把DataTable转换为泛型List<T>或是JSON

 public static List<T> ToList<T>(this DataTable dt)
        {
            var columnNames = dt.Columns.Cast<DataColumn>()
                .Select(c => c.ColumnName)
                .ToList();

            var properties = typeof(T).GetProperties();

            return dt.AsEnumerable().Select(row =>
            {
                var objT = Activator.CreateInstance<T>();

                foreach (var pro in properties)
                {
                    if (columnNames.Contains(pro.Name))
                        pro.SetValue(objT, row[pro.Name] == DBNull.Value ? string.Empty : row[pro.Name].ToString(), null);
                }

                return objT;
            }).ToList();
        }

 public static string ToJson(this DataTable table)
        {
            List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

            foreach (DataRow row in table.Rows)
            {
                Dictionary<string, object> dict = new Dictionary<string, object>();

                foreach (DataColumn col in table.Columns)
                {
                    dict[col.ColumnName] = row[col];
                }
                list.Add(dict);
            }
                        
            return serializer.Serialize(list);
        }