.NET 4.0 New Feature - String.IsNullOrWhiteSpace

November 22, 2010

namespace ConsoleApplication1 { class Program { static void Main(string[] args) { string[] values = { null, String.Empty, “ABCDE”, new String(’ ‘, 20), " “, new String(’\u2000’, 10), };

        Console.WriteLine(new String('=', 50));
        Console.WriteLine("IsNullOrWhiteSpaceDemo...");
        IsNullOrWhiteSpaceDemo(values);

        Console.WriteLine(new String('=', 50));
        Console.WriteLine("MSDNCustomIsNullOrWhiteSpaceDemo...");
        MSDNCustomIsNullOrWhiteSpaceDemo(values);

        Console.WriteLine(new String('=', 50));
        Console.WriteLine("CustomIsNullOrWhiteSpaceDemo...");
        CustomIsNullOrWhiteSpaceDemo(values);
    }
    public static void IsNullOrWhiteSpaceDemo(string[] values)
    {
        foreach (string value in values)
            Console.WriteLine("String.IsNullOrWhiteSpace({0}): {1}", value, String.IsNullOrWhiteSpace(value));
    }

    public static void MSDNCustomIsNullOrWhiteSpaceDemo(string[] values)
    {
        foreach (string value in values)
            Console.WriteLine("MSDNCustomIsNullOrWhiteSpace({0}): {1}", value, MSDNCustomIsNullOrWhiteSpace(value));
    }

    public static bool MSDNCustomIsNullOrWhiteSpace(string value)
    {
        return String.IsNullOrEmpty(value) || value.Trim().Length == 0;
    }

    public static void CustomIsNullOrWhiteSpaceDemo(string[] values)
    {
        foreach (string value in values)
            Console.WriteLine("CustomIsNullOrWhiteSpace({0}): {1}", value, CustomIsNullOrWhiteSpace(value));
    }

    public static bool CustomIsNullOrWhiteSpace(string value)
    {
        return value == null || value.Trim().Length == 0;
    }
}

}

CSharp