这个答案的第一部分是错误的，我只是留下它，以便 cmets 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需求，真幸运！
见TypeBuilder.DefineMethodOverride
编辑：
写这个答案，我只记得re-mix 也允许你这样做。不过这要困难得多。
Re-mix 是一个在 C# 中“模拟”mixin 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。
编辑 2：这是一个使用 re-mix 的示例（在不支持它的类上实现 INotifyPropertyChanged，并且不知道 mixins）。
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;
}
}
还有测试：
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))]
和
[Extends(typeof(INPCTester))] //commented out in my example
和
[ImplementsINPC] //commented out in my example
具有完全相同的效果。问题在于您希望在哪里定义特定的 mixin 应用于特定的类。
示例 2：覆盖 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<>))
{
}
}
这个例子是我对 re-mix 给出的动手实验的实现。您可以在那里找到更多信息。