在.NET 4中将C＃对象转换为JSONstring

我有这样的课程：

class MyDate { int year, month, day; } class Lad { string firstName; string lastName; MyDate dateOfBirth; } 

我想将一个Lad对象转换成如下所示的JSONstring：

 { "firstName":"Markoff", "lastName":"Chaney", "dateOfBirth": { "year":"1901", "month":"4", "day":"30" } } 

（没有格式）。 我发现这个链接 ，但它使用了一个不在.NET 4中的命名空间。我也听说过JSON.NET ，但是他们的网站似乎在closures，而我并不热衷于使用外部DLL文件。 除了手动创buildJSONstring编写器之外，还有其他选项吗？

Answer 1

您可以使用JavaScriptSerializer类（添加对System.Web.Extensions引用）：

 using System.Web.Script.Serialization; 

 var json = new JavaScriptSerializer().Serialize(obj); 

一个完整的例子：

 using System; using System.Web.Script.Serialization; public class MyDate { public int year; public int month; public int day; } public class Lad { public string firstName; public string lastName; public MyDate dateOfBirth; } class Program { static void Main() { var obj = new Lad { firstName = "Markoff", lastName = "Chaney", dateOfBirth = new MyDate { year = 1901, month = 4, day = 30 } }; var json = new JavaScriptSerializer().Serialize(obj); Console.WriteLine(json); } } 

Answer 2

因为我们都爱一个class轮

…这个取决于Newtonsoft NuGet包，它比默认的序列化器更stream行，更好。

 Newtonsoft.Json.JsonConvert.SerializeObject(new {foo = "bar"}) 

文档： 序列化和反序列化JSON

Answer 3

使用DataContractJsonSerializer类： MSDN1 ， MSDN2 。

我的例子： 这里 。

与JavaScriptSerializer不同，它也可以安全地反序列化JSONstring中的对象。 但个人而言，我仍然更喜欢Json.NET 。

Answer 4

Wooou！ 真的更好使用JSON框架:)

这里是我的例子使用Json.NET（ http://james.newtonking.com/json ）：

 using System; using System.Collections.Generic; using System.Text; using Newtonsoft.Json; using System.IO; namespace com.blogspot.jeanjmichel.jsontest.model { public class Contact { private Int64 id; private String name; List<Address> addresses; public Int64 Id { set { this.id = value; } get { return this.id; } } public String Name { set { this.name = value; } get { return this.name; } } public List<Address> Addresses { set { this.addresses = value; } get { return this.addresses; } } public String ToJSONRepresentation() { StringBuilder sb = new StringBuilder(); JsonWriter jw = new JsonTextWriter(new StringWriter(sb)); jw.Formatting = Formatting.Indented; jw.WriteStartObject(); jw.WritePropertyName("id"); jw.WriteValue(this.Id); jw.WritePropertyName("name"); jw.WriteValue(this.Name); jw.WritePropertyName("addresses"); jw.WriteStartArray(); int i; i = 0; for (i = 0; i < addresses.Count; i++) { jw.WriteStartObject(); jw.WritePropertyName("id"); jw.WriteValue(addresses[i].Id); jw.WritePropertyName("streetAddress"); jw.WriteValue(addresses[i].StreetAddress); jw.WritePropertyName("complement"); jw.WriteValue(addresses[i].Complement); jw.WritePropertyName("city"); jw.WriteValue(addresses[i].City); jw.WritePropertyName("province"); jw.WriteValue(addresses[i].Province); jw.WritePropertyName("country"); jw.WriteValue(addresses[i].Country); jw.WritePropertyName("postalCode"); jw.WriteValue(addresses[i].PostalCode); jw.WriteEndObject(); } jw.WriteEndArray(); jw.WriteEndObject(); return sb.ToString(); } public Contact() { } public Contact(Int64 id, String personName, List<Address> addresses) { this.id = id; this.name = personName; this.addresses = addresses; } public Contact(String JSONRepresentation) { //To do } } } 

考试：

 using System; using System.Collections.Generic; using com.blogspot.jeanjmichel.jsontest.model; namespace com.blogspot.jeanjmichel.jsontest.main { public class Program { static void Main(string[] args) { List<Address> addresses = new List<Address>(); addresses.Add(new Address(1, "Rua Dr. Fernandes Coelho, 85", "15º andar", "São Paulo", "São Paulo", "Brazil", "05423040")); addresses.Add(new Address(2, "Avenida Senador Teotônio Vilela, 241", null, "São Paulo", "São Paulo", "Brazil", null)); Contact contact = new Contact(1, "Ayrton Senna", addresses); Console.WriteLine(contact.ToJSONRepresentation()); Console.ReadKey(); } } } 

结果：

 { "id": 1, "name": "Ayrton Senna", "addresses": [ { "id": 1, "streetAddress": "Rua Dr. Fernandes Coelho, 85", "complement": "15º andar", "city": "São Paulo", "province": "São Paulo", "country": "Brazil", "postalCode": "05423040" }, { "id": 2, "streetAddress": "Avenida Senador Teotônio Vilela, 241", "complement": null, "city": "São Paulo", "province": "São Paulo", "country": "Brazil", "postalCode": null } ] } 

现在我将实现将接收JSONstring并填充类的字段的构造方法。

Answer 5

使用Json.Net库，你可以从Nuget Packet Manager下载它。

序列化为Jsonstring：

  var obj = new Lad { firstName = "Markoff", lastName = "Chaney", dateOfBirth = new MyDate { year = 1901, month = 4, day = 30 } }; var jsonString = Newtonsoft.Json.JsonConvert.SerializeObject(obj); 

反序列化为对象：

 var obj = Newtonsoft.Json.JsonConvert.DeserializeObject<Lad>(jsonString ); 

Answer 6

我会投票ServiceStack的JSON序列化程序：

 using ServiceStack.Text string jsonString = new { FirstName = "James" }.ToJson(); 

它也是.NET中可用的最快的JSON序列化程序： http : //www.servicestack.net/benchmarks/

Answer 7

使用这个工具来生成C＃类

并使用此代码

  var json = new JavaScriptSerializer().Serialize(obj); 

用于序列化你的对象

Answer 8

像这样简单，也适用于dynamic对象（types对象）：

 string json = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(MYOBJECT); 

Answer 9

使用下面的代码将XML转换为JSON。

 var json = new JavaScriptSerializer().Serialize(obj); 

Answer 10

如果你在一个ASP.NET MVC的Web控制器，它是如此简单：

 string ladAsJson = Json(Lad); 

不敢相信没有人提到过这个。

Answer 11

串行

  public static void WriteToJsonFile<T>(string filePath, T objectToWrite, bool append = false) where T : new() { var contentsToWriteToFile = JsonConvert.SerializeObject(objectToWrite, new JsonSerializerSettings { Formatting = Formatting.Indented, }); using (var writer = new StreamWriter(filePath, append)) { writer.Write(contentsToWriteToFile); } } 

目的

 namespace MyConfig { public class AppConfigurationSettings { public AppConfigurationSettings() { /* initialize the object if you want to output a new document * for use as a template or default settings possibly when * an app is started. */ if (AppSettings == null) { AppSettings=new AppSettings();} } public AppSettings AppSettings { get; set; } } public class AppSettings { public bool DebugMode { get; set; } = false; } } 

履行

 var jsonObject = new AppConfigurationSettings(); WriteToJsonFile<AppConfigurationSettings>(file.FullName, jsonObject); 

产量

 { "AppSettings": { "DebugMode": false } } 

Answer 12

注意用正确的属性创build你的类：

使用<Serializable>属性根据示例C＃示例，然后使用vb.net exmpale创build此类

C＃

 using Microsoft.VisualBasic; using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Diagnostics; using System.Web; using System.Web.Script.Serialization; namespace Samples { [Serializable()] public class Customer { private int _idcustomer; public int IDCustomer { get { return _idcustomer; } set { _idcustomer = value; } } private System.DateTime _RegistrationDate; public System.DateTime RegistrationDate { get { return _RegistrationDate; } set { _RegistrationDate = value; } } private string _Name; public string Name { get { return _Name; } set { _Name = value; } } private string _Surname; public string Surname { get { return _Surname; } set { _Surname = value; } } } [Serializable()] public class Product { private int _ProductID; public int ProductID { get { return _ProductID; } set { _ProductID = value; } } private string _ProductName; public string ProductName { get { return _ProductName; } set { _ProductName = value; } } private int _Price; public int Price { get { return _Price; } set { _Price = value; } } private bool _inStock; public bool inStock { get { return _inStock; } set { _inStock = value; } } } [Serializable()] public class Order { private int _OrderId; public int OrderID { get { return _OrderId; } set { _OrderId = value; } } private int _customerID; public int CustomerID { get { return _customerID; } set { _customerID = value; } } private List<Product> _ProductsList; public List<Product> ProductsList { get { return _ProductsList; } set { _ProductsList = value; } } private System.DateTime _PurchaseDate; public System.DateTime PurchaseDate { get { return _PurchaseDate; } set { _PurchaseDate = value; } } private string _PaymentMethod; public string PaymentMethod { get { return _PaymentMethod; } set { _PaymentMethod = value; } } public string ToJson() { string json = string.Empty; JavaScriptSerializer js = new JavaScriptSerializer(); json = js.Serialize(this); js = null; return json; } } } 

VBNET示例

 Imports System Imports System.Web Imports System.Web.Script.Serialization Namespace Samples <Serializable()> Public Class Customer Private _idcustomer As Integer Public Property IDCustomer() As Integer Get Return _idcustomer End Get Set(ByVal value As Integer) _idcustomer = value End Set End Property Private _RegistrationDate As Date Public Property RegistrationDate() As Date Get Return _RegistrationDate End Get Set(ByVal value As Date) _RegistrationDate = value End Set End Property Private _Name As String Public Property Name() As String Get Return _Name End Get Set(ByVal value As String) _Name = value End Set End Property Private _Surname As String Public Property Surname() As String Get Return _Surname End Get Set(ByVal value As String) _Surname = value End Set End Property End Class <Serializable()> Public Class Product Private _ProductID As Integer Public Property ProductID() As Integer Get Return _ProductID End Get Set(ByVal value As Integer) _ProductID = value End Set End Property Private _ProductName As String Public Property ProductName() As String Get Return _ProductName End Get Set(ByVal value As String) _ProductName = value End Set End Property Private _Price As Integer Public Property Price() As Integer Get Return _Price End Get Set(ByVal value As Integer) _Price = value End Set End Property Private _inStock As Boolean Public Property inStock() As Boolean Get Return _inStock End Get Set(ByVal value As Boolean) _inStock = value End Set End Property End Class <Serializable> Public Class Order Private _OrderId As Integer Public Property OrderID() As Integer Get Return _OrderId End Get Set(ByVal value As Integer) _OrderId = value End Set End Property Private _customerID As Integer Public Property CustomerID() As Integer Get Return _customerID End Get Set(ByVal value As Integer) _customerID = value End Set End Property Private _ProductsList As List(Of Product) Public Property ProductsList() As List(Of Product) Get Return _ProductsList End Get Set(ByVal value As List(Of Product)) _ProductsList = value End Set End Property Private _PurchaseDate As Date Public Property PurchaseDate() As Date Get Return _PurchaseDate End Get Set(ByVal value As Date) _PurchaseDate = value End Set End Property Private _PaymentMethod As String Public Property PaymentMethod() As String Get Return _PaymentMethod End Get Set(ByVal value As String) _PaymentMethod = value End Set End Property Public Function ToJson() As String Dim json As String = String.Empty Dim js As New JavaScriptSerializer json = js.Serialize(Me) js = Nothing Return json End Function End Class 

结束命名空间

第二步是创build一个简单的testing数据，如下所示：

C＃

  void Main() { List<Samples.Product> ListProducts = new List<Samples.Product>(); ListProducts.Add(new Samples.Product(), With, {.inStock=False,.Price=10, .ProductID=1,.ProductName=BookOne); ListProducts.Add(new Samples.Product(), With, {.inStock=False,. Price=10, .ProductID=2, .ProductName=Hotels California); ListProducts.Add(new Samples.Product(), With, {.inStock=False,.Price=10,.ProductID=3,.ProductName=Cbr); ListProducts.Add(new Samples.Product(), With, {.inStock=False,.Price=10,.ProductID=4,.ProductName=Mustang); ListProducts.Add(new Samples.Product(), With, {.inStock=False,.Price=10, .ProductID=15,.ProductName=Anything); ListProducts.Add(new Samples.Product(), With, {.inStock=False,.Price=10,.ProductID=38,.ProductName=Monster Truck); Samples.Customer Customer = new Samples.Customer(); // With... Customer.IDCustomer = 1; Customer.Name = "Customer1"; Customer.RegistrationDate = Now; Customer.Surname = "SurnameCustomer"; Samples.Order Order = new Samples.Order(); // With... Order.CustomerID = Customer.IDCustomer; Order.OrderID = 1; Order.PaymentMethod = "PayPal"; Order.ProductsList = ListProducts; Order.PurchaseDate = Now; Console.WriteLine(Order.ToJson); Console.ReadLine(); } 

VB.NET

 Sub Main() Dim ListProducts As New List(Of Samples.Product) ListProducts.Add(New Samples.Product With {.inStock = False, .Price = 10, .ProductID = 1, .ProductName = "BookOne"}) ListProducts.Add(New Samples.Product With {.inStock = False, .Price = 10, .ProductID = 2, .ProductName = "Hotels California"}) ListProducts.Add(New Samples.Product With {.inStock = False, .Price = 10, .ProductID = 3, .ProductName = "Cbr"}) ListProducts.Add(New Samples.Product With {.inStock = False, .Price = 10, .ProductID = 4, .ProductName = "Mustang"}) ListProducts.Add(New Samples.Product With {.inStock = False, .Price = 10, .ProductID = 15, .ProductName = "Anything"}) ListProducts.Add(New Samples.Product With {.inStock = False, .Price = 10, .ProductID = 38, .ProductName = "Monster Truck"}) Dim Customer As New Samples.Customer With {.IDCustomer = 1, .Name = "Customer1",.RegistrationDate = Now, .Surname ="SurnameCustomer"} Dim Order As New Samples.Order With { .CustomerID = Customer.IDCustomer, .OrderID = 1, .PaymentMethod = "PayPal", .ProductsList = ListProducts, .PurchaseDate = Now } Console.WriteLine(Order.ToJson) Console.ReadLine() End Sub 

这是最后的结果：

 {"OrderID":1,"CustomerID":1,"ProductsList":[{"ProductID":1,"ProductName":"BookOn e","Price":10,"inStock":false},{"ProductID":2,"ProductName":"Hotels California", "Price":10,"inStock":false},{"ProductID":3,"ProductName":"Cbr","Price":10,"inSto ck":false},{"ProductID":4,"ProductName":"Mustang","Price":10,"inStock":false},{" ProductID":15,"ProductName":"Anything","Price":10,"inStock":false},{"ProductID": 38,"ProductName":"Monster Truck","Price":10,"inStock":false}],"PurchaseDate":"\/ Date(1396642206155)\/","PaymentMethod":"PayPal"} 

记得要添加一个对system.web.extension.dll的引用来实现你的目标。