NullReferenceException when using MyListProperty.Add?

Question

 public List<string> myitems { get; set; }
    //Store All unique ID of this date in a list
    public void myitem(string Index)
    {
        myitems.Add(Index);
    }

  if (temp.Start == received)
            {

                scheduledItem scheduleditem = new scheduledItem(temp.Name, "1pm", "true");
                DataCollection.Add(scheduleditem);
                myitem(temp.UniqueID.ToString()); 
            }
            else
            {
                MessageBox.Show("Nothing");

            }

Any idea what went wrong with myitems.add(index); ?

Where is the new List<string>? It would explain the null ("lack of object").. — user166390
– user166390, Commented Jun 24, 2012 at 5:49

KV Prajapati · Accepted Answer · 2012-06-24 05:56:08Z

3

You have to instantiate/initialize the List<T>.

 private List<string> _list = new List<string>();

 public List<string> myitems 
 { 
     get { return _list; }
 }

edited Jun 24, 2012 at 5:56

answered Jun 24, 2012 at 5:49

KV Prajapati

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Comments

Marty · Accepted Answer · 2012-06-24 05:49:27Z

2

You haven't actually initialized myitems. You need add this line of code somewhere, such as the constructor of your class

myitems = new List<string>();

answered Jun 24, 2012 at 5:49

Marty

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1 Comment

JohnDotOwl Over a year ago

OH! Okay , i'm starting to get the meaning of Initialize Thanks!

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