Hi,
I have a simple task to create a type and save it to dll.
public static void WriteAType()
{
AssemblyNameDefinition name = new
AssemblyNameDefinition("CecilAssembly", new Version(1, 0));
AssemblyDefinition assembly =
AssemblyDefinition.CreateAssembly(name, "CecilAssembly", ModuleKind.Dll);
ModuleDefinition module =
ModuleDefinition.CreateModule("myModule", ModuleKind.Dll);
assembly.Modules.Add(module);
TypeReference objectReference = module.Import(typeof (object));
var met = objectReference.Resolve().Methods;
TypeDefinition typeDef = new TypeDefinition("sample", "Main",
TypeAttributes.Class | TypeAttributes.Public);
AddEmptyConstructor(typeDef, met[0], module);
TypeDefinition resolved = typeDef.Resolve();
module.Types.Add(resolved);
assembly.Write("CecilAssembly.dll");
}
private static void AddEmptyConstructor(TypeDefinition type,
MethodReference baseEmptyConstructor, ModuleDefinition module)
{
const MethodAttributes methodAttributes =
MethodAttributes.Public | MethodAttributes.HideBySig |
MethodAttributes.SpecialName | MethodAttributes.RTSpecialName;
var method = new MethodDefinition(".ctor", methodAttributes,
module.TypeSystem.Void);
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg_0));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Call,
baseEmptyConstructor));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
type.Methods.Add(method);
}
when I open ilSpy on CecilAssembly.dll I see empty one.
I found one snippet where, one guy, creates a type and saves it to
MainModule at AssemblyDefinition and actualy ilSpy shows content of that
type.
I modified code above a bit, here is a snippet:
public static void ExploreCecilType()
{
AssemblyNameDefinition name = new
AssemblyNameDefinition("mycecil", new Version(1, 0));
AssemblyDefinition assembly =
AssemblyDefinition.CreateAssembly(name, "myModule", ModuleKind.Console);
ModuleDefinition module = assembly.MainModule;
TypeReference objectRef = module.Import(typeof (object));
TypeDefinition fooType = new TypeDefinition("", "Foo",
TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.AnsiClass |
TypeAttributes.AutoClass, objectRef);
module.Types.Add(fooType);
AddEmptyConstructor(fooType, objectRef.Resolve().Methods[0],
module);
assembly.Write("mycecil.dll");
}
When I launch this, it gives me:
Unhandled Exception: System.ArgumentException: Member 'System.Void
System.Object
::.ctor()' is declared in another module and needs to be imported
didn't I just import it with "TypeReference objectRef =
module.Import(typeof (object));"?
Is there a way to create a type and save it? Why modules are not saved when
I create my own? How to reference a mscorlib?
Thanks.
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