Type extension method to check if an instance is of anonymous type

TypeExtensions_IsAnonymous.cs

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

static class TypeExtensions
{
    public static Boolean IsAnonymous(this Type type)
    {
        if (!type.GetCustomAttributes(typeof(CompilerGeneratedAttribute), false).Any()) {
            return false;
        }
        var name = type.Name;
        if (name.Length < 3) {
            return false;
        }
        return name[0] == '<'  &&
               name[1] == '>'  &&
               name.IndexOf("AnonymousType", StringComparison.Ordinal) > 0;
    }
}