Json字符串格式化网址:https://www.json.cn/
//序列化:
string json = JsonConvert.SerializeObject(dt);
Console.WriteLine(json);
//反序列化:
DataTable dt1 = JsonConvert.DeserializeObject<DataTable>(json);
for (int i = 0; i < dt1.Rows.Count; i++)
{
DataRow dr = dt1.Rows[i];
Console.WriteLine("{0}\t{1}\t{2}\t", dr[0], dr[1], dr[2]);
}