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Check if OrderedDictionary collection contains a specific key in C#
To check if OrderedDictionary collection contains a specific key, the code is as follows −
Example
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main(){
OrderedDictionary dict = new OrderedDictionary();
dict.Add("1", "One");
dict.Add("2", "Two");
dict.Add("3", "Three");
dict.Add("4", "Four");
dict.Add("5", "Five");
dict.Add("6", "Six");
dict.Add("7", "Seven");
dict.Add("8", "Eight");
ICollection col = dict.Values;
String[] strVal = new String[dict.Count];
col.CopyTo(strVal, 0);
Console.WriteLine("Displaying the values...");
for (int i = 0; i < dict.Count; i++) {
Console.WriteLine(strVal[i]);
}
Console.WriteLine("If OrderedDictionary read-only? = "+dict.IsReadOnly);
Console.WriteLine("The OrderedDictionary has the key 15? = "+dict.Contains("15"));
Console.WriteLine("The OrderedDictionary has the key 5? = "+dict.Contains("5"));
}
}Output
This will produce the following output −
Displaying the values... One Two Three Four Five Six Seven Eight If OrderedDictionary read-only? = False The OrderedDictionary has the key 15? = False The OrderedDictionary has the key 5? = True
Example
Let us see another example −
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main(){
OrderedDictionary dict = new OrderedDictionary();
dict.Add("A", "Pen");
dict.Add("B", "Pencil");
dict.Add("C", "Notebook");
dict.Add("D", "Table");
dict.Add("E", "Chair");
dict.Add("F", "Coworking");
dict.Add("G", "Cubicle");
dict.Add("H", "Sticky Notes");
dict.Add("I", "WhiteBoard");
dict.Add("J", "Marker");
ICollection col = dict.Values;
String[] strVal = new String[dict.Count];
col.CopyTo(strVal, 0);
Console.WriteLine("Displaying the values...");
for (int i = 0; i < dict.Count; i++) {
Console.WriteLine(strVal[i]);
}
Console.WriteLine("If OrderedDictionary read-only? = "+dict.IsReadOnly);
Console.WriteLine("The OrderedDictionary has the key B? = "+dict.Contains("B"));
}
}Output
This will produce the following output −
Displaying the values... Pen Pencil Notebook Table Chair Coworking Cubicle Sticky Notes WhiteBoard Marker If OrderedDictionary read-only? = False The OrderedDictionary has the key B? = True
Updated on: 10-Dec-2019
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