c# - Generics: Type cannot be implicitly converted -


I have the following categories: 

  Public Interface IWaybillDocument {long DocumentId {find; Set; } Receive a long billing document ID { Set; } String shiptonname {get; Set; } Byte address type {get; Set; } String City {Received; Set; } String country {get; Set; } Get String Postcode { Set; } String Steregeian {get; Set; } String Street 1 {Get; Set; } String Street 2 {Received; Set; } String suburbs {get; Set; } Zero merge addressing (address address); }} Public Class Vibrator DocumentList: ERPL ListBase & lt; IWaybillDocument & gt; {Public WaybillDocumentList (): Base () {}} Public Partial Class WaybillDocument: IWaybillDocument, Inonrepudiable {Public Zero MergeAddressing (address addresses) {address.Street1 = this.Street1; Address.Street2 = this.Street2; Address. Subtitles = this Suburb; Ct = ct.City; Address.ZipCode = this.PostCode; Address.StateRegion = this.StateRegion; Address. Address.AddressKind = (AddressKind) this.AddressType; }}

They all compile well but when trying to apply this extension method: 

  public static EntitySet & lt ; T & gt; ToEntitySetFromInterface & LT; T, u & gt; (The IList & lt; u & gt; Source) where T: Square, U {var ess = New EntitySet & lt; T & gt; (); IEnumerator & lt; U & gt; Ie = source.GetEnumerator (); While (i.e. MeNext ()) {es.Add ((t) ie.Current); } Return SAS; }

Like this: 

  Enter public Zero InsertWaybills (WaybillDocumentList waybills) {try {; This.Context.WaybillDocuments.InsertAllOnSubmit (waybills.ToEntitySetFromInterface & lt; WaybillDocument, IWaybillDocument & gt; ()); This.Context.SubmitChanges (); } Hold (exception before) {new deluxe ("zero inserts vs. WebList) failed:" + pre., Message, east); }}

I get a compilation error

Type 'WaybillDocument' should not be used as a type parameter 'T' in the normal type or method Can 'LinqExtensions .toEntitySetFromInterface (System.Collections.Generic.IList)' There is an underlying reference conversion from 'WaybillDocument' to 'IWaybillDocument' 

  waybills.ToEntitySetFromInterface & LT; WaybillDocument, IWaybillDocument & gt; ()

Underlined why this happens when it explicitly inherits the interface?

Update: ERPPlustBase (Details deleted) 

  Public class ERPListBase & lt; T & gt; : List & lt; T & gt; {Public ERPListBase (): Base () {}}

I have pasted you With the new project code and with some modifications such as ERPListBase -> list and compile it, then my guess is that you have two interfaces iWaybillDocument and you are referring to the wrong one of them.


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