C# Code:

/// <summary>
/// 更新明细表的外键
/// </summary>
/// <param name="detail">明细表</param>
/// <param name="foreignFieldName">外键字段名称</param>
/// <param name="foreignKeyValue">外键值</param>
protected void UpdateDetailKey(DataTable detail, string foreignFieldName, string foreignKeyValue)
{
   if (detail == null)
   throw new Exception("明细表不能为空(null)！");
   
   if (String.IsNullOrEmpty(foreignFieldName))
   throw new Exception("明细表没指定外键, 请检查表模型定义！");
   
   foreach (DataRow row in detail.Rows)
   {
      //仅新增记录才需要更新外键，注意状态的使用
      if (row.RowState == DataRowState.Added)
      {
         if (String.IsNullOrEmpty(foreignKeyValue))
         throw new Exception("外键值为空！");
         else
         row[foreignFieldName] = foreignKeyValue;
      }
   }
}

//来源:C/S框架网(www.csframework.com) QQ:23404761