scoped_ptr in C#

 

Is there a better way? Or at least a more generic way to leverage the dispose pattern? Well here’s one I thought of tonight

 

   1:      public class ScopeMngr : IDisposable
   2:      {        
   3:          private Action _dispose = null;
   4:   
   5:          public ScopeMngr(Action init, Action dispose)
   6:              : this(dispose)
   7:          {
   8:              init();            
   9:          }
  10:   
  11:          public ScopeMngr(Action dispose)
  12:          {
  13:              _dispose = dispose;
  14:          }
  15:   
  16:          public void Dispose()
  17:          {
  18:              if (_dispose != null)
  19:              {
  20:                  _dispose();
  21:                  _dispose = null;
  22:              }
  23:          }
  24:      }

Sample usage:

   1:      public partial class Form1 : Form
   2:      {
   3:          public Form1()
   4:          {
   5:              InitializeComponent();
   6:          }
   7:   
   8:          private void button1_Click(object sender, EventArgs e)
   9:          {
  10:              using (var sm = new ScopeMngr(() => Cursor = Cursors.WaitCursor, () => Cursor = Cursors.Default))
  11:              {
  12:                  Thread.Sleep(TimeSpan.FromSeconds(10));
  13:              }
  14:   
  15:              bool updating = false;
  16:              using (var sm = new ScopeMngr(() => updating = true, () => updating = false))
  17:              {
  18:                  // updating is true here
  19:                  // update the UX etc.
  20:              }
  21:              // updating is false here
  22:   
  23:          }
  24:      }

 

P.s. I know creating an object to reset a boolean is a bit of overkill, but see my comments and argument for same in my c++ post 


Enjoy.

p.s. you could also just use a try {} finally {}

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