SharePoint中的"用户或用户组"栏

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//从SPListItem中取SPUser方法、代码

处理Sharepoint中的SPListItem时，有时需要获得这个对象的"Created By"(创建者)，并且希望是SPUser类型，而不是string，这样可以进而得到该用户的权限、ID等等。

  

"Person or Group"(用户或组)对应的类型是SPFieldUser，怎么把SPFieldUser转成SPUser呢？

  

网上找了些资料，发现要获得SPUser需要借助SPFieldUserValue，借鉴了一些代码，自己试了试，写了一个通用的方法：

  

   

   

         SPUser GetSPUserFromSPListItemByFieldName(SPListItem spItem,stringfieldName)

  

        {

  

            stringuserName = spItem[fieldName].ToString();

  

            SPFieldUser _user = (SPFieldUser)spItem.Fields[fieldName];

  

            SPFieldUserValue userValue = (SPFieldUserValue)_user.GetFieldValue(userName);

  

            returnuserValue.User;

  

        }

  

   

   

   

   

//SharePoint中的"用户或用户组"栏,当选择了"允许多重选择"后,用对象模型SPListItemCollection["栏名"]获得到的是SPFieldUserValueCollection的对象:

SPFieldUserValueCollection users = SPListItem["栏名"]as SPFieldUserValueCollection;

如果将SPListItemCollection["栏名"]输入字符串的话,是"用户ID;#用户Name",

 一　为栏赋值有这几种方式,

SPListItem["栏名"] = SPUser实例或者SPGroup实例,但是不能赋SPUserCollection;

SPListItem["栏名"] ="用户ID;#用户Name;#用户ID;#用户Name......";

SPListItem["栏名"] = SPFieldUserValueCollection实例;(当栏设置允许多重选择为否时,赋的值都是集合中的第一个)

SPListItem["栏名"] = SPFieldUserValue实例;

 二　获取栏的值

当栏设置为"允许多重选择"为否时,不管用SPFieldUserValueCollection userValues=item["栏名"]as SPFieldUserValueCollection;还是SPFieldUserValue userValue = item["栏名"]as SPFieldUserValue;得到的值都是Null;

如果想判断是否选择了"允许多重选择",可以先查看SPFieldUser字段的AllowMutipleValues属性.不过真麻烦.

实际上在该字段在"允许多重选择"为否时,字段类型是string,为是时,字段类型是SPFieldUserValueCollection.

          protectedvoid btnOK_Click(objectsender, EventArgs e)

        {

            ArrayList list = PeopleEditor1.ResolvedEntities;

            stringmsgTo = "";

            //获取id和显示名称

            foreach(Microsoft.SharePoint.WebControls.PickerEntity p in list)

            {

                stringuserId = p.EntityData["SPUserID"].ToString();

                msgTo += userId +"#";

            }

            //获取帐号

            ArrayList selectedAccoutList = PeopleEditor1.Accounts;

            stringselectedAccouts2 = PeopleEditor1.CommaSeparatedAccounts;

            SPSecurity.RunWithElevatedPrivileges(delegate()

            {

  

                if(msgTo != "")

                {

                    for(inti = 0; msgTo.Length > 1; i++)

                    {

                        stringlassmsgto = string.Empty;

                        lassmsgto = msgTo.Substring(msgTo.IndexOf("#") + 1);

                        msgTo = msgTo.Substring(0, msgTo.IndexOf("#"));

                        SPSite site =newSPSite(SPContext.Current.Site.Url);

                        SPWeb web = site.RootWeb;

                        .AllowUnsafeUpdates =true;

                        web.AllowUnsafeUpdates =true;

                        SPListItem item = web.Lists["Messageboard"].Items.Add();

                        item["ToNameID"] = msgTo;

                        item["Content"] =this.txtContent.Text.Trim();

                        item["Title"] =this.txtTitle.Text.Trim();

                        SPFieldUserValue userValue =newSPFieldUserValue(web,msgTo);

                        item["ToName"] = userValue;

                         

                                           item.Update();

                        web.AllowUnsafeUpdates =false;

                        site.AllowUnsafeUpdates =false;

                        msgTo = lassmsgto;

  

                    }

                }

  

            });

            GridView1Show();

        }