Question

我在这里https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-3.0&tabs=visual-studio#mvc-service-registration

遵循本指南

但是失败了，所以我用.net 2.2创建了一个新项目（只有一个控制器的空而新鲜的项目），然后尝试迁移到3.0。而且我又失败了，尤其是在Startup.cs中，DI无法检测到方法services.AddMvc（）;

似乎我的代码仍然引用.net 2.2而不是.net 3.0

如果我运行.net watch run

我收到此错误：

应用程序启动异常System.InvalidOperationException：   端点路由不支持“ IApplicationBuilder.UseMvc（...）”。   要使用“ IApplicationBuilder.UseMvc”设置   里面的'MvcOptions.EnableEndpointRouting = false'   'ConfigureServices（...）。在   Microsoft.AspNetCore.Builder.MvcApplicationBuilderExtensions.UseMvc（IApplicationBuilder   应用程序，操作1 configureRoutes) at Microsoft.AspNetCore.Builder.MvcApplicationBuilderExtensions.UseMvc(IApplicationBuilder app) at netmig.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env) in E:\testapp\netmig\Startup.cs:line 46 at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder) at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.<Build>b__0(IApplicationBuilder builder) at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.<UseStartup>b__2(IApplicationBuilder app) at Microsoft.AspNetCore.Mvc.Filters.MiddlewareFilterBuilderStartupFilter.<>c__DisplayClass0_0.<Configure>g__MiddlewareFilterBuilder|0(IApplicationBuilder builder) at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.<Configure>b__0(IApplicationBuilder app) at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken) Unhandled exception. System.InvalidOperationException: Endpoint Routing does not support 'IApplicationBuilder.UseMvc(...)'. To use 'IApplicationBuilder.UseMvc' set 'MvcOptions.EnableEndpointRouting = false' inside 'ConfigureServices(...). at Microsoft.AspNetCore.Builder.MvcApplicationBuilderExtensions.UseMvc(IApplicationBuilder app, Action 1 configureRoutes）位于   Microsoft.AspNetCore.Builder.MvcApplicationBuilderExtensions.UseMvc（IApplicationBuilder   app）在netmig.Startup.Configure（IApplicationBuilder app，   IHostingEnvironment env），位于E：\ testapp \ netmig \ Startup.cs：第46行   System.RuntimeMethodHandle.InvokeMethod（对象目标，对象[]   参数，签名sig，布尔构造函数，布尔wrapExceptions）   在System.Reflection.RuntimeMethodInfo.Invoke（Object obj，BindingFlags   invokeAttr，活页夹活页夹，Object []参数，CultureInfo文化）
  在Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke（Object   例如IApplicationBuilder构建器）   Microsoft.AspNetCore.Hosting.ConfigureBuilder。<> c__DisplayClass4_0.b__0（IApplicationBuilder   建筑商）   Microsoft.AspNetCore.Hosting.GenericWebHostBuilder。<> c__DisplayClass13_0.b__2（IApplicationBuilder   应用）   Microsoft.AspNetCore.Mvc.Filters.MiddlewareFilterBuilderStartupFilter。<> c__DisplayClass0_0.g__MiddlewareFilterBuilder | 0（IApplicationBuilder   建筑商）   Microsoft.AspNetCore.HostFilteringStartupFilter。<> c__DisplayClass0_0.b__0（IApplicationBuilder   应用）   Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync（CancellationToken   cancelToken）   Microsoft.Extensions.Hosting.Internal.Host.StartAsync（CancellationToken   cancelToken）   Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync（IHost   主机，CancellationToken令牌）位于   Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync（IHost   主机，CancellationToken令牌）位于   Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run（IHost   主机）在netmig.Program.Main（String [] args）中   E：\ testapp \ netmig \ Program.cs：line 18 watch：退出并显示错误代码   -532462766

我的代码在https://github.com/callmeblessed/netmig

中

我的.net信息

dotnet --info .NET Core SDK（反映任何global.json）：版本：
  3.0.100提交：04339c3a26

运行时环境：操作系统名称：Windows操作系统版本：   10.0.18362操作系统平台：Windows RID：win10-x64基本路径：C：\ Program Files \ dotnet \ sdk \ 3.0.100 \

主机（可用于支持）：版本：3.0.0提交：7d57652f33

.NET Core SDK已安装：     2.2.401 [C：\ Program Files \ dotnet \ sdk]     3.0.100 [C：\ Program Files \ dotnet \ sdk]

.NET Core运行时已安装：Microsoft.AspNetCore.All 2.2.6   [C：\ Program Files \ dotnet \ shared \ Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.2.6 [C：\ Program   Files \ dotnet \ shared \ Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0 [C：\ Program   Files \ dotnet \ shared \ Microsoft.AspNetCore.App] Microsoft.NETCore.App   2.2.6 [C：\ Program Files \ dotnet \ shared \ Microsoft.NETCore.App] Microsoft.NETCore.App 3.0.0 [C：\ Program   Files \ dotnet \ shared \ Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0 [C：\ Program   Files \ dotnet \ shared \ Microsoft.WindowsDesktop.App]

要安装其他.NET Core运行时或SDK，请执行以下操作：
  https://aka.ms/dotnet-download

Answer 1

对于v2.2

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        app.UseMvc();
    }

对于v3

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

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseRouting();

            app.UseAuthorization();

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

还要确保您的csproj是目标.net core 3.0

  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
  </PropertyGroup>

如何将dotnet core 2.2 webapi迁移到dotnet core 3.0

1 个答案: