如何从类似于PHP的C＃字典中创建JSON

$tag = array(
\'tag_uid\' => 1234,
\'x\' => 0,
\'y\' => 0
);

$tags[] = $tag;

{\"x\":\"0\",\"y\":\"0\",\"tag_uid\":\"1234\"}

 public JsonArray CreatePhotoTag(string userId)
        {
            Dictionary<string, object> tagParameters = new Dictionary<string, object>();
            tagParameters.Add(\"x\", \"0\");
            tagParameters.Add(\"y\", \"0\");
            tagParameters.Add(\"tag_uid\", userId);
            JsonArray tagsarray = ???

            return tagsarray ;
        }

var jsonSerializer = new JsonSerializer<Dictionary<String, Object>>();
var tagsArray = jsonSerializer.SerializeToString(tagParameters);

var tagsArray = JsonConvert.SerializeObject(tagParameters, Formatting.Indented);