for I := mylist.count - 1 downto 0 do
begin
  if Trim(mylist[I]) = '' then
    mylist.Delete(I);
end;

请注意,for循环必须反向遍历列表,从Count-1开始向下移动到0才能使其生效.

Trim()的使用是可选的,具体取决于您是否要删除仅包含空格的字符串.将if语句更改为if mylist [I] =”然后将仅删除完全空字符串.

这是一个完整的例程,显示了代码的运行情况：

procedure TMyForm.Button1Click(Sender: TObject);
var
  I: Integer;
  mylist: TStringList;
begin
  mylist := TStringList.Create;
  try
    // Add some random stuff to the string list
    for I := 0 to 100 do
      mylist.Add(StringOfChar('y',Random(10)));
    // Clear out the items that are empty
    for I := mylist.count - 1 downto 0 do
    begin
      if Trim(mylist[I]) = '' then
        mylist.Delete(I);
    end;
    // Show the remaining items with numbers in a list Box
    for I := 0 to mylist.count - 1 do
      ListBox1.Items.Add(IntToStr(I)+' '+mylist[I]);
  finally
    mylist.Free;
  end;
end;