如何使用NewtonSoft更新JSON对象的属性

您可以使用属性作为键来访问对象：

JObject obj = JObject.Parse(json);string gender = (string)obj["value"]["option"];

对于您的示例，请尝试：

JObject obj = JObject.Parse(json);var val = obj["value"];string option = (string)val["option"];if (option == "ML")   val["option"] = "Male";if (option == "FM")   val["option"] = "Female";string result = obj.ToString();