Can I use PrivateObject class or Reflection to access a field in a private class?

If i have a private class

Class A
{
    public static strin开发者_开发问答g foo;
}

Can i use reflection to access that static field? Assuming of course i cannot change the code...

The problem i have is that the Class is defined in a different Namespace than i am in.

lets say I am in the Test namespace, and i have a reference to a DLL with the FOO namespace.

   namespace FOO
   {
     Class A
     {
         public static string bar;
     }
   }

I want to access the bar field in the class A from namespace TEST.

Yes, you can. You'll need to get the Type - how you do that will depend on the exact nature of your app; Assembly.GetType(string) would be one option, for example. After that, you get the FieldInfo with Type.GetField and then ask the field for its value, using null as the target as it's a static field.

What finally worked for me was the Assembly approach:

assembly = typeof(Class B).Assembly; //Class B is in the same namespace as A
Type type = assembly.GetType("FOO.A");
string val = (string) type.GetField("bar",
    BindingFlags.Public | BindingFlags.Static).GetValue(null);

this is intentionally verbose so you'll get what is happening step by step. It checks all the fields in type A and looks for one named "foo".

EDIT: it works for A in a different namespace too.

namespace DifferentNamespace
{
    class A
    {
        public static string foo = "hello";
    }
}

class Program {
    static void Main(string[] args) {
        Type type = typeof(DifferentNamespace.A);
        FieldInfo[] fields = type.GetFields();
        foreach (var field in fields)
        {
            string name = field.Name;
            object temp = field.GetValue(null); // Get value
                                                // since the field is static 
                                                // the argument is ignored
                                                // so we can as well pass a null                
            if (name == "foo") // See if it is named "foo"
            {
                string value = temp as string;
                Console.Write("string {0} = {1}", name, value);
            }
            Console.ReadLine();
        }
    }
}

Try

object value = typeof (Program).GetFields(BindingFlags.Static | BindingFlags.Public)
    .Where(x => x.Name == "foo").FirstOrDefault()
    .GetValue(null);