[dotnet-sdk-11.0.100-alpha.1.25619.109]Blog1 launch failed with error: InvalidOperationException: Object of type 'Microsoft.AspNetCore.Components.Routing.Router' does not have a property matching the name 'PreferExactMatches'.

[Junjun-zhao]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When running the third‑party app Blog1 and navigating to http://localhost:5000/ with the latest .NET 11 build, the page displays the following error: InvalidOperationException: Object of type 'Microsoft.AspNetCore.Components.Routing.Router' does not have a property matching the name 'PreferExactMatches'.

Application Name: Blog1
OS： Windows 11 24H2
CPU: X64
.NET Build Number: dotnet-sdk-11.0.100-alpha.1.25619.109
App & Source checking at: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2675428

Verify Scenarios:
1). Windows 11 24H2 AMD64 + dotnet-sdk-9.0.308: Pass
2). Windows 11 24H2 AMD64 + dotnet-sdk-10.0.101: Pass
3). Windows 11 24H2 AMD64 + dotnet-sdk-11.0.100-alpha.1.25616.107: Fail
4). Windows 11 24H2 AMD64 + dotnet-sdk-11.0.100-alpha.1.25619.109: Fail

Findings:
According to the official documentation
https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.components.routing.router.prefere…,
Router.PreferExactMatches is marked as Obsolete in the ASP.NET Core 10.0 API and earlier versions. Could you confirm whether this behavior is expected and whether this property has been officially removed starting with .NET 11.0?

Expected Behavior

The webpage can be accessed normally without errors.

Steps To Reproduce

1. Copy the app to your locally machine and change runtime in “LinkDotNet.Blog.Web.runtimeconfig” to ensure the app run with dotnet-sdk-11.0.100-alpha.1.25619.109.

"frameworks": [
      {
        "name": "Microsoft.NETCore.App",
        "version": "11.0.0-alpha.1.25619.109"
      },
      {
        "name": "Microsoft.AspNetCore.App",
        "version": "11.0.0-alpha.1.25619.109"
      }
    ]

2. Open cmd in “...\App\Blog1\Blog\”.
3. Execute command: set ASPNETCORE_ENVIRONMENT=Development.
4. Execute command: dotnet LinkDotNet.Blog.Web.dll.
5. Open edge and go to "http://localhost:5000/".

Exceptions (if any)

Page will show errors:

InvalidOperationException: Object of type 'Microsoft.AspNetCore.Components.Routing.Router' does not have a property matching the name 'PreferExactMatches'.
Microsoft.AspNetCore.Components.Reflection.ComponentProperties.ThrowForUnknownIncomingParameterName(Type targetType, string parameterName)
Microsoft.AspNetCore.Components.Reflection.ComponentProperties.SetProperties(ref ParameterView parameters, object target)
Microsoft.AspNetCore.Components.Routing.Router.SetParametersAsync(ParameterView parameters)
Microsoft.AspNetCore.Components.Rendering.ComponentState.SetDirectParameters(ParameterView parameters)
Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewComponentFrame(ref DiffContext diffContext, int frameIndex)
Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InitializeNewSubtree(ref DiffContext diffContext, int frameIndex)
Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InsertNewFrame(ref DiffContext diffContext, int newFrameIndex)
Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.InsertNewFrame(ref DiffContext diffContext, int newFrameIndex)
Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.AppendDiffEntriesForRange(ref DiffContext diffContext, int oldStartIndex, int oldEndIndexExcl, int newStartIndex, int newEndIndexExcl)
Microsoft.AspNetCore.Components.RenderTree.RenderTreeDiffBuilder.ComputeDiff(Renderer renderer, RenderBatchBuilder batchBuilder, int componentId, ArrayRange<RenderTreeFrame> oldTree, ArrayRange<RenderTreeFrame> newTree)
Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, out Exception renderFragmentException)
Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessRenderQueue()
Microsoft.AspNetCore.Components.RenderTree.Renderer.AddToRenderQueue(int componentId, RenderFragment renderFragment)
Microsoft.AspNetCore.Components.Endpoints.SSRRenderModeBoundary.SetParametersAsync(ParameterView parameters)
Microsoft.AspNetCore.Components.Rendering.ComponentState.SupplyCombinedParameters(ParameterView directAndCascadingParameters)
Microsoft.AspNetCore.Components.Rendering.ComponentState.SetDirectParameters(ParameterView parameters)
Microsoft.AspNetCore.Components.RenderTree.Renderer.RenderRootComponentAsync(int componentId, ParameterView initialParameters)
Microsoft.AspNetCore.Components.HtmlRendering.Infrastructure.StaticHtmlRenderer.BeginRenderingComponent(IComponent component, ParameterView initialParameters)
Microsoft.AspNetCore.Components.Endpoints.EndpointHtmlRenderer+<>c__DisplayClass53_0.<PrerenderComponentAsync>b__0()
Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContext.<InvokeAsync>g__Execute|9_0<TResult>(ValueTuple<AsyncTaskMethodBuilder<TResult>, Func<TResult>, RendererSynchronizationContext> state)
Microsoft.AspNetCore.Components.Endpoints.EndpointHtmlRenderer.PrerenderComponentAsync(HttpContext httpContext, Type componentType, IComponentRenderMode prerenderMode, ParameterView parameters, bool waitForQuiescence)
System.Runtime.CompilerServices.ValueTaskAwaiter<TResult>.GetResult()
Microsoft.AspNetCore.Mvc.TagHelpers.ComponentTagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output)
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.<RunAsync>g__Awaited|0_0(Task task, TagHelperExecutionContext executionContext, int i, int count)
LinkDotNet.Blog.Web.Pages.Pages__Host.ExecuteAsync() in _Host.cshtml
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, bool invokeViewStarts)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|30_0<TFilter, TFilterAsync>(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext<TFilter, TFilterAsync>(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.InvokeCore(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

.NET Version

11.0.100-alpha.1.25619.109

Anything else?

dotnet info:

.NET SDK:
 Version:           11.0.100-alpha.1.25619.109
 Commit:            5661a2c0a8
 Workload version:  11.0.100-manifests.9d52f85e
 MSBuild version:   18.3.0-preview-25619-109+5661a2c0a

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.26100
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\11.0.100-alpha.1.25619.109\

Host:
  Version:      11.0.0-alpha.1.25619.109
  Architecture: x64
  Commit:       5661a2c0a8

.NET SDKs installed:
  11.0.100-alpha.1.25619.109 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 11.0.0-alpha.1.25619.109 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 11.0.0-alpha.1.25619.109 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 11.0.0-alpha.1.25619.109 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

@dotnet-actwx-bot @dotnet/compat

[javiercn]

This is expected.

We recently removed the obsoleted APIs as part of 11.0 preview1

[Junjun-zhao]

@javiercn Thank you for the quick confirmation. Will this change be reflected in the documentation?

[javiercn]

I believe it already was when we obsoleted the property.

[Junjun-zhao]

@javiercn Got it. Thanks for the update.

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