synchronizationcontext | 易学教程

【翻译】Understanding SynchronizationContext

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原文： http://www.codeproject.com/Articles/31971/Understanding-SynchronizationContext-Part-I 理解 SynchronizationContext SynchronizationContext - MSDN Lets You Down 我也不知道为什么，但实际上事实就是这样——.NET框架中没有太多的对这个类描述。MSDN文档也只有少量的关于如何使用SynchronizationContext的信息。我必须说，为了理解和学习如何使用它，我经历了一段痛苦的时间。通过阅读大量的相关文章，我终于理解了这个类的意图以及怎么正确的使用它。现在，我决定把写下这偏文章，不管它能不能帮助到你。 Using SynchronizationContext to Marshal Code from One Thread to Another Let's get some technical points out of the way so we can show how to use this class，通过SynchronizationContext，可以使两个线程之间通信。假设现在有 2个线程，Thread1 和 Thread2。Thread1 正在工作，现在Thread1 想让Thread2执行一段代码

.Net core & SynchronizationContext & Thread.SetData

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来源： https://stackoverflow.com/questions/57260837/net-core-synchronizationcontext-thread-setdata

.Net core & SynchronizationContext & Thread.SetData

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来源： https://stackoverflow.com/questions/57260837/net-core-synchronizationcontext-thread-setdata

How do I fix the deadlock on a threadpool thread that has a SynchronizationContext?

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问题 I am getting intermittent deadlocks when using HttpClient to send http requests and sometimes they are never returning back to await SendAsync in my code. I was able to figure out the thread handling the request internally in HttpClient / HttpClientHandler for some reason has a SynchronizationContext during the times it is deadlocking. I would like to figure out how the thread getting used ends up with a SynchronizationContext , when normally they don't have one. I would assume that whatever

Semaphore Wait vs WaitAsync in an async method

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问题 I'm trying to find out what is the difference between the SemaphoreSlim use of Wait and WaitAsync, used in this kind of context: private SemaphoreSlim semaphore = new SemaphoreSlim(1); public async Task<string> Get() { // What's the difference between using Wait and WaitAsync here? this.semaphore.Wait(); // await this.semaphore.WaitAsync() string result; try { result = this.GetStringAsync(); } finally { this.semaphore.Release(); } return result; } 回答1: If you have async method - you want to

What does 'context' exactly mean in C# async/await code?

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问题 Lets looks at some simple C# async/await code where I have an object reference ( obj ) before and after an await with ConfigureAwait(false) private async Task<SomeObject> AnAsyncLibraryMethod(SomeObject obj) { Console.WriteLine(Thread.CurrentThread.ManagedThreadId); obj.Name = "Harry"; // <-- obj here // MAIN POINT var newSubObj = await FetchOverHttpAsync().ConfigureAwait(false); // Continuation here Console.WriteLine(Thread.CurrentThread.ManagedThreadId); obj.Name = "Sally"; // <-- same obj

Workaround for issue in .NET 4.0 where SynchronizationContext.Current is null

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问题 What is a workaround for the issue where the SynchronizationContext.Current is null unexpectedly on the main thread in .NET 4.0? See: SynchronizationContext.Current is null in Continuation on the main UI thread 回答1: I created several extension methods that matched ContinueWith and StartNew except that they also take an additional SyncronizationContext . I then use this argument to restore the expected SynchronizationContext before executing the action: Below, I've given examples: public

Workaround for issue in .NET 4.0 where SynchronizationContext.Current is null

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.NET: How do I invoke a delegate on a specific thread? (ISynchronizeInvoke, Dispatcher, AsyncOperation, SynchronizationContext, etc.)

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问题 Note first of all that this question is not tagged winforms or wpf or anything else GUI-specific. This is intentional, as you will see shortly. Second, sorry if this question is somewhat long. I try to pull together various bits of information floating around here and there so as to also provide valuable information. My question, however, is right under "What I would like to know". I'm on a mission to finally understand the various ways offered by .NET to invoke a delegate on a specific

.NET: How do I invoke a delegate on a specific thread? (ISynchronizeInvoke, Dispatcher, AsyncOperation, SynchronizationContext, etc.)

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