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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 詳測 Generics Collections TDictionary(1): Add、Items、Keys、Values、Remove

詳測 Generics Collections TDictionary(1): Add、Items、Keys、Values、Remove

編輯:Delphi

unit Unit1; 
 
interface 
 
uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs, StdCtrls; 
 
type 
 TForm1 = class(TForm) 
  Button1: TButton; 
  procedure Button1Click(Sender: TObject); 
 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm} 
 
uses Generics.Collections; 
 
procedure TForm1.Button1Click(Sender: TObject); 
var 
 Dictionary: TDictionary<string,Integer>; 
 K: string; 
 V: Integer; 
 str: string; 
begin 
 Dictionary := TDictionary<string,Integer>.Create(); 
 
 {添加} 
 Dictionary.Add('n1', 111); 
 Dictionary.Add('n2', 222); 
 Dictionary.Add('n3', 333); 
 
 {訪問} 
 ShowMessage(IntToStr(Dictionary['n2']));    {222} 
 ShowMessage(IntToStr(Dictionary.Items['n2'])); {222} 
 
 {遍歷 Keys} 
 str := ''; 
 for K in Dictionary.Keys do str := str + K + ' '; 
 ShowMessage(str); {n2 n3 n1 } //順序亂了? 
 
 {遍歷 Values} 
 str := ''; 
 for V in Dictionary.Values do str := str + IntToStr(V) + ' '; 
 ShowMessage(str); {222 333 111 } 
 
 {通過 Keys 遍歷 Values} 
 str := ''; 
 for K in Dictionary.Keys do str := str + IntToStr(Dictionary[K]) + ' '; 
 ShowMessage(str); {222 333 111 } 
 
 {刪除} 
 Dictionary.Remove('n1'); 
 str := ''; 
 for K in Dictionary.Keys do str := str + IntToStr(Dictionary[K]) + ' '; 
 ShowMessage(str); {222 333 } 
 
 {Count、Clear} 
 ShowMessage(IntToStr(Dictionary.Count)); {2} 
 Dictionary.Clear; 
 ShowMessage(IntToStr(Dictionary.Count)); {0}   
 
 Dictionary.Free; 
end; 
 
end. 


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