From:http://www.cnblogs.com/BruceLee521/

开始以为要构建

WindowsIdentity windowsIdentity = WindowsIdentity.GetCurrent();

GenericPrincipal genericPrincipal =new GenericPrincipal(genericIdentity, roles);

然后把HttpContext.Current.User 置成上面构造的。但发现在打开个人站点时出错。

然后修改个人站点C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\SiteTemplates\SPSPERS\default.aspx

加入

username:<%=HttpContext.Current.User.Identity.Name%>:
authen:<%=HttpContext.Current.User.Identity.AuthenticationType%>
authe:<%=HttpContext.Current.User.GetType().ToString()%>
identity:<%=HttpContext.Current.User.Identity.GetType().ToString()%>

运行发现页面输出

helloWORLD:sunsheng: authen:Forms authe:System.Web.Security.RolePrincipal identity:System.Web.Security.FormsIdentity

才知道构造用户错误，应该构造

System.Web.Security.RolePrincipal
System.Web.Security.FormsIdentity

于是写了类

public class MOSSFBAImpersonate
    {

//code sample by Ric
        //================
        //  MOSSFBAImpersonate mossFBAImpersonate = new MOSSFBAImpersonate(ConfigurationManager.AppSettings.Get("RoleProviderName"));
        // FBAIP.Impersonate([roleProvidernameFromWebconfig],[impersonatingUserName]);
        //  //to do you work here....
        //  FBAIP.Revoke();
        //================

#region public functions

public MOSSFBAImpersonate(string roleProviderName)
        {
            m_rolePrincipal = (IPrincipal)HttpContext.Current.User;
            m_roleProvider = roleProviderName;
            if (null == m_roleProvider)
                throw (new Exception("MOSSFBAImpersonate::roleProviderName is null!"));
        }
        public void Impersonate(string userName)
        {
            HttpContext.Current.User = this.CreateHttpUser(m_roleProvider, userName);
        }
        public void Revoke()
        {
            if (null != m_rolePrincipal)
                HttpContext.Current.User = (IPrincipal)m_rolePrincipal;
        }
        #endregion
        #region private region
        private object m_rolePrincipal = null;
        private string m_roleProvider = null;

private RolePrincipal CreateHttpUser(string roleProviderName, string userName)
        {
            GenericIdentity genericIdentity = new GenericIdentity(userName, "Forms");
            return new RolePrincipal(roleProviderName, genericIdentity);
        }
        #endregion
    }

来进行模拟用户

得到个人站点的代码可以如下：

public SPWeb GetPersonalWeb(string strAccount, string strPersonalSiteHost)
        {
            SPWeb myWeb = null;
            SPSite spPersonalSite = null;
            MOSSFBAImpersonate mossFBAImpersonate = new MOSSFBAImpersonate(ConfigurationManager.AppSettings.Get("RoleProviderName"));
            try
            {
                mossFBAImpersonate.Impersonate(strAccount);
                spPersonalSite = new SPSite(strPersonalSiteHost);
                myWeb = spPersonalSite.RootWeb;
                mossFBAImpersonate.Revoke();
            }
            catch (System.Threading.ThreadAbortException thex)
            {
                throw thex;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
               //myWeb.Dispose(); //which will be disposed by outside caller.
                spPersonalSite.Dispose();
            }
            return myWeb;
        }