Best practice to do nested TRY / FINALLY statement

Question

Hi What is the best way to do nested try & finally statements in delphi?

var cds1  : TClientDataSet;
    cds2  : TClientDataSet;
    cds3  : TClientDataS         


        

Answer 1

There's another variation of the code without nested try ... finally that just occurred to me. If you don't create the components with the AOwner parameter of the constructor set to nil, then you can simply make use of the lifetime management that the VCL gives you for free:

var
  cds1: TClientDataSet;
  cds2: TClientDataSet;
  cds3: TClientDataSet;
  cds4: TClientDataSet;
begin
  cds1 := TClientDataSet.Create(nil);
  try
    // let cds1 own the other components so they need not be freed manually
    cds2 := TClientDataSet.Create(cds1);
    cds3 := TClientDataSet.Create(cds1);
    cds4 := TClientDataSet.Create(cds1);

    ///////////////////////////////////////////////////////////////////////
    ///      DO WHAT NEEDS TO BE DONE
    ///////////////////////////////////////////////////////////////////////

  finally
    cds1.Free;
  end;
end;

I'm a big believer in small code (if it's not too obfuscated).