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。

复制代码 代码如下:

#region 数据实体

///

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

复制代码 代码如下:

string connectionString = string.Empty;

string databaseName = string.Empty;

string collectionName = string.Empty;

static MongodbHelper mongodb;

#region 初始化操作

///

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。

复制代码 代码如下:

#region 实现linq查询的映射配置

///

public MongoConfiguration configuration

{

get

{

var config = new MongoConfigurationBuilder();

config.Mapping(mapping =>

{

mapping.DefaultProfile(profile =>

{

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

});

mapping.Map();

mapping.Map();

});

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。

复制代码 代码如下:

#region 插入操作

///

///

///

public void Insert(T t)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(collectionName);

collection.Insert(t, true);

mongo.Disconnect();

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

#region 更新操作

///

///

///

public void Update(T t, Expression> func)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(collectionName);

collection.Update(t, func, true);

mongo.Disconnect();

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

#region 获取集合

///

///

///

public List List(int pageIndex, int pageSize, Expression> func, out int pageCount)

{

pageCount = 0;

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(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

///

///

///

public T Single(Expression> func)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(collectionName);

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

mongo.Disconnect();

return single;

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

#region 删除操作

///

///

///

public void Delete(Expression> func)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(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(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:

复制代码 代码如下:

static void Main(string[] args)

{

MongodbHelper helper = new MongodbHelper();

//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”

复制代码 代码如下:

static void Main(string[] args)

{

MongodbHelper helper = new MongodbHelper();

//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

复制代码 代码如下:

static void Main(string[] args)

{

MongodbHelper helper = new MongodbHelper();

//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

复制代码 代码如下:

static void Main(string[] args)

{

MongodbHelper helper = new MongodbHelper();

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

复制代码 代码如下:

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 where T : class

{

string connectionString = string.Empty;

string databaseName = string.Empty;

string collectionName = string.Empty;

static MongodbHelper mongodb;

#region 初始化操作

///

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

///

public MongoConfiguration configuration

{

get

{

var config = new MongoConfigurationBuilder();

config.Mapping(mapping =>

{

mapping.DefaultProfile(profile =>

{

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

});

mapping.Map();

mapping.Map();

});

config.ConnectionString(connectionString);

return config.BuildConfiguration();

}

}

#endregion

#region 插入操作

///

///

///

public void Insert(T t)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(collectionName);

collection.Insert(t, true);

mongo.Disconnect();

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

#region 更新操作

///

///

///

public void Update(T t, Expression> func)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(collectionName);

collection.Update(t, func, true);

mongo.Disconnect();

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

#region 获取集合

///

///

///

public List List(int pageIndex, int pageSize, Expression> func, out int pageCount)

{

pageCount = 0;

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(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

///

///

///

public T Single(Expression> func)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(collectionName);

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

mongo.Disconnect();

return single;

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

#region 删除操作

///

///

///

public void Delete(Expression> func)

{

using (Mongo mongo = new Mongo(configuration))

{

try

{

mongo.Connect();

var db = mongo.GetDatabase(databaseName);

var collection = db.GetCollection(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(func);

mongo.Disconnect();

}

catch (Exception)

{

mongo.Disconnect();

throw;

}

}

}

#endregion

}

#region 数据实体

///

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

}