MissingMethodException occured when deploying Blazor Server app with 'Trim Unused code'

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I created an Blazor Server application using the default template on .NET 6, and deploy it with the option ‘Trim Unused code’ as self-contained. Then, I ran the application, and launched the page in browser, and the ‘System.MissingMethodException: Cannot dynamically create an instance of type ‘Microsoft.AspNetCore.Components.Web.HeadOutlet’. Reason: No parameterless constructor defined.’ occurred. When I checked HeadOutlet class of the generated Microsoft.AspNetCore.Components.Web.dll, I found that the HeadOutlet class is a empty class.

If I deployed the application without the option ‘Trim Unused code’, the generated Microsoft.AspNetCore.Components.Web.dll is normal, and no exceptions occurred.

Source code: https://1drv.ms/u/s!AsFi0-jzsGnQawMBCLgbBt2PYGg?e=BviG3k

Expected Behavior

No response

Steps To Reproduce

1. Create a Blazor Server application.
2. Deploy the application with the option ‘Trim Unused code’ as self-contained.
3. Run the deployed binaries.

Exceptions (if any)

fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1] An unhandled exception has occurred while executing the request. System.MissingMethodException: Cannot dynamically create an instance of type ‘Microsoft.AspNetCore.Components.Web.HeadOutlet’. Reason: No parameterless constructor defined. at System.RuntimeType.ActivatorCache…ctor(RuntimeType ) at System.RuntimeType.CreateInstanceDefaultCtor(Boolean , Boolean ) at System.Activator.CreateInstance(Type type, Boolean nonPublic, Boolean wrapExceptions) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at Microsoft.AspNetCore.Components.DefaultComponentActivator.CreateInstance(Type ) at Microsoft.AspNetCore.Components.ComponentFactory.InstantiateComponent(IServiceProvider , Type ) at Microsoft.AspNetCore.Components.RenderTree.Renderer.InstantiateComponent(Type ) at Microsoft.AspNetCore.Components.Rendering.HtmlRenderer.CreateInitialRenderAsync(Type componentType, ParameterView initialParameters) at Microsoft.AspNetCore.Components.Rendering.HtmlRenderer.RenderComponentAsync(Type componentType, ParameterView initialParameters) at Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContext.<>c__111.<<InvokeAsync>b__11_0>d.MoveNext() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Mvc.ViewFeatures.StaticComponentRenderer.PrerenderComponentAsync(ParameterView parameters, HttpContext httpContext, Type componentType) at Microsoft.AspNetCore.Mvc.ViewFeatures.ComponentRenderer.PrerenderedServerComponentAsync(HttpContext context, ServerComponentInvocationSequence invocationId, Type type, ParameterView parametersCollection) at Microsoft.AspNetCore.Mvc.ViewFeatures.ComponentRenderer.RenderComponentAsync(ViewContext viewContext, Type componentType, RenderMode renderMode, Object parameters) at Microsoft.AspNetCore.Mvc.TagHelpers.ComponentTagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output) at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.<RunAsync>g__Awaited|0_0(Task task, TagHelperExecutionContext executionContext, Int32 i, Int32 count) at BlazorApp1.Pages.Pages__Layout.<ExecuteAsync>b__14_0() in C:\Users\cowne\source\repos\BlazorApp1\BlazorApp1\Pages\_Layout.cshtml:line 14 at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.SetOutputContentAsync() at BlazorApp1.Pages.Pages__Layout.ExecuteAsync() at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderLayoutAsync(ViewContext context, ViewBufferTextWriter bodyWriter) at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context) at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable1 statusCode) at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable`1 statusCode) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters() — End of stack trace from previous location — at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync() — End of stack trace from previous location — at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)

.NET Version

6.0.101

Anything else?

Microsoft Visual Studio Professional 2022 (64-bit) Version 17.0.5

.NET SDK: Version: 6.0.101 Commit: ef49f6213a

OS Name: Windows OS Version: 10.0.19044 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\6.0.101\

Host (useful for support): Version: 6.0.1 Commit: 3a25a7f1cc

.NET SDKs installed: 5.0.402 [C:\Program Files\dotnet\sdk] 6.0.101 [C:\Program Files\dotnet\sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.0-rc.2.21480.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.0-rc.2.21501.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[chrdlx]

This still happens in .NET 7 Preview 7.

[yangzhongke]

HeadOutlet

Thanks for your reply. However, it still doesn’t work. .NET SDK version: 6.0.4 VS version: 17.1.4