I have this simple Object class, which is filled by json content of the api controller.

[BsonId] public string Id { get; }
[JsonIgnore] public string UserId { get; set; }

I want both of these variables to access the same GUID.

1. Making guid static does not work as I want to create a new one on every object creation

2. I tried using a constructor, but it seems not to be supported

    UserObject()
    {
    string guid = Guid.NewGuid().ToString();
    Id = guid;
    UserId = guid;
    }
   

How can this be accomplished?

CodePudding user response：

Firstly why do you need two duplicate fields?

anyway...

change object to:

    [BsonId]
    [BsonRepresentation(BsonType.String)]
    public Guid Id { get; set; }

Mongo will store it as string but you can use GUID in code

when you create object just use:

   new objectname(){
    Id = Guid.NewGuid(),
    ...
   }

CodePudding user response：

If you need both fields, you could "redirect" the UserId property to read and write the value of Id, e.g.:

[BsonId] public string Id { get; }
[JsonIgnore] public string UserId 
{ 
  get { return Id; }
  set { Id = value; }
}

When the JSON is deserialized in the controller, the Id property is set; as the UserId property uses the value of the Id property internally, the value of the properties is the same.