.net – 实体框架参数化/重载构造函数？

在我之前使用Linq2SQL的应用程序中,我能够通过这样做来重载带有参数的构造函数：

Namespace CoreDb    
  Partial Public Class Accomplishment

    Public Sub New(ByVal accomplishmentTypeID As Object,ByVal description As String,ByVal title As String,ByVal applicableDate As DateTime,ByVal lastUpdatedBy As String)
        Me.New()

        If TypeOf (accomplishmentTypeID) Is Guid Then
            Me.AccomplishmentTypeId = accomplishmentTypeID
        End If

        If TypeOf (accomplishmentTypeID) Is String Then
            Me.AccomplishmentTypeId = New Guid(accomplishmentTypeID.ToString())
        End If

        Me.Description = description
        Me.ApplicableDate = applicableDate
        Me.Title = title
        Me.Id = Guid.NewGuid()
        Me.DateCreated = DateTime.Now
        Me.DateModified = DateTime.Now
        Me.LastUpdatedBy = lastUpdatedBy
        Me.CreatedBy = lastUpdatedBy
    End Sub
 End Class
End Namespace

基本上使用对象的部分类,共享.dbml文件的命名空间并调用默认构造函数然后执行其他操作.

那么在我的代码中我可以做类似的事情：

Dim accomplishment As New Accomplishment(id,description,title,applicableDate,lastUpdatedBy)

这似乎不再适用于Entity Framework,因为没有默认构造函数可以调用.

这不再有效吗？如果是这样,那么实现这样的东西有什么好办法呢？