TStringList 常用方法与属性

var
List: TStringList;
i: Integer;
begin
List := TStringList.Create;
List.Add('Strings1'); {添加} 
List.Add('Strings2');
List.Exchange(0,1); {置换} 
List.Insert(0,'Strings3'); {插入} 
i := List.IndexOf('Strings1'); {第一次出现的位置} 
List.Sort; {排序} 
List.Sorted := True; {指定排序} 
List.Count; {总数} 
List.Text; {文本集合} 
List.Delete(0); {删除, 0是第一个数据} 
List.LoadFromFile('c:\tmp.txt');{打开} 
List.SaveToFile('c:\tmp.txt'); {保存} 
List.Clear; {清空} 
List.Free; {释放} 
end;
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//读入字符串 
var
List: TStringList;
begin
List := TStringList.Create;
List.CommaText := 'aaa,bbb,ccc,ddd';
//相当于: List.Text := 'aaa' + #13#10 + 'bbb' + #13#10' + 'ccc' + '#13#10' + 'ddd'; 

ShowMessage(IntToStr(List.Count)); //4
ShowMessage(List.Strings[0]); //aaa 跟下面句差不多 
ShowMessage(List[0]); //aaa

List.Free;
end;
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//置换分隔符 
var
List: TStringList;
begin
List := TStringList.Create;
List.Delimiter := '|';
List.DelimitedText := 'aaa|bbb|ccc|ddd';

ShowMessage(IntToStr(List.Count)); //4
ShowMessage(List[0]); //aaa

List.Free;
end;
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//类似的哈希表操作法 
var
List: TStringList;
begin
List := TStringList.Create;

List.Add('aaa=111');
List.Add('bbb=222');
List.Add('ccc=333');
List.Add('ddd=444');

ShowMessage(List.Names[1]); //bbb
ShowMessage(List.ValueFromIndex[1]); //222
ShowMessage(List.Values['bbb']); //222

//ValueFromIndex 可以赋值: 
List.ValueFromIndex[1] := '2';
ShowMessage(List[1]); //bbb=2

//可以通过 Values 赋值: 
List.Values['bbb'] := '22';
ShowMessage(List[1]); //bbb=22

List.Free;
end;
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//避免重复值 
var
List: TStringList;
begin
List := TStringList.Create;

List.Add('aaa');

List.Sorted := True; //需要先指定排序 
List.Duplicates := dupIgnore; //如有重复值则放弃 

List.Add('aaa');

ShowMessage(List.Text); //aaa

//Duplicates 有3个可选值: 
//dupIgnore: 放弃; 
//dupAccept: 结束; 
//dupError: 提示错误. 

List.Free;
end;
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//排序与倒排序 
{排序函数} 
function DescCompareStrings(List: TStringList; Index1, Index2: Integer): Integer;
begin
Result := -AnsiCompareText(List[Index1], List[Index2]);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
List: TStringList;
begin
List := TStringList.Create;

List.Add('bbb');
List.Add('ccc');
List.Add('aaa');

//未排序 
ShowMessage(List.Text); //bbb ccc aaa

//排序 
List.Sort;
ShowMessage(List.Text); //aaa bbb ccc

//倒排序 
List.CustomSort(DescCompareStrings); //调用排序函数 
ShowMessage(List.Text); //ccc bbb aaa

//假如: 
List.Sorted := True;
List.Add('999');
List.Add('000');
List.Add('zzz');
ShowMessage(List.Text); //000 999 aaa bbb ccc zzz
end;