ASP.NET Core如何自动生成小写的破折号路由

默认情况下，ASP.NET Core使用如 http://localhost:5000/HomeIndex 类的大驼峰路由。但是如果想使用小写的路由，并且这些路由用破折号分隔：http://localhost:5000/home-index它们比较常见且一致。

举例.NET常见路由
http://localhost:5000/User/ListPages
想要的效果
http://localhost:5000/user/list-pages

1、如何生成小写的路由可以这样设置

services.ConfigureRouting(setupAction => {
    setupAction.LowercaseUrls = true;
});

2、生成带破折号并且小写的路由可以这样设置

[Route("dashboard-settings")]
class DashboardSettings:Controller {
    public IActionResult Index() {
        // ...
    }
}

似乎上面使用特性路由可以解决这个问题。但是我不想使用，因为每个action都要手动去设置，太繁琐也很容易出错。

我想要的效果是在程序中写个扩展类做到可配置处理。

3、解决方案

以下支持Asp.Net Core Version>=2.2

要做到这一点，首先创建SlugifyParameterTransformer类应该如下所示

public class SlugifyParameterTransformer : IOutboundParameterTransformer
{
    public string TransformOutbound(object value)
    {
        // Slugify value
        return value == null ? null : Regex.Replace(value.ToString(), "([a-z])([A-Z])", "$1-$2").ToLower();
    }
}

3.1 对于Asp.Net Core2.2 MVC:

在StartUp中ConfiregeServices这样配置

services.AddRouting(option =>
{
    option.ConstraintMap["slugify"] = typeof(SlugifyParameterTransformer);
});

路由如下配置：

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

3.2  对于Asp.Net Core2.2 Web API:

在StartUp中ConfiregeServices这样配置

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc(options => 
    {
        options.Conventions.Add(new RouteTokenTransformerConvention(new SlugifyParameterTransformer()));
    }).SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
}

3.3 对于Asp.Net Core>=3.0 MVC:

在StartUp中ConfiregeServices这样配置

services.AddRouting(option =>
{
    option.ConstraintMap["slugify"] = typeof(SlugifyParameterTransformer);
});

路由如下配置：

app.UseEndpoints(endpoints =>
{
    endpoints.MapAreaControllerRoute(
        name: "AdminAreaRoute",
        areaName: "Admin",
        pattern: "admin/{controller:slugify=Dashboard}/{action:slugify=Index}/{id:slugify?}");

    endpoints.MapControllerRoute(
        name: "default",
        pattern: "{controller:slugify}/{action:slugify}/{id:slugify?}",
        defaults: new { controller = "Home", action = "Index" });
});

3.4 对于Asp.Net Core>=3.0 Web API:

在StartUp中ConfiregeServices这样配置

services.AddControllers(options => 
{
    options.Conventions.Add(new RouteTokenTransformerConvention(new SlugifyParameterTransformer()));
});

3.5 对于Asp.Net Core>=3.0 Razor Pages:

在StartUp中ConfiregeServices这样配置

services.AddRazorPages(options => 
{
    options.Conventions.Add(new PageRouteTransformerConvention(new SlugifyParameterTransformer()));
});

这样会使/Sys/UserList路由变为/sys/user-list

3.6 对于上面MVC项目，路由模板要调整很多，其实还可以通过实现IControllerModelConvention来实现。

public class DashedRoutingConvention : IControllerModelConvention
 {
        public void Apply(ControllerModel controller)
        {
            var hasRouteAttributes = controller.Selectors.Any(selector =>
                                               selector.AttributeRouteModel != null);
            if (hasRouteAttributes)
            {
                // This controller manually defined some routes, so treat this 
                // as an override and not apply the convention here.
                return;
            }

            foreach (var controllerAction in controller.Actions)
            {
                foreach (var selector in controllerAction.Selectors.Where(x => x.AttributeRouteModel == null))
                {
                    var template = new StringBuilder();

                    if (controllerAction.Controller.ControllerName != "Home")
                    {
                        template.Append(PascalToKebabCase(controller.ControllerName));
                    }

                    if (controllerAction.ActionName != "Index")
                    {
                        template.Append("/" + PascalToKebabCase(controllerAction.ActionName));
                    }

                    selector.AttributeRouteModel = new AttributeRouteModel()
                    {
                        Template = template.ToString()
                    };
                }
            }
        }

        public static string PascalToKebabCase(string value)
        {
            if (string.IsNullOrEmpty(value))
                return value;

            return Regex.Replace(
                value,
                "(?<!^)([A-Z][a-z]|(?<=[a-z])[A-Z])",
                "-$1",
                RegexOptions.Compiled)
                .Trim()
                .ToLower();
        }
}

在StartUp中ConfiregeServices这样配置

public void ConfigureServices(IServiceCollection services)
{
    // Add framework services.
    services.AddMvc(options => options.Conventions.Add(new DashedRoutingConvention()));
}

译文：https://stackoverflow.com/questions/40334515/automatically-generate-lowercase-dashed-routes-in-asp-net-core