C# - Rx framework to create Observable from EventHandler

less than 1 minute read

The following code shows how to create IObserable object from EventHandler delegator.

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public CustomEventArg : EventArg
{
    public int Value { get; set; }
}
public class CustomOtherClass
{
    public event EventHandler<CustomEventArg> OnCustEvent;
}
public class Test
{
    private IObservable<CustomEventArg> m_obEvent;
    private CustomOtherClass m_other = new CustomOtherClass();
    public IObservable<CustomEventArg> ObserverCustomEvent { get { return m_obEvent; } }
    Test()
    {
        m_obEvent = Obserable.FromEvent<EventHandler<CustomEventArg>, CustomEventArg>(h =>
            {
                EventHandler<CustomEventArg> handler = (sender, e) =>
                {
                     h(e);
                }
                return handler;
            },
            f => m_other.OnCustomEvent += f,
            f => m_other.OnCustomEvent -= f);
    }
}

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