序列化ExpandoObject与ServiceStack.Text

本文介绍了序列化ExpandoObject与ServiceStack.Text的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想序列化与图书馆 ServiceStack.Text 的对象。这适用

I am trying to serialize objects with the library ServiceStack.Text . This works

using System.Dynamic; using ServiceStack.Text; var x = new {Value= 10, Product = "Apples"}; Console.WriteLine(JsonSerializer.SerializeToString(x));

我得到的，因为我希望

I get, as I expect

{"Value":10,"Product":"Apples"}

然而

dynamic x = new ExpandoObject(); x.Value = 100; x.Product = "Apples"; Console.WriteLine(JsonSerializer.SerializeToString(x));

我得到我吃惊的是

I get to my surprise

[{"Key":"Value","Value":100},{"Key":"Product","Value":"Apples"}]

为什么！这是怎么回事？

Why! What's going on?

第二，我怎么能得到我想要什么？的

推荐答案

ExpandoObject 工具 IConnection＆LT; KeyValuePair＆GT; 和的IEnumerable＆LT; KeyValuePair＆GT; ：

public sealed class ExpandoObject : IDynamicMetaObjectProvider, IDictionary<string, object>, ICollection<KeyValuePair<string, object>>, IEnumerable<KeyValuePair<string, object>>, IEnumerable, INotifyPropertyChanged

我的猜测是，在国内，ServiceStack串行器治疗 ExpandoObject 为的IEnumerable＆LT; KeyValuePair＆GT; ，和所以它系列化，以键/值对的JSON数组。

My guess is that internally, the ServiceStack serializer is treating the ExpandoObject as an IEnumerable<KeyValuePair>, and so it serializes to a JSON array of key/value pairs.

这不同于你的第一个（工作）code段，因为.NET实际上建立了一个真正的（匿名）类为您的数据，基本上它使：

This differs from your first (working) code snippet because .NET actually builds a real (anonymous) class for your data, basically it makes:

public class SomeNameTheCompilerMakesUp { internal int Value { get; set; } internal string Product { get; set; } }

自动为您，所以当它被发送到串行化器，它正在与一个真正的类不动产，而 ExpandoObject 真的是由 [对象] 内部。

在一个侧面说明，微软 System.Web.Helpers.Json 进行同样的操作。该测试通过：

On a side-note, Microsoft's System.Web.Helpers.Json behaves the same way. This test passes:

[TestMethod] public void ExpandoObjectSerializesToJsonArray() { dynamic anonType = new { Value = 10, Product = "Apples" }; dynamic expando = new ExpandoObject(); expando.Value = 10; expando.Product = "Apples"; var anonResult = System.Web.Helpers.Json.Encode(anonType); var expandoResult = System.Web.Helpers.Json.Encode(expando); Assert.AreEqual("{\"Value\":10,\"Product\":\"Apples\"}", anonResult); Assert.AreEqual("[{\"Key\":\"Value\",\"Value\":10},{\"Key\":\"Product\",\"Value\":\"Apples\"}]", expandoResult); }

最后一个编辑：的

One final edit:

您可以使这项工作要通过旋转的方式你的 ExpandoObject 到词典＆LT;字符串，对象＆gt; 。需要说明的这个code是它复制数据到一本字典，让你有2份内存（或略小于，由于技术上的弦可能会扣留）。

You can make this work the way you want by turning your ExpandoObject into a Dictionary<string, object>. The caveat to this code is that it duplicates the data into a dictionary, so you have 2 copies in memory (or slightly less than, since technically the strings might be interned).

[TestMethod] public void TestMethod1() { dynamic expando = new ExpandoObject(); expando.Value = 10; expando.Product = "Apples"; // copy expando properties to dictionary var dictionary = ((ExpandoObject)expando).ToDictionary(x => x.Key, x => x.Value); var expandoResult = System.Web.Helpers.Json.Encode(expando); var dictionaryResult = System.Web.Helpers.Json.Encode(dictionary); Assert.AreEqual("[{\"Key\":\"Value\",\"Value\":10},{\"Key\":\"Product\",\"Value\":\"Apples\"}]", expandoResult); Assert.AreEqual("{\"Value\":10,\"Product\":\"Apples\"}", dictionaryResult); }

虽然，对于任何人遇到这样过去了，而实际上使用 System.Web.Helpers.Json ，更好的事情要做的只是包装你的 ExpandoObject 在 DynamicJsonObject 是这样的：

Although, for anyone that comes across this later, and is actually using System.Web.Helpers.Json, the better thing to do is just wrap your ExpandoObject in a DynamicJsonObject like this:

[TestMethod] public void TestMethod1() { dynamic expando = new ExpandoObject(); expando.Value = 10; expando.Product = "Apples"; var dictionaryResult = System.Web.Helpers.Json.Encode(new DynamicJsonObject(expando)); Assert.AreEqual("{\"Value\":10,\"Product\":\"Apples\"}", dictionaryResult); }

答一次，我通过努力，我发现了一个类似的问题在这里：How扁平化的ExpandoObject通过JsonResult在asp mvc的返回？