Threadin issue

[s2001]

Hello All,

I am having problem sharing information between two threads.

-- Thread 1 -- Reads value (calls ReadVal) from the Hashtable.
-- Thread 2 -- Adds value (calls Add) to the Hashtable.

What is happening is when i read the value, i get the exception :

Collection was modified; enumeration operation may not execute.

Any help would be greatly appreciated.

Class Hashes:

public static string ReadVal()
        {
            string str = string.Empty; 
            //lock (locker)
            //{
               
                
                IDictionaryEnumerator en = t.GetEnumerator();
                //***Get the error here. ****
                while (en.MoveNext())
                {
                    str = en.Value.ToString();
                    t.Remove(en.Key);
                }
            //}
            return str;
        }

        public static void Add(int val)
        {
            lock (locker)
            {
                try
                {
                    t.Add("Hello:" + val, val);
                }
                catch (Exception)
                {
                    int num = rc.Next();
                    t.Add("Hello:" + num, val);
                }
            }
        }

Thanks,
Murali Bala

http://www.itmodule.com

 

[JurkMonkey]

You can't modify a collection (hashtable, list, dictionary, etc) while in the middle of a loop.

Thread 1 must lock the hashtable for use exclusively and Thread 2 can add to the list when it's done.

do some googling for C# Lock

http://www.ubuntu.com/

 

[s2001]

Thanks. Will do

Thanks,
Murali Bala

http://www.itmodule.com