C# / .NET - iterate over List and remove indicated items

In this article, we would like to show you how to iterate over List and remove indicated items in C#.

Quick solution:

List<string> myList = new List<string> { "A", "B", "C" };

for (int i = myList.Count - 1; i >= 0; i--)
    if (myList[i] == "B")
        myList.RemoveAt(i);

or:

List<string> myList = new List<string> { "A", "B", "C" };

myList.RemoveAll(item => item == "B");

1. Practical example using for loop with RemoveAt() method

In this example, we use RemoveAt() method to remove indicated items by index when the value matches the criteria.

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<string> myList = new List<string> { "A", "B", "C" };

        for (int i = myList.Count - 1; i >= 0; i--)
        {
            if (myList[i] == "B")
                myList.RemoveAt(i);
        }

        // Print results
        foreach (string item in myList)
            Console.WriteLine(item);
    }
}

Output:

A
C

2. Using RemoveAll() method

In this example, we use RemoveAll() method to remove indicated items when they match the criteria.

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        List<string> myList = new List<string> { "A", "B", "C" };

        myList.RemoveAll(item => item == "B");

        // Print results
        foreach (string item in myList)
            Console.WriteLine(item);
    }
}

Output:

A
C

References

1. List<T>.RemoveAt(Int32) Method (System.Collections.Generic) | Microsoft Docs