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Basic Knowledge of Python (getting started)

General environment parameters

In MongoDB, the OjbectId Json serialization fails to be deserialized. You can solve the problem in the following two ways

1, the simplest and crude method, a new business primary key such as key, in this case equal to the previous _id does not work

2. Use JsonConverter

public class ObjectIdConverter : JsonConverter

{

public override bool CanConvert(Type objectType)

{

return objectType == typeof(ObjectId);

}

public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { if (reader.TokenType ! = JsonToken.String) { throw new Exception( String.Format(" Unexpected token parsing ObjectId. Expected String, got {0}." , reader.TokenType)); } var value = (string)reader.Value; return String.IsNullOrEmpty(value) ? ObjectId.Empty : new ObjectId(value); } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { if (value is ObjectId) { var objectId = (ObjectId)value; writer.WriteValue(objectId ! = ObjectId.Empty ? objectId.ToString() : String.Empty); } else { throw new Exception(" Expected ObjectId value.") ; }}}Copy the code

Add a line of code to the ObjectId field

[JsonConverter(typeof(ObjectIdConverter))] public string _id { get; set; } If Newtonsoft’s JsonConvert is used, additional parameters are required

JsonConvert.DeserializeObject(json,new ObjectIdConverter());

3. By Ignore, a very tricky way of writing

[JsonIgnore]

public override ObjectId _Id { get; set; }

[BsonIgnore] public string _IdStr { get { return Id.ToString(); } set { ObjectId id; ObjectId.TryParse(value, out id); Id = id; }}