begininvoke

Why use BeginInvoke here?

由 六眼飞鱼酱① 提交于 2019-12-10 16:46:52
问题 I am looking into someone else's code and do not have much experience with anything to do with multi-threading. I came across this line of code: BeginInvoke((MethodInvoker)delegate() { btnCalibrate.PerformClick(); }); I was wondering why do this when just this would have worked: btnCalibrate.PerformClick(); Thanks for your answers. 回答1: Because if this code ran in a different thread from the one that created the button in the GUI, an exception would be thrown. Background threads cannot

Why did dispatcher BeginInvoke fail where Control BeginInvoke succeed in C# Windows Forms app?

由 空扰寡人 提交于 2019-12-10 16:26:04
问题 I originally tried to use the Dispatcher class BeginInvoke method to show a message box on the main UI thread in my C# Windows Forms app. When I used that method the message box did not appear . I set a breakpoint inside the body of the delegate I passed to BeginInvoke() and it was never hit. I tried using both an Action delegate and a MethodInvoker delegate. No luck in either case. When I used the BeginInvoke method belonging to the Form object it worked fine . Why did the Dispatch version

Winforms to WPF conversion: BeginInvoke to what?

由 无人久伴 提交于 2019-12-10 12:42:44
问题 Here's my old code from WinForms: private void ValueChanged(double inValue1, double inValue2) { //only manual mode for this driver, so that's easy. if (ValueLabel.InvokeRequired) { ValueLabel.Invoke(new MethodInvoker(delegate { ValueLabel.Text = (inValue1* inValue2/ 1000).ToString("f1"); } )); } else { ValueLabel.Text = (inValue1* inValue2/ 1000).ToString("f1"); } } Is there an easy way to convert this to be WPF friendly? So far, I have: private void KVPValueChanged(double inValue1, double

How to Unit Test BeginInvoke on an Action

由 自闭症网瘾萝莉.ら 提交于 2019-12-09 05:45:31
问题 I am looking for a way to test BeginInvoke on an Action method, since the method runs on a background thread there is no way of knowing when it actually completes or calls callback method. I am looking for a way to keep my test wait until the callback gets called before making assertions. In the following Presenter class, you can notice that I am invoking PopulateView on background thread which updates the view when data is fetched and I am trying assert the view Properties are correctly

Dispatcher.Invoke with anonymous delegate works in Silverlight but not WPF

由 老子叫甜甜 提交于 2019-12-08 15:47:01
问题 In Silverlight 4 I have a custom service class which has an asynchronous Completed event. Inside the Completed event I take the returned data and invoke a populate method via something like this: private void service_Completed(object sender, CompletedEventArgs args) { Dispatcher.BeginInvoke(() => populateInbox(args.Jobs)); } private void populateInbox(List<JobViewModel> jobs) { inbox.DataContext = jobs; } The BeginInvoke works in SL4, however when I ported it to WPF I get the following error:

To invoke a method asynchronously by using BeginInvoke and save the result in Session state

由 被刻印的时光 ゝ 提交于 2019-12-08 07:42:33
问题 I have this sample code that calls a method asynchronously using begininvoke, I'm executing this on a button click event on a webform. After the button click, the user is redirected to a different page, where the user waits for the result. The AuthorizePayment method takes a long time to run and returns a int code. I want to store that int value somewhere in session or a cookie(but not to dispaly) When I access Session to add that code, it throws null exception. How do I save this result in a

What are the different ways of implementing multithreading in .net

由 旧巷老猫 提交于 2019-12-08 05:42:23
问题 I have been fighting with multi threading for few days. I dont understand what are different ways of multithreading . I have read little bit about backgroundWorker , little bit about creating an object of thread. Yesterday I saw in delegate example to implement multithreading by calling BeginInvoke . I dont understand are these different ways of multithreading or are same working on same background class. Please help me in making it clear to me. 回答1: I like this explanations very much. Maybe

UI still non responsive after using control.begininvoke

由 爱⌒轻易说出口 提交于 2019-12-07 19:48:00
问题 i've made a C# winforms application. Now i have a form which has lots of buttons, which call huge number crunching functions whose output i update in a textbox. I call the textbox.begininvoke() method to which i pass a delegate to the function which updates the text in the textbox, however when the text is huge, the form is non responsive as i can't click on the cancel button. Isn't there any way so that the whole form remains responsive and as well the update too keeps happening. I have to

To invoke a method asynchronously by using BeginInvoke and save the result in Session state

由 我是研究僧i 提交于 2019-12-07 08:20:34
I have this sample code that calls a method asynchronously using begininvoke, I'm executing this on a button click event on a webform. After the button click, the user is redirected to a different page, where the user waits for the result. The AuthorizePayment method takes a long time to run and returns a int code. I want to store that int value somewhere in session or a cookie(but not to dispaly) When I access Session to add that code, it throws null exception. How do I save this result in a session or a cookie? Any idea? public class CreditCardAuthorizationManager { // Delegate, defines

What are the different ways of implementing multithreading in .net

由 让人想犯罪 __ 提交于 2019-12-06 16:38:03
I have been fighting with multi threading for few days. I dont understand what are different ways of multithreading . I have read little bit about backgroundWorker , little bit about creating an object of thread. Yesterday I saw in delegate example to implement multithreading by calling BeginInvoke . I dont understand are these different ways of multithreading or are same working on same background class. Please help me in making it clear to me. I like this explanations very much. Maybe they help you, too. And then, there is this article by Jon Skeet, too. any thread without a GUI is a
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