Question

I would like to know how to Store Key/Value Pair in C# 4.0?

For example, in Java HashTable or HashMap used to store key/value pairs.. But How i do it in C#?

Answer 1

You can use the Hashtable class, or a Dictionary<TKey, TValue> if you know the specific types that you’re storing.

Example:

// Loose-Type
Hashtable hashTable = new Hashtable();
hashTable.Add("key", "value");
hashTable.Add("int value", 2);
// ...
foreach (DictionaryEntry dictionaryEntry in hashTable) {
    Console.WriteLine("{0} -> {1}", dictionaryEntry.Key, dictionaryEntry.Value);
}

// Strong-Type
Dictionary<string, int> intMap = new Dictionary<string, int>();
intMap.Add("One", 1);
intMap.Add("Two", 2);
// ..
foreach (KeyValuePair<string, int> keyValue in intMap) {
    Console.WriteLine("{0} -> {1}", keyValue.Key, keyValue.Value);
}