在 .Net5 中复制 Asp.Net 的 Views 文件夹

Question

Many things changes from version to version in Asp.Net depending on .Net version. I have a project for .Net5 and I cannot get Views folder added in my build folder. I've tried to add next lines to my csproj file:

<PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <PreserveCompilationContext>true</PreserveCompilationContext>
    <RazorCompileOnBuild>false</RazorCompileOnBuild>
</PropertyGroup>

The result is that I still don't have Views foler at debug, release or publish folder. If I try to run in debug mode I get an error of missing views:

InvalidOperationException: The view 'Index' was not found. The following locations were searched:
    /Views/Home/Index.cshtml
    /Views/Shared/Index.cshtml

This is my ConfigureServices method:

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpContextAccessor();
    services.AddAuthentication(IdentityConstants.ApplicationScheme)
        .AddCookie(IdentityConstants.ApplicationScheme, o =>
        {
            o.Cookie.Path = "/";
        });

    services.AddControllersWithViews(o => o.Filters.Add(new AuthorizeFilter()));
}

Adding CopyRazorGenerateFilesToPublishDirectory to csproj changes nothing.

<CopyRazorGenerateFilesToPublishDirectory>true</CopyRazorGenerateFilesToPublishDirectory>

There are some solutions for this on stackoverflow, but all about older versions like .net framework and .net core 2 or 3. None of them has worked for me.

• Just to clarify. I can get it to work compiling all projects, but I need to edit my razor pages with no need to recompile my application. That's why I want my Views to get copied.

---

EDIT: Adding a reference to Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation package and setting Razor RuntimeCompilation at services configuration ...

services.AddControllersWithViews()
    .AddRazorRuntimeCompilation();

...you can edit your views while running your app from VS without recompiling (not checked). Then if I add CopyRazorGenerateFilesToPublishDirectory in my csproj I have editable views in my publish folder. The problem is that when I modify any view I get an exception: System.InvalidOperationException: Cannot find reference assembly 'Microsoft.AspNetCore.Antiforgery.dll' file for package Microsoft.AspNetCore.Antiforgery.Reference . No idea how to solve it.

Answer 1

Maybe try to inspect newly created empty project

dotnet new webapp --razor-runtime-compilation

it will create the following project

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <CopyRefAssembliesToPublishDirectory>false</CopyRefAssembliesToPublishDirectory>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="5.0.0" />
  </ItemGroup>

</Project>

Now check the Startup.cs file for ConfigureServices method:

  
public void ConfigureServices(IServiceCollection services)

     services.AddRazorPages();
  // services.AddMvc();  
  // services.AddRazorPages().AddRazorRuntimeCompilation();
}

Here we see services.AddRazorPages() extention method being called, so we could expect Razor Views functionality while calling services.AddControllersWithViews()

To summarize, adding nuget package reference Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation and calling services.AddControllersWithViews or services.AddMvc should add support for Razor views into the project.

Also configuring your views location is like calling:

 services.AddControllersWithViews()
         .AddRazorOptions(options =>
         {
                options.ViewLocationFormats.Add("/{0}.cshtml");
         });

Checking the sources: https://source.dot.net/#Microsoft.AspNetCore.Mvc/MvcServiceCollectionExtensions.cs,27 :

 public static IMvcBuilder AddMvc(this IServiceCollection services)
 {
     if (services == null)
     {
       throw new ArgumentNullException(nameof(services));
     }
 
            services.AddControllersWithViews();
            return services.AddRazorPages();
 } 

Answer 2

The problem is that when I modify any view I get an exception: System.InvalidOperationException: Cannot find reference assembly 'Microsoft.AspNetCore.Antiforgery.dll' file for package Microsoft.AspNetCore.Antiforgery.Reference. No idea how to solve it.

Having <CopyRefAssembliesToPublishDirectory>false</CopyRefAssembliesToPublishDirectory> the issue of missing assembly 'Microsoft.AspNetCore.Antiforgery.dll' reference was reproduced after running application from the published ( dotnet publish ) folder, and trying making changes the Views.

After reverting <CopyRefAssembliesToPublishDirectory>true</CopyRefAssembliesToPublishDirectory> the issue had gone.

Here is my .csproj that should work properly with dotnet publish

 
<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <RazorCompileOnBuild>false</RazorCompileOnBuild>
    <CopyRefAssembliesToPublishDirectory>true</CopyRefAssembliesToPublishDirectory>
    <CopyRazorGenerateFilesToPublishDirectory>true</CopyRazorGenerateFilesToPublishDirectory>       
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <PreserveCompilationContext>true</PreserveCompilationContext>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="5.0.5" />
  </ItemGroup>

  <ItemGroup>
   <KnownFrameworkReference Update="Microsoft.AspNetCore.App">
     <TargetingPackVersion>5.0.0</TargetingPackVersion>
   </KnownFrameworkReference>
 </ItemGroup>

</Project>