How do I check if a property exists on a dynamic anonymous type in c#?

Question

I have an anonymous type object that I receive as a dynamic from a method I would like to check in a property exists on that object.

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Answer 1

In case someone need to handle a dynamic object come from Json, I has modified Seth Reno answer to handle dynamic object deserialized from NewtonSoft.Json.JObjcet.

public static bool PropertyExists(dynamic obj, string name)
    {
        if (obj == null) return false;
        if (obj is ExpandoObject)
            return ((IDictionary)obj).ContainsKey(name);
        if (obj is IDictionary dict1)
            return dict1.ContainsKey(name);
        if (obj is IDictionary dict2)
            return dict2.ContainsKey(name);
        return obj.GetType().GetProperty(name) != null;
    }