在我的WPF应用程序我做了一些异步通信(与服务器)。在回调函数中我最终从服务器的结果产生墨水presenter对象。这需要运行的线程是STA,这显然它目前不是。因此,我得到了以下异常:
无法创建的水墨presenter汇编定义的实例[..]调用线程必须STA,因为许多UI组件都需要这个。
目前我的异步函数调用是这样的:
公共无效SearchForFooAsync(字符串searchString) { VAR来电=新的函数功能:LT;字符串,富>(_ patientProxy.SearchForFoo); caller.BeginInvoke(searchString,新的AsyncCallback(SearchForFooCallbackMethod),NULL); }
我怎样才能让回调 - 这将做墨水presenter创作 - 是STA?或者调用的XamlReader分析在一个新的STA线程。
公共无效SearchForFooCallbackMethod(IAsyncResult的AR) { 无功富= GetFooFromAsyncResult(AR); VAR油墨presenter = XamlReader.Parse(foo.Xaml)作为油墨presenter; //&所述;! - 需要STA [..] }解决方案
您可以启动STA线程像这样:
线程的线程=新主题(MethodWhichRequiresSTA); thread.SetApartmentState(ApartmentState.STA); //设置线程STA thread.Start(); 的Thread.join(); //等待线程结束
唯一的问题是,你的结果对象必须同时在某种程度上跳水过去了。你可以使用一个私有字段为,或进入沿参数传递到线程。在这里,我在一个私有字段设置foo的数据,并启动STA线程变异油墨presenter!
私人变种FOO; 公共无效SearchForFooCallbackMethod(IAsyncResult的AR) { 富= GetFooFromAsyncResult(AR); 线程线程=新主题(ProcessInk presenter); thread.SetApartmentState(ApartmentState.STA); thread.Start(); 的Thread.join(); } 私人无效ProcessInk presenter() { VAR油墨presenter = XamlReader.Parse(foo.Xaml)作为油墨presenter; }
希望这有助于!
In my WPF application I do some async communication (with server). In the callback function I end up creating InkPresenter objects from the result from server. This requires the running thread to be STA, which apparently it currently isn't. Therefore I get the following exception:
Cannot create instance of 'InkPresenter' defined in assembly [..] The calling thread must be STA, because many UI components require this.
Currently my async function call is like this:
public void SearchForFooAsync(string searchString) { var caller = new Func<string, Foo>(_patientProxy.SearchForFoo); caller.BeginInvoke(searchString, new AsyncCallback(SearchForFooCallbackMethod), null); }How can I make the callback - which will do the InkPresenter creation - be STA? Or invoke the XamlReader parsing in a new STA thread.
public void SearchForFooCallbackMethod(IAsyncResult ar) { var foo = GetFooFromAsyncResult(ar); var inkPresenter = XamlReader.Parse(foo.Xaml) as InkPresenter; // <!-- Requires STA [..] }解决方案
You can start STA Threads like so:
Thread thread = new Thread(MethodWhichRequiresSTA); thread.SetApartmentState(ApartmentState.STA); //Set the thread to STA thread.Start(); thread.Join(); //Wait for the thread to endThe only problem is that your result object must be passed along somehow.. You can use a private field for that, or dive into passing along parameters into threads. Here I set the foo data in a private field and start up the STA Thread to mutate the inkpresenter!
private var foo; public void SearchForFooCallbackMethod(IAsyncResult ar) { foo = GetFooFromAsyncResult(ar); Thread thread = new Thread(ProcessInkPresenter); thread.SetApartmentState(ApartmentState.STA); thread.Start(); thread.Join(); } private void ProcessInkPresenter() { var inkPresenter = XamlReader.Parse(foo.Xaml) as InkPresenter; }Hope this helps!
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