scoped_ptr in C#
August 05, 2011
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 {}