ReflectionUtils
using System.Globalization;
using System.Reflection;
using System.Runtime.InteropServices.WindowsRuntime;
namespace System.Reactive
{
internal static class ReflectionUtils
{
public static TDelegate CreateDelegate<TDelegate>(object o, MethodInfo method)
{
return (TDelegate)(object)Delegate.CreateDelegate(typeof(TDelegate), o, method);
}
public static Delegate CreateDelegate(Type delegateType, object o, MethodInfo method)
{
return Delegate.CreateDelegate(delegateType, o, method);
}
public static void GetEventMethods<TSender, TEventArgs>(Type targetType, object target, string eventName, out MethodInfo addMethod, out MethodInfo removeMethod, out Type delegateType, out bool isWinRT)
{
EventInfo eventInfo = null;
if (target == null) {
eventInfo = targetType.GetEventEx(eventName, true);
if (eventInfo == (EventInfo)null)
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.COULD_NOT_FIND_STATIC_EVENT, eventName, targetType.FullName));
} else {
eventInfo = targetType.GetEventEx(eventName, false);
if (eventInfo == (EventInfo)null)
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Strings_Linq.COULD_NOT_FIND_INSTANCE_EVENT, eventName, targetType.FullName));
}
addMethod = eventInfo.GetAddMethod();
removeMethod = eventInfo.GetRemoveMethod();
if (addMethod == (MethodInfo)null)
throw new InvalidOperationException(Strings_Linq.EVENT_MISSING_ADD_METHOD);
if (removeMethod == (MethodInfo)null)
throw new InvalidOperationException(Strings_Linq.EVENT_MISSING_REMOVE_METHOD);
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 (addMethod.ReturnType == typeof(EventRegistrationToken)) {
isWinRT = true;
if (parameters2[0].ParameterType != typeof(EventRegistrationToken))
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);
}
public static EventInfo GetEventEx(this Type type, string name, bool isStatic)
{
return type.GetEvent(name, isStatic ? (BindingFlags.Static | BindingFlags.Public) : (BindingFlags.Instance | BindingFlags.Public));
}
}
}