private static IDisposable WinRTEventBind <THandler>(object sender, EventInfo ei, object handler)
{
System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken tk = default(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken);
Action <System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken> remove
= et =>
{
ei.RemoveMethod.Invoke(sender, new object[] { et });
};
System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeMarshal.AddEventHandler <THandler>(
ev =>
{
tk = (System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken)ei.AddMethod.Invoke(sender, new object[] { ev });
return(tk);
},
remove,
(THandler)handler);
return(new Disposable(() =>
{
System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeMarshal.RemoveEventHandler <THandler>(
remove,
(THandler)handler);
}
));
}
/// <summary>
/// A helper method that exposed in our System.Private.MCG
/// contract assembly to access the internal ExtractHandler method
/// There are other options such as
/// 1) define another EventRegistrationTokenTable.Extracthandler in
/// System.Private.MCG assembly. Unfortunately this doesn't work because
/// compiler sees two EventRegistrationTokenTable classes in two contracts
/// 2) make a Extracthandler an extention method. This requires having a "using" statement for the
/// extension methods and doesn't make things easier to understand
/// </summary>
public static T ExtractHandler <T>(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationTokenTable <T> table, System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken token) where T : class
{
return(table.ExtractHandler(token));
}
/// <summary>
/// Creates a <see cref="EventRegistrationToken"/> from <see cref="System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken"/>.
/// </summary>
/// <param name="args">The <see cref="System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken"/> instance containing the event data.</param>
/// <returns><see cref="EventRegistrationToken"/></returns>
public static EventRegistrationToken FromEventRegistrationToken(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken args)
{
return(new EventRegistrationToken(args));
}
public void RemoveEventHandler(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken token)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="EventRegistrationToken"/> class, a
/// Wpf-enabled wrapper for <see cref="System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken"/>
/// </summary>
public EventRegistrationToken(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken instance)
{
this.UwpInstance = instance;
}
