MongoDB入门教程之C#驱动操作实例

作为系列的最后一篇，得要说说C#驱动对mongodb的操作，目前驱动有两种：官方驱动和samus驱动，不过我个人还是喜欢后者，

因为提供了丰富的linq操作，相当方便。

官方驱动：https://github.com/mongodb/mongo-csharp-driver/downloads。下载后，还提供了一个酷似msdn的帮助文档。

samus驱动：https://github.com/samus/mongodb-csharp/downloads。

下面就具体看看samus驱动，https://github.com/samus/mongodb-csharp/blob/master/examples/Simple/Main.cs上面提供了

一个简单的demo，大体上看看我们就知道怎么玩了。

一： 实践

1：我们建立一个Person实体，MongoAlias特性表示取别名，这里的ID值将会覆盖掉数据库自动生成的_id。

#region 数据实体

    /// <summary>

/// 数据实体

/// </summary>

    public class Person

    {

        [MongoAlias("_id")]

        public string ID { get; set; }
        public string Name { get; set; }

        public int Age { get; set; }

        public DateTime CreateTime { get; set; }

    }

    #endregion

2：初始化一些变量

string connectionString = string.Empty;
        string databaseName = string.Empty;

        string collectionName = string.Empty;

        static MongodbHelper<T> mongodb;

        #region 初始化操作

/// <summary>

/// 初始化操作

/// </summary>

        public MongodbHelper()

        {

            connectionString = "Server=127.0.0.1:2222";

            databaseName = "shopex";

            collectionName = "person";

        }

        #endregion

3：为了方便T的继承类使用linq功能，我们还需要映射一下。

#region 实现linq查询的映射配置

        /// <summary>

/// 实现linq查询的映射配置

/// </summary>

        public MongoConfiguration configuration

        {

            get

            {

                var config = new MongoConfigurationBuilder();
                config.Mapping(mapping =>

                {

                    mapping.DefaultProfile(profile =>

                    {

                        profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));

                    });

                    mapping.Map<T>();

                    mapping.Map<T>();

                });
                config.ConnectionString(connectionString);

                return config.BuildConfiguration();

            }

        }

        #endregion

4：下面是一些基本的CURD的代码，跟写EF代码很类似，写起来好舒服。

#region 插入操作

        /// <summary>

/// 插入操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Insert(T t)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Insert(t, true);

                    mongo.Disconnect();

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 更新操作

        /// <summary>

/// 更新操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Update(T t, Expression<Func<T, bool>> func)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Update<T>(t, func, true);

                    mongo.Disconnect();

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 获取集合

        /// <summary>

///获取集合

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)

        {

            pageCount = 0;
            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    pageCount = Convert.ToInt32(collection.Count());

                    var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))

                                                   .Take(pageSize).Select(i => i).ToList();
                    mongo.Disconnect();

                    return personList;

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 读取单条记录

        /// <summary>

///读取单条记录

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public T Single(Expression<Func<T, bool>> func)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    var single = collection.Linq().FirstOrDefault(func);

                    mongo.Disconnect();

                    return single;

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 删除操作

        /// <summary>

/// 删除操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Delete(Expression<Func<T, bool>> func)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    //这个地方要注意，一定要加上T参数，否则会当作object类型处理

//导致删除失败

                    collection.Remove<T>(func);
                    mongo.Disconnect();

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion

5. 好，我们开一下2222端口，由于前前篇我已经把这个mongodb做成了服务，现在就直接连过去了，并做一下对Name的索引。


6. 一切准备妥当，我们做下基本的操作，比如这里我添加一千条数据，注意我开启的是安全模式，如果插入不成功，将会抛出异常。

<1> Add:

static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();
            //插入1000条数据

            for (int i = 0; i < 1000; i++)

            {

                helper.Insert(new Person()

                {

                    ID = Guid.NewGuid().ToString(),

                    Name = "jack" + i,

                    Age = i,

                    CreateTime = DateTime.Now

                });

            }
            Console.WriteLine("插入成功");

            Console.Read();

        }

乍一看显示的数据以为有问题，为什么没有出现jack0或者jack999，不过find的一下后心情舒坦了。

<2> update: 这里就把jack941的名字改掉“mary”

static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();
            //修改jack941改成mary

            var single = helper.Single(i => i.Name == "jack941");

            single.Name = "mary";

            helper.Update(single, i => i.ID == single.ID);
            Console.WriteLine("修改成功");

            Console.Read();

        }

<3>Delete： 删除mary这条记录

static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();
            //删除mary这个记录

            helper.Delete(i => i.Name == "mary");
            Console.WriteLine("删除成功");

            Console.Read();

        }

<4> list操作： 这里我获取一下名字里面带9的人数列表

static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();
            int pagecount;

            //获取名字里面带9的人数

            var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);
           Console.Read();

        }

总的运行代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;

using System.Linq.Expressions;
using MongoDB.Configuration;

using MongoDB.Linq;

using MongoDB.Attributes;
namespace MongoDB.Test

{

    public class MongodbHelper<T> where T : class

    {

        string connectionString = string.Empty;
        string databaseName = string.Empty;

        string collectionName = string.Empty;

        static MongodbHelper<T> mongodb;

        #region 初始化操作

        /// <summary>

/// 初始化操作

/// </summary>

        public MongodbHelper()

        {

            connectionString = "Server=127.0.0.1:2222";

            databaseName = "shopex";

            collectionName = "person";

        }

        #endregion
        #region 实现linq查询的映射配置

        /// <summary>

/// 实现linq查询的映射配置

/// </summary>

        public MongoConfiguration configuration

        {

            get

            {

                var config = new MongoConfigurationBuilder();
                config.Mapping(mapping =>

                {

                    mapping.DefaultProfile(profile =>

                    {

                        profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));

                    });

                    mapping.Map<T>();

                    mapping.Map<T>();

                });
                config.ConnectionString(connectionString);

                return config.BuildConfiguration();

            }

        }

        #endregion
        #region 插入操作

        /// <summary>

/// 插入操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Insert(T t)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Insert(t, true);

                    mongo.Disconnect();

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 更新操作

        /// <summary>

/// 更新操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Update(T t, Expression<Func<T, bool>> func)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Update<T>(t, func, true);

                    mongo.Disconnect();

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 获取集合

        /// <summary>

///获取集合

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)

        {

            pageCount = 0;
            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    pageCount = Convert.ToInt32(collection.Count());

                    var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))

                                                   .Take(pageSize).Select(i => i).ToList();
                    mongo.Disconnect();

                    return personList;

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 读取单条记录

        /// <summary>

///读取单条记录

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public T Single(Expression<Func<T, bool>> func)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    var single = collection.Linq().FirstOrDefault(func);

                    mongo.Disconnect();

                    return single;

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion
        #region 删除操作

        /// <summary>

/// 删除操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Delete(Expression<Func<T, bool>> func)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    //这个地方要注意，一定要加上T参数，否则会当作object类型处理

//导致删除失败

                    collection.Remove<T>(func);
                    mongo.Disconnect();

                }

                catch (Exception)

                {

                    mongo.Disconnect();

                    throw;

                }

            }

        }

        #endregion

    }
    #region 数据实体

    /// <summary>

/// 数据实体

/// </summary>

    public class Person

    {

        [MongoAlias("_id")]

        public string ID { get; set; }
        public string Name { get; set; }

        public int Age { get; set; }

        public DateTime CreateTime { get; set; }

    }

    #endregion

}