Bug 1487866: [dotnet-sdk-7.0.100-preview.3.22118.7] blazorboilerplate "Todo list" page load with System.InvalidOperationException

Description

When running the app “blazorboilerplate” with .NET 7.0 Preivew 3 Runtime, failed to load the ToDo list page with an error message “an unhandled exception has occurred”

Reproduction Steps

Repro steps for App: This is .Net 5.0 app, but we are running it on 7.0, machine only have 7.0 installed, and DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX=2, so it runs on 7.0

**Getting the file and password from:**https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1487866

1. Restore database to local db from file
2. Launch cmd window.
3. Input “set ASPNETCORE_ENVIRONMENT=Development”, press “Enter”.
4. Navigate to blazorboilerplate folder.
5. Input “dotnet BlazorBoilerplate.Server.dll”, press “Enter”.
6. Open edge with “https://localhost:5001/” or “http://localhost:5000”.
7. Click “Login” button.
8. Input “user” into User Name textbox.
9. Input password into Password textbox.
10. Click “LOGIN” button.
11. Click “Todo List” item.

Minimal Repro Steps: The machine must have dotnet-sdk-7.0.100-preview.3.22122.1 SDK installed. Demo source code attached Demo (1).zip (Published folder contains the demo app, Demo folder contains the source code). 1.Create a .NET 5.0 ASP.NET Core project with default Blazor Server App project template. 2.Add a Counter.cs file for default Counter component in project with following code:

using Microsoft.AspNetCore.Components;
namespace Demo.Pages
{
    public partial class Counter : ComponentBase
    {
        public Counter()
        {

        }
        public Counter(string title)
        {
           
        }
    }
}

1. Publish the app and change the runtime.json file to use 7.0.0-preview.3.22117.6 for Microsoft.AspNetCore.App under publish folder.

{
  "runtimeOptions": {
    "tfm": "net5.0",
    "framework": {
      "name": "Microsoft.AspNetCore.App",
      "version": "7.0.0-preview.3.22117.6"
    },
    "configProperties": {
      "System.GC.Server": true,
      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
    }
  }
}

1. Launch the Demo.exe and access http://localhost:5000/
2. Click Counter menu.

Expected behavior

Expected Result for App: The “Todo List” page will display.

Expected Result for the minimal demo : The Counter page will display normally.

Actual behavior

Actual Result for App: Fail to load the ToDo List page with error “An handled exception has occurred.”

Actual Result for the minimal Demo:

The page will display a message about there is an exception and the page need to be reload. And the command prompt, we will see this error:

 Unhandled exception rendering component: Multiple constructors accepting all given argument types have been found in type 'Demo.Pages.Counter'. There should only be one applicable constructor.
      System.InvalidOperationException: Multiple constructors accepting all given argument types have been found in type 'Demo.Pages.Counter'. There should only be one applicable constructor.
         at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.TryFindMatchingConstructor(Type instanceType, Type[] argumentTypes, ConstructorInfo& matchingConstructor, Nullable`1[]& parameterMap)
         at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.FindApplicableConstructor(Type instanceType, Type[] argumentTypes, ConstructorInfo& matchingConstructor, Nullable`1[]& matchingParameterMap)
         at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.CreateFactory(Type instanceType, Type[] argumentTypes)
         at Microsoft.AspNetCore.Components.ComponentFactory.InstantiateDefault(IServiceProvider serviceProvider, Type componentType)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.InstantiateChildComponentOnFrame(RenderTreeFrame& frame, Int32 parentComponentId)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewComponentFrame(DiffContext& diffContext, Int32 frameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewSubtree(DiffContext& diffContext, Int32 frameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InsertNewFrame(DiffContext& diffContext, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, Int32 componentId, ArrayRange`1 oldTree, ArrayRange`1 newTree)
         at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()

Regression?

Yes

1). Windows 10 RS5 x64 + dotnet-sdk-7.0.100-preview.3.22122.1: Fail 2). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.3.22118.7: Fail 3). Windows10 RS5 x64+dotnet-sdk-5.0.211-win-x64: Pass 4). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.2.22114.1: Pass

Known Workarounds

No response

Configuration

Application Name: blazorboilerplate OS: Windows 10 RS5 CPU: X64 .NET Build Number: dotnet-sdk-7.0.100-preview.3.22118.7 Github Source Link: https://github.com/enkodellc/blazorboilerplate

App & AppSource Checking at: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1487866

Other information

Findings:

According to the error message, we tried remove the empty non-parameter constructor, to leave only one constructor. But we get another error:

System.MissingMethodException: No parameterless constructor defined for type 'Demo.Pages.Counter'.
         at System.RuntimeType.CreateInstanceDefaultCtorSlow(Boolean publicOnly, Boolean wrapExceptions, Boolean fillCache)
         at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, Boolean wrapExceptions)
         at System.Activator.CreateInstance(Type type, Boolean nonPublic, Boolean wrapExceptions)
         at System.Activator.CreateInstance(Type type)
         at Microsoft.AspNetCore.Components.DefaultComponentActivator.CreateInstance(Type componentType)
         at Microsoft.AspNetCore.Components.ComponentFactory.InstantiateComponent(IServiceProvider serviceProvider, Type componentType)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.InstantiateChildComponentOnFrame(RenderTreeFrame& frame, Int32 parentComponentId)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewComponentFrame(DiffContext& diffContext, Int32 frameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewSubtree(DiffContext& diffContext, Int32 frameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InsertNewFrame(DiffContext& diffContext, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForFramesWithSameSequence(DiffContext& diffContext, Int32 oldFrameIndex, Int32 newFrameIndex)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(DiffContext& diffContext, Int32 oldStartIndex, Int32 oldEndIndexExcl, Int32 newStartIndex, Int32 newEndIndexExcl)
         at Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, Int32 componentId, ArrayRange`1 oldTree, ArrayRange`1 newTree)
         at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderInExistingBatch(RenderQueueEntry renderQueueEntry)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()

@dotnet-actwx-bot @dotnet/compat

[pranavkm]

@Junjun-zhao thanks for the issue report. We’ve decided to document this as a breaking change for now to determine how widely it affects users to determine if we need to take further actions (such as rolling back the change or providing a switch). The announcement offers a couple of workarounds you could try to unblock yourself.

[pranavkm]

I hadn’t documented it as yet because I hadn’t thought this would be a breaking change. I’ll bring this up with the team to see if we should roll back the change, make it opt-in, or resolve this as a breaking change followed by an announcement.