C# serialisieren komplexes Objekt der Klasse zu JSON

Question

Ich möchte neues Objekt der folgenden Klasse in JSON String konvertieren. Dazu benutze ich entweder JavaScriptSerializer und Newtonsoft library. aber die Ausgabe für beide von ihnen ist leere Klammern ({[], []})!

using System; 
using System.Collections; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Data; 

namespace My_Entity 
{ 
    using My_Entity.Interfaces; 
    using My_Entity.Abstracts; 

    public class tbl_CategoryEntity : Entity<tbl_CategoryEntity>, Itbl_Category 
    { 
     private Int32? _CategoryID; 
     private String _CategoryName; 
     private Int32? _TypeID; 
     private Boolean? _IsDel; 
     private static readonly string _IdentityField = "CategoryID"; 
     private static readonly SqlDbType _IdentitySqlDbType = SqlDbType.Int; 
     private readonly Dictionary<string, SqlDbType> _FieldsSqlDbType; 

     public Int32? CategoryID 
     { 
      get { return _CategoryID; } 
      set { _CategoryID = value; } 
     } 

     public String CategoryName 
     { 
      get { return _CategoryName; } 
      set { _CategoryName = value; } 
     } 

     public Int32? TypeID 
     { 
      get { return _TypeID; } 
      set { _TypeID = value; } 
     } 

     public Boolean? IsDel 
     { 
      get { return _IsDel; } 
      set { _IsDel = value; } 
     } 

     public tbl_CategoryEntity() 
     { 
      _FieldsSqlDbType = new Dictionary<string, SqlDbType>() 
      { 
       { "CategoryID", SqlDbType.Int }, 
       { "CategoryName", SqlDbType.NVarChar }, 
       { "TypeID", SqlDbType.Int }, 
       { "IsDel", SqlDbType.Bit } 
      }.Union(base._FilterFieldsSqlDbType).ToDictionary(k => k.Key, v => v.Value); 
     } 

     public static string GetIdentityField() 
     { 
      return _IdentityField; 
     } 

     public static SqlDbType GetIdentitySqlDbType() 
     { 
      return _IdentitySqlDbType; 
     } 

     public override SqlDbType GetSqlDbType(string PropertyName) 
     { 
      return _FieldsSqlDbType[PropertyName]; 
     } 

     public override bool IsIdentity(string PropertyName) 
     { 
      return PropertyName.Equals(_IdentityField); 
     } 
    } 
} 

tbl_CategoryEntity a = new tbl_CategoryEntity() 
{ 
    CategoryID = 12, 
    CategoryName = "hi" 
}; 
string json = new JavaScriptSerializer().Serialize(a); 

wie kann ich es beheben?

Answer 1

die Basisklasse (Entity) ist:

using System; 
using System.Collections; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Data; 
using System.Data.Sql; 

namespace My_Entity.Abstracts 
{ 
    using My_Entity.Interfaces; 

    public abstract class Entity<T> : List<T>, IEntity where T : new() 
    { 
     private String _OrderColumn; 
     private String _Order = "asc"; 
     private Int32? _PageIndex = 1; 
     private Int32? _RowsPage = 10; 
     protected readonly Dictionary<string, SqlDbType> _FilterFieldsSqlDbType; 

     public String OrderColumn 
     { 
      get { return _OrderColumn; } 
      set { _OrderColumn = value; } 
     } 
     public String Order 
     { 
      get { return _Order; } 
      set { _Order = value; } 
     } 
     public Int32? PageIndex 
     { 
      get { return _PageIndex; } 
      set { _PageIndex = value; } 
     } 
     public Int32? RowsPage 
     { 
      get { return _RowsPage; } 
      set { _RowsPage = value; } 
     } 

     public Entity() 
     { 
      _FilterFieldsSqlDbType = new Dictionary<string, SqlDbType>() 
      { 
       { "OrderColumn", SqlDbType.VarChar }, 
       { "Order", SqlDbType.VarChar }, 
       { "PageIndex", SqlDbType.Int }, 
       { "RowsPage", SqlDbType.Int }, 
      }; 
     } 

     public abstract SqlDbType GetSqlDbType(string PropertyName); 

     public abstract bool IsIdentity(string PropertyName); 
    } 
} 

Answer 2

Okay, ich denke, das Problem ist, dass Sie zusammen mit der Sammlung von Entitäten Klasse der Entity-Klasse gemischt haben. Ich habe versucht, die Sammlung von der Entität zu trennen. Schau dir diesen Code an und schau, ob es dir hilft.

namespace ConsoleApp1 
{ 
    using System; 
    using System.Linq; 
    using Newtonsoft.Json; 
    using System.Data; 
    using System.Collections.Generic; 

    class Program 
    { 
     static void Main(string[] args) 
     { 
      var t = new tbl_CategoryEntity 
      { 
       CategoryID = 12, 
       CategoryName = "Hi" 
      }; 
      var collection = new tbl_CategoryEntityCollection(); 
      collection.Add(t); 

      var entityJson = JsonConvert.SerializeObject(t); 
      var collectionJson = JsonConvert.SerializeObject(collection); 
      Console.WriteLine("Entity = \n" + entityJson); 
      Console.WriteLine("Collection = \n" + collectionJson); 

      Console.ReadKey(); 
     } 
    } 

    public class tbl_CategoryEntity 
    { 
     private Int32? _CategoryID; 
     private String _CategoryName; 
     private Int32? _TypeID; 
     private Boolean? _IsDel; 

     public tbl_CategoryEntity() { } 

     public Int32? CategoryID 
     { 
      get { return _CategoryID; } 
      set { _CategoryID = value; } 
     } 

     public String CategoryName 
     { 
      get { return _CategoryName; } 
      set { _CategoryName = value; } 
     } 

     public Int32? TypeID 
     { 
      get { return _TypeID; } 
      set { _TypeID = value; } 
     } 

     public Boolean? IsDel 
     { 
      get { return _IsDel; } 
      set { _IsDel = value; } 
     } 
    } 

    public abstract class EntityCollection<T> : List<T> where T : new() 
    { 
     private String _OrderColumn; 
     private String _Order = "asc"; 
     private Int32? _PageIndex = 1; 
     private Int32? _RowsPage = 10; 
     protected readonly Dictionary<string, SqlDbType> _FilterFieldsSqlDbType; 

     public String OrderColumn 
     { 
      get { return _OrderColumn; } 
      set { _OrderColumn = value; } 
     } 
     public String Order 
     { 
      get { return _Order; } 
      set { _Order = value; } 
     } 
     public Int32? PageIndex 
     { 
      get { return _PageIndex; } 
      set { _PageIndex = value; } 
     } 
     public Int32? RowsPage 
     { 
      get { return _RowsPage; } 
      set { _RowsPage = value; } 
     } 

     protected EntityCollection() 
     { 
      _FilterFieldsSqlDbType = new Dictionary<string, SqlDbType>() 
      { 
       { "OrderColumn", SqlDbType.VarChar }, 
       { "Order", SqlDbType.VarChar }, 
       { "PageIndex", SqlDbType.Int }, 
       { "RowsPage", SqlDbType.Int }, 
      }; 
     } 

     public abstract SqlDbType GetSqlDbType(string PropertyName); 

     public abstract bool IsIdentity(string PropertyName); 
    } 

    public class tbl_CategoryEntityCollection : EntityCollection<tbl_CategoryEntity> 
    { 
     private static readonly string _IdentityField = "CategoryID"; 
     private static readonly SqlDbType _IdentitySqlDbType = SqlDbType.Int; 
     private readonly Dictionary<string, SqlDbType> _FieldsSqlDbType; 

     public tbl_CategoryEntityCollection() : base() 
     { 
      _FieldsSqlDbType = new Dictionary<string, SqlDbType>() 
     { 
      { "CategoryID", SqlDbType.Int }, 
      { "CategoryName", SqlDbType.NVarChar }, 
      { "TypeID", SqlDbType.Int }, 
      { "IsDel", SqlDbType.Bit } 
     } 
      .Union(base._FilterFieldsSqlDbType).ToDictionary(k => k.Key, v => v.Value); 
     } 

     public static string GetIdentityField() 
     { 
      return _IdentityField; 
     } 

     public static SqlDbType GetIdentitySqlDbType() 
     { 
      return _IdentitySqlDbType; 
     } 

     public override SqlDbType GetSqlDbType(string PropertyName) 
     { 
      return _FieldsSqlDbType[PropertyName]; 
     } 

     public override bool IsIdentity(string PropertyName) 
     { 
      return PropertyName.Equals(_IdentityField); 
     } 
    } 
} 

Beachten Sie, dass die Klasse für Ihr Unternehmen ‚tbl_CategoryEntity represents a single record from the database. But, the class 'tbl_CategoryEntityCollection verwendet, um eine Sammlung zu repräsentieren, die die Datensätze aufnehmen kann.

Hoffe, dass Sie in die richtige Richtung weist!