SharePoint中低权限用户通过提升权限创建用户组

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/// <summary>         /// 提升权限创建用户组         /// </summary>         /// <param name="groupname">用户组的名字</param>         public void CreateGroup(string groupname)         {             SPSecurity.RunWithElevatedPrivileges(delegate()             {                 try                 {                     using (SPSite mySite = new SPSite(SPContext.Current.Site.ID))                     {                         using (SPWeb myWeb = mySite.OpenWeb())                         {                             myWeb.AllowUnsafeUpdates = true;                             myWeb.SiteGroups.Add(groupname, myWeb.CurrentUser, null, "");                             myWeb.AllowUnsafeUpdates = false;                         }                     }                 }                 catch (Exception ex)                 {                     //throw custom exception