问更改选择时，调用MudBlazor MudSelect中的哪个事件，以及如何实现该事件？

EN

<MudSelect T="Stage" 
        ValueChanged="OnValueChanged" 
        Label="Stage" 
        Variant="Variant.Filled" 
        AnchorOrigin="Origin.BottomCenter">
    <MudSelectItem Value="@(new Stage("Stage 1"))" />
    <MudSelectItem Value="@(new Stage("Stage 2"))" />
    <MudSelectItem Value="@(new Stage("Stage 3"))" />
    <MudSelectItem Value="@(new Stage("Stage 4"))" />
    <MudSelectItem Value="@(new Stage("Stage 5"))" />
</MudSelect>

@if(selectedStage is not null)
{
    <br/>
    <MudAlert Severity="Severity.Info">@(selectedStage.StageName) was selected</MudAlert>
}

@code {
    private Stage selectedStage {get; set;}

    private void OnValueChanged(Stage selected)
    {
        selectedStage = selected;
        // Do other stuff
    }

    public class Stage
    {
        public Stage(string stageName)
        {
            StageName = stageName;
        }

        public readonly string StageName;

        public override bool Equals(object o)
        {
            var other = o as Stage;
            return other?.StageName == StageName;
        }

        public override int GetHashCode() => StageName?.GetHashCode() ?? 0;

        public override string ToString() => StageName;
    }
}