dataTable = GetProduct(); List<Class1> list = new List<Class1>(); for (int i = 0; i < dataTable.Rows.Count; i++) { list.Add(new Class1 { ID = dataTable.Rows[i]["ID"].ToString(), BaseClass = new BaseClass { CreateDate = dataTable.Rows[i]["CreateDate"].ToString() } } } string jsonString = JsonConvert.SerializeObject(list);
File.WriteAllText("json.txt", jsonString);
var
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