C# | Index of first occurrence in StringCollection

C# | Check if the StringCollection is read-only

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.IsReadOnly property is used to get a value indicating whether the StringCollection is read-only or not.

Syntax:

public bool IsReadOnly { get; }

Return Value: This property always returns false.

Note:

A collection that is read-only does not allow the addition, removal, or modification of elements after the collection is created.
Retrieving the value of this property is an O(1) operation.

Example:

// C# code to check if the 
// StringCollection is read-only 
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 is 
        // read-only 
        Console.WriteLine(myCol.IsReadOnly); 
    } 
} 

Output:

False

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.stringcollection.isreadonly?view=netframework-4.7.2

C# | Index of first occurrence in StringCollection

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