Using MEF in a Windows Store App: Listing 1

ValidateEmail class.

using System.Composition;
using System.Text.RegularExpressions;

namespace BusinessRules
{
    [Export(typeof(IValidate))]
    [ExportMetadata("Name", "Email")]
    public class ValidateEmail : IValidate
    {
        const string EMAIL_PATTERN = @"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$";

        public string Validate(string input)
        {
            if (Regex.IsMatch(input, EMAIL_PATTERN))
            {
                return "Email is valid.";
            }
            else
            {
                return "Email is not valid.";
            }
        }
    }
}

About the Author

Eric Vogel is a Sr. Software Developer at Kunz, Leigh, & Associates in Okemos, MI. He is the president of the Greater Lansing User Group for .NET. Eric enjoys learning about software architecture and craftsmanship, and is always looking for ways to create more robust and testable applications. Contact him at vogelvision@gmail.com.