这个答案的第一部分是错误的,我只是留下它,以便评论中的演变有意义。请参阅编辑。
您不是在寻找反射,而是在寻找发射(反之亦然)。
特别是,有一种方法可以满足您的要求,您很幸运!
See TypeBuilder.DefineMethodOverride http://msdn.microsoft.com/en-us/library/system.reflection.emit.typebuilder.definemethodoverride.aspx
EDIT:
写下这个答案,我才想起来re-mix https://github.com/re-motion/Remix也允许您这样做。但这要困难得多。
Re-mix 是一个在 C# 中“模拟”mixins 的框架。在其基本方面,您可以将其视为具有默认实现的接口。如果你走得更远,它会变得更多。
EDIT 2:下面是一个使用重新混合的示例(在不支持 INotifyPropertyChanged 的类上实现 INotifyPropertyChanged,并且不知道混合)。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Remotion.Mixins;
using System.ComponentModel;
using MixinTest;
[assembly: Mix(typeof(INPCTester), typeof(INotifyPropertyChangedMixin))]
namespace MixinTest
{
//[Remotion.Mixins.CompleteInterface(typeof(INPCTester))]
public interface ICustomINPC : INotifyPropertyChanged
{
void RaisePropertyChanged(string prop);
}
//[Extends(typeof(INPCTester))]
public class INotifyPropertyChangedMixin : Mixin<object>, ICustomINPC
{
public event PropertyChangedEventHandler PropertyChanged;
public void RaisePropertyChanged(string prop)
{
PropertyChangedEventHandler handler = this.PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(prop));
}
}
}
public class ImplementsINPCAttribute : UsesAttribute
{
public ImplementsINPCAttribute()
: base(typeof(INotifyPropertyChangedMixin))
{
}
}
//[ImplementsINPC]
public class INPCTester
{
private string m_Name;
public string Name
{
get { return m_Name; }
set
{
if (m_Name != value)
{
m_Name = value;
((ICustomINPC)this).RaisePropertyChanged("Name");
}
}
}
}
public class INPCTestWithoutMixin : ICustomINPC
{
private string m_Name;
public string Name
{
get { return m_Name; }
set
{
if (m_Name != value)
{
m_Name = value;
this.RaisePropertyChanged("Name");
}
}
}
public void RaisePropertyChanged(string prop)
{
PropertyChangedEventHandler handler = this.PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(prop));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
和测试:
static void INPCImplementation()
{
Console.WriteLine("INPC implementation and usage");
var inpc = ObjectFactory.Create<INPCTester>(ParamList.Empty);
Console.WriteLine("The resulting object is castable as INPC: " + (inpc is INotifyPropertyChanged));
((INotifyPropertyChanged)inpc).PropertyChanged += inpc_PropertyChanged;
inpc.Name = "New name!";
((INotifyPropertyChanged)inpc).PropertyChanged -= inpc_PropertyChanged;
Console.WriteLine();
}
static void inpc_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
Console.WriteLine("Hello, world! Property's name: " + e.PropertyName);
}
//OUTPUT:
//INPC implementation and usage
//The resulting object is castable as INPC: True
//Hello, world! Property's name: Name
请注意:
[assembly: Mix(typeof(INPCTester), typeof(INotifyPropertyChangedMixin))]
and
[Extends(typeof(INPCTester))] //commented out in my example
and
[ImplementsINPC] //commented out in my example
具有完全相同的效果。这取决于您希望在何处定义将特定 mixin 应用于特定类。
示例 2:重写 Equals 和 GetHashCode
public class EquatableByValuesMixin<[BindToTargetType]T> : Mixin<T>, IEquatable<T> where T : class
{
private static readonly FieldInfo[] m_TargetFields = typeof(T).GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
bool IEquatable<T>.Equals(T other)
{
if (other == null)
return false;
if (Target.GetType() != other.GetType())
return false;
for (int i = 0; i < m_TargetFields.Length; i++)
{
object thisFieldValue = m_TargetFields[i].GetValue(Target);
object otherFieldValue = m_TargetFields[i].GetValue(other);
if (!Equals(thisFieldValue, otherFieldValue))
return false;
}
return true;
}
[OverrideTarget]
public new bool Equals(object other)
{
return ((IEquatable<T>)this).Equals(other as T);
}
[OverrideTarget]
public new int GetHashCode()
{
int i = 0;
foreach (FieldInfo f in m_TargetFields)
i ^= f.GetValue(Target).GetHashCode();
return i;
}
}
public class EquatableByValuesAttribute : UsesAttribute
{
public EquatableByValuesAttribute()
: base(typeof(EquatableByValuesMixin<>))
{
}
}
该示例是我对重新混合给出的动手实验室的实现。您可以在那里找到更多信息。