How can I properly dispose a component in Blazor?

Components should be disposed of properly to avoid memory leaks and allow proper garbage collection. Managed resources used by the application will be disposed of by the Blazor framework itself.

If a component implements IDisposable, the Dispose method will be called when the component is removed from the UI. You can use the Dispose method to release unmanaged resources, unhook events, dispose of DotNetObjectReference instances to avoid memory leaks.

Refer to the following code sample.

@implements IDisposable
@inject IJSRuntime jsRuntime
 
<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
 
@code { 
 
    DotNetObjectReference<HelloClass> dotNetObject { get; set; }
 
    protected override void OnInitialized()
    {
        dotNetObject = DotNetObjectReference.Create<HelloClass>(new HelloClass());
    }
 
    async Task IncrementCount()
    {
        await jsRuntime.InvokeVoidAsync("MyJavaScriptFunction", new object[] { dotNetObject });
    }
 
    void IDisposable.Dispose()
    {
        dotNetObject?.Dispose();
    }
}
 
@code{
 
    public class HelloClass
    {
        [JSInvokable]
        public void CustomMethod() { }
    }
}

I would suggest you check the below link for better understanding:

https://docs.microsoft.com/en-us/aspnet/core/blazor/components/lifecycle?view=aspnetcore-3.1#component-disposal-with-idisposable