c# - 在asp net core 3.1中使用RouteDataRequestCultureProvider

Question

从核心 2.2 升级到 3.1 后，我无法让 RouteDataRequestCultureProvider 充分工作。

路由有效，但 Razor 标签助手忽略区域性和使用区域性的路由属性。

作为自定义路由属性的简单示例:

public class StaticPageController : Controller
{
    [Route("{culture:culture}/cookies")]
    public IActionResult Cookies() => View();
}

如果我转到 URL https://localhost:5002/en/cookies 操作将正确路由到。 但是在 Razor 中，如果我使用这样的助手:

<a asp-controller="StaticPage" asp-action="Cookies">Cookie information</a>

它生成的链接是:https://localhost:5002/en/staticpage/cookies

在 core 2.2 中，这正确生成了 url https://localhost:5002/en/cookies

路由数据字典正确包含区域性条目，但 razor 助手不再使用它，并且默认为默认路由模式:

app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
            endpoints.MapControllerRoute("default", "{culture:culture}/{controller=Home}/{action=Index}/{id?}");
        });

有谁知道为什么 Razor 标签助手不再使用路线数据字典中的区域性？

编辑:

我现在知道区域性不会从路由值传递到 URL 生成器，因为它被视为环境变量，并且从核心 2.2 开始不再包含环境变量。

Route Data values for the current request are considered ambient values in ASP.NET Core 2.1 and earlier

我可以通过明确指定文化来解决这个问题:

 <a 
    asp-controller="StaticPage" 
    asp-action="Cookies" asp-route- 
    culture="@Context.Request.RouteValues["culture"]">
       Cookies
 </a>

为每个页面上的每个链接指定这一点将非常乏味。

有没有办法覆盖 tag helper自动在路由值中包含当前文化？

Answer 1

因此，我最终通过重写 anchor 标记助手的工作方式并确保它始终从路线传递文化来解决这个问题。

这是自定义标签助手:

[HtmlTargetElement("a", Attributes = ActionAttributeName)]
[HtmlTargetElement("a", Attributes = ControllerAttributeName)]
[HtmlTargetElement("a", Attributes = AreaAttributeName)]
[HtmlTargetElement("a", Attributes = PageAttributeName)]
[HtmlTargetElement("a", Attributes = PageHandlerAttributeName)]
[HtmlTargetElement("a", Attributes = FragmentAttributeName)]
[HtmlTargetElement("a", Attributes = HostAttributeName)]
[HtmlTargetElement("a", Attributes = ProtocolAttributeName)]
[HtmlTargetElement("a", Attributes = RouteAttributeName)]
[HtmlTargetElement("a", Attributes = RouteValuesDictionaryName)]
[HtmlTargetElement("a", Attributes = RouteValuesPrefix + "*")]
public class CultureAnchorTagHelper : AnchorTagHelper
{
    private const string ActionAttributeName = "asp-action";
    private const string ControllerAttributeName = "asp-controller";
    private const string AreaAttributeName = "asp-area";
    private const string PageAttributeName = "asp-page";
    private const string PageHandlerAttributeName = "asp-page-handler";
    private const string FragmentAttributeName = "asp-fragment";
    private const string HostAttributeName = "asp-host";
    private const string ProtocolAttributeName = "asp-protocol";
    private const string RouteAttributeName = "asp-route";
    private const string RouteValuesDictionaryName = "asp-all-route-data";
    private const string RouteValuesPrefix = "asp-route-";


    public CultureAnchorTagHelper(IHtmlGenerator generator, IHttpContextAccessor contextAccessor) : base(generator)
    {
        var culture = contextAccessor.HttpContext.Request.RouteValues["culture"]?.ToString() ?? "en";
        RouteValues["culture"] = culture;
    }
}

要使用它，您需要删除默认的 anchor 标记帮助程序并在 _ViewImports.cshtml 中添加您自己的 anchor 标记帮助程序:

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@removeTagHelper Microsoft.AspNetCore.Mvc.TagHelpers.AnchorTagHelper, Microsoft.AspNetCore.Mvc.TagHelpers
@addTagHelper *, Your.Assembly.Namespace //assembly name containing class above

一些有用的链接:

• anchor tag source code
• tag helpers
• extending tag helpers