DataTable dt = new DataTable();

 if (_list != null)

 {

      //通过反射获取list中的字段 
    System.Reflection.PropertyInfo[] p = _list[].GetType().GetProperties();

    foreach (System.Reflection.PropertyInfo pi in p)

     {

       dt.Columns.Add(pi.Name, System.Type.GetType(pi.PropertyType.ToString()));

     }

    for (int i = ; i < _list.Count; i++)

    {

        IList TempList = new ArrayList();

         //将IList中的一条记录写入ArrayList

        foreach (System.Reflection.PropertyInfo pi in p)

        {

          object oo = pi.GetValue(_list[i], null);

          TempList.Add(oo);

        }

       object[] itm = new object[p.Length];

      for (int j = ; j < TempList.Count; j++)

      {

        itm.SetValue(TempList[j], j);

      }

      dt.LoadDataRow(itm, true);

       }
 }