dispatcher | 易学教程

How to put delay before doing an operation in WPF

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问题 I tried to use the below code to make a 2 second delay before navigating to the next window. But the thread is invoking first and the textblock gets displayed for a microsecond and landed into the next page. I heard a dispatcher would do that. Here is my snippet: tbkLabel.Text = \"two mins delay\"; Thread.Sleep(2000); Page2 _page2 = new Page2(); _page2.Show(); 回答1: The call to Thread.Sleep is blocking the UI thread. You need to wait asynchronously. Method 1: use a DispatcherTimer tbkLabel

System.Windows.Threading.Dispatcher and WinForms?

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问题 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 Control.BeginInvoke(), but it seems clumsy to create a control only to reference the originating thread. 回答1: You can use Dispatcher even in a WinForms app. If you are sure to be on a UI thread (e.g. in an button.Click handler), Dispatcher

Event system in Python

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问题 What event system for Python do you use? I\'m already aware of pydispatcher, but I was wondering what else can be found, or is commonly used? I\'m not interested in event managers that are part of large frameworks, I\'d rather use a small bare-bones solution that I can easily extend. 回答1: Wrapping up the various event systems that are mentioned in the answers here: The most basic style of event system is the 'bag of handler methods', which is a simple implementation of the Observer pattern.

Dispatcher.CurrentDispatcher vs. Application.Current.Dispatcher

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问题 What are the differences between Dispatcher.CurrentDispatcher (in System.Windows.Threading ) and Application.Current.Dispatcher (in System.Windows )? My gut tells me that Application.Current.Dispatcher will never change and is global to all threads in the current application, while Dispatcher.CurrentDispatcher may create a new instance of Dispatcher depending on the thread from which it was called. Is that correct? If it is, is the purpose of Dispatcher.CurrentDispatcher primarily for multi

No WebApplicationContext found: no ContextLoaderListener registered?

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问题 I\'m trying to create a simple Spring 3 application and have the following files. Please tell me the reason for this error Below is my web.xml <?xml version=\"1.0\" encoding=\"UTF-8\"?> <web-app xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns=\"http://java.sun.com/xml/ns/javaee\" xmlns:web=\"http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd\" xsi:schemaLocation=\"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd\" id=\"WebApp_ID\" version=\"3.0\

Run code on UI thread in WinRT

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问题 How can I run code on the UI thread in WinRT (Windows 8 Metro)? The Invoke method does not exist. 回答1: It's easier to directly get the CoreWindow from the non-UI thread. The following code will work everywhere, even when GetForCurrentThread() or Window.Current returns null . CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, <lambda for your code which should run on the UI thread>); for example: CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync

Change WPF controls from a non-main thread using Dispatcher.Invoke

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问题 I have recently started programming in WPF and bumped into the following problem. I don\'t understand how to use the Dispatcher.Invoke() method. I have experience in threading and I have made a few simple Windows Forms programs where I just used the Control.CheckForIllegalCrossThreadCalls = false; Yes I know that is pretty lame but these were simple monitoring applications. The fact is now I am making a WPF application which retrieves data in the background, I start off a new thread to make

springmvc注解开发

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ps : 这东西比较简单,用来为我们使用springboot打基础一 : 工程搭建 (一) 导包  <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> <scope>provided</scope> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency>  <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.7.RELEASE<

Change WPF controls from a non-main thread using Dispatcher.Invoke

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I have recently started programming in WPF and bumped into the following problem. I don't understand how to use the Dispatcher.Invoke() method. I have experience in threading and I have made a few simple Windows Forms programs where I just used the Control.CheckForIllegalCrossThreadCalls = false; Yes I know that is pretty lame but these were simple monitoring applications. The fact is now I am making a WPF application which retrieves data in the background, I start off a new thread to make the call to retrieve the data (from a webserver), now I want to display it on my WPF form. The thing is,