dispatcher | 易学教程

WPF Dispatcher, Background worker and a whole lot of pain

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问题 Ok this may be really simple but everything I try just seems to hit a brick wall. I have a view model with two properties, which are bound to my WPF form: bool IsWorking {get;set;} ObservableCollection<OtherViewModel> PendingItems {get;set;} I have a method that I call to fetch some new pending items from outlook, however I also what to show some sort of progress on the form(spinning progress bar), the progress bar visibility is bound to the IsWorking property on the ViewModel, and a grid is

WPF Dispatcher.Invoke 'hanging'

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问题 I have a somewhat complex WPF application which seems to be 'hanging' or getting stuck in a Wait call when trying to use the dispatcher to invoke a call on the UI thread. The general process is: Handle the click event on a button Create a new thread (STA) which: creates a new instance of the presenter and UI, then calls the method Disconnect Disconnect then sets a property on the UI called Name The setter for Name then uses the following code to set the property: if(this.Dispatcher.Thread !=

Can't use dispatcher on WP7

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问题 I was looking around for refrences using dispatcher to call code on the UI thread and they say to do this: Dispatcher.BeginInvoke(() => {OnSendSuccessful(); }); But I get a compiler error saying I cant access non-static method BeginInvoke in a static context. Any ideas? I tried to new up a dispatcher but that doesn't even make sense. 回答1: Try using: Deployment.Current.Dispatcher.BeginInvoke(() => {OnSendSuccessful(); }); This uses a static method to get a dispatcher for use in a static

Convert a WPF dispatcher to Winforms BGworker?

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问题 i recently acquired some source code for a console wrapper for a server. The program was originaly in WPF and part of the code was: private void ServerProc_ErrorDataReceived(object sender, DataReceivedEventArgs e) { Dispatcher.Invoke(new Action(() => { ConsoleTextBlock.Text += e.Data + "\r\n"; ConsoleScroll.ScrollToEnd(); })); } private void ServerProc_OutputDataReceived(object sender, DataReceivedEventArgs e) { Dispatcher.Invoke(new Action(() => { ConsoleTextBlock.Text += e.Data + "\r\n";

How is it possible that Filter is applied when its dispatcher is FORWARD as well as when dispatcher is REQUEST?

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问题 I have a simple Filter: public class TestFilter implements Filter { public void init(FilterConfig filterConfig) throws ServletException { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println("before"); chain.doFilter(request, response); System.out.println("after"); } public void destroy() { } } It's the first filter in web.xml and it has one of these two mappings: <filter-mapping> <filter-name

DispatcherServlet-接收请求流程.md

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 上一篇： SpringMVC源码分析-DispatcherServlet-init方法分析 DispatcherServlet的init已经将所需要的各种Resolver准备好，可以说是万事俱备只欠东风了，下面就看看它是如何接收请求，并将请求映射到Controller上的方法，然后将返回值格式化为字符串或者使用视图解析器完成解析的时序图概要说明前半部分画了从Tomcat最后一个阀门（Valve）如何一步步调用到DispatcherServlet的doService方法。后半部分画了SpringMVC的处理流程，如下：在DispatcherServlet中调用getHandler()得到符合条件的HandlerMapping（如：RequestMappingRequestHandler-请求参数解析、绑定。。。在这里面还会降将该请求适合的Interceptors与handler一起封装为一个HandlerExecutionChain），接着根据得到的HandlerMapping调用getHandlerAdpater()得到符合条件的HandlerAdapter（如：RequestMappingHandlerAdapter-调用Controller中的方法，返回值格式化，确定ModleAndView）

php使用Symfony EventDispatcher 组件

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 大家好，这篇文章将通过我在实际开发工作中的例子，来介绍Symfony的EventDispatcher组件的使用及实现原理。这个组件在实际开发过程中非常的有用，它能够使代码的业务逻辑变的非常清晰，增加代码的复用性，代码的耦合性也大大降低。简介具体的介绍大家可以查看官方的文档，下面是文档地址。文档地址组成一个 dispatcher 对象，保存了事件名称和其对应监听器一个 event，有一个全局唯一的事件名称。包含一些在订阅器里需要访问的对象。使用示例 1. 初始化，添加相应监听事件 # 初始时，添加监听器 $dispatcher = new EventDispatcher(); $disptacher->addSubscriber(new BIReportSubscriber()); // BI上报功能 $disptacher->addSubscriber(new MediaPlayerSubscriber()); // 维护播放器信息统一 Symfony\Component\EventDispatcher\EventDispatcher 2. 监听的事件 class BIReportSubscriber implements EventSubscriberInterface { public

C# printing with WPF

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问题 My application prints (to a printer) the information shown on screen (using the Canvas control) N times. The process is The user clicks a button (called Print). Update the Canvas with text (normally from a database but for the code below, it's hard coded) Print to printer Update the Canvas with new text (again from a database but for the code below, it's hard coded) Print to printer However, I can't get this to work as explained in the above process- the printer only prints the last update

Envoy源码分析之Dispatcher

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Dispatcher 在Envoy的代码中 Dispatcher 是随处可见的，可以说在Envoy中有着举足轻重的地位，一个 Dispatcher 就是一个 EventLoop ，其承担了任务队列、网络事件处理、定时器、信号处理等核心功能。在 Envoy threading model 这篇文章所提到的 EventLoop ( Each worker thread runs a “non-blocking” event loop )指的就是这个 Dispatcher 对象。这个部分的代码相对较独立，和其他模块耦合也比较少，但重要性却不言而喻。下面是与 Dispatcher 相关的类图，在接下来会对其中的关键概念进行介绍。 Dispatcher 和 Libevent Dispatcher 本质上就是一个 EventLoop ，Envoy并没有重新实现，而是复用了Libevent中的 event_base ，在Libevent的基础上进行了二次封装并抽象出一些事件类，比如 FileEvent 、 SignalEvent 、 Timer 等。Libevent是一个C库，而Envoy是C++，为了避免手动管理这些C结构的内存，Envoy通过继承 unique_ptr 的方式重新封装了这些libevent暴露出来的C结构

Dispatcher.CurrentDispatcher.BeginInvoke Not Invoking

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问题 I have a FileSystemWatcher and the events raised by this when a watched file changes are raised on a different thread from the UI thread. To avoid and cross-thread acess volation fun, I am attempting to use public void RaisePathChanged(object sender, RenamedEventArgs e) { Dispatcher.CurrentDispatcher.BeginInvoke(new Action(() => { // Some code to handle the file state change here. })); } This compiles fine and the RaisePathChanged is fired as it should be. However, the code inside the

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