动态JObject - 解析无效的JSON

Question

Consider I have following json:

{ "version": "1.0" }

I can parse it to dynamic JObject and use:

dynamic result = JObject.Parse(myJson);
string verison = result.Version; //works <3

But server returns the following json

{ { "version": "1.0" } }

This json is consider as valid by newtonsoft, but cannot access version anymore:

dynamic result = JObject.Parse(myJson);
string verison = result.Version; //error

How to access Version when onlt dynamic result is avalable?

Answer 1

{ { "version": "1.0" } } This json is consider as valid by newtonsoft

That is incorrect, you will not be able to parse this and will receive a exception of type Newtonsoft.Json.JsonReaderException (with: Invalid property identifier character: {. Path '', line 1, position 2.)

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Invalid JSON:

{ { "version": "1.0" } }

Valid JSON:

{ "version": "1.0" }

(In case you have server control, I suggest you make the necessary steps on the server to return valid JSON)

However, worst case scenario, you could make this invalid JSON valid by removing the first char { and last char } before parsing it. For example like so:

 var myJson = json.Substring(1, json.Length - 2);

 dynamic result = JObject.Parse(myJson);
 string version = result.version;

Where json here was the original response containing the invalid JSON.

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Also note that for the JSON you provided you must use lowercase version as result.version . The dynamic property name must match exactly the one in the JSON

Answer 2

I think you trouble in capital "V" in "Version". Should be "result.version"