如何从 JObject 中按键获取值？

Question

我有一个这样的 JObject：

{
  "@STARTDATE": "'2016-02-17 00:00:00.000'",
  "@ENDDATE": "'2016-02-18 23:59:00.000'"
}

我想从 JObject 中获取 @STARTDATE 和 @ENDDATE 值。

---

这是我尝试完成任务的示例代码：

JObject json = JObject.Parse("{\"@STARTDATE\": \"'2016-02-17 00:00:00.000'\",\"@ENDDATE\": \"'2016-02-18 23:59:00.000'\"}");
var key = "@STARTDATE";

var value = GetJArrayValue(json, key);

private string GetJArrayValue(JObject yourJArray, JToken key)
{
    string value = "";
    foreach (JToken item in yourJArray.Children())
    {
        var itemProperties = item.Children<JProperty>();
        //If the property name is equal to key, we get the value
        var myElement = itemProperties.FirstOrDefault(x => x.Name == key.ToString());
        value = myElement.Value.ToString(); //It run into an exception here because myElement is null
        break;
    }
    return value;
}

注意：以上代码无法从JObject中按键获取值。

---

您能帮我找到一种方法从 JObject 中按键获取值吗？

Answer 1

这应该会有所帮助 -

var json = "{'@STARTDATE': '2016-02-17 00:00:00.000',  '@ENDDATE': '2016-02-18 23:59:00.000' }";
var fdate = JObject.Parse(json)["@STARTDATE"];

Answer 2

你也可以像这样获取 jObject 中某项的值：

JToken value;
if (json.TryGetValue(key, out value))
{
   DoSomething(value);
}

Answer 3

试试这个：

private string GetJArrayValue(JObject yourJArray, string key)
{
    foreach (KeyValuePair<string, JToken> keyValuePair in yourJArray)
    {
        if (key == keyValuePair.Key)
        {
            return keyValuePair.Value.ToString();
        }
    }
}