c# – 升级到asp.net core 2.2后清空href

我们构建了一个ASP.NET Core 2.1网站,其中www.example.org/uk和www.example.org/de等网站确定了要显示的resx文件和内容.升级到ASP.NET Core 2.2后,页面加载但生成的所有链接都会产生空白/空白href.

例如,一个链接：

<a asp-controller="Home" asp-action="Contact">@Res.ContactUs</a>

将在2.2中生成一个空的href,如下所示：

<a href="">Contact us</a>

但是在2.1中我们得到了正确的href：

<a href="/uk/contact">Contact us</a>

我们使用Constraint Map来管理基于URL的语言功能 – 这是代码：

Startup.cs

// configure route options {lang}, e.g. /uk, /de, /es etc
services.Configure<RouteOptions>(options =>
{
    options.LowercaseUrls = true;
    options.AppendTrailingSlash = false;
    options.ConstraintMap.Add("lang", typeof(LanguageRouteConstraint));
 });

 ...

app.UseMvc(routes =>
{
    routes.MapRoute(
       name: "LocalizedDefault",
       template: "{lang:lang}/{controller=Home}/{action=Index}/{id?}");
}

LanguageRouteConstraint.cs

public class LanguageRouteConstraint : IRouteConstraint
{
    private readonly AppLanguages _languageSettings;

    public LanguageRouteConstraint(IHostingEnvironment hostingEnvironment)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(hostingEnvironment.ContentRootPath)
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

        IConfigurationRoot configuration = builder.Build();

        _languageSettings = new AppLanguages();
        configuration.GetSection("AppLanguages").Bind(_languageSettings);
    }

    public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection)
    {
        if (!values.ContainsKey("lang"))
        {
            return false;
        }

        var lang = values["lang"].ToString();
        foreach (Language lang_in_app in _languageSettings.Dict.Values)
        {
            if (lang == lang_in_app.Icc)
            {
                return true;
            }
        }
        return false;
    }
}

我缩小了问题但找不到解决问题的方法;
基本上在2.2.在上述IRouteConstraint匹配方法中没有设置一些参数,例如,

httpContext = null
route = {Microsoft.AspNetCore.Routing.NullRouter)

在2.1

 httpContext = {Microsoft.AspNetCore.Http.DefaultHttpContext}
 route = {{lang:lang}/{controller=Home}/{action=Index}/{id?}}

我在2.1和2.2之间的唯一区别是我改变了

var builder = new ConfigurationBuilder()
   .SetBasePath(Directory.GetCurrentDirectory())
   .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

以下(由于https://github.com/aspnet/AspNetCore/issues/4206)

 var builder = new ConfigurationBuilder()
    .SetBasePath(hostingEnvironment.ContentRootPath) // using IHostingEnvironment 
    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

有任何想法吗？

更新
根据https://docs.microsoft.com/en-us/aspnet/core/fundamentals/routing?view=aspnetcore-2.2#parameter-transformer-reference,ASP.NET Core 2.2使用EndpointRouting,而2.1使用IRouter基本逻辑.这解释了我的问题.现在,我的问题是什么代码看起来像2.2使用新的EndpointRouting？

解决方法:

// Use the routing logic of ASP.NET Core 2.1 or earlier:
services.AddMvc(options => options.EnableEndpointRouting = false)
    .SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

标签：c,asp-net-core,asp-net-core-2-2,asp-net-core-2-1
来源： https://codeday.me/bug/20190522/1152495.html