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

image



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About The Author

Suprotim Agarwal
Suprotim Agarwal, ASP.NET Architecture MVP (Microsoft Most Valuable Professional) 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 is the Editor of a Developer Magazine called DNC Magazine. He has also written two EBooks 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook

Follow him on twitter @suprotimagarwal

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