Foreach使用时需要注意的地方。Collection was modified; enumeration operation may not execute."的错误。

 

 

                    foreach (SPListItem item in list.Items)
                   {
                       item.Delete();   
                   }                    
           

           用foreach不能修改集合中的元素的，用
            SPListItemCollection itemcollection=list.Items;
                if(itemcollection.Count>0)
                {
                    for(int i=itemcollection.Count-1;i>=0;i--)
                    {
                        itemcollection[i].Delete();
                    }
                }