Implementing GetEnumerator

[ChewDoggie]

Hello All,

I have a Custom Class that is bound to several DataGridView controls elsewhere in my forms and is defined as follows:

namespace Collections.MyCollections
{
    [DataObject]
    public class clsGenericList : BindingList<clsGeneric>
    {
        public clsGenericList()
        {
        }

        //....other methods here

        public IEnumerator<clsGeneric> GetEnumerator()
        {
            return this.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return this.GetEnumerator();
        }
    }
}

But this code barfs on the GetEnumerator method. Does anyone know how to implement GetEnumerator for this type of class definition ?

Thanks !

Chew

10% of your life is what happens to you. 90% of your life is how you deal with it.

 

[jmeckley]

BindingList<T> already implements IEnumerator<clsGeneric>.GetEnumerator() so you should not need to implement it yourself.
IEnumerable.GetEnumerator() can either call this.GetEnumerator() or base.GetEnumerator()


Jason Meckley
Programmer

faq855-7190
faq732-7259

 

[ChewDoggie]

Thanks, Jason !

When I removed the methods for iterating over a collection, then it complained. It was probably b/c I was returning "this.GetEnumerator();" instead of "base.GetEnumerator();", as you pointed out.

In any event, I redefined clsGeneric to look like this:

    public class clsGenericList<T> : ICollection<T>
    {
        private int m_count = 0;
        private BindingList<T> ThisList = null;
        public clsGenericList()
        {
            ThisList = new BindingList<T>();
        }

        // Implementing ICollections methods here

        public IEnumerator<T> GetEnumerator()
        {
            return ThisList.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return ThisList.GetEnumerator();
        }
    }

And now all my collection classes inherit from this generic class:

    public class clsRegistrations : clsGenericList<clsRegistration>
    {
        #region Variables & Properties
        private int m_count = 0;
        private bool m_readonly = false;
        
        // Some custom methods here
    }

And all is hunky-dory again.

Thanks !

Chew

10% of your life is what happens to you. 90% of your life is how you deal with it.

 

[ChewDoggie]

....although it does seem to perform poorly (slow).

C.

10% of your life is what happens to you. 90% of your life is how you deal with it.