameterName="returnParameter" ReturnTypeDescriptorPath="BdcCustomer" />
              </MethodInstances></Method>
            <Method Name="ReadList">
              <Parameters>
                <Parameter Name="customerList" Direction="Return">
                  <TypeDescriptor Name="CustomerList" TypeName="System.Collections.Generic.IEnumerable`1[[BdcNAVModel.BdcCustomer, NAVViews]]" IsCollection="true">
                    <TypeDescriptors>
                      <TypeDescriptor Name="BdcCustomer" TypeName="BdcNAVModel.NAVViews.BdcCustomer, NAVViews" IsCollection="false">
                        <TypeDescriptors>
                          <TypeDescriptor Name="No" TypeName="System.String" />
                          <TypeDescriptor Name="Name" TypeName="System.String" />
                          <TypeDescriptor Name="Name2" TypeName="System.String" />
                          <TypeDescriptor Name="Address" TypeName="System.String" />
                          <TypeDescriptor Name="Address2" TypeName="System.String" />
                          <TypeDescriptor Name="ZipCode" TypeName="System.String" />
                          <TypeDescriptor Name="City" TypeName="System.String" />
                          <TypeDescriptor Name="CountryRegion" TypeName="System.String" />
                          <TypeDescriptor Name="PhoneNo" TypeName="System.String" />
                          <TypeDescriptor Name="SalesPersonCode" TypeName="System.String" />
                          <TypeDescriptor Name="CountryRegionCode" TypeName="System.String" /></TypeDescriptors></TypeDescriptor></TypeDescriptors>
                    </TypeDescriptor></Parameter>
              </Parameters>
              <MethodInstances>
                <MethodInstance Name="ReadList" Type="Finder" ReturnParameterName="customerList" ReturnTypeDescriptorPath="CustomerList" />
              </MethodInstances></Method>
          </Methods></Entity>
      </Entities>
    </LobSystem>
  </LobSystems>
</Model>

---

放置NAVViews的LogSystemInstance名称应该是返回BdcCustomer的TypeDescriptor的名称。这两个应该对应于您的实体的名称，我想它是BdcCustomer。因此，尝试改变这一行：

<LobSystemInstance Name="NAVViews" />

为此：

<LobSystemInstance Name="BdcCustomer" />

你也可以看看我最近的同事