Retrieve all method names

Question

i am trying to get all of my methods in all the classes with reflection. I Here is my code. I can get the class names, but i cant get the method names. How can i do that?

string @namespace = "Application.Main";

List<String> methodNames = new List<string>();
List<String> appServiceClasses = new List<string>();
List<Type> returnVal = AppDomain.CurrentDomain
                                .GetAssemblies()
                                .SelectMany(t => t.GetTypes())
                                .Where(t => t.IsClass && t.Namespace == @namespace).ToList();

for (int i = 0; i < returnVal.Count; i++)
{
    appServiceClasses.Add(returnVal[i].Name);
}

Type myTypeObj = typeof(appServiceClasses[0]);
MethodInfo[] methodInfos = myTypeObj.GetMethods();

foreach (MethodInfo methodInfo in methodInfos)
{
    string a = methodInfo.Name;
}

Answer 1

Well, you already have the type of your classes, why you are getting name of them ? I mean what is the purpose of doing that? you can use those type instances to get your methods.

var methods = returnVal.SelectMany(x => x.GetMethods());

Edit: you can also use a Dictionary<string, MethodInfo[]> so you can access the method so of a class with it's name like:

var methods = returnVal.ToDictionary(x => x.Name, x => x.GetMethods());

var methodsOfFoo = methods["Foo"];

Answer 2

Use the type to ask for methods:

for (int i = 0; i < returnVal.Count; i++)
{
  appServiceClasses.Add(returnVal[i].Name);
  MethodInfo[] methodInfos = returnVal[i].GetMethods();

  foreach (MethodInfo methodInfo in methodInfos)
  {
    string a = methodInfo.Name;
  }
}

Answer 3

You don't need to store the type name and then use typeof. You already have the type:-

var appServiceClassTypes = AppDomain.CurrentDomain.GetAssemblies()
                                    .SelectMany(x => x.GetTypes())
                                    .Where(x => x.IsClass && x.Namespace == ...)
                                    .ToList();

var appServiceClasses = appServiceClassTypes.Select(x => x.Name);

var methodNames = appServiceClassTypes.SelectMany(x => x.GetMethods())
                                      .Select(x => x.Name)
                                      .ToList();

If you don't actually need the appServiceClasses collection anywhere, you should just be able to chain those together:-

var methodNames = AppDomain.CurrentDomain.GetAssemblies()
                           .SelectMany(x => x.GetTypes())
                           .Where(x => x.IsClass && x.Namespace == ...)
                           .SelectMany(x => x.GetMethods())
                           .Select(x => x.Name)
                           .ToList();

You probably want to know which methods belong to which class, though:-

var methods = AppDomain.CurrentDomain.GetAssemblies()
                       .SelectMany(x => x.GetTypes())
                       .Where(x => x.IsClass && x.Namespace == ...)
                       .Select(x => new Tuple<string, IEnumerable<string>>(
                           x.Name,
                           x.GetMethods().Select(y => y.Name)));

or:-

var methods = AppDomain.CurrentDomain.GetAssemblies()
                       .SelectMany(x => x.GetTypes())
                       .Where(x => x.IsClass && x.Namespace == ...)
                       .ToDictionary(
                           x => x.Name,
                           x => x.GetMethods().Select(y => y.Name));