dotnet watch is not picking up changes on .cshtml files using Razor Pages

[jeffpapp]

Describe the bug

I have dotnet watch running, and when I edit and save a .cshtml file it detects the file change but then reports no changes to apply.

dotnet watch ⌚ File changed: .\<Path to file>.cshtml.
dotnet watch ⌚ No hot reload changes to apply.

I have to kill dotnet watch and restart to pickup my changes.

I have a Microsoft_CodeAnalysis_EditAndContinue_LogDir set and I get a Blocked update status, but the only error I get is The using directive for 'XXX' appeared previously as global using.

Here is the full log with project information removed

EmitSolutionUpdate: '<null>'
Found 1 potentially changed document(s) in project '<Path to Project>.csproj'
Project summary for '<Path to Project>.csproj': ValidChanges
Document changed, added, or deleted: 'Microsoft.NET.Sdk.Razor.SourceGenerators\Microsoft.NET.Sdk.Razor.SourceGenerators.RazorSourceGenerator\Pages_<FileName>_cshtml.g.cs'
Emitting update of '<Path to Project>.csproj'
Solution update status: Blocked
Solution update diagnostics: dotnet/sdk#1 [<Path to Project>.csproj: 
<Path to file>.cs(8,7): hidden CS8933: The using directive for '<TYPE>' appeared previously as global using, ...]

Further technical details

• Include the output of dotnet --info

.NET SDK:
 Version:   7.0.201
 Commit:    68f2d7e7a3

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19044
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\7.0.201\

Host:
  Version:      7.0.3
  Architecture: x64
  Commit:       0a2bda10e8

.NET SDKs installed:
  6.0.301 [C:\Program Files\dotnet\sdk]
  6.0.305 [C:\Program Files\dotnet\sdk]
  6.0.309 [C:\Program Files\dotnet\sdk]
  7.0.100 [C:\Program Files\dotnet\sdk]
  7.0.103 [C:\Program Files\dotnet\sdk]
  7.0.200 [C:\Program Files\dotnet\sdk]
  7.0.201 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  C:\Projects\AOPlus\global.json

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

• The IDE (VS / VS Code/ VS4Mac) you're running on, and its version
  • Running VS 17.5

[jeffpapp]

Even after cleaning up all unnecessary using statements in my codebase I still get the same behavior with this in the log file which I have no control over

Solution update diagnostics: dotnet/sdk#1 [<Path>.csproj: <Path>\obj\Debug\net7.0\.NETCoreApp,Version=v7.0.AssemblyAttributes.cs(2,7): hidden CS8933: The using directive for 'System' appeared previously as global using, ...]

[jeffpapp]

I have narrowed down at least one issue to an ASP.NET Core Minimal API endpoint with a method parameter with a default value.

See the attached sample project.

Running dotnet watch and then changing some text on the Index.cshtml page will results in dotnet watch ⌚ No hot reload changes to apply.

Remove line 18 in Program.cs and run again and hot reload will start working.

Even keeping line 18 in Program.cs and removing the = false on the bool parameter in Endpoints.cs works.

Hopefully this is helpful to narrow down the issue

WebApplication6.zip

[tmat]

I think this is a combination of reloadable types and anonymous delegates.

Never mind, it's an issue with anonymous delegates #57295.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[tmat]

The compiler crashes (NRE) in

> Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Symbols.AnonymousTypeManager.AnonymousTypeOrDelegateTemplateSymbol.Name.get() Line 135    C# 

Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Emit.CSharpSymbolMatcher.MatchSymbols.TryFindAnonymousDelegateWithIndexedName(Microsoft.CodeAnalysis.CSharp.Symbols.AnonymousTypeManager.AnonymousDelegateTemplateSymbol type, out Microsoft.CodeAnalysis.Emit.AnonymousTypeValue otherType) Line 704    C#

Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Emit.CSharpSymbolMatcher.MatchSymbols.VisitNamedType(Microsoft.CodeAnalysis.CSharp.Symbols.NamedTypeSymbol sourceType) Line 555    C#

Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Symbols.NamedTypeSymbol.Accept<Microsoft.CodeAnalysis.CSharp.Symbol>(Microsoft.CodeAnalysis.CSharp.CSharpSymbolVisitor<Microsoft.CodeAnalysis.CSharp.Symbol> visitor) Line 742    C#

Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSymbolVisitor<Microsoft.CodeAnalysis.CSharp.Symbol>.Visit(Microsoft.CodeAnalysis.CSharp.Symbol symbol) Line 15    C#

See test SynthesizedDelegate_MethodGroup