C# | Remove the first occurrence from the StringCollection

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.Remove(String) method is used to remove the first occurrence of a specific string from the StringCollection.

Syntax:

public void Remove (string value);

Here, value is the string which is to be removed from the StringCollection. The value can be null.

Note:

  • Duplicate strings are allowed in StringCollection.
  • Only the first occurrence is removed. To remove all occurrences of the specified string, use RemoveAt(IndexOf(value)) repeatedly while IndexOf does not return -1.
  • If the StringCollection does not contain the specified object, the StringCollection remains unchanged. No exception is thrown.
  • This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

Example:

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// C# code to remove the first
// occurrence of a specific string
// from 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", "A", "A", "B", "C",
                                           "C", "D", "D", "E"};
  
        // Copying the elements of a string
        // array to the end of the StringCollection.
        myCol.AddRange(myArr);
  
        Console.WriteLine("Elements in StringCollection are : ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
  
        // Removing the first occurrence of
        // "A" from the StringCollection
        myCol.Remove("A");
  
        Console.WriteLine("Elements in StringCollection are : ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
  
        // Removing the first occurrence of
        // "C" from the StringCollection
        myCol.Remove("C");
  
        Console.WriteLine("Elements in StringCollection are : ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
  
        // Removing the first occurrence of
        // "A" from the StringCollection
        myCol.Remove("A");
  
        Console.WriteLine("Elements in StringCollection are : ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
  
        // Removing the first occurrence of
        // "Z" from the StringCollection
        // It would not throw exception even
        // if "Z" does not exist in myCol
        myCol.Remove("Z");
  
        Console.WriteLine("Elements in StringCollection are : ");
  
        // Displaying elements in StringCollection
        // named myCol
        foreach(Object obj in myCol)
            Console.WriteLine(obj);
    }
}

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Output:

Elements in StringCollection are : 
A
A
A
B
C
C
D
D
E
Elements in StringCollection are : 
A
A
B
C
C
D
D
E
Elements in StringCollection are : 
A
A
B
C
D
D
E
Elements in StringCollection are : 
A
B
C
D
D
E
Elements in StringCollection are : 
A
B
C
D
D
E

Reference:



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