6

我想用 ILSpy 反汇编整个 .NET 程序集。

我将此代码用作基础：
http ://skysigal.xact-solutions.com/Blog/tabid/427/entryid/2488/Default.aspx

它工作正常，就在我有一个引用 Npgsql.dll（或任何其他非 gac 程序集）的程序集时，我得到一个 AssemblyResolutionException。

无法解析程序集：'Npgsql，版本 = 2.0.11.92，文化 = 中性，PublicKeyToken = 5d8b90d52f46fda7'

我知道如何获取引用的程序集，但如何将它们添加到 ast ？

    // SqlWebAdmin.Models.Decompiler.DecompileAssembly("xy.dll");
    public static string DecompileAssembly(string pathToAssembly)
    {
        //Assembly assembly = Assembly.LoadFrom(pathToAssembly);
        System.Reflection.Assembly assembly = System.Reflection.Assembly.ReflectionOnlyLoadFrom(pathToAssembly);
        //assembly.GetReferencedAssemblies();

        //assembly.GetReferencedAssemblies(assembly);
        Mono.Cecil.AssemblyDefinition assemblyDefinition =
            Mono.Cecil.AssemblyDefinition.ReadAssembly(pathToAssembly);



        ICSharpCode.Decompiler.Ast.AstBuilder astBuilder = new ICSharpCode.Decompiler.Ast.AstBuilder(new ICSharpCode.Decompiler.DecompilerContext(assemblyDefinition.MainModule));
        astBuilder.AddAssembly(assemblyDefinition);


        //new Helpers.RemoveCompilerAttribute().Run(decompiler.CompilationUnit);
        using (System.IO.StringWriter output = new System.IO.StringWriter())
        {
            astBuilder.GenerateCode(new ICSharpCode.Decompiler.PlainTextOutput(output));
            string result = output.ToString();
            return result;
        }

        return "";
    } // End Function DecompileAssembly
4

4 回答 4

14

您需要告诉 ILSpy 正在使用的底层元数据读取器 Cecil，您的程序集在哪里。你可以写：

var resolver = new DefaultAssemblyResolver();
resolver.AddSearchDirectory("path/to/my/assemblies");

var parameters = new ReaderParameters
{
    AssemblyResolver = resolver,
};

var assembly = AssemblyDefinition.ReadAssembly(pathToAssembly, parameters);

这是告诉 Cecil 在哪里解析引用程序集的最自然方式。这样，您可以删除使用 System.Reflection 加载程序集的行，并且仅使用 ILSpy 堆栈。

于 2012-01-02T18:20:54.417 回答
4

这是改进的@Nayan 答案。如果要忽略缺少的程序集，请复制此类：

using Mono.Cecil;

public class IgnoringExceptionsAssemblyResolver : DefaultAssemblyResolver
{
    public override AssemblyDefinition Resolve(AssemblyNameReference name)
    {
        try
        {
            return base.Resolve(name);
        }
        catch
        {
            return null;
        }
    }
}

并像这样使用它：

var assembly = AssemblyDefinition.ReadAssembly(path, new ReaderParameters() {
    AssemblyResolver = new IgnoringExceptionsAssemblyResolver()
});
于 2016-01-29T09:31:40.647 回答
2

除了 JB Evain 建议的内容之外，此代码还有助于避免异常。您所要做的就是在解析器中处理异常。

我承认，这不是最好的方法。但它适用于这种情况："If I am decompiling a DLL on a system where the referred assemblies are not present, the decompilation fails (with exception.) At least, i would like to see the decompile code, for whatever has been resolved."

using System;
using System.Collections.Generic;
using Mono.Cecil;

public class MyAssemblyResolver : BaseAssemblyResolver
{
    private readonly IDictionary<string, AssemblyDefinition> cache;
    public MyAssemblyResolver()
    {
        this.cache = new Dictionary<string, AssemblyDefinition>(StringComparer.Ordinal);
    }
    public override AssemblyDefinition Resolve(AssemblyNameReference name)
    {
        if (name == null)
            throw new ArgumentNullException("name");
        AssemblyDefinition assemblyDefinition = null;
        if (this.cache.TryGetValue(name.FullName, out assemblyDefinition))
            return assemblyDefinition;
        try  //< -------- My addition to the code.
        {
            assemblyDefinition = base.Resolve(name);
            this.cache[name.FullName] = assemblyDefinition;
        }
        catch { } //< -------- My addition to the code.
        return assemblyDefinition;
    }
    protected void RegisterAssembly(AssemblyDefinition assembly)
    {
        if (assembly == null)
            throw new ArgumentNullException("assembly");
        string fullName = assembly.Name.FullName;
        if (this.cache.ContainsKey(fullName))
            return;
        this.cache[fullName] = assembly;
    }
}

并像这样使用它：

var rp = new Mono.Cecil.ReaderParameters() { AssemblyResolver = new MyAssemblyResolver() };
var assemblyDefinition = Mono.Cecil.AssemblyDefinition.ReadAssembly(assemblyStream, rp);
var astBuilder = new ICSharpCode.Decompiler.Ast.AstBuilder(
     new ICSharpCode.Decompiler.DecompilerContext(assemblyDefinition.MainModule));
astBuilder.AddAssembly(assemblyDefinition);




我实际上希望看到反编译器的增强功能：它当前忽略了ReaderParameters该用户在DefaultAssemblyResolver课堂上设置的内容。

用法：

var rp = new Mono.Cecil.ReaderParameters();
var assemblyDefinition = Mono.Cecil.AssemblyDefinition.ReadAssembly(assemblyStream, rp);

当前DefaultAssemblyResolver代码：

public override AssemblyDefinition Resolve(AssemblyNameReference name)
{
    if (name == null)
    {
        throw new ArgumentNullException("name");
    }
    AssemblyDefinition assemblyDefinition;
    if (this.cache.TryGetValue(name.FullName, out assemblyDefinition))
    {
        return assemblyDefinition;
    }
    assemblyDefinition = base.Resolve(name); // <---------
// Is the `ReaderParameters` object set by user, used to resolve in `base` class?

    this.cache[name.FullName] = assemblyDefinition;
    return assemblyDefinition;
}
于 2013-08-06T12:33:33.977 回答
1

基于 Mono.Cecil 源，我猜您可能可以使用Mono.Cecil.DefaultAssemblyResolver该类来处理这个问题。

而不是这段代码：

Mono.Cecil.AssemblyDefinition assemblyDefinition =
    Mono.Cecil.AssemblyDefinition.ReadAssembly(pathToAssembly);

试试这个：

Mono.Cecil.AssemblyDefinition assemblyDefinition =
    new Mono.Cecil.DefaultAssemblyResolver().Resolve(System.Reflection.AssemblyName.GetAssemblyName(pathToAssembly).ToString());

编辑

虽然我最初的建议可能有效，也可能无效（我从来没有做过，所以不能保证），您可能希望查看Mono.Addins 项目Mono.Addins.CecilReflector.dll中的程序集以帮助缓解这些问题。它也基于 Mono.Cecil（就像 ILSpy 一样），因此即使 Mono.Addins 是一个可扩展性库的一般前提不能满足您的需求，它也可能包含一些用于您的目的的代码，或者至少可以从中学习。

于 2012-01-01T00:14:18.587 回答