封装MongoDB的 asp.net 链接类

using System;
using System.Collections.Generic;
using System.Linq;
using MongoDB;

/// <summary>
/// 对Mongo和MongoDatabase的包装类
/// </summary>
public class MyMongoDb : IDisposable
{
private Mongo _mongo;
private IMongoDatabase _db;
private static string connectionString = "Server=127.0.0.1;mydb";
private static readonly string _connectionString = connectionString.Split(';')[0];// "Server=127.0.0.1";
private static readonly string _dbName = connectionString.Split(';')[1];

public MyMongoDb()
: this(_connectionString, _dbName)
{
}

public MyMongoDb(string dbName)
: this(_connectionString, dbName)
{
}

/// <summary>
/// 构造函数。根据指定连接字符串和数据库名
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="dbName">数据库名，可为空，但必须在任何操作数据库之前要调用UseDb()方法</param>
public MyMongoDb(string connectionString, string dbName)
{
if( string.IsNullOrEmpty(connectionString) )
throw new ArgumentNullException("connectionString");

_mongo = new Mongo(connectionString);

// 立即连接 MongoDB
_mongo.Connect();

if( string.IsNullOrEmpty(dbName) == false )
_db = _mongo.GetDatabase(dbName);
}

/// <summary>
/// 切换到指定的数据库
/// </summary>
/// <param name="dbName"></param>
/// <returns></returns>
public IMongoDatabase UseDb(string dbName)
{
if( string.IsNullOrEmpty(dbName) )
throw new ArgumentNullException("dbName");

_db = _mongo.GetDatabase(dbName);
return _db;
}

/// <summary>
/// 获取当前连接的数据库
/// </summary>
public IMongoDatabase CurrentDb
{
get
{
if( _db == null )
throw new Exception("当前连接没有指定任何数据库。请在构造函数中指定数据库名或者调用UseDb()方法切换数据库。");

return _db;
}
}

/// <summary>
/// 获取当前连接数据库的指定集合【依据类型】
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public IMongoCollection<T> GetCollection<T>() where T : class
{
return this.CurrentDb.GetCollection<T>();
}

/// <summary>
/// 获取当前连接数据库的指定集合【根据指定名称】
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="name">集合名称</param>
/// <returns></returns>
public IMongoCollection<T> GetCollection<T>(string name) where T : class
{
return this.CurrentDb.GetCollection<T>(name);
}

public void Dispose()
{
if( _mongo != null ) {
_mongo.Dispose();
_mongo = null;
}
}
}

使用封装类

public void Insert(USER user)
{
using (MyMongoDb mdb = new MyMongoDb())
{
var collection = mdb.GetCollection<USER>();

collection.Insert(user);
}
}