ASP.NET MVC（异步）CurrentCulture 未在 Controller 和 View 之间共享

Question

我有一个针对 .NET Framework 4.7.1 的 ASP.NET MVC 4 应用程序，问题是如果操作包含异步调用，控制器和视图之间无法共享文化。

我正在引用 NuGet 包 Microsoft.AspNet.Mvc 5.2.3（并且可以在 5.2.4 中复制）。

这是控制器中的代码：

public class CulturesTestController : Controller
{
    public async Task<ActionResult> Index(string value)
    {
        Thread.CurrentThread.CurrentCulture = 
            CultureInfo.GetCultureInfo("fi-FI");
        Thread.CurrentThread.CurrentUICulture = 
            CultureInfo.GetCultureInfo("fi-FI");
        var model = new CulturesContainer
        {
            CurrentCulture = Thread.CurrentThread.CurrentCulture,
            CurrentUICulture = Thread.CurrentThread.CurrentUICulture,
            CurrentThreadId = Thread.CurrentThread.ManagedThreadId
        };
        Log.Write(Level.Info, "CurrentUICulture - Before Await - " +
                              "CurrentCulture: " +
                              $"{Thread.CurrentThread.CurrentCulture}, " +
                              "CurrentUICulture: "
                              ${Thread.CurrentThread.CurrentUICulture} -> "+
                              "ThreadId: " + 
                              $"{Thread.CurrentThread.ManagedThreadId}");

        await GetAwait();
        Log.Write(Level.Info, "CurrentUICulture - After Await - " +
                              "CurrentCulture: " + 
                              $"{Thread.CurrentThread.CurrentCulture}, " +
                              "CurrentUICulture: " +
                              $"{Thread.CurrentThread.CurrentUICulture} -> " +
                              "ThreadId: " +
                              $"{Thread.CurrentThread.ManagedThreadId}");
        return View("Index", model);
    }

    public class CulturesContainer
    {
        public CultureInfo CurrentCulture { get; set; }
        public int CurrentThreadId { get; set; }
        public CultureInfo CurrentUICulture { get; set; }
    }

    private async Task GetAwait()
    {
        await Task.Yield();
    }
}

这是视图中的代码：

@using System.Globalization
@using System.Threading
@model CultureTest.Controllers.CulturesTestController.CulturesContainer
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <title>title</title>
</head>
<body>
    <div>
        InitialCurrentCulture = {
        <label>@Html.Raw(Model.CurrentCulture)</label>
        }  --
        InitialCurrentUICulture = {
        <label>@Html.Raw(Model.CurrentUICulture)</label>
        }  --
        InitialThreadId = {
        <label>@Html.Raw(Model.CurrentThreadId)</label>
        }
        <br />
        ActualCurrentCulture = {
        <label>@Html.Raw(CultureInfo.CurrentCulture)</label>
        }  --
        ActualCurrentUICulture = {
        <label>@Html.Raw(CultureInfo.CurrentUICulture)</label>
        }  --
        ActualThreadId = {
        <label>@Html.Raw(Thread.CurrentThread.ManagedThreadId)</label>
        }
    </div>
</body>
</html>

日志如下：

20180320-12:04:25.357-12   -INFO -CulturesTestController+<Index>d__0: 
    CurrentUICulture - Before Await - 
    CurrentCulture: fi-FI, CurrentUICulture: fi-FI -> ThreadId: 12
20180320-12:04:25.357-8    -INFO -CulturesTestController+<Index>d__0: 
    CurrentUICulture - After Await - 
    CurrentCulture: fi-FI, CurrentUICulture: fi-FI -> ThreadId: 8

网页显示时：

InitialCurrentCulture = { fi-FI } -- 
InitialCurrentUICulture = { fi-FI } -- InitialThreadId = { 12 } 
ActualCurrentCulture = { en-US } --
ActualCurrentUICulture = { en-US } -- ActualThreadId = { 9 }

.NET Framework < 4.6 中存在一个问题，该问题已在 4.6 中修复，但该问题似乎在 MVC 中仍然存在。

If the thread is a thread pool thread that is executing a task-based asynchronous operation and the app targets the .NET Framework 4.6 or a later version of the .NET Framework, its UI culture is determined by the UI culture of the calling thread. (Source https://msdn.microsoft.com/en-us/library/system.globalization.cultureinfo.currentuiculture(v=vs.110).aspx)

我是不是没有正确处理 CurrentCulture，或者它应该如何工作？对于 .NET Framework 4.x.

，我找不到与此问题相关的任何 post

Answer 1

Am I not correctly handling the CurrentCulture, or this is how it is supposed to work?

你不是。当前 UI 线程的文化需要在 进入异步操作方法之前 进行设置。如果您在异步方法中设置文化，它对 UI 线程没有影响（如您所见）。

但是抛开异步问题不谈，在 application lifecycle of MVC 中设置动作方法内部的文化 太迟了，因为一些重要的 culture-sensitive在那之前 MVC 的特性（即模型绑定）运行。

在生命周期中尽早设置区域性的一种方法是使用授权过滤器，这可确保在模型绑定发生之前设置区域性。

using System.Globalization; using System.Threading; using System.Web.Mvc; public class CultureFilter : IAuthorizationFilter { private readonly string defaultCulture; public CultureFilter(string defaultCulture) { this.defaultCulture = defaultCulture; } public void OnAuthorization(AuthorizationContext filterContext) { var values = filterContext.RouteData.Values; string culture = (string)values["culture"] ?? this.defaultCulture; CultureInfo ci = new CultureInfo(culture); Thread.CurrentThread.CurrentCulture = ci; Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(ci.Name); } }

并在全球注册：

public class FilterConfig { public static void RegisterGlobalFilters(GlobalFilterCollection filters) { filters.Add(new CultureFilter(defaultCulture: "fi-FI")); filters.Add(new HandleErrorAttribute()); } }

以上示例假定您已设置路由以将 culture 添加为类似于的路由值，但如果需要，您可以设计一个过滤器以从其他地方获取文化.

NOTE: I realize this question is not about .NET Core, but as @GSerg pointed out in the comments, this same issue was reported as a bug for ASP.NET Core, and it was closed as by design. The conclusion they came to was the same:

Setting the culture inside a resource filter would apply to both the action and view.

ASP.NET MVC（异步）CurrentCulture 未在 Controller 和 View 之间共享

ASP.NET MVC (Async) CurrentCulture is not shared between Controller and View

c#

asp.net-mvc

async-await

cultureinfo

currentuiculture