如何从一组现有的POCO对象编程生成CSDL或EDMX

我想模拟一下WCF数据服务用它的“$metadata”标记做什么。。。也就是说,发送一个CSDL文档,该文档描述了一个现有对象集,该对象集可能(或可能不)是实体框架模型的一部分。事实上,假设EF不是讨论的一部分。。。

我想创建一个服务,检查它可以返回的对象类型,生成一个CSDL文档并将其发送给客户机,以便客户机可以从CSDL生成这些对象(使用EDMGen应该可以)。一旦客户机生成了对象(并加载了生成的程序集),它就可以从服务接收强类型数据。

似乎EDMGen不能用于从POCOs生成CSDL(或EDMX)。。。它可以通过一个数据库连接来实现,您可以从CSDL生成poco,但没有其他方法。有没有人知道的办法?

具体实例

给定此代码:

public class DirectoryEntry
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Type { get; set; }
    public ICollection<DirectoryEntryProperty> Properties { get; set; }
}

public class DirectoryEntryProperty
{
    public int Id { get; set; }
    public string Key { get; set; }
    public string Value { get; set; }
    public DirectoryEntry DirectoryEntry { get ; set; }
}

我要生成此文档:

<Schema xmlns="http://schemas.microsoft.com/ado/2008/09/edm" xmlns:cg="http://schemas.microsoft.com/ado/2006/04/codegeneration" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" Namespace="DirectoryService" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns:ib10="http://www.ideablade.com/edm/2010" ib10:Tag="DirectoryService">
  <EntityContainer Name="DirectoryServiceContainer" annotation:LazyLoadingEnabled="true" ib10:GenerateDeveloperClasses="true" ib10:DevForceEnabled="false">
    <EntitySet Name="DirectoryEntries" EntityType="DirectoryService.DirectoryEntry" />
    <EntitySet Name="DirectoryEntryProperties" EntityType="DirectoryService.DirectoryEntryProperty" />
    <AssociationSet Name="DirectoryEntryPropertyDirectoryEntry" Association="DirectoryService.DirectoryEntryPropertyDirectoryEntry">
      <End Role="DirectoryEntryProperty" EntitySet="DirectoryEntryProperties" />
      <End Role="DirectoryEntry" EntitySet="DirectoryEntries" />
    </AssociationSet>
  </EntityContainer>
  <EntityType Name="DirectoryEntry">
    <Key>
      <PropertyRef Name="Id" />
    </Key>
    <Property Type="Int32" Name="Id" Nullable="false" annotation:StoreGeneratedPattern="Identity" />
    <Property Type="String" Name="Name" Nullable="false" />
    <Property Type="String" Name="Type" Nullable="false" />
    <NavigationProperty Name="Properties" Relationship="DirectoryService.DirectoryEntryPropertyDirectoryEntry" FromRole="DirectoryEntry" ToRole="DirectoryEntryProperty" ib10:Tag="DirectoryEntryPropertyCollectionHelper" />
  </EntityType>
  <EntityType Name="DirectoryEntryProperty">
    <Key>
      <PropertyRef Name="Id" />
    </Key>
    <Property Type="Int32" Name="Id" Nullable="false" annotation:StoreGeneratedPattern="Identity" />
    <NavigationProperty Name="DirectoryEntry" Relationship="DirectoryService.DirectoryEntryPropertyDirectoryEntry" FromRole="DirectoryEntryProperty" ToRole="DirectoryEntry" />
    <Property Type="Int32" Name="DirectoryEntryId" Nullable="false" />
    <Property Type="String" Name="Key" Nullable="false" />
    <Property Type="String" Name="Value" Nullable="false" />
  </EntityType>
  <Association Name="DirectoryEntryPropertyDirectoryEntry">
    <End Type="DirectoryService.DirectoryEntryProperty" Role="DirectoryEntryProperty" Multiplicity="*" />
    <End Type="DirectoryService.DirectoryEntry" Role="DirectoryEntry" Multiplicity="1" />
    <ReferentialConstraint>
      <Principal Role="DirectoryEntry">
        <PropertyRef Name="Id" />
      </Principal>
      <Dependent Role="DirectoryEntryProperty">
        <PropertyRef Name="DirectoryEntryId" />
      </Dependent>
    </ReferentialConstraint>
  </Association>
</Schema>