Delphi What is the best way to sort an Array of String

You're right. There is a built in function for array of string. But not for dynamic array. It is for TStrings class:

var
  StrArray: TStrings;
begin
  StrArray:= TStringList.Create;
  try
    StrArray.Add( 'Str 1' );
    StrArray.Add( 'Str 2' );
    StrArray.Add( 'Str 3' );
    StrArray.Sort; <------------------------
  finally
    StrArray.Free;
  end;

If you are using D2010, try something like this

TArray.Sort<string>(YourArray , TDelegatedComparer<string>.Construct(
  function(const Left, Right: string): Integer
  begin
    Result := TComparer<String>.Default.Compare(Left, Right);
  end));

Here is tested example:

uses
  Generics.Defaults,
  Generics.Collections;

procedure TForm1.Button1Click(Sender: TObject);
var
  StrArray: array of string;
begin
  SetLength( StrArray, 3);
  StrArray[0]:= 'Str 3';
  StrArray[1]:= 'Str 2';
  StrArray[2]:= 'Str 1';

  TArray.Sort<string>(StrArray , TDelegatedComparer<string>.Construct(
    function(const Left, Right: string): Integer
    begin
      Result := TComparer<String>.Default.Compare(Left, Right);
    end));
end;

I am having difficulty to get it working.  I have not used TStrings before, is there a Unit to be listes in Uses for this. I added the Uses caluses that you used but get Incompatible type error in line "SetLength( StrArray, 3);"

I also get [DCC Error] SiteDesignerMainUnt.pas(9710): E2250 There is no overloaded version of 'TArray.Sort<System.string>' that can be called with these arguments for line " TArray.Sort<string>(StrArray);"

Sorry, my previous commnet = false alarm, now working.

Thanks, works great.