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.NET Core 3.0 Preview Known Issues

This document lists known issues for .NET Core 3.0 Preview releases which may be encountered during usage.

ASP.NET Core

Preview 4

  • Server-side Blazor app fails to run on non-Windows platforms

    Running a server-side Blazor app on a non-Windows platform fails with the following error:

    System.InvalidOperationException: Could not load the embedded file manifest 'Microsoft.Extensions.FileProviders.Embedded.Manifest.xml' for assembly 'Microsoft.AspNetCore.Components.Server'.
    

    This will be addressed in the next preview update.

  • A request made to a CORS-enabled endpoint wihtout an origin header fails with an HTTP 500 error.

    Possible workarounds include:

    1. Having a middleware that sets the value in HttpContext.Items after UseCors()

      app.UseCors();
      
      app.Use((context, next) =>
      {
          context.Items["__CorsMiddlewareInvoked"] = true;
          return next();
      });
    2. Disable the check in EndpointRouting:

      services.AddRouting(r => r.SuppressCheckForUnhandledSecurityMetadata = true);

    The first option would be preferred since it's not removing a check for a mis-configured application.

  • Design-time errors in Visual Studio when using a component with child content from a component that lives in a different namespace

    This issue will be addressed in a future preview of Visual Studio. To workaround this issue, fully qualify the name of the child component

  • Design-time errors in Visual Studio for class libraries with Blazor components

    This issue will be addressed in a future preview of Visual Studio. To workaround this issue add the <AddRazorSupportForMvc>true</AddRazorSupportForMvc> property to your project file.

Preview 3

  • [RESOLVED] The Windows Hosting bundle doesn't exist for Preview3: The Windows Hosting bundle contained an issue which copied the 32 bit dlls into 64 bit locations. To work aroud this issue, please install the 3.0 Preview 2 Hosting Bundle and run the executable on a command line with the paramaters OPT_NO_SHAREDFX=1 OPT_NO_RUNTIME=1. Then install the appropriate .NET and ASP.NET runtimes for preview3.

  • [RESOLVED] Updates to .razor files fail to show up in subsequent builds: Updates to Razor Component (.razor) in Visual Studio may fail to show up in subsequent builds. To work around this issue add the following item group to the project file:

    <ItemGroup>
        <UpToDateCheckInput Include="@(Content->WithMetadataValue('Extension', '.razor'))" />
    </ItemGroup>
  • [RESOLVED] Updates to Razor Components in .razor files fail to show up in IntelliSense: Updates to Razor Components defined in .razor files may fail to show up in IntelliSense in Visual Studio. To workaround this issue rebuild the project.

  • [RESOLVED] Single Page Applications with authentication enabled throws method not found exception when visiting the register or login pages: The exception message is the one below. Method not found: 'Microsoft.EntityFrameworkCore.Metadata.Builders.IndexBuilder Microsoft.EntityFrameworkCore.Metadata.Builders.EntityTypeBuilder``1.HasIndex(System.Linq.Expressions.Expression``1<System.Func``2<!0,System.Object>>)'. To workaround this issue follow these steps:

    • Replace the following package references with the ones below in your csproj folder:

      <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0-preview3-19153-02" />
      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="3.0.0-preview3.19153.1" />
      <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0-preview3.19153.1" />
      <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0-preview-18579-0056" />
      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="3.0.0-preview.19080.1" />
      <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0-preview.19080.1" />
      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="3.0.0-preview.19080.1" />
      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.0.0-preview.19080.1" />
    • Add the following snippet to your csproj file:

      <PropertyGroup>
        <NoWarn>$(NoWarn);NU1605</NoWarn>
      </PropertyGroup>
  • Referencing 3.0.0 MVC libraries don't work as intended: There are several issues with referencing a 3.0.0 MVC library.

    • Razor pages will 404,
    • ApplicationParts and factories will not be discoverable
    • Controllers will not be discoverable

    To workaround this issue do the following:

    • Add the helper method:
    private void Add30AssemblyWorkaround(Assembly referencedAssembly, ApplicationPartManager applicationPartManager)
    {
        var partFactory = ApplicationPartFactory.GetApplicationPartFactory(referencedAssembly);
    
        foreach (var part in partFactory.GetApplicationParts(referencedAssembly))
        {
            applicationPartManager.ApplicationParts.Add(part);
        }
    
        var relatedAssemblies = RelatedAssemblyAttribute.GetRelatedAssemblies(referencedAssembly, throwOnError: true);
        foreach (var assembly in relatedAssemblies)
        {
            partFactory = ApplicationPartFactory.GetApplicationPartFactory(assembly);
            foreach (var part in partFactory.GetApplicationParts(assembly))
            {
                applicationPartManager.ApplicationParts.Add(part);
            }
        }
    }
    • Modify your services.AddMvc() call in Startup.cs:
    services.AddMvc()
        .ConfigureApplicationPartManager(manager =>
        {
            var referencedAssembly = Assembly.Load("RCL");
            Add30AssemblyWorkaround(referencedAssembly, manager);
        })
        ...
  • [RESOLVED] React template with authentication has a syntax error on build in file /ClientApp/src/components/api-authorization/ApiAuthorizationConstants.js When building or running the react template with authentication, after opening the browser, the app won't work and the following error message will be displayed.

    ×
    Error: Module build failed: SyntaxError: ClientApp/src/components/  api-authorization/ApiAuthorizationConstants.js: Unexpected token (27:25)
    
      25 |   DefaultLoginRedirectPath: '/',
      26 |   ApiAuthorizationClientConfigurationUrl: `/_configuration/$ {ApplicationName}`,
    > 27 |   ApiAuthorizationPrefix = prefix,
         |                          ^
      28 |   Login: `${prefix}/${LoginActions.Login}`,
      29 |   LoginFailed: `${prefix}/${LoginActions.LoginFailed}`,
      30 |   LoginCallback: `${prefix}/${LoginActions.LoginCallback}`,
    • Workaround: Replace ApiAuthorizationPrefix = prefix, with ApiAuthorizationPrefix: prefix,
  • [RESOLVED] Import error "Cannot find module "./components/api-authorization/Login": When building or running the react template with authentication, after opening the browser, the app won't work and the following error message will be displayed.

    ×
    Error: Cannot find module "./components/api-authorization/Login"
    ▼ 13 stack frames were expanded.
    ./src/components/api-authorization/ApiAuthorizationRoutes.js
    https://localhost:44315/static/js/bundle.js:53166:7
    __webpack_require__
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:678
    fn
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:88
    ./src/App.js
    https://localhost:44315/static/js/bundle.js:51925:111
    __webpack_require__
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:678
    fn
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:88
    ./src/index.js
    https://localhost:44315/static/js/bundle.js:54708:63
    __webpack_require__
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:678
    fn
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:88
    0
    https://localhost:44315/static/js/bundle.js:54860:18
    __webpack_require__
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:678
    (anonymous function)
    ClientApp/webpack/bootstrap 43633f0e2b726d97cc14:724
    (anonymous function)
    https://localhost:44315/static/js/bundle.js:728:10
    • Workaround:
      • Remove the file /ClientApp/src/components/api-authorizationApi/AuthorizationRoutes.js
      • Replace the contents of App.js with these
        import React, { Component } from 'react';
        import { Route } from 'react-router';
        import { Layout } from './components/Layout';
        import { Home } from './components/Home';
        import { FetchData } from './components/FetchData';
        import { Counter } from './components/Counter';
        import { Login } from './components/api-authorization/Login'
        import { Logout } from './components/api-authorization/Logout'
        import AuthorizeRoute from './components/api-authorization/AuthorizeRoute';
        import { ApplicationPaths, LoginActions, LogoutActions } from './components/api-authorization/ApiAuthorizationConstants';
        
        export default class App extends Component {
          static displayName = App.name;
        
          render () {
            return (
              <Layout>
                <Route exact path='/' component={Home} />
                <Route path='/counter' component={Counter} />
                <AuthorizeRoute path='/fetch-data' component={FetchData} />
                <Route path={ApplicationPaths.Login} render={() => loginAction(LoginActions.Login)} />
                <Route path={ApplicationPaths.LoginFailed} render={() => loginAction(LoginActions.LoginFailed)} />
                <Route path={ApplicationPaths.LoginCallback} render={() => loginAction(LoginActions.LoginCallback)} />
                <Route path={ApplicationPaths.Profile} render={() => loginAction(LoginActions.Profile)} />
                <Route path={ApplicationPaths.Register} render={() => loginAction(LoginActions.Register)} />
                <Route path={ApplicationPaths.LogOut} render={() => logoutAction(LogoutActions.Logout)} />
                <Route path={ApplicationPaths.LogOutCallback} render={() => logoutAction(LogoutActions.LogoutCallback)} />
                <Route path={ApplicationPaths.LoggedOut} render={() => logoutAction(LogoutActions.LoggedOut)} />
              </Layout>
            );
          }
        }
        
        function loginAction(name){
            return (<Login action={name}></Login>);
        }
        
        function logoutAction(name) {
            return (<Logout action={name}></Logout>);
        }
  • [RESOLVED] Runtime compilation using Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation throws an error stating "Cannot find reference assembly": When performing runtime Razor compilation, the application throws an error stating reference assemblies cannot be found. To workaround this, edit the project file and add this following property:

    <PropertyGroup>
      <PreserveCompilationReferences>true</PreserveCompilationReferences>
    </PropertyGroup>
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