Using LINQ to select Only Strings from an ArrayList

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Here’s a simple example of using LINQ to select only Strings from an ArrayList that contains both integers and strings.

C#

static void Main(string[] args)
{
    ArrayList al = new ArrayList { "Hello", 200, "World", false, 100 };
    var onlyStr = al.OfType<string>();
    Console.WriteLine("Printing Only Strings");               
    foreach(var str in onlyStr)
             Console.WriteLine(str);          
    Console.ReadLine();
}

VB.NET

Sub Main(ByVal args() As String)
Dim al As ArrayList = New ArrayList From {"Hello", 200, "Word", False, 100}
    Dim onlyStr = al.OfType(Of String)()
    Console.WriteLine("Printing Only Strings")
    For Each str In onlyStr
             Console.WriteLine(str)
    Next str
    Console.ReadLine()
End Sub

As you can see, we are using the Enumerable.OfType<TResult> Method which filters the elements of an IEnumerable based on a specified type, in our case the String type.

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.