Saturday, April 07, 2012

Using common code in a LightSwitch application

As soon as you need to repeat several lines of code in 2 screens it is time to move it to a single method and call this method instead of copy pasting the code in several screens.But you cannot simply add a class (be it VB.NET or C#) in a LightSwitch project. However there is an application class in which you can add your new method.

To add a common method to the LS application:

  • In Visual Studio right click on the LS project, in the dropdown menu choose ‘View Application Code (Client)
    image
  • In the Application class, add your method.
    namespace LightSwitchApplication



    {



        public partial class Application



        {



            public void MyCommonMethod()



            {



                //write your common code here



            }





  • In each screen that needs to use this method, e.g. in a button execute method, call the method from the Application object.





    partial void MyButton_Execute()



    {



        try



        {



            Application.MyCommonMethod();



        }



        catch (Exception ex)



        {



            this.ShowMessageBox(ex.Message);



        }



    }




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