无法覆盖 TCollection.Notify:通知声明与之前的声明不同

Cannot override TCollection.Notify: Declaration of Notify differs from previous declaration

注意: 的标题不同,因此无法识别为匹配的标题。

System.Classes

TCollection = class(TPersistent)
protected
  procedure Notify(Item: TCollectionItem; Action: TCollectionNotification); virtual;
end;

我的单位

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
  System.Classes,
  Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls,
  Vcl.ExtCtrls, DB, System.Generics.Collections;

TTextDisplayLineInfos = class(TCollection)
protected
  procedure Notify(Item: TCollectionItem; Action: TCollectionNotification); override; //Here "[dcc32 Error] MyUnit.pas(85): E2037 Declaration of 'Notify' differs from previous declaration"
end;

implementation

procedure TTextDisplayLineInfos.Notify(Item: TCollectionItem;
  Action: TCollectionNotification);
begin
  inherited; //Here "[dcc32 Error] MyUnit.pas(475): E2008 Incompatible types"
  //..............
end;

Notify方法的签名已经被copy-paste拿走了,所以不会有任何错误;

错误

在界面部分:

[dcc32 Error] MyUnit.pas(85): E2037 Declaration of 'Notify' differs from previous declaration

在实施部分:

[dcc32 Error] MyUnit.pas(475): E2008 Incompatible types

问题

Whai错了?

不幸的是,Delphi 声明了两次 TCollectionNotification:一次位于 System.Classes,另一次位于 System.Generics.Collections.

要解决此问题,请在您的 uses 子句中将 System.Generics.Collections 移到 System.Classes 之前,或对其进行限定如 System.Classes.TCollectionNotification).