概要

在sharepoint中的自定义web part会涉及到对list里面的item进行操作，这篇文单将会讲解如何修改list里的item。

我们先看一个示例

/// 
        ///         /// 
        ///         /// 
            public SPListItemCollection GetSPListItemCollection(string ID)        {            SPListItemCollection itemCollection = new SPListItemCollection();            SPSecurity.RunWithElevatedPrivileges(                    delegate                    {                        using (SPSite spsite = new SPSite(this.CurrentUrl))                        {                            using (SPWeb spWeb = spsite.OpenWeb())                            {                                SPList listInstance = spWeb.Lists[this.ListName];                                SPQuery query = new SPQuery();                                query.Query = "
    
     
      
      
       " + ID + "
      
     
    ";                                itemCollection = listInstance.GetItems(query);                            }                        }                    }                );            return itemCollection;        }

SPSecurity.RunWithElevatedPrivileges()是用来提高操作权限级别来操作站点!

用法:

SPSecurity.RunWithElevatedPrivileges(delegate() {代码});提高权限将是让代码以sharepoint\system所具有的权限来执行!

更改指定的item代码

public string AddNewItem()        {            string retVal = string.Empty;            try            {                SPSecurity.RunWithElevatedPrivileges(delegate()                {                    using (SPSite site = new SPSite(SPContext.Current.Web.Url))                    {                        using (SPWeb web = site.OpenWeb())                        {                            SPList list = web.Lists["TEST"];                            SPListItem item = list.Items.Add();                            item["Title"] = string.Format("Test at {0}", DateTime.Now.ToString());                            item.Update();                        }                    }                    retVal = "operation  success!";                });            }            catch (Exception ex)            {                retVal += ex.Message;            }            return retVal;        }

如果修改的不留痕迹，要使用SystemUpdate;

示例如下:

public string AddNewItem()        {            string retVal = string.Empty;            try            {                SPSecurity.RunWithElevatedPrivileges(delegate()                {                    using (SPSite site = new SPSite(SPContext.Current.Web.Url))                    {                        using (SPWeb web = site.OpenWeb())                        {                            SPList list = web.Lists["TEST"];                            SPListItem item = list.Items.Add();                            item["Title"] = string.Format("Test at {0}", DateTime.Now.ToString());                            item.SystemUpdate();                        }                    }                    retVal = "operation  success!";                });            }            catch (Exception ex)            {                retVal += ex.Message;            }            return retVal;        }

在很多时候我们需要设置允许不安全的修改。使用这个AllowUnsafeUpdates.

示例如下:

public string AddNewItem()        {            string retVal = string.Empty;            try            {                SPSecurity.RunWithElevatedPrivileges(delegate()                {                    using (SPSite site = new SPSite(SPContext.Current.Web.Url))                    {                        using (SPWeb web = site.OpenWeb())                        {                            web.AllowUnsafeUpdates = true;                            SPList list = web.Lists["TEST"];                            SPListItem item = list.Items.Add();                            item["Title"] = string.Format("Test at {0}", DateTime.Now.ToString());                            item.SystemUpdate();                            web.AllowUnsafeUpdates = false;                        }                    }                    retVal = "operation  success!";                });            }            catch (Exception ex)            {                retVal += ex.Message;            }            return retVal;        }

在sharepoint里面删除一条item的话可以进行如下操作.

/// 
        ///         /// 
        /// 
            private SPList GetCurrentList()        {            using (SPSite siteCollection = new SPSite(SPContext.Current.Web.Url))            {                using (SPWeb web = siteCollection.OpenWeb())                {                    SPList list = web.Lists[this.ListName];                    return list;                }            }        }        /// 
        ///         /// 
        ///         ///         ///         public void DeleteItemByIDVersion(int id, int version, bool recycle)        {            SPListItem item = GetCurrentList().GetItemById(id);            if (recycle)            {                item.Versions.GetVersionFromID(version).Recycle();            }            else            {                item.Versions.GetVersionFromID(version).Delete();            }        }        /// 
        /// Property that holds the list name.        /// 
        public override string ListName        {            get { return "Test"; }        }

如果只取item的发布过的版本的数据，可以做如下处理.

private NewEntity GetLastApproveVersionByItem(SPListItem item)        {            NewEntity result = null;            if (item == null) return result;            if (item.Level == SPFileLevel.Published)            {                result = this.ConvertToEntity(item);            }            else if (item.Versions != null && item.Versions.Count > 0)            {                foreach (SPListItemVersion itemVersion in item.Versions)                {                    if (itemVersion.Level == SPFileLevel.Published)                    {                        result = this.ConvertToEntity(itemVersion);                        break;                    }                }            }            return result;        }

总结

sharepoint 对list的操作，主要有增加、删除和修改list里面的item数据，要注意的是这里打开的是当前操作的site。SPContext.Current.Web.Url取的是当前打开页面的值.

作者：

出处：

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