C#Sharepoint获取当前用户的运行代码

我有教程中的代码，代码运行在域\AppPoolAccount下的WCF服务上

但代码除了拒绝访问外，如何确定用户

using (SPSite site = new SPSite("http://portal.local"))
            {
                SPServiceContext serviceContext = SPServiceContext.GetContext(site);


                UserProfileManager userProfileMgr = new UserProfileManager(serviceContext);
                ProfilePropertyManager profilePropMgr = new UserProfileConfigManager(serviceContext).ProfilePropertyManager;

                // Retrieve all properties for the "UserProfile" profile subtype,
                // and retrieve the property values for a specific user.
                ProfileSubtypePropertyManager subtypePropMgr = profilePropMgr.GetProfileSubtypeProperties("UserProfile");
                UserProfile userProfile = userProfileMgr.GetUserProfile(accountName);
                IEnumerator<ProfileSubtypeProperty> userProfileSubtypeProperties = subtypePropMgr.GetEnumerator();
                while (userProfileSubtypeProperties.MoveNext())
                {
                    string propName = userProfileSubtypeProperties.Current.Name;
                    ProfileValueCollectionBase values = userProfile.GetProfileValueCollection(propName);
                    if (values.Count > 0)
                    {

                        // Handle multivalue properties.
                        foreach (var value in values)
                        {
                            Console.WriteLine(propName + ": " + value.ToString());
                        }
                    }
                    else
                    {
                        Console.WriteLine(propName + ": ");
                    }
                }
                Console.WriteLine("Press Enter to change the values.");
                Console.Read();

                // Change the value of a single-value user property.
                userProfile[PropertyConstants.Department].Value = "SDDDD";
                userProfile.Commit();


            }

使用（SPSite站点=新SPSite（“http://portal.local"))
{
SPServiceContext serviceContext=SPServiceContext.GetContext（站点）；
UserProfileManager userProfileMgr=新的UserProfileManager（serviceContext）；
ProfilePropertyManager profilePropMgr=新用户ProfileConfigManager（serviceContext）；
//检索“UserProfile”配置文件子类型的所有属性，
//并检索特定用户的属性值。
ProfileSubtyPropertyManager SubtyPropMgr=profilePropMgr.GetProfileSubtyProperties（“UserProfile”）；
UserProfile UserProfile=userProfileMgr.GetUserProfile（accountName）；
IEnumerator UserProfileSubjectProperties=SubsubjectPropMgr.GetEnumerator（）；
while（userProfileSubjectProperties.MoveNext（））
{
string propName=UserProfileSubjectProperties.Current.Name；
ProfileValueCollectionBase values=userProfile.GetProfileValueCollection（propName）；
如果（values.Count>0）
{
//处理多值属性。
foreach（值中的var值）
{
Console.WriteLine（propName+“：“+value.ToString（））；
}
}
其他的
{
Console.WriteLine（propName+“：”）；
}
}
WriteLine（“按Enter键更改值”）；
Console.Read（）；
//更改单值用户属性的值。
userProfile[PropertyConstants.Department].Value=“SDDDD”；
Commit（）；
}

如何确定用户？

用于确定当前用户：

using (SPSite site = new SPSite("http://portal.local"))
            {
                SPServiceContext serviceContext = SPServiceContext.GetContext(site);


                UserProfileManager userProfileMgr = new UserProfileManager(serviceContext);
                ProfilePropertyManager profilePropMgr = new UserProfileConfigManager(serviceContext).ProfilePropertyManager;

                // Retrieve all properties for the "UserProfile" profile subtype,
                // and retrieve the property values for a specific user.
                ProfileSubtypePropertyManager subtypePropMgr = profilePropMgr.GetProfileSubtypeProperties("UserProfile");
                UserProfile userProfile = userProfileMgr.GetUserProfile(accountName);
                IEnumerator<ProfileSubtypeProperty> userProfileSubtypeProperties = subtypePropMgr.GetEnumerator();
                while (userProfileSubtypeProperties.MoveNext())
                {
                    string propName = userProfileSubtypeProperties.Current.Name;
                    ProfileValueCollectionBase values = userProfile.GetProfileValueCollection(propName);
                    if (values.Count > 0)
                    {

                        // Handle multivalue properties.
                        foreach (var value in values)
                        {
                            Console.WriteLine(propName + ": " + value.ToString());
                        }
                    }
                    else
                    {
                        Console.WriteLine(propName + ": ");
                    }
                }
                Console.WriteLine("Press Enter to change the values.");
                Console.Read();

                // Change the value of a single-value user property.
                userProfile[PropertyConstants.Department].Value = "SDDDD";
                userProfile.Commit();


            }

using (var site = new SPSite(siteUrl))
{
    using (var web = site.OpenWeb())
    {
        var currentUser = web.CurrentUser;
        //..

    }
}

---

currentUser为null，是否表示匿名？