@page "/" <PageTitle>Index</PageTitle> <p role="status">Current count: @activeIndex</p> <p><button class="btn btn-primary" @onclick="ChangeIndex">Click me</button></p> <div> @frags[activeIndex] </div> @code { int activeIndex = 0; List<RenderFragment> frags = new List<RenderFragment>(); List<IComponent> comps = new List<IComponent>(); void ChangeIndex() { if (activeIndex < frags.Count() - 1) { activeIndex++; } else { activeIndex = 0; } } Random rnd = new Random(); (IComponent,RenderFragment) getRandom(int randomCount) { switch (rnd.Next(0, 3)) { case 0: { var b = new Test1(); b.ManualSet = randomCount; RenderFragment c = (@<Test1 @ref=b />); // "Ref b" is not using data from object b as as expected return (b, c); } case 1: { var b = new Test2(); b.ManualSet = randomCount; RenderFragment c = (@<Test2 @ref=b />); return (b, c); } case 2: { var b = new Test3(); b.ManualSet = randomCount; RenderFragment c = (@<Test3 @ref=b />); return (b, c); } } throw new Exception("no return"); } protected override async Task OnInitializedAsync() { for(int i = 0;i < 10; i++) { var random = getRandom(i); comps.Add(random.Item1); frags.Add(random.Item2); } } }