WARNING MVVMTK0045

Question

Both with net8.0 and net9.0, at times I have a warning MVVMTK0045.

Following the instructions in the relevant documentation https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/generators/errors/mvvmtk0045 does not clear the issue - on the contrary, VS reports errors MVVMTK0052 and MVVMTK0043.

The funny thing is that not all the properties in my code generate this warning.

I am puzzled.

Answer 1

I can reproduce this issue. You can remove this warning by the following two ways:

1. Use the CommunityToolKit.Mvvm version 8.3.2 instead of the CommunityToolKit.Mvvm version 8.4.0. This can make the warning disappeared directly.
2. According to the official documment about MVVM Toolkit warning MVVMTK0045 and MVVM Toolkit error MVVMTK0041.

You can add the following code into the csproj file:

<PropertyGroup>
      <LangVersion>preview</LangVersion>
</PropertyGroup>

And then change your properties like following code to:

public partial class BaseViewModel : ObservableObject
 {
     [ObservableProperty]
     public partial bool Isbusy { get; set; }
     [ObservableProperty]
     public partial string? Title { get; set; }
 }