StringCollection class is a new addition to the .NET Framework class library that represents a collection of strings. StringCollection class is defined in the System.Collections.Specialized namespace.
StringCollection.Contains(String) method is used to check whether the specified string is in the StringCollection or not.
Syntax:
public bool Contains (string value);
Here, value is the string to locate in the StringCollection. The value can be null.
Return Value: This method returns true if value is found in the StringCollection, otherwise it returns false.
Note:
- The Contains method can confirm the existence of a string before performing further operations.
- This method performs a linear search, therefore, this method is an O(n) operation, where n is Count.
Below programs illustrate the use of StringCollection.Contains(String) Method:
Example 1 :
// C# code to check if the specified // string is in the StringCollection using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// creating a StringCollection named myCol
StringCollection myCol = new StringCollection();
// creating a string array named myArr
String[] myArr = new String[] { "A" , "B" , "C" , "D" , "E" };
// Copying the elements of a string
// array to the end of the StringCollection.
myCol.AddRange(myArr);
// checking if StringCollection
// Contains "A"
Console.WriteLine(myCol.Contains( "A" ));
}
} |
True
Example 2:
// C# code to check if the specified // string is in the StringCollection using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// creating a StringCollection named myCol
StringCollection myCol = new StringCollection();
// creating a string array named myArr
String[] myArr = new String[] { "2" , "3" , "4" , "5" , "6" };
// Copying the elements of a string
// array to the end of the StringCollection.
myCol.AddRange(myArr);
// checking if StringCollection
// Contains "8"
Console.WriteLine(myCol.Contains( "8" ));
}
} |
False
Reference: