C# Thread-safe Extension Method
- by Wonko the Sane
Hello All,
I may be waaaay off, or else really close. Either way, I'm currently SOL. :)
I want to be able to use an extension method to set properties on a class, but that class may (or may not) be updated on a non-UI thread, and derives from a class the enforces updates to be on the UI thread (which implements INotifyPropertyChanged, etc).
I have a class defined something like this:
public class ClassToUpdate : UIObservableItem
{
private readonly Dispatcher mDispatcher = Dispatcher.CurrentDispatcher;
private Boolean mPropertyToUpdate = false;
public ClassToUpdate() : base()
{
}
public Dispatcher Dispatcher
{
get { return mDispatcher; }
}
public Boolean PropertyToUpdate
{
get { return mPropertyToUpdate; }
set { SetValue("PropertyToUpdate", ref mPropertyToUpdate, value; }
}
}
I have an extension method class defined something like this:
static class ExtensionMethods
{
public static IEnumerable<T> SetMyProperty<T>(this IEnumerable<T> sourceList,
Boolean newValue)
{
ClassToUpdate firstClass = sourceList.FirstOrDefault() as ClassToUpdate;
if (firstClass.Dispatcher.Thread.ManagedThreadId !=
System.Threading.Thread.CurrentThread.ManagedThreadId)
{
// WHAT GOES HERE?
}
else
{
foreach (var classToUpdate in sourceList)
{
(classToUpdate as ClassToUpdate ).PropertyToUpdate = newValue;
yield return classToUpdate;
}
}
}
}
Obviously, I'm looking for the "WHAT GOES HERE" in the extension method.
Thanks,
wTs
