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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
#if FEATURE_COMINTEROP
using EventRegistrationToken = System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken;
#endif //#if FEATURE_COMINTEROP
namespace System.Reflection
{
public abstract class EventInfo : MemberInfo
{
protected EventInfo() { }
public override MemberTypes MemberType => MemberTypes.Event;
public abstract EventAttributes Attributes { get; }
public bool IsSpecialName => (Attributes & EventAttributes.SpecialName) != 0;
public MethodInfo[] GetOtherMethods() => GetOtherMethods(nonPublic: false);
public virtual MethodInfo[] GetOtherMethods(bool nonPublic) { throw NotImplemented.ByDesign; }
public virtual MethodInfo AddMethod => GetAddMethod(nonPublic: true);
public virtual MethodInfo RemoveMethod => GetRemoveMethod(nonPublic: true);
public virtual MethodInfo RaiseMethod => GetRaiseMethod(nonPublic: true);
public MethodInfo GetAddMethod() => GetAddMethod(nonPublic: false);
public MethodInfo GetRemoveMethod() => GetRemoveMethod(nonPublic: false);
public MethodInfo GetRaiseMethod() => GetRaiseMethod(nonPublic: false);
public abstract MethodInfo GetAddMethod(bool nonPublic);
public abstract MethodInfo GetRemoveMethod(bool nonPublic);
public abstract MethodInfo GetRaiseMethod(bool nonPublic);
public virtual bool IsMulticast
{
get
{
Type cl = EventHandlerType;
Type mc = typeof(MulticastDelegate);
return mc.IsAssignableFrom(cl);
}
}
public virtual Type EventHandlerType
{
get
{
MethodInfo m = GetAddMethod(true);
ParameterInfo[] p = m.GetParametersNoCopy();
Type del = typeof(Delegate);
for (int i = 0; i < p.Length; i++)
{
Type c = p[i].ParameterType;
if (c.IsSubclassOf(del))
return c;
}
return null;
}
}
[DebuggerHidden]
[DebuggerStepThrough]
public virtual void AddEventHandler(object target, Delegate handler)
{
MethodInfo addMethod = GetAddMethod(nonPublic: false);
if (addMethod == null)
throw new InvalidOperationException(SR.InvalidOperation_NoPublicAddMethod);
#if FEATURE_COMINTEROP
if (addMethod.ReturnType == typeof(EventRegistrationToken))
throw new InvalidOperationException(SR.InvalidOperation_NotSupportedOnWinRTEvent);
#endif //#if FEATURE_COMINTEROP
addMethod.Invoke(target, new object[] { handler });
}
[DebuggerHidden]
[DebuggerStepThrough]
public virtual void RemoveEventHandler(object target, Delegate handler)
{
MethodInfo removeMethod = GetRemoveMethod(nonPublic: false);
if (removeMethod == null)
throw new InvalidOperationException(SR.InvalidOperation_NoPublicRemoveMethod);
#if FEATURE_COMINTEROP
ParameterInfo[] parameters = removeMethod.GetParametersNoCopy();
if (parameters[0].ParameterType == typeof(EventRegistrationToken))
throw new InvalidOperationException(SR.InvalidOperation_NotSupportedOnWinRTEvent);
#endif //#if FEATURE_COMINTEROP
removeMethod.Invoke(target, new object[] { handler });
}
public override bool Equals(object obj) => base.Equals(obj);
public override int GetHashCode() => base.GetHashCode();
public static bool operator ==(EventInfo left, EventInfo right)
{
if (object.ReferenceEquals(left, right))
return true;
if ((object)left == null || (object)right == null)
return false;
return left.Equals(right);
}
public static bool operator !=(EventInfo left, EventInfo right) => !(left == right);
}
}
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