Determine whether a type is simple.

TypeExtensions.IsSimpleType.cs

public static class TypeExtensions
{
	/// <summary>
	/// Determine whether a type is simple (String, Decimal, DateTime, etc) 
	/// or complex (i.e. custom class with public properties and methods).
	/// </summary>
	/// <see cref="http://stackoverflow.com/questions/2442534/how-to-test-if-type-is-primitive"/>
	public static bool IsSimpleType(
		this Type type)
	{
		return
			type.IsValueType ||
			type.IsPrimitive ||
			new Type[] { 
				typeof(String),
				typeof(Decimal),
				typeof(DateTime),
				typeof(DateTimeOffset),
				typeof(TimeSpan),
				typeof(Guid)
			}.Contains(type) ||
			Convert.GetTypeCode(type) != TypeCode.Object;
	}
}