.net core3.1 mvc视图运行时编译

有时为了方便调试，当修改cshtml文件时，不需要重新编译，操作方法如下

• 如果是新项目，在创建项目时“启用Razor运行时编译”打勾即可　　

　　

• 如果是现有项目

　　方法1（原理同上）：

　　1.项目右键->编辑项目文件：

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <CopyRefAssembliesToPublishDirectory>false</CopyRefAssembliesToPublishDirectory>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.3" />
  </ItemGroup>
</Project>

　　2.launchSettings.json

  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development",
        "ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation"
      }
    },
    "WebApplication4": {
      "commandName": "Project",
      "launchBrowser": true,
      "applicationUrl": "http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development",
        "ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation"
      }
    }
  }

  

 方法2：

1.编辑项目文件如下

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.3" Condition="'$(Configuration)' == 'Debug'" />
  </ItemGroup>
</Project>

2.修改startp.cs文件　　

    public class Startup
    { 
        public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration = configuration;
            Env = env;
        }
        public IWebHostEnvironment Env { get; set; }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            IMvcBuilder mvcBuilder = services.AddControllersWithViews();
#if DEBUG
            if (Env.IsDevelopment())
                mvcBuilder.AddRazorRuntimeCompilation(); 
#endif
        }

最后：以上无论哪种方法都加上这个条件后，会使用发布后的文件夹比较干净

<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="3.1.3" Condition="'$(Configuration)' == 'Debug'" />

未添加 Condition="'$(Configuration)' == 'Debug'"

添加 Condition="'$(Configuration)' == 'Debug'"后：