Serialize an object directly to a JObject instead of to a string in json.net

问题

How might one serialize an object directly to a JObject instance in JSON.Net? What is typically done is to convert the object directly to a json string like so:

string jsonSTRINGResult = JsonConvert.SerializeObject(someObj);

One could then deserialize that back to a JObject as follows:

JObject jObj = JsonConvert.DeserializeObject<JObject>(jsonSTRINGResult);

That seems to work, but it would seem like this way has a double performance hit (serialize and then deserialize). Does SerializeObject internally use a JObject that can be accessed somehow? Or is there some way to just serialize directly to a JObject?

回答1:

You can use FromObject static method of JObject

JObject jObj = JObject.FromObject(someObj)

http://www.newtonsoft.com/json/help/html/M_Newtonsoft_Json_Linq_JObject_FromObject.htm

回答2:

Please note that the JObject route suggested by @Eser will work only for non-array CLR objects. It results in below exception if you try converting an Array object to JObject:

An unhandled exception of type 'System.InvalidCastException' occurred in Newtonsoft.Json.dll

Additional information: Unable to cast object of type 'Newtonsoft.Json.Linq.JArray' to type 'Newtonsoft.Json.Linq.JObject'.

So, in case it is an array object then you should be using JArray instead as shown below:

JArray jArray = JArray.FromObject(someArrayObject);

Please include using Newtonsoft.Json.Linq; at the top of your code file to use this code snippet.

来源：https://stackoverflow.com/questions/33088297/serialize-an-object-directly-to-a-jobject-instead-of-to-a-string-in-json-net