MongoDB简单的增删改

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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using MongoDB.Driver;using MongoDB.Bson;namespace MongoDBTest{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();            Init();        }        private void Init()        {            // MongoDB连接串，以[mongodb://]开头这里，我们连接的是本机的服务            string connectionString = "mongodb://localhost:27017";            // 连接到一个MongoServer上            MongoServer server = MongoServer.Create(connectionString);            // -------------------------------------------------------------------------            // 打开数据库testdb            MongoDatabase db = server.GetDatabase("testdb");            // 获取集合employees            MongoCollection<BsonDocument> collection = db.GetCollection<BsonDocument>("employees");            // 创建一个employee            BsonDocument employee = new BsonDocument             {                { "name", "Ernest Hemingway" },                { "title", "For Whom the Bell Tolls" },                { "sex", "man" }            };            //             collection.Insert(employee);            //一次插入多条            //MongoCollection<BsonDocument> books;            //BsonDocument[] batch = {            //    new BsonDocument {            //        { "author", "Kurt Vonnegut" },            //        { "title", "Cat's Cradle" }            //    },            //    new BsonDocument {            //        { "author", "Kurt Vonnegut" },            //        { "title", "Slaughterhouse-Five" }            //    }            //};            //books.InsertBatch(batch);            // 查询上面那个刚刚插进去的数据            var query = new QueryDocument("sex", "man");            //保存            BsonDocument book = collection.FindOne(query);            if (book != null)            {                book["title"] = "Cat's Cradle";                collection.Save(book);            }            //修改            //MongoCollection<BsonDocument> books;            //var query = new QueryDocument {            //    { "author", "Kurt Vonnegut" },            //    { "title", "Cats Craddle" }            //};            //            var update = new UpdateDocument {            //    { "$set", new BsonDocument("title", "Cat's Cradle") }            //};            //BsonDocument updatedBook = books.Update(query, update);            // 遍历结果            foreach (BsonDocument emp in collection.Find(query))            {                string str = string.Format("name:{0}\ttitle:{1}\tsex:{2}", emp["name"].AsString,                    emp["title"].ToString(),emp["sex"].AsString);                // BsonValue有两种取值方式，下面两个都用了一个是AsXXX,一个是ToXXX()                MessageBox.Show(str);            }        }    }}
---Mongodb文档.
http://www.mongodb.org/display/DOCS/CSharp+Driver+Tutorial#CSharpDriverTutorial-FindOneandFindOneAsmethods