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Serializing ExpandoObject with ServiceStack.Text

I am trying to serialize objects using the ServiceStack.Text library . It works

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

I get as I expect

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

However

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

I bring my surprise

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

Why! What's happening?

Secondly , how can I get what I want?

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1 answer

ExpandoObjectimplements IConnection<KeyValuePair>and IEnumerable<KeyValuePair>:

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

I assume that the ServiceStack intranet serializer handles ExpandoObjecthow IEnumerable<KeyValuePair>, and therefore it is serialized into a JSON array of key / value pairs.

This is different from your first (working) piece of code, because .NET actually creates a real (anonymous) class for your data, basically it does:

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

, , , , ExpandoObject object[] .

, Microsoft System.Web.Helpers.Json . :

    [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);
    }

:

, , ExpandoObject Dictionary<string, object>. , , 2 ( , ).

    [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);
    }

, System.Web.Helpers.Json, ExpandoObject DynamicJsonObject :

    [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);
    }

Ans, , : ExpandoObject, JsonResult asp.net mvc?

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