using System.Globalization; using System.Reflection; using System.Runtime.CompilerServices; namespace System.Reactive { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] internal static class ReflectionUtils { public static TDelegate CreateDelegate<[System.Runtime.CompilerServices.Nullable(2)] TDelegate>(object o, MethodInfo method) { return (TDelegate)(object)method.CreateDelegate(typeof(TDelegate), o); } public static Delegate CreateDelegate(Type delegateType, object o, MethodInfo method) { return method.CreateDelegate(delegateType, o); } public static void GetEventMethods<[System.Runtime.CompilerServices.Nullable(2)] TSender, [System.Runtime.CompilerServices.Nullable(2)] TEventArgs>(Type targetType, [System.Runtime.CompilerServices.Nullable(2)] object target, string eventName, out MethodInfo addMethod, out MethodInfo removeMethod, out Type delegateType, out bool isWinRT) { EventInfo event; if (target == null) { event = targetType.GetEvent(eventName, BindingFlags.Static | BindingFlags.Public); if (event == (EventInfo)null) throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.COULD_NOT_FIND_STATIC_EVENT, eventName, targetType.FullName)); } else { event = targetType.GetEvent(eventName, BindingFlags.Instance | BindingFlags.Public); if (event == (EventInfo)null) throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.COULD_NOT_FIND_INSTANCE_EVENT, eventName, targetType.FullName)); } MethodInfo addMethod2 = event.GetAddMethod(); if ((object)addMethod2 == null) throw new InvalidOperationException(Strings_Linq.EVENT_MISSING_ADD_METHOD); addMethod = addMethod2; MethodInfo removeMethod2 = event.GetRemoveMethod(); if ((object)removeMethod2 == null) throw new InvalidOperationException(Strings_Linq.EVENT_MISSING_REMOVE_METHOD); removeMethod = removeMethod2; ParameterInfo[] parameters = addMethod.GetParameters(); if (parameters.Length != 1) throw new InvalidOperationException(Strings_Linq.EVENT_ADD_METHOD_SHOULD_TAKE_ONE_PARAMETER); ParameterInfo[] parameters2 = removeMethod.GetParameters(); if (parameters2.Length != 1) throw new InvalidOperationException(Strings_Linq.EVENT_REMOVE_METHOD_SHOULD_TAKE_ONE_PARAMETER); isWinRT = false; if (IsWinRTEventRegistrationTokenType(addMethod.ReturnType)) { isWinRT = true; if (IsWinRTEventRegistrationTokenType(parameters2[0].ParameterType)) throw new InvalidOperationException(Strings_Linq.EVENT_WINRT_REMOVE_METHOD_SHOULD_TAKE_ERT); } delegateType = parameters[0].ParameterType; MethodInfo method = delegateType.GetMethod("Invoke"); ParameterInfo[] parameters3 = method.GetParameters(); if (parameters3.Length != 2) throw new InvalidOperationException(Strings_Linq.EVENT_PATTERN_REQUIRES_TWO_PARAMETERS); if (!typeof(TSender).IsAssignableFrom(parameters3[0].ParameterType)) throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.EVENT_SENDER_NOT_ASSIGNABLE, typeof(TSender).FullName)); if (!typeof(TEventArgs).IsAssignableFrom(parameters3[1].ParameterType)) throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.EVENT_ARGS_NOT_ASSIGNABLE, typeof(TEventArgs).FullName)); if (method.ReturnType != typeof(void)) throw new InvalidOperationException(Strings_Linq.EVENT_MUST_RETURN_VOID); } private static bool IsWinRTEventRegistrationTokenType(Type t) { if (t.Name == "EventRegistrationToken") { if (!(t.Namespace == "System.Runtime.InteropServices.WindowsRuntime")) return t.Namespace == "WinRT"; return true; } return false; } } }