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Get a collection of keys in the StringDictionary in C#
To get a collection of keys in the StringDictionary, the code is as follows −
Example
using System; using System.Collections; using System.Collections.Specialized; public class Demo { public static void Main(){ StringDictionary strDict1 = new StringDictionary(); strDict1.Add("U", "Electronics"); strDict1.Add("V", "Toys"); strDict1.Add("W", "Books"); strDict1.Add("X", "Accessories"); Console.WriteLine("StringDictionary1 elements..."); foreach(DictionaryEntry d in strDict1){ Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Does StringDictionary1 has key G? "+strDict1.ContainsKey("G")); StringDictionary strDict2 = new StringDictionary(); strDict2.Add("A", "John"); strDict2.Add("B", "Andy"); strDict2.Add("C", "Tim"); strDict2.Add("D", "Ryan"); strDict2.Add("E", "Kevin"); strDict2.Add("F", "Katie"); strDict2.Add("G", "Brad"); Console.WriteLine("
StringDictionary2 elements..."); foreach(DictionaryEntry d in strDict2){ Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("
Collection of keys (StringDictionary2)..."); String[] keyArr = new String[strDict2.Count]; strDict2.Keys.CopyTo(keyArr, 0); for (int i = 0; i < strDict2.Count; i++) { Console.WriteLine("Key "+(i+1)+" = "+keyArr[i]); } Console.WriteLine("
Is Dictionary2 equal to Dictionary1? = "+strDict2.Equals(strDict1)); Console.WriteLine("Does StringDictionary2 has key B? "+strDict2.ContainsKey("B")); } }
Output
This will produce the following output −
StringDictionary1 elements... x Accessories u Electronics v Toys w Books Does StringDictionary1 has key G? False StringDictionary2 elements... a John b Andy c Tim d Ryan e Kevin f Katie g Brad Collection of keys (StringDictionary2)... Key 1 = a Key 2 = b Key 3 = c Key 4 = d Key 5 = e Key 6 = f Key 7 = g Is Dictionary2 equal to Dictionary1? = False Does StringDictionary2 has key B? True
Example
Let us see another example −
using System; using System.Collections; using System.Collections.Specialized; public class Demo { public static void Main(){ StringDictionary strDict1 = new StringDictionary(); strDict1.Add("S", "Home Appliances"); strDict1.Add("T", "Smart Wearable Tech"); strDict1.Add("U", "Electronics"); strDict1.Add("V", "Toys"); strDict1.Add("W", "Books"); strDict1.Add("X", "Accessories"); Console.WriteLine("StringDictionary elements..."); foreach(DictionaryEntry d in strDict1){ Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("
Collection of keys and values..."); String[] keyArr = new String[strDict1.Count]; strDict1.Keys.CopyTo(keyArr, 0); for (int i = 0; i < strDict1.Count; i++) { Console.WriteLine("Key "+(i+1)+" = "+keyArr[i]+", Value "+(i+1)+" = "+strDict1[keyArr[i]]); } Console.WriteLine("
Does StringDictionary has key B? "+strDict1.ContainsKey("B")); } }
Output
This will produce the following output −
StringDictionary elements... x Accessories s Home Appliances t Smart Wearable Tech u Electronics v Toys w Books Collection of keys and values... Key 1 = x, Value 1 = Accessories Key 2 = s, Value 2 = Home Appliances Key 3 = t, Value 3 = Smart Wearable Tech Key 4 = u, Value 4 = Electronics Key 5 = v, Value 5 = Toys Key 6 = w, Value 6 = Books Does StringDictionary has key B? False
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