C# - Investigating "Method' information using Reflection ?

Question

My intention is to investigate the "Methods" of a Type using reflection in order to verify the following :

1. The Methods should be instance methods and public.

2. Takes the parameter "params" and void in nature.

3. The Method does not makes recursive call.

I started as :

static void ProcessMethodInfo(Type t)
    {
        MethodInfo[] info = t.GetMethods();

        foreach (MethodInfo mi in info)
        {

          // How to check the conditions here ?  

        }
    }

But I don't know how to proceed further. Help is needed.

Answer 1

I don't think you'll be able to detect item 3 using reflection.

Answer 2

Well, if by 3 you mean the method under inspection should be non-recursive; then that is a pain - you'd need to parse the IL. But for the others;

    Type type = ...
    var qry = from method in type.GetMethods(
                  BindingFlags.Instance | BindingFlags.Public)
              where method.ReturnType == typeof(void)
              let parameters = method.GetParameters()
              where parameters.Length == 1
              && parameters[0].ParameterType.IsArray
              && Attribute.IsDefined(parameters[0], typeof(ParamArrayAttribute))
              select method;
    foreach (var method in qry)
    {
        Console.WriteLine(method.Name);
    }

Answer 3

1. mi.IsStatic, etc - read help
2. http://stackoverflow.com/questions/627656/determining-if-a-parameter-uses-params-using-reflection-in-c
3. http://www.codeproject.com/KB/cs/sdilreader.aspx

ALL: use google ;)

Answer 4

Check the following members of the MethodInfo class:

• IsPublic
• IsStatic
• ReturnType
• GetParameters() method

In order to be able to check whether the method is recursive, I think you'll need something more then just simple reflection.