C# 对newtonsoft.json对象进行ascii排序

/// <summary>
/// 获取排序后的json字符串
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static string GetSortStrJson(object obj)
{
    JsonSerializerSettings setting = new JsonSerializerSettings();
    setting.NullValueHandling = NullValueHandling.Ignore;//null值不序列化
    string strPostData = JsonConvert.SerializeObject(obj, Formatting.None, setting);
    JObject jObject = JObject.Parse(strPostData);
    SortedDictionary<string, object> target = KeySort(jObject);
    strPostData = JsonConvert.SerializeObject(target);
    return strPostData;
}


/// <summary>
/// 按ascii顺序排序json对象的顺序
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
private static SortedDictionary<string, object> KeySort(JObject obj)
{
    var res = new SortedDictionary<string, object>();
    foreach (var x in obj)
    {
        if (x.Value is JValue) res.Add(x.Key, x.Value);
        else if (x.Value is JObject) res.Add(x.Key, KeySort((JObject)x.Value));
        else if (x.Value is JArray)
        {
            var tmp = new SortedDictionary<string, object>[x.Value.Count()];
            for (var i = 0; i < x.Value.Count(); i++)
            {
                tmp[i] = KeySort((JObject)x.Value[i]);
            }
            res.Add(x.Key, tmp);
        }
    }
    return res;
}