Detecting anonymous types on Mono

Extensions.cs

using System;
using System.Reflection;
using System.Runtime.CompilerServices;

/// <summary>
/// Contains miscellaneous extension methods. 
/// </summary>
public static class Extensions
{
    /// <summary>
    /// Checks if the evaluated instance is an anonymous 
    /// </summary>
    /// <param name="source">The object instance to check.</param>
    /// <returns><see langword="true"/> if the object is an anonymous type; otherwise <see langword="false"/>.</returns>
    public static bool IsAnonymousType(this object source)
    {
        if (source == null)
        {
            return false;
        }
		
        var type = source.GetType();
					
        return type.IsGenericType 
               && (type.Attributes & TypeAttributes.NotPublic) == TypeAttributes.NotPublic
               && (type.Name.StartsWith("<>", StringComparison.OrdinalIgnoreCase) || type.Name.StartsWith("VB$", StringComparison.OrdinalIgnoreCase))
               && (type.Name.Contains("AnonymousType") || type.Name.Contains("AnonType"))
               && Attribute.IsDefined(type, typeof (CompilerGeneratedAttribute), false);
    }
}