在字典中添加项目打破了foreach循环

Question

I'm trying to loop through a collection of items and add their properties to a Dictionary, though for some reason its not finishing the loop.

My code:

Dictionary<string, Tuple<string, string>> elementList = new Dictionary<string, Tuple<string, string>>(); 
public void AddElementList(AutomationElementCollection collection)
{

    foreach (AutomationElement ele in collection)
    {
        elementList.Add(ele.Cached.Name, new Tuple<string, string>(ele.Cached.LocalizedControlType.ToString(), ele.Cached.AutomationId.ToString()));
        i++;

    }
    MessageBox.Show(i.ToString());
}    

Its not getting to the MessageBox.Show at all. There is usually around 52 items, it loops through 8 then quits.

Answer 1

You say that it goes through 8 times then stops. It may be the case that when you call Add on the dictionary that it throws an ArgumentException because An element with the same key already exists in the Dictionary.

This happens because when you go to look up a value in a dictionary, that it looks for that key, of cause if there were two of the same key, you wouldn't know which value to return.