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StringDictionary Class in C#?
The StringDictionay class implements a hash table with the key and the value strongly typed to be strings rather than objects.
Following are the properties of the StringDictionary class −
Sr.No | Property & Description |
---|---|
1 | Count Gets the number of key/value pairs in the StringDictionary. |
2 | IsSynchronized Gets a value indicating whether access to the StringDictionary is synchronized (thread safe). |
3 | tem[String] Gets or sets the value associated with the specified key. |
4 | Keys Gets a collection of keys in the StringDictionary.. |
5 | SyncRoot Gets an object that can be used to synchronize access to the StringDictionary. |
6 | Values Gets a collection of values in the StringDictionary. |
Following are some of the methods of the StringDictionary class −
Sr.No | Methods & Description |
---|---|
1 | Add(String, String) Adds an entry with the specified key and value into the StringDictionary. |
2 | Clear() Removes all entries from the StringDictionary. |
3 | ContainsKey(String) Determines if the StringDictionary contains a specific |
4 | ContainsValue(String) Determines if the StringDictionary contains a specific value. |
5 | CopyTo(Array, Int32) Copies the string dictionary values to a onedimensional Array instance at the specified index. |
6 | Equals(Object) Determines whether the specified object is equal to the current object.(Inherited from Object) |
Example
Let us now see some examples −
To check if two StringDictionary objects are equal or not, the code is as follows −
using System; using System.Collections.Specialized; public class Demo { public static void Main() { StringDictionary strDict1 = new StringDictionary(); strDict1.Add("A", "John"); strDict1.Add("B", "Andy"); strDict1.Add("C", "Tim"); strDict1.Add("D", "Ryan"); strDict1.Add("E", "Kevin"); strDict1.Add("F", "Katie"); strDict1.Add("G", "Brad"); 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"); StringDictionary strDict3 = new StringDictionary(); strDict3 = strDict2; Console.WriteLine("Is Dictionary2 equal to Dictionary3? = "+strDict2.Equals(strDict3)); Console.WriteLine("Is Dictionary1 equal to Dictionary3? = "+strDict1.Equals(strDict3)); } }
Output
This will produce the following output −
Is Dictionary2 equal to Dictionary3? = True Is Dictionary1 equal to Dictionary3? = False
Example
To check if StringDictionary is synchronized, the code is as follows −
using System; using System.Collections; using System.Collections.Specialized; public class Demo { public static void Main() { StringDictionary strDict1 = new StringDictionary(); strDict1.Add("A", "John"); strDict1.Add("B", "Andy"); strDict1.Add("C", "Tim"); strDict1.Add("D", "Ryan"); strDict1.Add("E", "Kevin"); strDict1.Add("F", "Katie"); strDict1.Add("G", "Brad"); Console.WriteLine("StringDictionary1 elements..."); foreach(DictionaryEntry de in strDict1) { Console.WriteLine(de.Key + " " + de.Value); } StringDictionary strDict2 = new StringDictionary(); strDict2.Add("1", "A"); strDict2.Add("2", "B"); strDict2.Add("3", "C"); strDict2.Add("4", "D"); strDict2.Add("5", "E"); Console.WriteLine("
StringDictionary2 key-value pairs..."); IEnumerator demoEnum = strDict2.GetEnumerator(); DictionaryEntry d; while (demoEnum.MoveNext()) { d = (DictionaryEntry)demoEnum.Current; Console.WriteLine("Key = " + d.Key + ", Value = " + d.Value); } Console.WriteLine("Is the StringDictionary2 synchronized? = "+strDict2.IsSynchronized); } }
Output
This will produce the following output −
StringDictionary1 elements... a John b Andy c Tim d Ryan e Kevin f Katie g Brad StringDictionary2 key-value pairs... Key = 1, Value = A Key = 2, Value = B Key = 3, Value = C Key = 4, Value = D Key = 5, Value = E Is the StringDictionary2 synchronized? = False
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