如何在codebehind中更新dotnetnuke userprofile图像？

using DotNetNuke.Entities.Users;
using DotNetNuke.Services.FileSystem;

public void UpdateUserProfileImage(int userId, int fileId)
{
    var userInfo = UserController.GetUserById(PortalSettings.PortalId, userId);
    var fileInfo = FileManager.Instance.GetFile(fileId);

    if (userInfo != null && fileInfo != null)
    {
        userInfo.Profile.Photo = fileInfo.FileId.ToString();
        UserController.UpdateUser(PortalSettings.PortalId, userInfo);
    }
}

protected void UploadButton_Click(object sender, EventArgs e)
{
    if (UserFileUpload.HasFile)
    {
        var userId = PortalSettings.UserId;
        var fileId = FileManager.Instance.AddFile(UserFileUpload.PostedFile, UserFileUpload.PostedFile.FileName, PortalSettings.PortalId, UserInfo.UserID, "Profile Pictures");
        UpdateUserProfileImage(userId, fileId);
    }
}