如何从此Json获取文本（使用Json.net JObject）

Question

I have this json

{
  "Message": "The request is invalid.",
  "ModelState": {
    "UserExists": [
      "userName already exists in db."
    ]
  }
}

I can trying to loop through all the model state errors(in this case only 1 but there could be more)

but I can't figure out how to get the text out.

 JObject o = JObject.Parse(response.Content);
                        var errors = o["ModelState"];
                        foreach (var error in errors)
                        {

                        }

Answer 1

The ModelState you are getting is an object with a property called UserExists which then has an array of error strings.

So you first have to iterate all the properties of the ModelState and then all the values within the array.

var response = "{\"Message\": \"The request is invalid.\", \"ModelState\": { \"UserExists\": [ \"userName already exists in db.\" ], \"SomeOtherError\": [ \"another error.\", \"two in 1\" ] } }";
var o = JObject.Parse(response);
var errors = o["ModelState"];
foreach (var errorProperty in errors.OfType<JProperty>())
{
    foreach (var error in errorProperty.Values())
    {
        Console.WriteLine("{0}={1}", errorProperty.Name, error);
    }
}