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C# Equivalent to Java HashMap

The nearly exact C# (or VB) equivalent to Java's HashMap collection is the .NET System.Collections.Generic.Dictionary collection.

Original Java:

void HashMaps()
   java.util.HashMap<String, Integer> myDictionary = new java.util.HashMap<String, Integer>();
   String s = "test";
   myDictionary.put(s, 1);
   int i = myDictionary.get(s);
   i = myDictionary.size();
   boolean b = myDictionary.isEmpty();

Equivalent C#:

using System.Collections.Generic;

void HashMaps()
   Dictionary<string, int?> myDictionary = new Dictionary<string, int?>();
   string s = "test";
   myDictionary[s] = 1;
   int i = myDictionary[s].Value;
   i = myDictionary.Count;
   bool b = myDictionary.Count == 0;

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