unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, System.JSON, system.Rtti;
type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
Button2: TButton;
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
TPerson = class
private
FName: string;
FAge: Integer;
FSex: string;
public
property Name: string read FName write FName;
property Age: Integer read FAge write FAge;
property Sex: string read FSex write FSex;
// 可以新增一些方法來測試 RTTI 遍歷
procedure SayHello;
function GetFullName: string;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TPerson.SayHello;
begin
WriteLn('Hello, my name is ' + FName);
end;
function TPerson.GetFullName: string;
begin
Result := FName + ' (' + FSex + ', ' + IntToStr(FAge) + ' years old)';
end;
procedure TForm1.Button2Click(Sender: TObject);
var
Context: TRttiContext;
RttiType: TRttiType;
Method: TRttiMethod;
begin
try
Context := TRttiContext.Create;
try
RttiType := Context.GetType(TPerson);
for Method in RttiType.GetMethods do
begin
Memo1.Lines.Add('Method: ' + Method.Name);
// 這裡可以進一步處理每個方法,比如呼叫它
end;
finally
Context.Free;
end;
except
on E: Exception do
WriteLn(E.ClassName, ': ', E.Message);
end;
end;
end.
我們通常都是希望從子類裡找到某一個方法,他優先子類這樣效率就高些;
在開發中,儘量使用 RttiType.GetMethods 一次性找出 你需要的方法,而不是透過 RttiType.GetMethod('SayHello'); 逐個去獲取,
因為 逐個獲取 每一個方法 他內部都得遍歷一次,不如直接遍歷一次 得到所有 效率高;