ASP.NET WebApi 中异步调用的本地化

Question

嗨——我计划根据“Accept-Language”标头处理服务器端本地化的错误字符串等，方法是根据该标头设置 CurrentUICulture，但显然它不会通过异步调用，下面是一个示例代码来说明问题，是否有任何默认方式来处理异步调用的本地化？

   public async Task<HttpResponseMessage> GetAsync()
    {            
        //set the current ui culture, to say "fr-FR", based on "Accept-Language" header
        Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo("**fr-FR**");  

       var task = httpClient.PutAsync(endpoint, content)            

        //do some processing

        var res  = await task;

        var culture = Thread.CurrentThread.CurrentUICulture.Name; **//ITS NOT necessarily fr-FR**

        //do some more processing
        //and handle localizations etc.

        return res;
    }

我正在寻找一种更清洁/无缝的方式来处理本地化，以应对存在真正异步操作的情况，尤其是。对于等待调用之后的代码

编辑：为清楚起见，将 Task.Run() 替换为 httpClient.PutAsync

Answer 1

Task.Run 和 Task.Factory.StartNew 没有任何上下文。这是预期的行为。当您使用 await 关键字时，上下文会被保留。所以你可以这样做：

public static async Task<IEnumerable<string>> GetAsync()
{            
    //set the current ui culture, to say "fr-FR", based on "Accept-Language" header
    Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo("fr-FR");

    //do some processing

    var s = await GetSomething();

    var culture = Thread.CurrentThread.CurrentUICulture.Name; //It's ja-JP

    return new[] { s, s };
}

public static Task<string> GetSomething()
{
    var cuture = Thread.CurrentThread.CurrentUICulture.Name; // It's fr-FR
    var tcs = new TaskCompletionSource<string>();
    Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo("ja-JP");
    tcs.SetResult("<something>");
    return tcs.Task;
}