You may encounter the following known issues, which may include workarounds, mitigations, or expected resolution timeframes.
It isn't possible to evaluate expressions in a Blazor WebAssembly app using .NET 7 RC1 dotnet/runtime#75495
Copy the following into the server project (.csproj
) of a .NET 7 Preview RC1
Blazor WebAssembly Hosted App:
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis.Scripting.Common" Version="3.7.0" ExcludeAssets="all" GeneratePathProperty="true"/>
<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="3.7.0" ExcludeAssets="all" GeneratePathProperty="true"/>
</ItemGroup>
<Target Name="_CopyCodeAnalysisDeps" AfterTargets="Build">
<Copy SourceFiles="$(PkgMicrosoft_CodeAnalysis_Scripting_Common)\lib\netstandard2.0\Microsoft.CodeAnalysis.Scripting.dll"
DestinationFolder="$(OutputPath)\BlazorDebugProxy"
SkipUnchangedFiles="true"/>
<Copy SourceFiles="$(PkgMicrosoft_CodeAnalysis_CSharp_Scripting)\lib\netstandard2.0\Microsoft.CodeAnalysis.CSharp.Scripting.dll"
DestinationFolder="$(OutputPath)\BlazorDebugProxy"
SkipUnchangedFiles="true"/>
</Target>
Copy the following into a .NET 7 Preview RC1
Blazor WebAssembly project (.csproj
):
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis.Scripting.Common" Version="3.7.0" ExcludeAssets="all" GeneratePathProperty="true"/>
<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="3.7.0" ExcludeAssets="all" GeneratePathProperty="true"/>
</ItemGroup>
<Target Name="_CopyCodeAnalysisDeps" AfterTargets="Build">
<Copy SourceFiles="$(PkgMicrosoft_CodeAnalysis_Scripting_Common)\lib\netstandard2.0\Microsoft.CodeAnalysis.Scripting.dll"
DestinationFolder="$(PkgMicrosoft_AspNetCore_Components_WebAssembly_DevServer)\tools\BlazorDebugProxy"
SkipUnchangedFiles="true"/>
<Copy SourceFiles="$(PkgMicrosoft_CodeAnalysis_CSharp_Scripting)\lib\netstandard2.0\Microsoft.CodeAnalysis.CSharp.Scripting.dll"
DestinationFolder="$(PkgMicrosoft_AspNetCore_Components_WebAssembly_DevServer)\tools\BlazorDebugProxy"
SkipUnchangedFiles="true"/>
</Target>
That will copy the missing dependency into the DevServer package and enable evaluation of expression on Wasm debugging in .NET 7.0 Preview RC1 after a single build. This workaround only needs to be run once per package root to repair the DevServer package but should be harmless to leave in.
It isn't possible to debug a Blazor WebAssembly app using .NET 7 Preview 5 dotnet/runtime#70383
Copy the following into the server project (.csproj
) of a .NET 7 Preview 5
Blazor WebAssembly Hosted App:
<ItemGroup>
<PackageReference Include="Serilog.Extensions.Logging.File" Version="2.0.0" ExcludeAssets="all" GeneratePathProperty="true"/>
</ItemGroup>
<Target Name="_CopySerilogDeps" AfterTargets="Build">
<Copy SourceFiles="$(PkgSerilog_Extensions_Logging_File)\lib\netstandard2.0\Serilog.Extensions.Logging.File.dll"
DestinationFolder="$(OutputPath)\BlazorDebugProxy"
SkipUnchangedFiles="true"/>
</Target>
Copy the following into a .NET 7 Preview 5
Blazor WebAssembly project (.csproj
):
<ItemGroup>
<PackageReference Include="Serilog.Extensions.Logging.File" Version="2.0.0" ExcludeAssets="all" GeneratePathProperty="true"/>
</ItemGroup>
<Target Name="_CopySerilogDeps" AfterTargets="Build">
<Copy SourceFiles="$(PkgSerilog_Extensions_Logging_File)\lib\netstandard2.0\Serilog.Extensions.Logging.File.dll"
DestinationFolder="$(PkgMicrosoft_AspNetCore_Components_WebAssembly_DevServer)\tools\BlazorDebugProxy"
SkipUnchangedFiles="true"/>
</Target>
That will copy the missing dependency into the DevServer package and enable Wasm debugging in .NET 7.0 Preview 5 after a single build. This workaround only needs to be run once per package root to repair the DevServer package but should be harmless to leave in as long as the project doesn’t have a different Serilog version requirement.
Assembly.GetType("System.Net.Http.HttpClientHandler", false, true) does not find some types but finds it when ignoreCase is set to false
When trying to do GetType with ignorecase as true in some cases does not find the type but finds it when ignoreCase is set to false. This only happens in .NET 7 preview 1 and doesn't happen in .NET 6. More information and workaround can be found at dotnet/runtime#65013.
.NET 7 Preview 3 on Linux skips revocation checks for expired certificates, reporting RevocationStatusUnknown when revocation checks were enabled. You can read more about this here: dotnet/runtime#66803
.NET 7 Preview 5 on Browser WASM has implemented the SHA1, SHA256, SHA384, SHA512 algorithms using the SubtleCrypto browser-native APIs. A race condition was discovered in System.Security.Cryptography's implementation where the wrong hash value is returned unpredictably. You can read more about this here: dotnet/runtime#69806. This only happens in .NET 7 Preview 5 and has been fixed in the latest code.
[7.0] Projects using certain workloads don't load, build, and or run if .NET 7 Preview SDK workloads are installed
If a preview .NET 7 SDK is installed, projects with workload dependencies such as microsoft.net.workload.mono.toolchain
may fail to build, load, and or run. An example of this issue is described here.
Resolution
The best method to resolve the issue is to uninstall any .NET 7 preview SDKs. For detailed instructions, see dotnet uninstall instructions. For example, on Windows, dotnet preview SDKs can be uninstalled with add/remove programs. Another option is to try deleting the folder C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain
, but this will only work for file-based installs. Dotnet-core-uninstall is another option for uninstalling the .NET 7 preview SDKs.
The --interactive flag is not working with any dotnet.exe command in RC1. dotnet/sdk#27597
Workarounds
- set
DOTNET_CLI_DO_NOT_USE_MSBUILD_SERVER=1
before runningdotnet
msbuild /t:restore /p:nugetInteractive=true
- package source credentials
- Open the project in Visual Studio
The dotnet user-jwts
command line tool is not functional in .NET 7 RC1 due to an assembly resolution bug. When running the CLI, you will encounter the following exception.
$ dotnet user-jwts create
Could not load file or assembly 'Microsoft.Extensions.Configuration.Binder, Version=7.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.
To circumvent this issue, you will need to modify the local installation to probe correctly for the Microsoft.Extensions.Configuration.Binder
assembly
- Locate the
user-jwts
tool directory in your local SDK installation. This will typically be located in a path as follows:
-
on Linux/macOS:
~/.dotnet/sdk/7.0.100-rc.1.22431.12/DotnetTools/dotnet-user-jwts/7.0.0-rc.1.22427.2/tools/net7.0/any
-
on Windows:
C:\Program Files\ddotnet\sdk\7.0.100-rc.1.22431.12\DotnetTools\dotnet-user-jwts\7.0.0-rc.1.22427.2\tools\net7.0\any
- Locate the
dotnet-user-jwts.deps.json
file and make the following modifications:
{
"targets": {
".NETCoreApp,Version=v7.0": {
"dotnet-user-jwts/7.0.0-rc.1.22426.10": {
"dependencies": {
+ "Microsoft.Extensions.Configuration.Binder": "7.0.0-rc.1.22426.10"
},
+ "Microsoft.Extensions.Configuration.Binder/7.0.0-rc.1.22426.10": {
+ "dependencies": {
+ "Microsoft.Extensions.Configuration.Abstractions": "7.0.0-rc.1.22426.10"
+ },
+ "runtime": {
+ "lib/net7.0/Microsoft.Extensions.Configuration.Binder.dll": {
+ "assemblyVersion": "7.0.0.0",
+ "fileVersion": "7.0.22.42610"
+ }
+ }
},
},
"libraries": {
+ "Microsoft.Extensions.Configuration.Binder/7.0.0-rc.1.22426.10": {
+ "type": "package",
+ "serviceable": true,
+ "sha512": "",
+ "path": "microsoft.extensions.configuration.binder/7.0.0-rc.1.22426.10",
+ "hashPath": "microsoft.extensions.configuration.binder.7.0.0-rc.1.22426.10.nupkg.sha512"
+ },
}
}
- Locate the
Microsoft.Extensions.Configuration.Binder
assembly in the directory associated with theMicrosoft.AspNetCore.App
shared runtime. This will typically be located in a path as follows:
-
on Linux/macOS
~/.dotnet/shared/Microsoft.AspNetCore.App/7.0.0-rc.1.22427.2
-
on Windows
C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App\7.0.0-rc.1.22427.2
- Copy the assembly from Step 3 to the
user-jwts
tool directory from Step 1.
-
on Linux/macOS
cp ~/.dotnet/shared/Microsoft.AspNetCore.App/7.0.0-rc.1.22427.2/Microsoft.Extensions.Configuration.Binder.dll ~/.dotnet/sdk/7.0.100-rc.1.22431.12/DotnetTools/dotnet-user-jwts/7.0.0-rc.1.22427.2/tools/net7.0/any
-
on Windows
copy C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App\7.0.0-rc.1.22427.2\C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App\7.0.0-rc.1.22427.2 C:\Program Files\ddotnet\sdk\7.0.100-rc.1.22431.12\DotnetTools\dotnet-user-jwts\7.0.0-rc.1.22427.2\tools\net7.0\any
- Note that the install directory for the SDK may not be deleted during uninstall due to applying this workaround, e.g. when updating to 7.0.0-rc.2. If that occurs, delete the directory manually.
This issue will be resolved in .NET 7 RC 2.
.NET MSBuild is adding a new live console logger in a future release. The initial implementation that shipped in 17.5 previews (and will ship in .NET SDK 7.0.200) had the classes public. This new logger is still in preview and not meant for public consumption of the classes or apis. 17.5.0 will ship with the classes marked internal and that change will release in the .NET SDK 7.0.201 release in March.
The logger will also be renamed for 17.6. dotnet/msbuild#8343
A breaking change was introduced that was intended to prevent common build errors. However, many users relied on this behavior to build their projects. We have downgraded this change to a warning and are intent on releasing this fix in 7.0.201. Please see the linked breaking change notification for more details.
In .NET 7 Preview 7, we've introduced a new feature for binding values to components using the new bind:get
, bind:set
and bind:after
syntax.
As part of a follow-up work to address some issues we've learned about related to that feature, we had to take a two-part fix both in dotnet/aspnetcore and dotnet/razor-compiler repos. Unfortunately, we had an issue with our dependency update process and the razor compiler changes did not make it into the 7.0 build. As a result, when you try to use bind, get, set, after on 7.0 Blazor application, the compiler will emit code against non existing APIs and users will be presented with an error like Can't convert from EventCallback<T> to Func<T,Task>
.
An update for the compiler is planned as part of the 7.0.1 release that will update the compiler to target the new APIs and make this feature work as expected from them on.
Users that are not relying on bind get, set, after will not be affected by this issue.