c# - 使用终结点路由时不支持使用 'UseMvc' 配置 MVC

Question

我有一个 Asp.Net core 2.2 项目。

最近，我将版本从 .net core 2.2 更改为 .net core 3.0 Preview 8。此更改后我看到此警告消息:

using 'UseMvc' to configure MVC is not supported while using Endpoint Routing. To continue using 'UseMvc', please set 'MvcOptions.EnableEndpointRouting = false' inside 'ConfigureServices'.

我知道通过将 EnableEndpointRouting 设置为 false 我可以解决这个问题，但我需要知道解决它的正确方法是什么以及为什么 Endpoint Routing 不需要 UseMvc() 函数。

Answer 1

我在以下官方文档“Migrate from ASP.NET Core 2.2 to 3.0”中找到了解决方案:

有3种方法:

1. Replace UseMvc or UseSignalR with UseEndpoints.

在我的例子中，结果是这样的

  public class Startup
{

    public void ConfigureServices(IServiceCollection services)
    {
        //Old Way
        services.AddMvc();
        // New Ways
        //services.AddRazorPages();
    }


    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseStaticFiles();
        app.UseRouting();
        app.UseCors();

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

    }
}

OR
2. Use AddControllers() and UseEndpoints()

public class Startup
{

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers();
    }


    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseStaticFiles();
        app.UseRouting();
        app.UseCors();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });

    }
}

OR
3. Disable endpoint Routing. As the exception message suggests and as mentioned in the following section of documentation: use mvcwithout endpoint routing

services.AddMvc(options => options.EnableEndpointRouting = false);
//OR
services.AddControllers(options => options.EnableEndpointRouting = false);