C# | Remove the first occurrence from the StringCollection (original) (raw)
Last Updated : 01 Feb, 2019
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:
CSHARP `
// 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);
}
}
`
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: