Delphi StringBuilder [英] Delphi StringBuilder

问题描述

在Delphi中存在像Java或C＃StringBuilder这样的东西？或者Delphi不需要StringBuilder和 s：= s +'一些字符串'; 是很好的表达式（主要是for，while循环）。

是的，Delphi提供TStringBuilder（自2009版本）：

  procedure TestStringBuilder; 
 var 
 I：整数; 
 StringBuilder：TStringBuilder; 
 begin 
 StringBuilder：= TStringBuilder.Create; 
尝试
为I：= 1到10 do 
 begin 
 StringBuilder.Append（'a string'）; 
 StringBuilder.Append（66）; //添加一个整数
 StringBuilder.Append（sLineBreak）; //添加新行
 end; 
 
 OutputWriteLine（'Final string builder length：'+ 
 IntToStr（StringBuilder.Length））; 
 finally 
 StringBuilder.Free; 
结束
结束
  

更多信息（基准）：

http://www.monien.net/blog/index.php/2008/10/delphi-2009-tstringbuilder/

是的，你是对的。 s：= s +'text'; 并不比使用TStringBuilder慢得多。

Exists in Delphi something like the Java or C# StringBuilder? Or Delphi does not need StringBuilder and s := s + 'some string'; is good expression (mainly in for, while loops).

解决方案

Yes, Delphi offers TStringBuilder (since version 2009):

procedure TestStringBuilder;
var
  I: Integer;
  StringBuilder: TStringBuilder;
begin
  StringBuilder := TStringBuilder.Create;
  try
    for I := 1 to 10 do
    begin
      StringBuilder.Append('a string ');
      StringBuilder.Append(66); //add an integer
      StringBuilder.Append(sLineBreak); //add new line
    end;

    OutputWriteLine('Final string builder length: ' +
                    IntToStr(StringBuilder.Length));
  finally
    StringBuilder.Free;
  end;
end;

Further information (benchmark):
http://www.monien.net/blog/index.php/2008/10/delphi-2009-tstringbuilder/.

And yes, you are right. s := s + 'text'; isn't really slower than using TStringBuilder.

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