.NET 8 blazor .wasm Lazy Loaded Assemblies throws runtime exception and fails to load #95381
Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
I have my production blazor wasm app running on .NET 7 with lazy loading enabled. Now I'm updating my blazor wasm app to .NET 8 following the docs. And when I run, I'm surprised to see a run time exception and the assemblies are not loaded.
Steps I did:
- Updated all the
<BlazorWebAssemblyLazyLoad Include="{ASSEMBLY}.dll" />inWeb.csprojto<BlazorWebAssemblyLazyLoad Include="{ASSEMBLY}.wasm" /> - Updated all the
await AssemblyLoader.LoadAssembliesAsync(new[] { "{ASSEMBLY}.dll" });inApp.razortoawait AssemblyLoader.LoadAssembliesAsync(new[] { "{ASSEMBLY}.wasm" });
Expected Behavior
The app should lazy load the assemblies and run them like before in .NET 7. Here is the working main branch of ilovedotnet repo.
Steps To Reproduce
- Clone main branch of ilovedotnet repo.
- Go to commit a6a5dca35abe1b9182f6c497a34d03a5635760bc.
- Update to .NET 8.
- Run using
VisualStudio 2022 17.8.1ordotnet run command. - Access from browser.
Clear Site DataunderApplicationTab in browser.- Reload the home page and navigate to any article
Exceptions (if any)
Runtime Error:
Unhandled exception rendering component: Could not load file or assembly 'Components, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies.
System.IO.FileNotFoundException: Could not load file or assembly 'Components, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies.
IO_FileName_Name, Components, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
at Microsoft.AspNetCore.Components.ComponentBase.<.ctor>b__6_0(RenderTreeBuilder builder)
at Microsoft.AspNetCore.Components.Rendering.ComponentState.RenderIntoBatch(RenderBatchBuilder , RenderFragment , Exception& )
Error Screen shot:
.NET Version
8.0.100
Anything else?
dotnet --info:
.NET SDK:
Version: 8.0.100
Commit: 57efcf1350
Workload version: 8.0.100-manifests.8d38d0cc
Runtime Environment:
OS Name: Windows
OS Version: 10.0.22000
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\8.0.100\
.NET workloads installed:
Workload version: 8.0.100-manifests.8d38d0cc
[wasm-tools-net7]
Installation Source: SDK 8.0.100
Manifest Version: 8.0.0/8.0.100
Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.workload.mono.toolchain.net7\8.0.0\WorkloadManifest.json
Install Type: Msi
[ios]
Installation Source: VS 17.8.34316.72
Manifest Version: 17.0.8478/8.0.100
Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.ios\17.0.8478\WorkloadManifest.json
Install Type: Msi
[android]
Installation Source: VS 17.8.34316.72
Manifest Version: 34.0.43/8.0.100
Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.android\34.0.43\WorkloadManifest.json
Install Type: Msi
[maui-windows]
Installation Source: VS 17.8.34316.72
Manifest Version: 8.0.3/8.0.100
Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.maui\8.0.3\WorkloadManifest.json
Install Type: Msi
[wasm-tools]
Installation Source: VS 17.8.34316.72
Manifest Version: 8.0.0/8.0.100
Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.workload.mono.toolchain.current\8.0.0\WorkloadManifest.json
Install Type: Msi
[maccatalyst]
Installation Source: VS 17.8.34316.72
Manifest Version: 17.0.8478/8.0.100
Manifest Path: C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.maccatalyst\17.0.8478\WorkloadManifest.json
Install Type: Msi
Host:
Version: 8.0.0
Architecture: x64
Commit: 5535e31a71
.NET SDKs installed:
8.0.100 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.25 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.0 [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:
Not found
Learn more:
https://aka.ms/dotnet/info
Download .NET:
https://aka.ms/dotnet/download
Visual Studio:
Microsoft Visual Studio Enterprise 2022 (64-bit) - Current
Version 17.8.1
Windows:
Edition Windows 11 Pro
Version 21H2
Installed on 10-11-2021
OS build 22000.2538
Experience Windows Feature Experience Pack 1000.22001.1000.0