如何使用dnlib库获取所有方法的说明?

时间:2014-08-02 11:47:20

标签: .net vb.net winforms reflection dnlib

我正在尝试使用dnlib项目的de4dot库来加载程序集并获取包含在“body”上的 IL 指令所有的方法。

我已经编译了这个 VB.NET 来源:

Public Class Main

    Public Sub testmethod(ByVal testparameter As String)
        MsgBox(testparameter)
    End Sub

    Public Class Test2

        Public Function testfunction(ByVal testparameter As String) As String
            Return testparameter
        End Function

    End Class

End Class

我知道编译器会修改很多东西,但我认为方法名称(在这种情况下)不会被修改,如果我错了请纠正我。

然后我试图用这段代码检索这些方法:

Imports dnlib.DotNet
Imports dnlib.DotNet.Emit

Private Sub Test_Handler() Handles MyBase.Shown

    Dim asmResolver As New AssemblyResolver()
    Dim modCtx As New ModuleContext(asmResolver)

    ' All resolved assemblies will also get this same modCtx
    asmResolver.DefaultModuleContext = modCtx

    ' Enable the TypeDef cache for all assemblies that are loaded
    ' by the assembly resolver. Only enable it if all auto-loaded
    ' assemblies are read-only.
    asmResolver.EnableTypeDefCache = True

    Dim Assembly As ModuleDefMD = ModuleDefMD.Load("C:\WindowsApplication.exe")
    Assembly.Context = modCtx
    ' Use the previously created (and shared) context
    Assembly.Context.AssemblyResolver.AddToCache(Assembly)

    Dim Members As IEnumerable(Of MemberRef) = Assembly.GetMemberRefs

    For Each m As MemberRef In Members

        If m.IsMethodRef Then

            Dim Method As MethodDef = m.ResolveMethod

            If Method.HasBody Then

                Dim sb As New System.Text.StringBuilder
                With sb
                    .AppendLine(String.Format("Method Name: {0}", Method.FullName))
                    .AppendLine()
                    .AppendLine(String.Format("Method Signature: {0}", Method.Signature.ToString))
                    .AppendLine()
                    .AppendLine(String.Format("Method Instructions: {0}", Environment.NewLine &
                                              String.Join(Environment.NewLine, Method.Body.Instructions)))
                End With
                MessageBox.Show(sb.ToString)

            End If

        End If

    Next

End Sub

问题是我见过的这个库的唯一文档是XML文档文件和dnlib站点上的一些非常基本的例子,帮助我编写上面的代码,但我不知道如何解决/检索那些方法因为我没有正确地做到这一点,上面的代码并没有解决我编译的任何方法( testmethod testfunction ),而是它向我展示了很多构造函数(.ctor)和其他方法。

我想要做的只是执行我编译的源代码中包含的所有方法(私有,公共等)的迭代,而不管项目具有的类的数量,也不管包含哪个类获取其指示的具体方法。

1 个答案:

答案 0 :(得分:2)

看来你只是在大会中四处寻找,所以你得到的就是AssemblyInfo.vb中定义的内容。您可能想要做的是迭代Assembly中的Types,然后深入查找为您要查找的成员或属性定义的成员或属性。

此代码应该指向正确的方向:

Dim modDef As ModuleDefMD = ModuleDefMD.Load("C:\Temp\ConsoleApplication1.exe")

For Each t As TypeDef In modDef.GetTypes
    'print the Type name
    Console.WriteLine(t.Name)

    ' stupid way to match a Type, but will work for demo purposes
    If t.FullName.StartsWith("ConsoleApplication1.Module1") Then

        For Each meth As MethodDef In t.Methods
            ' print the method name
            Console.WriteLine("     Method: {0}", meth.Name)
        Next

    End If
Next

输出如下所示,请注意列出了您的方法。

<Module>
MyApplication
MyComputer
MyProject
MyWebServices
ThreadSafeObjectProvider`1
InternalXmlHelper
RemoveNamespaceAttributesClosure
Module1
     Method: Main
     Method: testmethod
Test2
     Method: .ctor
     Method: testfunction
Resources
MySettings
MySettingsProperty