MethodInjector.InjectMethod C# (CSharp) Метод

    MethodDefinition InjectMethod(TypeDefinition targetType, string eventInvokerName, FieldReference propertyChangedField)
    {
        var method = new MethodDefinition(eventInvokerName, GetMethodAttributes(targetType), msCoreReferenceFinder.VoidTypeReference);
        method.Parameters.Add(new ParameterDefinition("propertyName", ParameterAttributes.None, msCoreReferenceFinder.StringTypeReference));

        var handlerVariable = new VariableDefinition(msCoreReferenceFinder.PropChangedHandlerReference);
        method.Body.Variables.Add(handlerVariable);
        var boolVariable = new VariableDefinition(msCoreReferenceFinder.BoolTypeReference);
        method.Body.Variables.Add(boolVariable);

        var instructions = method.Body.Instructions;

        var last = Instruction.Create(OpCodes.Ret);
        instructions.Add(Instruction.Create(OpCodes.Ldarg_0));
        instructions.Add(Instruction.Create(OpCodes.Ldfld, propertyChangedField));
        instructions.Add(Instruction.Create(OpCodes.Stloc_0));
        instructions.Add(Instruction.Create(OpCodes.Ldloc_0));
        instructions.Add(Instruction.Create(OpCodes.Ldnull));
        instructions.Add(Instruction.Create(OpCodes.Ceq));
        instructions.Add(Instruction.Create(OpCodes.Stloc_1));
        instructions.Add(Instruction.Create(OpCodes.Ldloc_1));
        instructions.Add(Instruction.Create(OpCodes.Brtrue_S, last));
        instructions.Add(Instruction.Create(OpCodes.Ldloc_0));
        instructions.Add(Instruction.Create(OpCodes.Ldarg_0));
        instructions.Add(Instruction.Create(OpCodes.Ldarg_1));
        instructions.Add(Instruction.Create(OpCodes.Newobj, msCoreReferenceFinder.ComponentModelPropertyChangedEventConstructorReference));
        instructions.Add(Instruction.Create(OpCodes.Callvirt, msCoreReferenceFinder.ComponentModelPropertyChangedEventHandlerInvokeReference));

        instructions.Add(last);
        method.Body.InitLocals = true;
        targetType.Methods.Add(method);
        return method;
    }