In this source code example, we will demonstrate how to use the FindAll method of List in C#.

The FindAll method retrieves all the elements of a list that match the conditions defined by the specified predicate. It returns a list containing all the elements that match the conditions defined by the specified predicate is found; otherwise, an empty list.

C# List FindAll example

The following example finds all positive elements:

using System;
using System.Collections.Generic;

public class ListDemo
{
    public static void Main(string[] args)
    {
        var vals = new List<int> {-1, -3, 0, 1, 3, 2, 9, -4};

        List<int> filtered = vals.FindAll(e => e > 0);
        
        foreach(int e in filtered) {
        
            Console.WriteLine(e);
        }
        
    }
}

Output:

1
3
2
9

Related C# List Examples

1. C# List add elements example
2. C# List insert elements example
3. C# List Contains example
4. C# List removing elements example
5. C# List ToArray example
6. C# List ForEach example
7. C# loop List example
8. C# List FindAll example
9. C# List Find, FindLast, FindIndex, FindLastIndex
10. C# List ConvertAll example