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POAsync WebApi Thread.CurrentCulture
 

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    <p>I have a self-hosted <strong>OWIN</strong> hosted <strong>Web API</strong> project providing some basic REST methods for me.</p> <p>I want to have multilingual error messages, so I use <strong>Resource</strong> files and a <strong>BaseController</strong> that sets the <strong>Thread.CurrentCulture</strong> and <strong>Thread.CurrentUICulture</strong> to the <strong>Accept-Language</strong> header of the request.</p> <pre><code>public override Task&lt;HttpResponseMessage&gt; ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken) { if (controllerContext.Request.Headers.AcceptLanguage != null &amp;&amp; controllerContext.Request.Headers.AcceptLanguage.Count &gt; 0) { string language = controllerContext.Request.Headers.AcceptLanguage.First().Value; var culture = CultureInfo.CreateSpecificCulture(language); Thread.CurrentThread.CurrentCulture = culture; Thread.CurrentThread.CurrentUICulture = culture; } base.ExecuteAsync(controllerContext, cancellationToken); } </code></pre> <p>That all works nice, but the problem appears if I make my <strong>controller methods async</strong>.</p> <p>When I use <strong>await</strong> in the method, it might continue in another thread, and so my <strong>CurrentCulture</strong> and <strong>CurrentUICulture</strong> are lost. </p> <p>Here's an little example I used to find this issue.</p> <pre><code>public async Task&lt;HttpResponseMessage&gt; PostData(MyData data) { Thread currentThread = Thread.CurrentThread; await SomeThing(); if (Thread.CurrentThread.CurrentCulture != currentThread.CurrentCulture) Debugger.Break(); } </code></pre> <p>I don't always break in the <strong>Debugger.Break</strong> line, but most of the time I do.</p> <p>Here's an example where I actually use my <strong>Resource File</strong>.</p> <pre><code>public async Task&lt;HttpResponseMessage&gt; PostMyData(MyData data) { //Before this if I'm in the correct thread and have the correct cultures if (await this._myDataValidator.Validate(data) == false) //However, I might be in another thread here, so I have the wrong cultures throw new InvalidMyDataException(); } public class InvalidMyDataException : Exception { public InvalidMyDataException() //Here I access my resource file and want to get the error message depending on the current culture, which might be wrong : base(ExceptionMessages.InvalidMyData) { } } </code></pre> <p>Some additional information: I have a whole bunch of exceptions like this, and they all get caught in an custom <em>ExceptionFilterAttribute</em> which then creates the response.</p> <p>So it would be much code to always set the culture right before I use it.</p>
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