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Asked: 2026-05-24T05:52:16+00:00

In C#, I have successfully serialized an anonymous object into JSON by use of

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In C#, I have successfully serialized an anonymous object into JSON by use of code like this…

var obj = new { Amount = 108, Message = "Hello" };
JavaScriptSerializer serializer = new JavaScriptSerializer();
String output = serializer.Serialize(obj);

However, what I would like to be able to do later is to deserialize the JSON string back into an anonymous object. Something like this…

var obj2 = serializer.Deserialize(output, object);

But the serializer.Deserialize() method requires a second parameter that is the type of object it will deserialize to.

I tried this…

var obj2 = serializer.Deserialize(output, obj.GetType());

But this produces an error:

No parameterless constructor defined for type of ‘<>f__AnonymousType0`2[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]’.

I’m not sure what this error means.

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1 Answer

  1. Editorial Team

    JSON.Net is a powerful library to work with JSON in .Net

    There’s a method DeserializeAnonymousType you can tap in to.

    Update: Json.Net is now included with ASP.Net, however my latest favorite that I use is JsonFX. It’s got great linq support as well, check it out.

    Update 2: I’ve moved on from JsonFX, and currently use ServiceStack.Text, it’s fast!

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