Dictionary Keys (List<int>) Retreive in C#

Question

Hello.

Assumed I defined my dict as below.

Dictionary<list<int>, list<string>> d = new Dictionary<List<int>, list<string>>()

How can I retrieve the dict key and value rapidly.

[update]

I want to get the Key - List content. I tried a simple way as below

List<int> KeysList= new List<int>(d.Keys);

But it doesn't work at the complex key on my case.

Can I only use the KeyValuePair as below?

foreach (KeyValuePair<List<int>, List<string>> pair in d)
{
     KeysList= new List<int>(pair.Key);
}

Answer 1

You've got a potential problem there to start with: List<T> doesn't override Equals, so you'd have to use the exact same key reference to fetch the value for a key.

Having said that, if you have that reference, it's as simple as

List<string> value = d[key];

or

List<string> value;
if (d.TryGetValue(key, out value))
{
    ...
}

It's pretty unusual to have a List<T> as a key though - can you tell us more about what you're trying to do? There may be a better approach.