The Windows-specific Dispatcher.BeginInvoke API method
The Windows-specific Dispatcher.BeginInvoke API method.
This API call asynchronously runs a delegate on the dispatcher-associated thread.
Questions tagged [begininvoke]
280 questions
443
votes
6 answers
What's the difference between Invoke() and BeginInvoke()
Just wondering what the difference between BeginInvoke() and Invoke() are?
Mainly what each one would be used for.
EDIT: What is the difference between creating a threading object and calling invoke on that and just calling BeginInvoke() on a…
Nathan W
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84
votes
5 answers
Dispatcher.BeginInvoke: Cannot convert lambda to System.Delegate
I'm trying to call System.Windows.Threading.Dispatcher.BeginInvoke. The signature of the method is this:
BeginInvoke(Delegate method, params object[] args)
I'm trying to pass it a Lambda instead of having to create a…
Micah
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64
votes
2 answers
How to use BeginInvoke C#
Could you explain this for me please:
someformobj.BeginInvoke((Action)(() =>
{
someformobj.listBox1.SelectedIndex = 0;
}));
Could you tell me how can I use begininvoke exactly?
What is Action type?
Why there is blank brackets ()?
And what does…
Mohammed Noureldin
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52
votes
7 answers
How to get return value when BeginInvoke/Invoke is called in C#
I've this little method which is supposed to be thread safe. Everything works till i want it to have return value instead of void. How do i get the return value when BeginInvoke is called?
public static string readControlText(Control varControl)…
MadBoy
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42
votes
1 answer
Dispatcher Invoke(...) vs BeginInvoke(...) confusion
I'm confused why I can't make this test counter application work with 2 (or more) simultaneous running countertextboxes with the use of "BeginInvoke" on my Dispatcher in the Count() method.
You can solve the issue by replacing the BeginInvoke by an…
Jerev
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35
votes
8 answers
System.Windows.Threading.Dispatcher and WinForms?
Does a System.Windows.Threading.Dispatcher work on the UI-thread of a WinForms application?
If yes, why? It is coming from WindowsBase.dll which seems to be a WPF component.
If not, how can I invoke work units back onto the UI-thread? I've found…
David Schmitt
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26
votes
13 answers
Display progress bar while doing some work in C#?
I want to display a progress bar while doing some work, but that would hang the UI and the progress bar won't update.
I have a WinForm ProgressForm with a ProgressBar that will continue indefinitely in a marquee fashion.
using(ProgressForm p = new…
Priyank Bolia
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26
votes
3 answers
Must every BeginInvoke be followed by an EndInvoke?
This page in the MS documentation, covering asynchrony in Windows Forms applications, states:
You can call EndInvoke to retrieve the return value from the delegate, if neccesary, but this is not required. (emphasis added)
This page covering the…
Cheeso
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25
votes
7 answers
Is Delegate.EndInvoke() really necessary?
I've read a couple of forums and even a stackoverflow question or two saying that Delegate.EndInvoke is necessary when using Delegate.BeginInvoke. Many of the articles I've read talking about using BeginInvoke have failed to mention using…
Achilles
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19
votes
5 answers
Invoke and BeginInvoke
Greetings,
I am developing some application in C#. At the moment I'm dealing with threading and I have a question that I have in my mind.
What is the difference between Invoke and BeginInvoke?
I read some thread and I found some useful information…
niao
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19
votes
6 answers
Anonymous method as parameter to BeginInvoke?
Why can't you pass an anonymous method as a parameter to the BeginInvoke method? I have the following code:
private delegate void CfgMnMnuDlg(DIServer svr);
private void ConfigureMainMenu(DIServer server,)
{
MenuStrip mnMnu =…
Charles Bretana
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16
votes
2 answers
Two questions about AsyncCallback and IAsyncResult pattern
Two questions on the callback pattern with AsyncCallback and IAsyncResult.
I changed the question with a code example:
using System;
using System.Collections.Generic;
using System.Text;
namespace TestAsync
{
class Program
{
private…
Gerard
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16
votes
4 answers
Will multiple Control.BeginInvoke/Invoke calls execute in order?
I need to know whether Control.BeginInvoke and Control.Invoke calls will execute in the order they are called.
I have the following scenario:
UI thread is blocked
WCF thread calls Control.BeginInvoke
WCF thread calls Control.Invoke (or possibly…
cornergraf
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12
votes
2 answers
Confused by the behavior of Dispatcher.BeginInvoke()
Could someone shed some light on an issue I'm having?
I'm working on a wpf project. The scenario is as below:
I need to pop up a window(model window) on main UI thread and then close it. These works are started from another UI thread (to deter user…
xiaoheixiaojie
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11
votes
1 answer
Can I use BeginInvoke with a MulticastDelegate?
I want to raise a series of events from my library class, but I'm worried that some event subscribers will be rude and take a long time to process some events, thus blocking the thread that is raising the events. I thought I could protect the…
Don Kirkby
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