Using LINQ to select Only Strings from an ArrayList

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, 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.

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