使用 Mono.Cecil。它是一个独立的程序集，可以在 Microsoft .NET 和 Mono 上运行。 （我想我在写下面的代码时使用的是 0.6 或更高版本）
假设您有许多程序集
IEnumerable<AssemblyDefinition> assemblies;
使用 AssemblyFactory 获取这些（加载一个？）
下面的 sn-p 将枚举所有类型的这些程序集中方法的所有用法
methodUsages = assemblies
.SelectMany(assembly => assembly.MainModule.Types.Cast<TypeDefinition>())
.SelectMany(type => type.Methods.Cast<MethodDefinition>())
.Where(method => null != method.Body) // allow abstracts and generics
.SelectMany(method => method.Body.Instructions.Cast<Instruction>())
.Select(instr => instr.Operand)
.OfType<MethodReference>();
这将返回对方法的所有引用（因此包括在反射中使用，或构造可能会或可能不会执行的表达式）。因此，这可能不是很有用，除了向您展示使用 Cecil API 可以做的事情而不需要太多努力:)
请注意，此示例假定 Cecil 的版本较旧（主流单声道版本中的那个）。较新的版本是
当然，在您的情况下，您可以将单个方法引用作为起点。假设您想检测何时可以实际上直接在“startingpoint”内部调用“mytargetmethod”：
MethodReference startingpoint; // get it somewhere using Cecil
MethodReference mytargetmethod; // what you are looking for
bool isCalled = startingpoint
.GetOriginalMethod() // jump to original (for generics e.g.)
.Resolve() // get the definition from the IL image
.Body.Instructions.Cast<Instruction>()
.Any(i => i.OpCode == OpCodes.Callvirt && i.Operand == (mytargetmethod));
调用树搜索
这是一个有效的 sn-p，它允许您递归搜索到（选定的）相互调用（间接）的方法。
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace StackOverflow
{
/*
* breadth-first lazy search across a subset of the call tree rooting in startingPoint
*
* methodSelect selects the methods to recurse into
* resultGen generates the result objects to be returned by the enumerator
*
*/
class CallTreeSearch<T> : BaseCodeVisitor, IEnumerable<T> where T : class
{
private readonly Func<MethodReference, bool> _methodSelect;
private readonly Func<Instruction, Stack<MethodReference>, T> _transform;
private readonly IEnumerable<MethodDefinition> _startingPoints;
private readonly IDictionary<MethodDefinition, Stack<MethodReference>> _chain = new Dictionary<MethodDefinition, Stack<MethodReference>>();
private readonly ICollection<MethodDefinition> _seen = new HashSet<MethodDefinition>(new CompareMembers<MethodDefinition>());
private readonly ICollection<T> _results = new HashSet<T>();
private Stack<MethodReference> _currentStack;
private const int InfiniteRecursion = -1;
private readonly int _maxrecursiondepth;
private bool _busy;
public CallTreeSearch(IEnumerable<MethodDefinition> startingPoints,
Func<MethodReference, bool> methodSelect,
Func<Instruction, Stack<MethodReference>, T> resultGen)
: this(startingPoints, methodSelect, resultGen, InfiniteRecursion)
{
}
public CallTreeSearch(IEnumerable<MethodDefinition> startingPoints,
Func<MethodReference, bool> methodSelect,
Func<Instruction, Stack<MethodReference>, T> resultGen,
int maxrecursiondepth)
{
_startingPoints = startingPoints.ToList();
_methodSelect = methodSelect;
_maxrecursiondepth = maxrecursiondepth;
_transform = resultGen;
}
public override void VisitMethodBody(MethodBody body)
{
_seen.Add(body.Method); // avoid infinite recursion
base.VisitMethodBody(body);
}
public override void VisitInstructionCollection(InstructionCollection instructions)
{
foreach (Instruction instr in instructions)
VisitInstruction(instr);
base.VisitInstructionCollection(instructions);
}
public override void VisitInstruction(Instruction instr)
{
T result = _transform(instr, _currentStack);
if (result != null)
_results.Add(result);
var methodRef = instr.Operand as MethodReference; // TODO select calls only?
if (methodRef != null && _methodSelect(methodRef))
{
var resolve = methodRef.Resolve();
if (null != resolve && !(_chain.ContainsKey(resolve) || _seen.Contains(resolve)))
_chain.Add(resolve, new Stack<MethodReference>(_currentStack.Reverse()));
}
base.VisitInstruction(instr);
}
public IEnumerator<T> GetEnumerator()
{
lock (this) // not multithread safe
{
if (_busy)
throw new InvalidOperationException("CallTreeSearch enumerator is not reentrant");
_busy = true;
try
{
int recursionLevel = 0;
ResetToStartingPoints();
while (_chain.Count > 0 &&
((InfiniteRecursion == _maxrecursiondepth) || recursionLevel++ <= _maxrecursiondepth))
{
// swapout the collection because Visitor will modify
var clone = new Dictionary<MethodDefinition, Stack<MethodReference>>(_chain);
_chain.Clear();
foreach (var call in clone.Where(call => HasBody(call.Key)))
{
// Console.Error.Write("\rCallTreeSearch: level #{0}, scanning {1,-20}\r", recursionLevel, call.Key.Name + new string(' ',21));
_currentStack = call.Value;
_currentStack.Push(call.Key);
try
{
_results.Clear();
call.Key.Body.Accept(this); // grows _chain and _results
}
finally
{
_currentStack.Pop();
}
_currentStack = null;
foreach (var result in _results)
yield return result;
}
}
}
finally
{
_busy = false;
}
}
}
private void ResetToStartingPoints()
{
_chain.Clear();
_seen.Clear();
foreach (var startingPoint in _startingPoints)
{
_chain.Add(startingPoint, new Stack<MethodReference>());
_seen.Add(startingPoint);
}
}
private static bool HasBody(MethodDefinition methodDefinition)
{
return !(methodDefinition.IsAbstract || methodDefinition.Body == null);
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
internal class CompareMembers<T> : IComparer<T>, IEqualityComparer<T>
where T: class, IMemberReference
{
public int Compare(T x, T y)
{ return StringComparer.InvariantCultureIgnoreCase.Compare(KeyFor(x), KeyFor(y)); }
public bool Equals(T x, T y)
{ return KeyFor(x).Equals(KeyFor(y)); }
private static string KeyFor(T mr)
{ return null == mr ? "" : String.Format("{0}::{1}", mr.DeclaringType.FullName, mr.Name); }
public int GetHashCode(T obj)
{ return KeyFor(obj).GetHashCode(); }
}
}
注意事项
- 对
Resolve() 做一些错误处理（为此我有一个扩展方法TryResolve()）
- 仅在调用操作（call、calli、callvirt ...）中选择性地选择
MethodReferences 的用法（参见//TODO）
典型用法：
public static IEnumerable<T> SearchCallTree<T>(this TypeDefinition startingClass,
Func<MethodReference, bool> methodSelect,
Func<Instruction, Stack<MethodReference>, T> resultFunc,
int maxdepth)
where T : class
{
return new CallTreeSearch<T>(startingClass.Methods.Cast<MethodDefinition>(), methodSelect, resultFunc, maxdepth);
}
public static IEnumerable<T> SearchCallTree<T>(this MethodDefinition startingMethod,
Func<MethodReference, bool> methodSelect,
Func<Instruction, Stack<MethodReference>, T> resultFunc,
int maxdepth)
where T : class
{
return new CallTreeSearch<T>(new[] { startingMethod }, methodSelect, resultFunc, maxdepth);
}
// Actual usage:
private static IEnumerable<TypeUsage> SearchMessages(TypeDefinition uiType, bool onlyConstructions)
{
return uiType.SearchCallTree(IsBusinessCall,
(instruction, stack) => DetectRequestUsage(instruction, stack, onlyConstructions));
}
注意是否完成像 DetectRequestUsage 这样的函数来满足您的需求完全由您自己决定（编辑：but see here）。 你可以做任何你想做的事，不要忘记：你将拥有完整的静态分析调用堆栈供你使用，所以你实际上可以用所有这些信息做一些非常简洁的事情！