Exclude property from getType().GetProperties()

Extension methods and attributes will help you:

public class SkipPropertyAttribute : Attribute
{
}

public static class TypeExtensions
{
    public static PropertyInfo[] GetFilteredProperties(this Type type)
    {
        return type.GetProperties().Where(pi => pi.GetCustomAttributes(typeof(SkipPropertyAttribute), true).Length == 0).ToArray();
    }       
}

public class Test
{
    public string One { get; set; }

    [SkipProperty]
    public string Two { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        var t = new Test();
        Type ty = t.GetType();

        PropertyInfo[] pinfo = ty.GetFilteredProperties();
        foreach (PropertyInfo p in pinfo)
        {
            Console.WriteLine(p.Name);
        }

        Console.ReadKey();
    }
}

UPDATE:

Little more elegant implementation of the GetFilteredProperties (thanks to Marc Gravell):

public static class TypeExtensions
{
    public static PropertyInfo[] GetFilteredProperties(this Type type)
    {
        return type.GetProperties()
              .Where(pi => !Attribute.IsDefined(pi, typeof(SkipPropertyAttribute)))
              .ToArray();
    }
}