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

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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, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.