How do I get the list of keys in a Dictionary?

I only want the Keys and not the Values of a Dictionary.

I haven't been able to get any code to do this yet. Using another array proved to be too much work as I use remove also.

**How do I get a List of the Keys in a Dictionary?**

You should be able to just look at `.Keys`:

Dictionary<string, int> data = new Dictionary<string, int>();
data.Add("abc", 123);
data.Add("def", 456);
foreach (string key in data.Keys)
{
Console.WriteLine(key);
}

Marc Gravell's answer should work for you. `myDictionary.Keys` returns an object that implements `ICollection<TKey>`, `IEnumerable<TKey>` and their non-generic counterparts.

I just wanted to add that if you plan on accessing the value as well, you could loop through the dictionary like this (modified example):

Dictionary<string, int> data = new Dictionary<string, int>();
data.Add("abc", 123);
data.Add("def", 456);

foreach (KeyValuePair<string, int> item in data)
{
Console.WriteLine(item.Key + ": " + item.Value);
}

The question is a little tricky to understand but I'm guessing that the problem is that you're trying to remove elements from the Dictionary while you iterate over the keys. I think in that case you have no choice but to use a second array.

ArrayList lList = new ArrayList(lDict.Keys);
foreach (object lKey in lList)
{
if (<your condition here>)
{
lDict.Remove(lKey);
}
}
If you can use generic lists and dictionaries instead of an ArrayList then I would, however the above should just work.

Or like this:

List< KeyValuePair< string, int > > theList =
new List< KeyValuePair< string,int > >(this.yourDictionary);

for ( int i = 0; i < theList.Count; i++)
{
// the key
Console.WriteLine(theList[i].Key);
}

For a hybrid dictionary, I use this:

List<string> keys = new List<string>(dictionary.Count);
keys.AddRange(dictionary.Keys.Cast<string>());