Why ui thread update

Community Bot 1 1 1 silver badge. If SecondThreadConcern. LongWork throws an exception, can it be caught by the UI thread? This is an excellent post, btw. I have added an additional section to the answer to fulfil your requirements. The ExceptionDispatchInfo class is responsible for that miracle of rethrowing background exception on UI thread in async-await pattern.

What's the point of creating a Task to just block the current thread? You should never block a thread pool thread! NET 4: control. Zaid Masud Zaid Masud My UI control? Trying to implement this in WPF on a label control, and Invoke is not a member of my label. What's about extension method like styxriver stackoverflow. Dbloom it's not a member because it's only for WinForms. For WPF you use Dispatcher. Invoke — sLw. I was following this solution but sometimes my UI was not getting updated.

I found that i need this. Fire and forget extension method for. StyxRiver StyxRiver 2, 1 1 gold badge 15 15 silver badges 19 19 bronze badges. What's the point of the this usage? Wouldn't "control" be equivalent? Are there any benefits to this? You could rename it to source, or whatever floats your boat. I use this , because it's referring to 'this Control' that is calling the extension and is consistent in my head, at least with using the 'this' keyword in normal non-extension code.

This is great, easy and for me the best solution. You could include all the work you have to do in the ui thread. Example: this. I really like this solution. But thats just personal taste. This is the classic way you should do this: using System; using System. Forms; using System. StartWork ; workerThread. Hath Hath The simple solution is to use Control.

MBH OregonGhost OregonGhost I really did not understand why microsoft could not make it simpler as it is meant to be! MBH Agree. BTW, did you notice stackoverflow. Do that once in a custom utilities class, then don't have to care any more that Microsoft did not do it for us : — ToolmakerSteve.

ToolmakerSteve Thats exactly what it meant to be! Sleep ; backgroundWorker1. ReportProgress 0, "A" ; Thread. ReportProgress 0, "B" ; Thread. Don Kirkby Don Kirkby Ohad Schneider Ohad Schneider 34k 10 10 gold badges silver badges bronze badges. You'll have to make sure that the update happens on the correct thread; the UI thread. In order to do this, you'll have to Invoke the event-handler instead of calling it directly.

You can do this by raising your event like this: The code is typed here out of my head, so I haven't checked for correct syntax, etc. Target as ISynchronizeInvoke; if target!

Invoke d, In order to easily raise events this way, I've created an extension method, which allows me to simplify raising an event by just calling: MyEvent. Raise this, EventArgs. Empty ; Of course, you can also make use of the BackGroundWorker class, which will abstract this matter for you. Frederik Gheysels Frederik Gheysels Indeed, but I don't like to 'clutter' my GUI code with this matter.

My GUI shouldn't care whether it needs to Invoke or not. In other words: i don't think that it is the responsability of the GUI to perform the context-swithc. Breaking the delegate apart etc seems overkill - why not just: SynchronizationContext. Do you always have access to the SynchronizationContext? Even if your class is in a class lib? Make sure you do not call BeginInvoke too frequently or it could overrun the message pump.

Calling Invoke on the worker thread is a blocking call. It will temporarily halt the work being done in that thread. The UI and worker threads remain loosely coupled as opposed to the Control. Invoke or Control. BeginInvoke approach which tightly couples them. The UI thread will not impede the progress of the worker thread. The worker thread cannot dominate the time the UI thread spends updating. The intervals at which the UI and worker threads perform operations can remain independent.

The worker thread cannot overrun the UI thread's message pump. The UI thread gets to dictate when and how often the UI gets updated.

Good idea. The only thing you didn't mention is how you properly dispose the timer once the WorkerThread is finished. Note this can cause trouble when the application ends i. Do you have an idea how to solve this? Matt Instead of using an anonymous handler for Elapsed event, you use a member method so you can remove the timer when the form is disposed Phil - Good point. You meant like System. You'll need to Invoke the method on the GUI thread. You can do that by calling Control.

Kieron Kieron The invoke line gives me a compiler error. The best overloaded method match for 'System. Invoke System. Delegate, object[] ' has some invalid arguments — CruelIO. None of the Invoke stuff in the previous answers is necessary. Jon H Jon H 3 3 silver badges 2 2 bronze badges.

Member as PropertyInfo; propInfo. Text, "some string" ; this. Visible, false ; The compiler will fail if the user passes the wrong data type. Visible, "sometext" ;. Francis Francis 3 3 silver badges 2 2 bronze badges. Tshilidzi Mudau 5, 6 6 gold badges 32 32 silver badges 45 45 bronze badges.

Frankg Frankg 2 2 silver badges 3 3 bronze badges. A 4 4 silver badges 7 7 bronze badges. This in my C 3. InvokeRequired control. Text, "Click Me!

It improves the static type-safety. Otherwise, the original is a very nice solution. To declare a fixed size buffer field, use the fixed keyword before the field type. I'm not sure if there's a practical way to so this with all the possible combinations. Social Twitter Facebook. Legal Privacy Policy Terms. Register to vote on and add code examples. Join our developer community to improve your dev skills and code like a boss! To avoid "invalid inter thread operation exception" non thread safe, not recommended.

Note: by setting the checkforillegalcrossthreadcalls property, you can indicate whether to catch unsafe operation exceptions between threads. The value of this property is true by default, that is, the inter thread unsafe operation is to catch the exception the inter thread operation is invalid. By setting the property to false, the exception is simply masked. Among the four methods introduced in this paper, the first three are thread safe and can be used in practical projects according to local conditions.

The last method is non thread safe, which can be experimented by beginners, but is not recommended. Posted by bangQ at Nov 08, - PM. Fatal Error s Home Blogs Post a blog. ThreadProcSafePost ; this.