Threads and Tasks are unfortunately a big mystery for me.
Must create DependencySource on same Thread as the DependencyObject.
I am trying to avoid a freezing UI. My approach was doing work in a thread and setting properties later with output from the thread.
I've a base class for a Job. Basically it's a wrapper that starts a new thread with an Input and Output variable. I start a new thread, wait until the job is done and try to set it to my property MyFoo. But this won't work. See above quoted error message.
How can I use a thread* without blocking the UI and set the result to an property in WPF?
* I actually don't care if it is a thread, a task or whatever as long as it is not blocking my UI.
// ...
FooJob job = new FooJob {Input = input};
job.Start();
while (!job.IsDone) Wait(0.05);
MyFoo = (BitmapSource) job.Output;
What I've tried is to set the output to my field instead of my Property and call OnPropertyChanged manually.
Here the actual wrapper class
public class Job {
public object Output;
public object Input;
private bool _isDone;
private readonly object _handle = new object();
private Thread _thread;
public bool IsDone {
get {
bool tmp;
lock (_handle) {
tmp = _isDone;
}
return tmp;
}
set {
lock (_handle) {
_isDone = value;
}
}
}
public virtual void Start() {
_thread = new Thread(Run);
_thread.Start();
}
protected virtual void ThreadFunction() {}
private void Run() {
ThreadFunction();
IsDone = true;
}
}
