List<T> 添加 DataTable

 1  public System.Data.DataTable getDataTable()
 2     {
 3         System.Data.DataTable dt = new System.Data.DataTable();
 4         dt.Columns.Add(new DataColumn("username", typeof(string)));
 5         dt.Columns.Add(new DataColumn("userid", typeof(string)));
 6         dt.Columns.Add(new DataColumn("createtime", typeof(string)));
 7 
 8         using (BXSEntities BX = new BXSEntities())
 9         {
10             List<users> users = BX.users.Select(u => u).ToList();
11             
12             foreach (var item in users)
13             {
14                 DataRow row = dt.NewRow();
15                 row[0] = item.userName;
16                 row[1] = item.userID;
17                 row[2] = item.createTime;
18                 dt.Rows.Add(row);
19             }
20         }
21         return dt;
22     }