Set EventCallback outside of a Blazor component?
Turns out you can assign an event callback from C# code like this: this.ProgressManager.UpdateNotification = new EventCallback(this, (Action)Refresh); void Refresh() {} It also works with async methods, e.g.: this.ProgressManager.UpdateNotification = new EventCallback(this, (Func<ValueTask>)RefreshAsync); ValueTask RefreshAsync() {} UPDATE You can also use EventCallbackFactory to more conveniently create event callback objects, e.g.: new EventCallbackFactory().Create(this, Refresh)