. 1 , [Newtonsoft.Json.JsonIgnore] Characteristics: field is not used when Newtonsoft.Json serialized serialized. 2 , [System.Web.Script.Serialization.ScriptIgnore] Characteristics: JavaScriptSerializer use serialization field are not serialized. . 3 , [System.Xml.Serialization.XmlIgnore] Characteristics: field will not be serialized XML.