How To Test if a Type is Anonymous? [duplicate]

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From http://www.liensberger.it/web/blog/?p=191:

private static bool CheckIfAnonymousType(Type type)
{
    if (type == null)
        throw new ArgumentNullException("type");

    // HACK: The only way to detect anonymous types right now.
    return Attribute.IsDefined(type, typeof(CompilerGeneratedAttribute), false)
        && type.IsGenericType && type.Name.Contains("AnonymousType")
        && (type.Name.StartsWith("<>") || type.Name.StartsWith("VB$"))
        && type.Attributes.HasFlag(TypeAttributes.NotPublic);
}

EDIT:
Another link with extension method: Determining whether a Type is an Anonymous Type

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