如何反序列化 C#.Net Core 中的分页 object

Question

I have a string (stored in Redis) and I need to deserialize it to an object like this:

public class PagedList<T>
{
    public int TotalItems { get; }
    public int PageNumber { get; }
    public int PageSize { get; }
    public List<T> List { get; }

    //public PagedList() { }

    [JsonConstructor]
    public PagedList(IEnumerable<T> source, int totalRecord, int pageNumber, int pageSize)
    {
        TotalItems = totalRecord;
        PageNumber = pageNumber;
        PageSize = pageSize;
        List = source.ToList();
    }

    //[JsonConstructor]
    public PagedList(IQueryable<T> source, int totalRecord, int pageNumber, int pageSize)
    {
        TotalItems = totalRecord;
        PageNumber = pageNumber;
        PageSize = pageSize;
        List = source.ToList();
    }

    public int TotalPages => (int)Math.Ceiling(this.TotalItems / (double)this.PageSize);

    public PagingHeader GetHeader()
    {
        return new PagingHeader(this.TotalItems, this.PageNumber, this.PageSize, this.TotalPages);
    }
}

The string is:

{
  "TotalItems": 63,
  "PageNumber": 1,
  "PageSize": 2147483646,
  "List": [
    {
      "Id": 6,
      "Tendvhc": "Tỉnh Lào Cai",
      "Parentid": null,
      "Matinh": "10",
      "Mahuyen": "000",
      "Maxa": "00000",
      "Status": 1
    }
  ]
}

I'm using this in my code, but getting error:

JsonConvert.DeserializeObject<T>(jsonString)

Newtonsoft.Json.JsonSerializationException: Unable to find a constructor to use for type GIS.CQRS.Queries.PagedList`1[iNRES.Service.Category.Domain.Models.Dvhc]. A class should either have a default constructor, one constructor with arguments or a constructor marked with the JsonConstructor attribute. Path 'TotalItems', line 1, position 14. at Newtonsoft.Json.Serialization.JsonS

How can I deal with complex object like above?

Answer 1

I have just fixed this problem by:

using

using JsonConstructorAttribute = Newtonsoft.Json.JsonConstructorAttribute;

instead of

using System.Text.Json.Serialization;

and adding this constructor

[JsonConstructor]
public PagedList(List<T> list, int totalItems, int pageNumber, int pageSize)
{
    this.TotalItems = totalItems;
    this.PageNumber = pageNumber;
    this.PageSize = pageSize;
    this.List = list;
}