Question

Hi i am trying to learn windows presentation foundation WPF and was trying to develop the simplest application Calculator. But i am having issue in displaying the ‘-‘ when i substract a higher value from smaller. For eg. if i do something like this “10 – 20” the output should be “-10” in the screen i.e. textbox. But it is displaying “10-“. Somehow the ‘-‘ is coming in the end. my xaml code for textbox looks like following:

    <TextBox Height="33" HorizontalAlignment="Left" Name="outputbox" 
             VerticalAlignment="Top" Width="278" 
             FontFamily="Tahoma" FontSize="18" 
             FlowDirection="righttoleft" IsReadOnly="True" />

and the code for doing substraction and display looks something like this

      if (entry1 > entry2)
      {
        outputbox.Text = (entry1 - entry2).ToString();
      }
      else 
      {
        outputbox.Text = "-" + (entry2 - entry1).ToString();
      }

while debugging it shows the proper string as “-10” but while displaying in the textbox it is showing the string “10-“. Any idea about what is missing???

Answer 1

Just remove the FlowDirection attribute from your TextBox and your result will be fine.

<TextBox Height="33" 
         HorizontalAlignment="Left" 
         Name="outputbox" VerticalAlignment="Top" 
         Width="278" 
         FontFamily="Tahoma" 
         FontSize="18"  IsReadOnly="True" />

Or you may specify FlowDirection="LeftToRight" which is the default for the TextBox