C # JSON deserialization data contract type cannot be deserialized because a required data member was not found

Background today in use: C # Json serialization and deserialization

The following error message appears when deserializing.

System.Runtime.Serialization.SerializationException: Data contract type ' testentity ' cannot be deserialized because the required data member ' Multiplechoice is not found, Runtimedisplaycolumns ". In System.ComponentModel.ReflectPropertyDescriptor.SetValue (object component, Object value)

The reason for this is that I have added two new attributes to the deserialized entity class:

private bool Multiplechoice;        <summary>        ///Whether the Help engine allows multiple selections             ///</summary> [XmlIgnore]        [Browsable (false)]        public BOOL Multiplechoice        {            get            {                return multiplechoice;            }            Set            {                multiplechoice = value;            }        }        private string runtimedisplaycolumns;        <summary>        ///The column displayed when the engine is running             ///</summary> [XmlIgnore]        [Browsable (false)]        public string Runtimedisplaycolumns        {            get            {                return runtimedisplaycolumns;            }            Set            {                runtimedisplaycolumns = value;            }        }

When using a previously saved JSON string to deserialize, the new two two properties, no corresponding value, so reported the above error.

Workaround:

[datacontract]public class testentity{private bool Multiplechoice; <summary>///Whether the Help engine allows multiple selections///</summary> [XmlIgnore] [browsable (false)][da  Tamember (isrequired = false)] public bool Multiplechoice {get {return            Multiplechoice;            } set {multiplechoice = value;        }} private string Runtimedisplaycolumns; <summary>///The column that is displayed when the engine runs///</summary> [XmlIgnore] [browsable (false)][d                Atamember (isrequired = False)] public string Runtimedisplaycolumns {get {            return runtimedisplaycolumns;            } set {runtimedisplaycolumns = value; }        }}

This property is not required through the DataMember (IsRequired = False) property surface. This ensures that when deserializing, the definition of the missing attribute in the JSON string is normally deserialized.

Small bet

after adding DataMember (IsRequired = False) on the property, the [DataContract] identity must be added on the corresponding class.

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