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JsonSerializer throws exception in Blazor Web App .NET 8, when AOT is enabled

I am getting this exception in my Blazor Web App, whenever i try to use JsonSerializer while AOT is enabled. I get the exception when running in debug mode, which i find strange

System.InvalidOperationException: 'Reflection-based serialization has been disabled for this application. Either use the source generator APIs or explicitly configure the 'JsonSerializerOptions.TypeInfoResolver' property.'

Steps to reproduce my problem:

Create a Blazor Web App (WebAssembly) with .NET 8. Got to project properties and enable AOT

enter image description here

Goto Home.razor and add this code, so we trigger the use of System.Text.Json.JsonSerializer

@code{
    protected override void OnInitialized()
    {
        var test = System.Text.Json.JsonSerializer.Serialize("Hello World");
    }
}

Now run the project in debug mode. When it tries to serialize, i get this exception

Solution

  • I managed to solve the issue. When I used the Blazor Web App Wasm template, it created two projects for me. A normal project, and a .Client project. Do not enable AOT for the normal project. Enable AOT for the .Client project

    enter image description here

    Go to project properties for the .Client project, and enable AOT

    enter image description here

    When I publish my project now, everything works. My published code is 2.5x faster, than a non-AOT publish.

    Like H H said, according to Microsoft documentation, native AOT is not supported for Blazor. Maybe there is a difference between "AOT" and "native AOT"?