Filter a Type in .NET inside the For-Each Loop

Here’s a nice way to filter an ArrayList right inside the For-Each Loop. We have to filter and print only ‘integers’ greater than 10.

static void Main(string[] args)
{
    ArrayList arr = new ArrayList();
    arr.Add(15);
    arr.Add(25.35);
    arr.Add(10);
    arr.Add(20);
    arr.Add(25);
    arr.Add(20.2);

    foreach (var num in arr.OfType<int>().Where(x => x > 10))
    {
        Console.WriteLine(num);
    }

    Console.ReadLine();
}

As you can observe, we are using the Enumerable.OfType<TResult> inside the foreach loop to filter only those elements of the ArrayList which are integers and greater than 10. This code will only work in .NET 3.5 and above.

OUTPUT

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal