Question

我正在连接外部API，（给定参数），在JSON中打印结果集。目标是将此JSON转换为可读值并将它们添加到对象数组中。它是一个UWP应用程序，因此我在互联网上找到的一些旧库不再可用。以下是获取JSON然后尝试解析它的代码块：

private void beginWork()
{
    string feed_data = getFeed().Replace(@"\", "").Trim(new char[1] { '"' });
    Debug.WriteLine(feed_data); // <-- THIS PRINTS OUT THE CORRECTLY FORMATTED JSON WITHOUT ANY ESCAPE CHARACTERS
    JsonObject obj = JsonObject.Parse(feed_data); // <-- THROWS AN "INVALID JSON ERROR HERE" AND VALUE OF VARIABLE IN AUTOS SHOWS JSON DATA WITH ESCAPE CHARACTERS AND ADDITIONAL QUOTATION MARKS BEFORE AND AFTER THE STRING
}

private string getFeed()
{
    HttpClient client = new HttpClient();
    string url = "URL HERE";
    HttpResponseMessage response = client.GetAsync(url).Result;
   return response.Content.ReadAsStringAsync().Result;
}

那么这里出了什么问题？执行Debug.WriteLine(feed_data);行时，我在输出控制台中看到了有效的JSON，但仍然得到了解析错误。

编辑：示例JSON（预期和控制台中显示的那个）：

[{"id":"884","author":"795","title":"The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?","details":" ","datetime":"1439099443","answered":"1","vote":"0","answers":[{"id":"884","author":"788","answer":"4 years","datetime":"1439165670","votes":"0"}]}]

vs Autos窗口中的JSON以及解析失败的原因：

"[{\"id\":\"884\",\"author\":\"795\",\"title\":\"The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?\",\"details\":\" \",\"datetime\":\"1439099443\",\"answered\":\"1\",\"vote\":\"0\",\"answers\":[{\"id\":\"884\",\"author\":\"788\",\"answer\":\"4 years\",\"datetime\":\"1439165670\",\"votes\":\"0\"}]}]"

Answer 1

您的JSON字符串表示JSON数组而不是JSON对象。使用JSON.NET（我没有在UWP中测试的开发环境）我通过JObject.Parse(feed_data)得到了同样的错误，可以使用JArray.Parse(feed_data)修复它。所以，我强烈怀疑在UWP中，等效的解决方案是使用JsonArray.Parse()：

JsonArray arr = JsonArray.Parse(feed_data);

控制台显示格式正确的JSON，但JsonObject无法解析它

1 个答案: