再来具体看一下Remove()方法的底层实现代码，RemoveAll和Remove两个方法为System.Delegate类型中，CombineImpl方法在MulticastDelegate重写。：
public static Delegate RemoveAll(Delegate source， Delegate value)
{
Delegate newDelegate = null;
do
{
newDelegate = source;
source = Remove(source， value);
}
while (newDelegate != source);
return newDelegate;
}
[System.Security.SecuritySafeCritical]
public static Delegate Remove(Delegate source， Delegate value)
{
if (source == null)
return null;
if (value == null)
return source;
if (!InternalEqualTypes(source， value))
throw new ArgumentException(Environment.GetResourceString("Arg_DlgtTypeMis"));
return source.RemoveImpl(value);
}
[System.Security.SecuritySafeCritical]
protected override sealed Delegate RemoveImpl(Delegate value)
{             MulticastDelegate v = value as MulticastDelegate;
if (v == null)
return this;
if (v._invocationList as Object[] == null)
{
Object[] invocationList = _invocationList as Object[];
if (invocationList == null)
{
if (this.Equals(value))
return null;
}
else
{
int invocationCount = (int)_invocationCount;
for (int i = invocationCount; --i >= 0; )
{
if (value.Equals(invocationList[i]))
{
if (invocationCount == 2)
{
return (Delegate)invocationList[1-i];
}
else
{
Object[] list = DeleteFromInvocationList(invocationList， invocationCount， i， 1);
return NewMulticastDelegate(list， invocationCount-1， true);
}
}
}
}
}
else
{
Object[] invocationList = _invocationList as Object[];
if (invocationList != null) {
int invocationCount = (int)_invocationCount;
int vInvocationCount = (int)v._invocationCount;
for (int i = invocationCount - vInvocationCount; i >= 0; i--)
{
if (EqualInvocationLists(invocationList， v._invocationList as Object[]， i， vInvocationCount))
{
if (invocationCount - vInvocationCount == 0)
{
return null;
}
else if (invocationCount - vInvocationCount == 1)
{
return (Delegate)invocationList[i != 0 ? 0 : invocationCount-1];
}
else
{
Object[] list = DeleteFromInvocationList(invocationList， invocationCount， i， vInvocationCount);
return NewMulticastDelegate(list， invocationCount - vInvocationCount， true);
}
}
}
}
}
return this;
}
　　在以上的代码中，我们了解到了在.NET底层是如何实现委托实例的绑定和删除绑定。
　　在调用委托实例时，所有的操作都是顺序执行的。如果调用具有一个非void的返回类型，则调用的返回值是后一个操作的返回值。如果调用列表中任何操作抛出异常，都会阻止执行后续的操作。
　　在上面提到了委托列表中出现非void实例调用，如果委托实例中出现多个非void调用，并且需要获取所有的委托实例的返回值结果，那么应该如何操作，在.NET红提供了一个方法GetInvocationList()，用于获取委托链表。
　　接下来具体了解一下GetInvocationList()的底层代码：
[System.Security.SecuritySafeCritical]
public override sealed Delegate[] GetInvocationList()
{
Delegate[] del;
Object[] invocationList = _invocationList as Object[];
if (invocationList == null)
{
del = new Delegate[1];
del[0] = this;
}
else
{
int invocationCount = (int)_invocationCount;
del = new Delegate[invocationCount];
for (int i = 0; i < invocationCount; i++)
del[i] = (Delegate)invocationList[i];
}
return del;
}
　　当获取到委托实例列表后，可采用循环迭代的方式，依次获取每个委托实例的返回值。
　　再来了解一个属性Method，具体看一下此属性的底层实现代码：
public MethodInfo Method
{
get
{
return GetMethodImpl();
}
}
[System.Security.SecuritySafeCritical]
protected virtual MethodInfo GetMethodImpl()
{
if ((_methodBase == null) || !(_methodBase is MethodInfo))
{
IRuntimeMethodInfo method = FindMethodHandle();
RuntimeType declaringType = RuntimeMethodHandle.GetDeclaringType(method);
if (RuntimeTypeHandle.IsGenericTypeDefinition(declaringType) || RuntimeTypeHandle.HasInstantiation(declaringType))
{
bool isStatic = (RuntimeMethodHandle.GetAttributes(method) & MethodAttributes.Static) != (MethodAttributes)0;
if (!isStatic)
{
if (_methodPtrAux == (IntPtr)0)
{
Type currentType = _target.GetType();
Type targetType = declaringType.GetGenericTypeDefinition();
while (currentType != null)
{
if (currentType.IsGenericType &&
currentType.GetGenericTypeDefinition() == targetType)
{
declaringType = currentType as RuntimeType;
break;
}
currentType = currentType.BaseType;
}
BCLDebug.Assert(currentType != null || _target.GetType().IsCOMObject， "The class hierarchy should declare the method");
}
else
{
MethodInfo invoke = this.GetType().GetMethod("Invoke");
declaringType = (RuntimeType)invoke.GetParameters()[0].ParameterType;
}
}
}
_methodBase = (MethodInfo)RuntimeType.GetMethodBase(declaringType， method);
}
return (MethodInfo)_methodBase;
}
　　以上是System.Delegate类中的定义，接下来看一下MulticastDelegate重写：
[System.Security.SecuritySafeCritical]
protected override MethodInfo GetMethodImpl()
{
if (_invocationCount != (IntPtr)0 && _invocationList != null)
{
Object[] invocationList = _invocationList as Object[];
if (invocationList != null)
{
int index = (int)_invocationCount - 1;
return ((Delegate)invocationList[index]).Method;
}
MulticastDelegate innerDelegate = _invocationList as MulticastDelegate;
if (innerDelegate != null)
{
return innerDelegate.GetMethodImpl();
}
}
else if (IsUnmanagedFunctionPtr())
{
if ((_methodBase == null) || !(_methodBase is MethodInfo))
{
IRuntimeMethodInfo method = FindMethodHandle();
RuntimeType declaringType = RuntimeMethodHandle.GetDeclaringType(method);
if (RuntimeTypeHandle.IsGenericTypeDefinition(declaringType) || RuntimeTypeHandle.HasInstantiation(declaringType))
{
RuntimeType reflectedType = GetType() as RuntimeType;
declaringType = reflectedType;
}
_methodBase = (MethodInfo)RuntimeType.GetMethodBase(declaringType， method);
}
return (MethodInfo)_methodBase;
}
return base.GetMethodImpl();
}
　　以上是对委托的相关定义，以及有关委托的一些操作方法的说明，没有具体指出如何去创建和使用委托，因为委托的简单创建和一般应用，对于大部分开发者来说是相对较为简单的，因为微软在不断的对C#的语法进行提升和修改，极大的简化了对应的操作。但是正是由于在应用层做了较大的封装，这也会导致特性在底层的复杂度慢慢的增大。