有一大把的问题和答案各地 AOP 中的 NET 这里对堆栈＆NBSP;溢出，常提的PostSharp和其它第三方产品。因此，似乎有相当多的AOP optons在.NET和C＃的世界。但是，其中每个都有自己的限制，下载前途PostSharp 后，我在他们的文档发现，方法必须是虚的，以便能够注入code （编辑：见ChrisWue的回答和我的意见 - 虚拟约束必须一直对竞争者之一，我想）。我没有调查这一说法的准确性任何进一步的，但它的categoricality让我返回到堆栈＆NBSP;溢

There are a a lot of questions and answers around AOP in .NET here on Stack Overflow, often mentioning PostSharp and other third-party products. So there seems to be quite a range of AOP optons in the .NET and C# world. But each of those has their restrictions, and after downloading the promising PostSharp I found in their documentation that 'methods have to be virtual' in order to be able to inject code (edit: see ChrisWue's answer and my comment - the virtual constraint must have been on one of the contenders, I suppose). I haven't investigated the accuracy of this statement any further, but it's categoricality made me return back to Stack Overflow.

所以我希望得到的答案，这个非常具体的问题：

So I'd like to get an answer to this very specific question:

我想注入简单如果（某些条件）Console.WriteLine风格的 code到每一个方法和属性（静态，封闭，内部，虚拟，非虚拟的，无所谓）的我的项目不具有自定义的注释，以便在运行时动态测试我的软件。这种注入code不应该停留在发布版本，它只是意味着在开发过程中的动态测试（线程相关的）。

I want to inject simple "if (some-condition) Console.WriteLine" style code to every method and property (static, sealed, internal, virtual, non-virtual, doesn't matter) in my project that does not have a custom annotation, in order to dynamically test my software at run-time. This injected code should not remain in the release build, it is just meant for dynamic testing (thread-related) during development.

什么是做到这一点的最简单的方法是什么？我偶然发现 Mono.Cecil能做到，看起来完美，但你似乎有写$要在IL注入C $℃。这不是一个大问题，它很容易使用Mono.Cecil能得到一个IL版code C＃编写的。但无论如何，如果有更简单的东西，最好是连内置到.NET（我仍然在.NET 3.5），我想知道。 [更新：如果建议的工具不是.NET Framework的一部分，这将是很好，如果它是开源的，像Mono.Cecil能做到，或免费提供]

What's the easiest way to do this? I stumbled upon Mono.Cecil, which looks ideal, except that you seem to have to write the code that you want to inject in IL. This isn't a huge problem, it's easy to use Mono.Cecil to get an IL version of code written in C#. But nevertheless, if there was something simpler, ideally even built into .NET (I'm still on .NET 3.5), I'd like to know. [Update: If the suggested tool is not part of the .NET Framework, it would be nice if it was open-source, like Mono.Cecil, or freely available]

推荐答案

我是能够解决的问题是 Mono.Cecil能做到。我还惊奇地发现易学，易用，功能强大是。在几乎完全没有证件也没有改变这一点。

I was able to solve the problem with Mono.Cecil. I am still amazed how easy to learn, easy to use, and powerful it is. The almost complete lack of documentation did not change that.

这些文件都是我用的3个来源：

These are the 3 sources of documentation I used:

第一个链接提供了一个非常不错的介绍，但因为它描述了丝丝的旧版本 - 和很多已经在此期间改变 - 第二个环节是翻译介绍塞西尔0.9非常有帮助。经过起步，中（也没有记录）来源$ C ​​$ C是无价的，并回答了每一个问题，我有 - 想到也许那些对.NET平台一般，但有吨上某处的书籍和材料在网上我敢肯定，

The first link provides a very gentle introduction, but as it describes an older version of Cecil - and much has changed in the meantime - the second link was very helpful in translating the introduction to Cecil 0.9. After getting started, the (also not documented) source code was invaluable and answered every question I had - expect perhaps those about the .NET platform in general, but there's tons of books and material on that somewhere online I'm sure.

我现在可以把DLL或EXE文件，修改它，并把它写回磁盘。我还没有完成的唯一的事情是搞清楚如何保持调试信息 - 文件名，行号等当前正在写的DLL或EXE文件后迷路。我的背景是不是.NET，所以我猜在这里，我的猜测是，我需要看看 mono.cecil.pdb 来解决这个问题。后来的某个地方 - 它并不适合我，超级重要的现在。我创建这个EXE文件，运行应用程序 - 这是一个复杂的GUI应用程序，成长多年来的所有行李，你会希望找到这样一块的，啊哈，软件 - 它检查的东西和记录错误我的。

I can now take a DLL or EXE file, modify it, and write it back to disk. The only thing that I haven't done yet is figuring out how to keep debugging information - file name, line number, etc. currently get lost after writing the DLL or EXE file. My background isn't .NET, so I'm guessing here, and my guess would be that I need to look at mono.cecil.pdb to fix that. Somewhere later - it's not that super important for me right now. I'm creating this EXE file, run the application - and it's a complex GUI application, grown over many years with all the baggage you would expect to find in such a piece of, ahem, software - and it checks things and logs errors for me.

下面是我的code中的要点：

Here's the gist of my code:

DefaultAssemblyResolver assemblyResolver = new DefaultAssemblyResolver();
// so it won't complain about not finding assemblies sitting in the same directory as the dll/exe we are going to patch
assemblyResolver.AddSearchDirectory(assemblyDirectory);
var readerParameters = new ReaderParameters { AssemblyResolver = assemblyResolver };

AssemblyDefinition assembly = AssemblyDefinition.ReadAssembly(assemblyFilename, readerParameters);

foreach (var moduleDefinition in assembly.Modules)
{
    foreach (var type in ModuleDefinitionRocks.GetAllTypes(moduleDefinition))
    {
        foreach (var method in type.Methods)
        {
            if (!HasAttribute("MyCustomAttribute", method.method.CustomAttributes)
            {
              ILProcessor ilProcessor = method.Body.GetILProcessor();
              ilProcessor.InsertBefore(method.Body.Instructions.First(), ilProcessor.Create(OpCodes.Call, threadCheckerMethod));
// ...

private static bool HasAttribute(string attributeName, IEnumerable<CustomAttribute> customAttributes)
{
    return GetAttributeByName(attributeName, customAttributes) != null;
}

private static CustomAttribute GetAttributeByName(string attributeName, IEnumerable<CustomAttribute> customAttributes)
{
    foreach (var attribute in customAttributes)
        if (attribute.AttributeType.FullName == attributeName)
            return attribute;
    return null;
}

如果有人知道一个简单的方法如何得到这个工作，我仍然有兴趣在回答我也不会纪念这个作为解决方案 - 除非没有更简单的解决方案显示了

If someone knows an easier way how to get this done, I'm still interested in an answer and I won't mark this as the solution - unless no easier solutions show up.