Could someone please help me converting Delphi to C#

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C#

Could somebody please help me to convert the following function into C#

function TAclasencode.BufToDataBIN(const Buf: TByteDynArray; iStartPos,
  iLen, iDec: Integer): Variant;
const
  DefaultLen = 8;
var
  i : Integer;
  iTmp   : Int64;
  arr    : array[0..7]of Byte;
  pInt64 : ^Int64;
  fTmp   : Double;
begin
   fTmp  := 0;
   try
       FillChar(arr,8,0);
       if (Buf[iStartPos] and $80=$80) and (not IsCardinal) then
       begin                                                                 
           if Negative then
           begin
              for I:=0 to iLen-2 do arr[I]:=(Buf[iStartPos+iLen-1-I] xor $FF);
              pInt64:=@arr[0];
              iTmp:=pInt64^+1;
           end else
           begin
              for I:=0 to iLen-2 do arr[I]:=(Buf[iStartPos+iLen-1-I]);
              pInt64:=@arr[0];
              iTmp:=pInt64^;
           end;
           fTmp:=iTmp;
           fTmp:=fTmp/Power(10,iDec);
           fTmp:=0-fTmp;
       end else
       begin
           for I:=0 to iLen-1 do arr[I]:=(Buf[iStartPos+iLen-1-I]);
           pInt64:=@arr[0];
           iTmp:=pInt64^;
           fTmp:=iTmp;
           fTmp:=fTmp/Power(10,iDec);
       end;
   finally
       Result := fTmp;
   end;
end;

Thanks

[edit]Code block added - OriginalGriff[/edit]