moss用户管理

接触moss已经1年多了，但是一直都没有研究过本身的用户部分，前段时间做了几个实验，下面是代码：

　　/// <summary>
    /// 把域用户添加到MOSS
    /// </summary>
    /// <param name="UserName">域用户名domain\user</param>
    /// <returns></returns>  
    public bool AddToMoss(DomainUser domainusers)
    {
        string _Domain = new OperateDomain().Domain;
        string siteurl = "";
        DomainUser duser = domainusers;
        string loginName = _Domain + "\\" + duser.UserId;
        try
        {
            SPSecurity.CodeToRunElevated elevatedGetSitesAndGroups = new SPSecurity.CodeToRunElevated(delegate()
            {
                siteurl = ConfigurationManager.AppSettings["SiteAddress"].ToString();
                SPSite site = new SPSite(@siteurl);
                SPWeb web = site.OpenWeb();

                SPUserCollection susers = web.SiteUsers;
                web.AllowUnsafeUpdates = true;

                if (!ExistMossUser(site, loginName))
                {
                    susers.Add(loginName, duser.Email, duser.UserName, "");

                    if (!web.HasUniqueRoleAssignments)
                    {
                        web.BreakRoleInheritance(true);
                    }

                    //给用户赋予权限
                    SPRoleDefinitionCollection roles = web.RoleDefinitions;
                    SPRoleDefinition role = roles["读取"];
                    SPUser user = susers[loginName];
                    SPRoleAssignment raUser = new SPRoleAssignment(user);
                    raUser.RoleDefinitionBindings.Add(role);
                    web.RoleAssignments.Add(raUser);
                    //LogManage.SaveInfo("OK");
                }
            });

            SPSecurity.RunWithElevatedPrivileges(elevatedGetSitesAndGroups);
            return true;
        }
        catch (Exception ex)
        {
            LogManage.SaveInfo(ex.ToString());
            return false;
        }
    }
    /// <summary>
    /// 从MOSS中删除用户
    /// </summary>
    /// <param name="domainusers"></param>
    /// <returns></returns>
    public bool DelUserFromMoss(DomainUser domainusers)
    {
        string _Domain = new OperateDomain().Domain;
        string siteurl = "";
        DomainUser duser = domainusers;
        string loginName = _Domain + "\\" + duser.UserId;
        try
        {
            SPSecurity.CodeToRunElevated elevatedGetSitesAndGroups = new SPSecurity.CodeToRunElevated(delegate()
            {
                siteurl = ConfigurationManager.AppSettings["SiteAddress"].ToString();
                SPSite site = new SPSite(@siteurl);
                SPWeb web = site.OpenWeb();
                web.AllowUnsafeUpdates = true;

                SPUserCollection susers = web.SiteUsers;
                if (ExistMossUser(site, loginName))
                {
                    susers.Remove(loginName);
                }
            });
            SPSecurity.RunWithElevatedPrivileges(elevatedGetSitesAndGroups);
            return true;
        }
        catch (Exception ex)
        {
            LogManage.SaveInfo(ex.ToString());
            return false;
        }
    }

 /// <summary>
    /// 判断网站中是否存在该用户
    /// </summary>
    /// <param name="site"></param>
    /// <param name="userName"></param>
    /// <returns></returns>
    public bool ExistMossUser(SPSite site, string userName)
    {
        try
        {           
            SPWeb web = site.OpenWeb();           
            SPUserCollection susers = web.SiteUsers;
           
            bool f = false;
            foreach (SPUser us in susers)
            {
                if (userName == us.LoginName)
                {
                    f = true;
                    break;
                }
            }
            //LogManage.SaveInfo(f.ToString());
            return f;
           
        }
        catch (Exception ex)
        {
            LogManage.SaveInfo(ex.ToString());
            return true;
        }
      //return false;
    }