CODEWITHSUNDEEP
compiler-errors.net-assemblysystem.reflectionreflection.emitilgenerator
Lian
Lian

Reputation: 1

Why do I get System.InvalidProgramException: Common Language Runtime detected an invalid program

I'm just trying to generate code that just generate a int constant. Here is the code: string name = Path.GetFileNameWithoutExtension(outputPath); string filename = Path.GetFileName(outputPath);

AssemblyName assemblyName = new AssemblyName(name);

AssemblyBuilder assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); //, Path.GetDirectoryName(outputPath));
ModuleBuilder moduleBuilder = assembly.DefineDynamicModule(name, filename);

TypeBuilder programType = moduleBuilder.DefineType(name + ".Program");
MethodBuilder mainMethod = programType.DefineMethod("Main", MethodAttributes.Static, typeof(void), System.Type.EmptyTypes);
assembly.SetEntryPoint(mainMethod);
ILGenerator generator = mainMethod.GetILGenerator();
generator.Emit(OpCodes.Ldc_I4, (int)Value);
generator.Emit(OpCodes.Ret);
programType.CreateType();
assembly.Save(filename);

And when i execute the .exe it gives that exception Why?

Upvotes: -1

Views: 648

Answers (1)

Regis Portalez
Regis Portalez

Reputation: 4860

As specified here, you define a method with a void return type.

But the IL you generates returns a int (the content of your stack before the ret instruction).

If you replace the defineMethod line by 

MethodBuilder mainMethod = programType.DefineMethod("Main", MethodAttributes.Static, typeof(int), System.Type.EmptyTypes);

You'll get things right.

You can usually find most of IL errors using ILspy to disassemble your executable (or library).

In your case, you'd see : 

static void Main()
{
    12;
}

which is obviously wrong.

Upvotes: 0

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