Newtonsoft.Json使用MySqlDateTime序列化数据表

Question

I get a type of MySqlDateTime in a DataTable, which is select from MySql, just like 'select delivertime from t_storage', and then fill into a DataTable. Now I want convert this DataTable into json by Newtonsoft.Json, but it can not get the datetime, it's always convert null. Some code belows:

DataTable dt = new DataTable();
string sql = "select ig, gid, delivertime from t_storage";
MariadbHelper db = new MariadbHelper();// a dbhelper 
db.excute(sql).Fill(dt);// pull the sql result into dt
string ret = JsonConvert.SerializeObject(dt, Formatting.Indented);// the delivertime is null: [ {"id":1, "gid":1, "delivertime":null}]

I have tried use IsoDateTimeConverter to formate the date, but it does not work.

I am sure dt.Rows[0]["delivertime"] is a type of MySqlDateTime, and the value is not null. I can use '((MySql.Data.Types.MySqlDateTime)dt.Rows[0]["delivertime"]).GetDateTime()' to convert it into DataTime type. In t_storage, the column delivertime is type of datetime.

Any idears?

Answer 1

The default format used by Json.NET is the ISO 8601 standard: "2012-03-19T07:22Z". If you are getting a string in a different format then you can defined the DateTimeFormat of IsoDateTimeConverter while serializing. You can read about it here .

So define the Serialization logic as

string ret = JsonConvert.SerializeObject(dt, new IsoDateTimeConverter() { DateTimeFormat = "yyyy/M/d H:m:ss" });