MongoDB C# Driver 使用樣本 (2.2)

項目update到了mongoDB C# driver 2.2 ， 發現從1.9到2.0的變化還是很大的，整合了一些常用的操作附加demo代碼：

  class Program    {        const string CollectionName = "video";        static void Main(string[] args)        {            // remove the demo collection then recreate later            db.GetCollection<Video>(CollectionName).Database.DropCollection(CollectionName);            var videos = new List<Video>            {                new Video { Title="The Perfect Developer",                             Category="SciFi", Minutes=118 },                new Video { Title="Lost In Frankfurt am Main",                             Category="Horror", Minutes=122 },                 new Video { Title="The Infinite Standup",                             Category="Horror", Minutes=341 }             };            Console.WriteLine("Insert Videos ...");            db.GetCollection<Video>(CollectionName).InsertMany(videos);            Console.WriteLine("[After insert] All Videos : ");            var all = db.GetCollection<Video>(CollectionName).Find(x=>x.Title != string.Empty).ToList();            foreach (var v in all)            {                Console.WriteLine(v);            }            Console.WriteLine("Group By...");            var groupby = db.GetCollection<Video>(CollectionName).Aggregate()                    .Group(x => x.Category, g => new {Name = g.Key, Count = g.Count(), TotalMinutes = g.Sum(x => x.Minutes)})                    .ToList();            foreach (var v in groupby)            {                Console.WriteLine(v.Name + "," + v.Count + "," + v.TotalMinutes);            }            Console.WriteLine("Updating One [Title = The Perfect Developer]...");            // updating title with "The perfect developer" video's 'title' and 'minute'            db.GetCollection<Video>(CollectionName).FindOneAndUpdate(x=>x.Title == "The Perfect Developer",                    Builders<Video>.Update.Set(x=> x.Title , "A Perfect Developer [updated]")                                          .AddToSet(x => x.Comments, "good video!")                                          .AddToSet(x => x.Comments, "not bad"));            Console.WriteLine("[After Updating One] All Videos : ");            all = db.GetCollection<Video>(CollectionName).Find(x => x.Title != string.Empty).ToList();            foreach (var v in all)            {                Console.WriteLine(v);            }            Console.WriteLine("Deleting One... [Minutes = 122]");            db.GetCollection<Video>(CollectionName).DeleteOne(x => x.Minutes == 122);            Console.WriteLine("[After Deleting One] All Videos : ");            all = db.GetCollection<Video>(CollectionName).Find(x => x.Title != string.Empty).ToList();            foreach (var v in all)            {                Console.WriteLine(v);            }            Console.Read();        }        private static IMongoDatabase db        {            get            {                var url = new MongoUrl(ConfigurationSettings.AppSettings["mongoUrl"]);                var client = new MongoClient(url);                return client.GetDatabase(url.DatabaseName);            }        }    }    [BsonIgnoreExtraElements]    public class Video    {        public Video()        {            Comments = new List<string>();        }        [BsonId]        [BsonRepresentation(BsonType.ObjectId)]        public string Id { get; set; }        public string Title { get; set; }        public string Category { get; set; }        public int Minutes { get; set; }        public IList<string> Comments { get; set; }        public override string ToString()        {            return string.Format("{0} - {1} - {2}", Title, Category, Minutes);        }    }

對於mongoDB C# driver從1.9到2.0的更新，簡化了資料庫的串連方式，簡化了Find,Update,Delete的介面，group by和projection操作也更流暢了。
在Builders<T>中整合了 update, filter, projection, 和sort，功能的內聚性更強了，找function很方便。

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