dispatcher | 易学教程

Dispatcher: abort dispatcher operation

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问题 I want adding items to DataGrid in thread. I have view model for my user control: public class Contact { public string Name { get; set; } public string Phone { get; set; } } public class ContactGridViewModel { public ContactGridViewModel() { Items = new ObservableCollection<Contact>(); } public ObservableCollection<Contact> Items { get; private set; } public Dispatcher Dispatcher { get { return Dispatcher.CurrentDispatcher); } } private DispatcherOperation LastOperation { get; set; } public

“Must create DependencySource on same Thread as the DependencyObject” When Create GridView

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问题 I have a problem with thread.When I want set a GridView into a ListView as View in another thread.It display a message which said: Must create DependencySource on same Thread as the DependencyObject. // Create grid view GridView grid = new GridView(); // Add column // Name grid.Columns.Add((GridViewColumn)myresourcedictionary["gridDirFileName"]); // Type grid.Columns.Add((GridViewColumn)myresourcedictionary["gridDirFileType"]); // Data Modified grid.Columns.Add((GridViewColumn

WPF: Accessing bound ObservableCollection fails althouth Dispatcher.BeginInvoke is used

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I have the following: public ICollectionView Children { get { // Determining if the object has children may be time-consuming because of network timeouts. // Put that in a separate thread and only show the expander (+ sign) if and when children were found ThreadPool.QueueUserWorkItem(delegate { if (_objectBase.HasChildren) { // We cannot add to a bound variable in a non-UI thread. Queue the add operation up in the UI dispatcher. // Only add if count is (still!) zero. Application.Current.Dispatcher.BeginInvoke(new Action(() => { if (_children.Count == 0) { _children.Add(DummyChild);

Spring 3.0 junit test DispatcherServlet

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问题 I am trying to test my application with junit. Therefore I've setup the following class: @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "/META-INF/spring/applicationContext-test.xml" ) @TransactionConfiguration @Transactional public class DispatcherServletTest extends AbstractJUnit4SpringContextTests { private MockHttpServletRequest request; private MockHttpServletResponse response; private DispatcherServlet dispatcher; @Before public void setUp() throws Exception {

SpringBoot之DispatcherServlet详解及源码解析

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在使用SpringBoot之后，我们表面上已经无法直接看到DispatcherServlet的使用了。本篇文章，带大家从最初DispatcherServlet的使用开始到SpringBoot源码中DispatcherServlet的自动配置进行详解。 DispatcherServlet简介 DispatcherServlet是前端控制器设计模式的实现，提供了Spring Web MVC的集中访问点，而且负责职责的分派，而且与Spring Ioc容器无缝集成，从而可以获得Spring的所有好处。 DispatcherServlet作用 DispatcherServlet主要用作职责调度工作，本身主要用于控制流程，主要职责如下：文件上传解析，如果请求类型是multipart将通过MultipartResolver进行文件上传解析；通过HandlerMapping，将请求映射到处理器（返回一个HandlerExecutionChain，它包括一个处理器、多个HandlerInterceptor拦截器）；通过HandlerAdapter支持多种类型的处理器(HandlerExecutionChain中的处理器)；通过ViewResolver解析逻辑视图名到具体视图实现；本地化解析；渲染具体的视图等；

Pause a window like MessageBox.Show()

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I have a scripting language implemented in WPF that allows a user to script multiple concurrent actions. These actions are implemented using async/await and all of them run on the main thread. I'm now introducing a step debugger into this script language. Currently, there is one window associated with the script engine and a different window for the step debugger. I'm trying to accomplish stopping processes in the engine window just before a scripted action executes while not blocking interactivity on the debugger window. MessageBox.Show() works great for this especially because it pauses

WPF Dispatcher Invoke return value is always null

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问题 I have a call to a method that returns a UIElement that I call using the Dispatcher , below is the code. However the return value of the Dispatcher invoke is always NULL, any ideas? void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { var slides = (IList<UIElement>)e.Argument; var bmpSlides = new List<UIElement>(); var imageService = new ImageService(); int count = 0; foreach (UIElement slide in slides) { object retVal = slide.Dispatcher.Invoke( new ThreadStart(() => imageService

How to use DispatcherListener in Struts 2

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There is a interface DispatcherListener in Struts2. The docs says "A interface to tag those that want to execute code on the init and destroy of a Dispatcher ." But how to use this interface. If I create a class that implements this interface, how should I configure it to Struts2? When a Dispatcher is instantiated, it could send to the listener notification when it's initialized or destroyed. The reference and code samples are from here . The simple usage is to instantiate a bean by the container via bean tag and add themselves in the init method and remove themselves when destroyed like it

dispatch-servlet.xml与applicationContext.xml

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spring的配置文件：applicationContext.xml定义的是“root webapp context”,直译过来就是根应用上下文。（一般配置bean、数据库连接、事务、shiro、开启任务task配置等等) springmvc的配置文件：dispatcher-servlet.xml定义一个servlet的应用上下文，是applicationContext.xml上下文的子类。（一般配置视图解析器、扫描指定的包中的类上的注解、添加静态资源访问的支持等等）在初始化时，applicationContext.xml首先初始化，而dispatcher-servlet.xml在对应的servlet实例化时启动，因此applicationContext.xml初始化在前，而dispatcher-servlet.xml初始化在后。 dispatcher-servlet.xml中的bean可以引用父类applicationContext.xml上下文中的bean，反之不可以来源： oschina 链接： https://my.oschina.net/u/2351011/blog/2873188

WPF: how to invoke a method in a separate thread with a delay time

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I have a TextBox that user can enter search-term in it. Its bind to string Term property in my view-model . And I want to do a search query when its content changed. But I want to do the query in a separate thread with a delay . e.g. when user type a letter, I want to wait for 0.3 second , and if user change the input within this time (0.3 second), the timer resets and starts again. Otherwise, I start a new thread and do the search query. While query is executing, if user change the term again, abort prev query and start again. I know how to do this in windows-forms with threading and Timer