Cannot use build function inside BuildRenderTree Blazor WASM

Question

I want to build Blazor components dynamically but i am having a weird error on WASM while the same code in Server-Side works.

I am sorry but i do not know how to explain the error or bug in details but basically if i build the Component on the overriden RenderBuildTree it works correctly, but if i call another BuildFunction inside the RenderBuildTree i get a System.InvalidOperationException: The render handle is not yet assigned. error.

To reproduce the error, try typing something into the TextField and clicking out of it to trigger the ValueChanged.

Minimal reproducible code: https://try.mudblazor.com/snippet/ckQmYGOeIEycwaoV

Answer 1

You call it on the wrong instance.
The core problem is TestBaseComponent TestBaseComponent = new();

public class TestComponentBuilder : ComponentBase
{
    // private static readonly TestBaseComponent TestBaseComponent = new();
    protected override void BuildRenderTree(RenderTreeBuilder builder)
    {
        // TestBaseComponent.Build(builder);
        builder.OpenComponent(1, typeof(TestBaseComponent));
        builder.CloseComponent();
    }
}