Rtti单元(1)获取类的方法、属性、字段的列表

通过 Rtti 单元的 TRttiContext(是个 record), 可以方便地获取类的方法、属性、字段的列表.

unit Unit1; 
 
interface 
 
uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs, StdCtrls; 
 
type 
 TForm1 = class(TForm) 
  Memo1: TMemo; 
  Button1: TButton; 
  Button2: TButton; 
  Button3: TButton; 
  Button4: TButton; 
  Button5: TButton; 
  procedure Button1Click(Sender: TObject); 
  procedure Button2Click(Sender: TObject); 
  procedure Button3Click(Sender: TObject); 
  procedure Button4Click(Sender: TObject); 
  procedure Button5Click(Sender: TObject); 
 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm}  
 
uses Rtti; 
 
//TRttiContext.GetTypes 
procedure TForm1.Button1Click(Sender: TObject); 
var 
 ctx: TRttiContext; 
 t: TRttiType; 
begin 
 Memo1.Clear; 
 for t in ctx.GetTypes do Memo1.Lines.Add(t.Name); 
end; 
 
//获取 TButton 类的方法 
procedure TForm1.Button2Click(Sender: TObject); 
var 
 ctx: TRttiContext; 
 t: TRttiType; 
 m: TRttiMethod; 
begin 
 Memo1.Clear; 
 t := ctx.GetType(TButton); 
 //for m in t.GetMethods do Memo1.Lines.Add(m.Name); 
 for m in t.GetMethods do Memo1.Lines.Add(m.ToString); 
end; 
 
//获取 TButton 类的属性 
procedure TForm1.Button3Click(Sender: TObject); 
var 
 ctx: TRttiContext; 
 t: TRttiType; 
 p: TRttiProperty; 
begin 
 Memo1.Clear; 
 t := ctx.GetType(TButton); 
 //for p in t.GetProperties do Memo1.Lines.Add(p.Name); 
 for p in t.GetProperties do Memo1.Lines.Add(p.ToString); 
end; 
 
//获取 TButton 类的字段 
procedure TForm1.Button4Click(Sender: TObject); 
var 
 ctx: TRttiContext; 
 t: TRttiType; 
 f: TRttiField; 
begin 
 Memo1.Clear; 
 t := ctx.GetType(TButton); 
 //for f in t.GetFields do Memo1.Lines.Add(f.Name); 
 for f in t.GetFields do Memo1.Lines.Add(f.ToString); 
end; 
 
//获取获取 TButton 类的方法集合、属性集合、字段集合 
procedure TForm1.Button5Click(Sender: TObject); 
var 
 ctx: TRttiContext; 
 t: TRttiType; 
 ms: TArray<TRttiMethod>; 
 ps: TArray<TRttiProperty>; 
 fs: TArray<TRttiField>; 
begin 
 Memo1.Clear; 
 t := ctx.GetType(TButton); 
 
 ms := t.GetMethods; 
 ps := t.GetProperties; 
 fs := t.GetFields; 
 
 Memo1.Lines.Add(Format('%s 类共有 %d 个方法', [t.Name, Length(ms)])); 
 Memo1.Lines.Add(Format('%s 类共有 %d 个属性', [t.Name, Length(ps)])); 
 Memo1.Lines.Add(Format('%s 类共有 %d 个字段', [t.Name, Length(fs)])); 
end; 
 
end.

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