Type.GetFields Method (BindingFlags)

George_George

Hello everyone, From MSDN about Type.GetFields Method (BindingFlags), http://msdn.microsoft.com/en-us/library/6ztex2dc(VS.80).aspx What means "When overridden in a derived class, searches for the fields defined for the current Type"? I can not find related description for this point in the MSDN related sample. Especially "overridden in a derived class" and "defined for the current Type"? thanks in advance, George

S Senthil Kumar

George_George wrote:

What means "When overridden in a derived class, searches for the fields defined for the current Type"?

System.Type is an abstract class, and GetFields is an abstract method. There are several classes that derived from Type, and MSDN says that when it is overridden in a derived class, it must return the fields associated with the "underlying" type that the Type object represents.

Regards Senthil [MVP - Visual C#] _____________________________ My Blog | My Articles | My Flickr | WinMacro

George_George

Thanks Senthil, I have written a test case, I am using a base class type variable to point to a derived type and in the derived type, I override a method of base class. But it seems I can get nothing in variable fields. Any ideas?

class Program
{
    class Foo
    {
        public static int abc;
        virtual public void bcd()
        {

        }
    }

    class Goo : Foo
    {
        override public void bcd()
        {

        }
    }

    static void Main(string\[\] args)
    {
        Foo f = new Goo();
        FieldInfo\[\] fields = f.GetType().GetFields(BindingFlags.Instance | BindingFlags.Public);

        return;
    }
}

regards, George

S Senthil Kumar

George_George wrote:

But it seems I can get nothing in variable fields. Any ideas?

The text in the MSDN page is for people deriving from System.Type, for whatever reason. From a user's perspective, it returns the list of fields in the class represented by the Type.

Regards Senthil [MVP - Visual C#] _____________________________ My Blog | My Articles | My Flickr | WinMacro

George_George

Thanks Senthil, The fields only for member variables, not for functions? regards, George

Vega02

The field abc is defined as static, but in your GetFields() call you ask it to return only instance fields.

S Senthil Kumar

GetFields returns only fields (member variables) in that type. Type.GetMethods[^] returns functions defined in that Type.

Regards Senthil [MVP - Visual C#] _____________________________ My Blog | My Articles | My Flickr | WinMacro

leppie

Call GetMembers then.

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leppie

S. Senthil Kumar wrote:

for whatever reason.

Every single type defined derives from Type as a RuntimeType.

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George_George

For any user defined class, does the class implicitly derives from Type? regards, George

George_George

I have tested it, leppie! Looks like GetMembers is more powerful than GetFields. :-) regards, George

George_George

Thanks Senthil, Looks like GetMembers return both methods and fields, and GetMethods/GetFields returns just method/field? So, GetMembers is more powerful. :-) regards, George

George_George

Thanks Vega02, I think the root cause is, I do not know GetFields will not return methods before. :-) regards, George