public class Photo : IEquatablePhoto>
 {
  [Required]
  public string PhotoName { get; set; }


  [Required]
  public string PhotoDescription { get; set; }


  public string ServerPath { get; set; }


  public Photo() { }


  public Photo(string name, string desc)
  {
   PhotoName = name;
   PhotoDescription = desc;
  }


  public bool Equals(Photo other)
  {
   return string.Equals(PhotoName, other.PhotoName);
  }
 }
 
 
public interface IAlbumIterable
 {
  bool HasNext();
  Photo Current();
  Photo Next();
 } 
 
 
 public interface IPhotosAggregable
 {
  IAlbumIterable GetIterator();
 }


 public class AlbumIterator : IAlbumIterable
 {
  private Album collection;
  private int count;


  public AlbumIterator(Album album)
  {
   collection = album;
  }


  public Photo Current()
  {
   if (count  collection.Count)
    return collection[count++];
   else
    throw new IndexOutOfRangeException();
  }


  public bool HasNext()
  {
   if (count  collection.Count - 1)
    return true;
   else
    return false;
  }


  public Photo Next()
  {
   if (HasNext())
    return collection[++count];
   else
    throw new IndexOutOfRangeException();
  }
 } 
 public class Album : IPhotosAggregable
 {
  [BsonId]
  public ObjectId Id { get; set; }


  [Required]
  public string Name { get; set; }


  [Required]
  public string Description { get; set; }


  public string Owner { get; set; }
  public Photo TitlePhoto { get; set; }


  [BsonDateTimeOptions(Kind = DateTimeKind.Local,Representation =BsonType.DateTime)]
  public DateTime CreationTime { get; set; }
  public IListPhoto> Pictures { get; set; }


  public Album() { Pictures = new ListPhoto>(); TitlePhoto = new Photo(); }
  public Album(string name, string owner, Photo pic)
  {
   Name = name;
   Owner = owner;
   TitlePhoto = pic;
   Pictures = new ListPhoto>();
   TitlePhoto = new Photo();
  }


  public bool InsertPicture(Photo pic)
  {
   if (!Pictures.Contains(pic))
   {
    Pictures.Add(pic);
    return true;
   }
   else
    throw new ArgumentException();
  }


  public bool InsertPictures(ListPhoto> photos)
  {
   foreach(var photo in photos)
   {
    if (!Pictures.Contains(photo))
    {
     Pictures.Add(photo);
    }
    else
     throw new ArgumentException();
   }
   return true;
  }


  public bool RemovePicture(Photo pic)
  {
    Pictures.Remove(pic);
    return true;
  }


  public int Count
  {
   get { return Pictures.Count; }
  }


  public Photo this[int index]
  {
   get { return Pictures[index]; }
   set { Pictures[index] = value; }
  }


  public IAlbumIterable GetIterator()
  {
   return new AlbumIterator(this);
  }
 }

 public class MongoAlbumPerformer
 {
  protected static IMongoClient client;
  protected static IMongoDatabase database;
  private static IMongoCollectionAlbum> collection;
  private string collectionName;

  public MongoAlbumPerformer(string databaseName, string collectionName)
  {
   
   client = new MongoClient(ConfigurationManager.ConnectionStrings["mongoDB"].ConnectionString);
   database = client.GetDatabase(databaseName);
   this.collectionName = collectionName;
   collection = database.GetCollectionAlbum>(collectionName, new MongoCollectionSettings { AssignIdOnInsert = true });
  }

  public void SetCollection(string collectionName)
  {
   this.collectionName = collectionName;
   collection = database.GetCollectionAlbum>(collectionName);
  }

  public void CreateAlbum(Album album)
  {
   var document = new Album
   {
    Name = album.Name,
    Owner = HttpContext.Current.User.Identity.Name,
    Description = album.Description,
    CreationTime = DateTime.Now,
    TitlePhoto = album.TitlePhoto,
    Pictures = album.Pictures
   };

   collection.InsertOne(document);
  }

  public ListAlbum> GetAlbumsByUserName(string username)
  {
   var projection = BuildersAlbum>.Projection
    .Include(a => a.Name)
    .Include(a => a.Description)
    .Include(a => a.TitlePhoto)
    .Include(a=>a.CreationTime);

   var result = collection
    .Find(a => a.Owner == HttpContext.Current.User.Identity.Name)
    .ProjectAlbum>(projection).ToList();

   return result;
  }

  public Album GetPicturesByAlbumName(string albumName)
  {
   var projection = BuildersAlbum>.Projection
    .Include(a => a.Pictures);

   var result = collection
    .Find(a => a.Owner == HttpContext.Current.User.Identity.Name  a.Name == albumName)
    .ProjectAlbum>(projection).FirstOrDefault();

   return result;
  }

  public void UpdateAlbumAddPhoto(string albumName, Photo photo)
  {
   var builder = BuildersAlbum>.Filter;
   var filter = builder.Eq(f => f.Name, albumName)  builder.Eq(f => f.Owner, HttpContext.Current.User.Identity.Name);
   var result = collection.Find(filter).FirstOrDefault();

   if (result == null)
    throw new ArgumentException("No album of supplied name: {0}", albumName);
   else
   {
      var picture = new Photo
      {
       PhotoName = photo.PhotoName,
       PhotoDescription = photo.PhotoDescription,
       ServerPath = photo.ServerPath,
      };

      var update = BuildersAlbum>.Update.Push(a => a.Pictures, picture);
      collection.UpdateOne(filter, update, new UpdateOptions { IsUpsert=true });
   }
  }

  public void DeletePhotoFromAlbum(string albumName, string photoName)
  {
   var builder = BuildersAlbum>.Filter;
   var filter = builder.Eq(f => f.Name, albumName)  builder.Eq(f => f.Owner, HttpContext.Current.User.Identity.Name);
   var result = collection.Find(filter).SingleOrDefault();

   if (result == null)
    throw new ArgumentException("No album of supplied name: {0}", albumName);
   else
   {
    var update = BuildersAlbum>.Update
     .PullFilter(a => a.Pictures, BuildersPhoto>.Filter.Eq(p => p.PhotoName, photoName));
    long count = collection.UpdateOne(filter, update).MatchedCount;
   }
  }
 }public class ServerPathFinder
 {
  public string GetBase64ImageString(HttpPostedFileBase file)
  {
   string mime = Regex.Match(file.ContentType, @"(?=image/)\w+").Value;
   byte[] bytes = new byte[file.ContentLength];
   file.InputStream.Read(bytes, 0, file.ContentLength);
   return string.Format("data:image/{0};base64,{1}",mime, Convert.ToBase64String(bytes));
  }
 }

 public class AlbumController : Controller
 {
  MongoAlbumPerformer mongod = new MongoAlbumPerformer("test","albums");

  [HttpPost]
  public ActionResult AlbumPreview(Photo model, HttpPostedFileBase file, string albumName, string delete, string phot)
  {
   if (delete == "false")
   {
    if (file != null)
    {
     if (!file.ContentType.StartsWith("image"))
     {
      ModelState.AddModelError("file", "选择正确的格式照片！");
     }
     else
     {
      ServerPathFinder finder = new ServerPathFinder();
      model.ServerPath = finder.GetBase64ImageString(file);
     }

     if (ModelState.IsValid)
     {
      mongod.UpdateAlbumAddPhoto(albumName, model);
      ModelState.Clear();
     }
    }
   }
   else
   {
    mongod.DeletePhotoFromAlbum(albumName, phot);
    foreach(var error in ModelState.Values)
    {
     error.Errors.Clear();
    }
   }
   ViewBag.AlbumTitle = albumName;
   ViewBag.PhotoList = mongod.GetPicturesByAlbumName(albumName).Pictures;

   return View();
  }

  public ActionResult AlbumPreview(string Name)
  {
   var album = mongod.GetPicturesByAlbumName(Name);
   ViewBag.AlbumTitle = Name;
   ViewBag.PhotoList = album.Pictures;

   return View();
  }

  [HttpPost]
  public ActionResult Create(Album model, HttpPostedFileBase file)
  {
   if (!file.ContentType.StartsWith("image"))
   {
    ModelState.AddModelError("file", "选择正确的格式照片！");
   }
   else
   {
    ServerPathFinder finder = new ServerPathFinder();
    model.TitlePhoto.ServerPath = finder.GetBase64ImageString(file);    
   }

   if (ModelState.IsValid)
   {
    model.Owner = HttpContext.User.Identity.Name;
    mongod.CreateAlbum(model);
   }
   var albums = mongod.GetAlbumsByUserName(HttpContext.User.Identity.Name);
   ViewBag.Albums = albums;

   return View();
  }

  public ActionResult Create()
  {
   var albums = mongod.GetAlbumsByUserName(HttpContext.User.Identity.Name);
   ViewBag.Albums = albums;
   return View();
  }
 } 

@{
 ViewBag.Title = "Create";
}

h2>我的相册/h2>

@Html.Partial("_MyAlbums", (ListAlbum>)ViewBag.Albums)

@using (Html.BeginForm("Create", "Album", FormMethod.Post, new { enctype = "multipart/form-data" })) 
{
 @Html.AntiForgeryToken()
 
 div class="form-horizontal">
  h4>创建新相册： /h4>
  hr />
  @Html.ValidationSummary(true, "", new { @class = "text-danger" })
  div class="form-group">
   @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
   div class="col-md-10">
    @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
    @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
   /div>
  /div>

  div class="form-group">
   @Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
   div class="col-md-10">
    @Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } })
    @Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })
   /div>
  /div>

  div class="form-group">
   @Html.LabelFor(model => model.TitlePhoto, htmlAttributes: new { @class = "control-label col-md-2" })
   div class="col-md-10">
    input type="file" name="file" id="file" style="width: 100%;" data-val="true" data-val-required="要求标题图片."/>
    @Html.ValidationMessage("file",new { @class = "text-danger" })
   /div>
  /div>
  
  div class="form-group">
   div class="col-md-offset-2 col-md-10">
    input type="submit" value="Create" class="btn btn-default" />
   /div>
  /div>
 /div>
}

@section scripts{
 @Scripts.Render("~/bundles/jqueryval")

 script type="text/javascript">
  $('img').click(function (data) {

  });

 /script>
}AlbumPreview.cshtml
 @{
 ViewBag.Title = "AlbumPreview";
}

@using (Html.BeginForm("AlbumPreview", "Album", FormMethod.Post, new { enctype = "multipart/form-data"}))
{
 @Html.AntiForgeryToken()

 {Html.RenderPartial("_Preview", (ListPhoto>)ViewBag.PhotoList);}

 div class="form-horizontal">
  br />
  h4>添加新的照片：/h4>
  hr />
  @Html.ValidationSummary(true, "", new { @class = "text-danger" })

  div class="form-group">
   @Html.LabelFor(model => model.PhotoName, htmlAttributes: new { @class = "control-label col-md-2" })
   div class="col-md-10">
    @Html.EditorFor(model => model.PhotoName, new { htmlAttributes = new { @class = "form-control" } })
    @Html.ValidationMessageFor(model => model.PhotoName, "", new { @class = "text-danger" })
   /div>
  /div>

  div class="form-group">
   @Html.LabelFor(model => model.PhotoDescription, htmlAttributes: new { @class = "control-label col-md-2" })
   div class="col-md-10">
    @Html.EditorFor(model => model.PhotoDescription, new { htmlAttributes = new { @class = "form-control" } })
    @Html.ValidationMessageFor(model => model.PhotoDescription, "", new { @class = "text-danger" })
   /div>
  /div>

  div class="form-group">
   label class="control-label col-md-2">选择照片：/label>
   div class="col-md-10">
    input type="file" name="file" id="file" style="width: 100%;" data-val="true" data-val-required="请选择图像" />
    @Html.ValidationMessage("file", new { @class = "text-danger" })
   /div>
  /div>

  div class="form-group">
   div class="col-md-offset-2 col-md-10">
    input type="submit" value="Create" class="btn btn-default" />
   /div>
  /div>
 /div>
 input type="hidden" name="albumName" id="albumName" value="@ViewBag.AlbumTitle" />
 input type="hidden" name="delete" id="delete" value="false" />
 input type="hidden" name="phot" id="phot" value="sraka" />
}

@section scripts{
 @Scripts.Render("~/bundles/jqueryval")

 script type="text/javascript">
  $(document).ready(function () {
   var elements = document.getElementsByClassName("btn btn-xs btn-warning cancel");
   for (var i = 0, len = elements.length; i  len; i++) {
    elements[i].addEventListener("click", function () {
     $('#delete').val(true);
     var name = $(this).attr("id");
     $('#phot').val(name);
     $('#' + name).click();
    });
   }
  })
 /script>
}_Preview.cshtml
 @{
 ViewBag.Title = "_Preview";
}

h2>Album span style="color:royalblue;font-style:italic">@ViewBag.AlbumTitle/span>/h2>

div class="row">
@foreach (var photo in Model)
{
 div class="col-md-3">
  input type="submit" id="@photo.PhotoName" value="删除" class="btn btn-xs btn-warning cancel" style="text-align:center;float:right" />
  img src="@photo.ServerPath" class="img-responsive img-thumbnail col-md-3" style="width:100%;height:180px" />
  label style="text-align:center;width:100%">@Html.DisplayNameFor(phot=>phot.PhotoName): @photo.PhotoName/label>
  label style="text-align:center;width:100%;font-weight:100">@photo.PhotoDescription/label>
 /div>
}
/div>