C#操作MongoDB帮助类

/// <summary>
/// 获取数据库实例对象
/// </summary>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <returns>数据库实例对象</returns>
private static MongoDatabase GetDatabase(string connectionString, string dbName)
{
var server = MongoServer.Create(connectionString);
return server.GetDatabase(dbName);
}

/// <summary>
/// 插入一条记录
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="model">数据对象</param>
public static void Insert<T>(string connectionString, string dbName, string collectionName, T model) where T : EntityBase
{
if (model == null)
{
throw new ArgumentNullException("model", "待插入数据不能为空");
}
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection<T>(collectionName);
collection.Insert(model);
}

/// <summary>
/// 更新数据
/// </summary>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="query">查询条件</param>
/// <param name="dictUpdate">更新字段</param>
public static void Update(string connectionString, string dbName, string collectionName, IMongoQuery query, 
Dictionary<string, BsonValue> dictUpdate)
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection(collectionName);
var update = new UpdateBuilder();
if (dictUpdate != null && dictUpdate.Count > 0)
{
foreach (var item in dictUpdate)
{
update.Set(item.Key, item.Value);
}
}
collection.Update(query, update, UpdateFlags.Multi);
}

/// <summary>
/// 更新数据
/// </summary>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="query">查询条件</param>
/// <param name="update">更新条件</param>
public static void Update(string connectionString, string dbName, string collectionName, IMongoQuery query,
IMongoUpdate update)
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection(collectionName);
collection.Update(query, update, UpdateFlags.Multi);
}

/// <summary>
/// 根据ID获取数据对象
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="id">ID</param>
/// <returns>数据对象</returns>
public static T GetById<T>(string connectionString, string dbName, string collectionName, string id)
where T : EntityBase
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection<T>(collectionName);
var tId = new ObjectId(id);
return collection.FindOneById(tId);
}

/// <summary>
/// 根据查询条件获取一条数据
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="query">查询条件</param>
/// <returns>数据对象</returns>
public static T GetOneByCondition<T>(string connectionString, string dbName, 
string collectionName, IMongoQuery query)
where T : EntityBase
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection<T>(collectionName);
return collection.FindOne(query);
}

/// <summary>
/// 根据查询条件获取多条数据
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="query">查询条件</param>
/// <returns>数据对象集合</returns>
public static List<T> GetManyByCondition<T>(string connectionString, string dbName, 
string collectionName, IMongoQuery query)
where T : EntityBase
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection<T>(collectionName);
return collection.Find(query).ToList();
}

/// <summary>
/// 根据查询条件获取多条数据（分页）
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="query">查询条件</param>
/// <param name="sortBy">排序</param>
/// <param name="pageIndex">页号</param>
/// <param name="pageSize">每页大小</param>
/// <returns>分页数据集合</returns>
public static PagingList<T> GetManyByPageCondition<T>(string connectionString, string dbName,
string collectionName, IMongoQuery query, IMongoSortBy sortBy, int pageIndex, int pageSize)
where T : EntityBase
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection<T>(collectionName);
var result = new PagingList<T>();
result.Total = (int)collection.Count(query);
result.CurrentPageList =
collection.Find(query).SetSortOrder(sortBy).SetSkip((pageIndex - 1)*pageSize).SetLimit(pageSize).ToList();
return result;
}

/// <summary>
/// 获取集合中的所有数据
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <returns>数据对象集合</returns>
public static List<T> GetAll<T>(string connectionString, string dbName, string collectionName)
where T : EntityBase
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection<T>(collectionName);
return collection.FindAll().ToList();
}

/// <summary>
/// 删除集合中符合条件的数据
/// </summary>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
/// <param name="query">查询条件</param>
public static void DeleteByCondition(string connectionString, string dbName, 
string collectionName, IMongoQuery query)
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection(collectionName);
collection.Remove(query);
}

/// <summary>
/// 删除集合中的所有数据
/// </summary>
/// <param name="connectionString">数据库连接串</param>
/// <param name="dbName">数据库名称</param>
/// <param name="collectionName">集合名称</param>
public static void DeleteAll(string connectionString, string dbName, string collectionName)
{
var db = GetDatabase(connectionString, dbName);
var collection = db.GetCollection(collectionName);
collection.RemoveAll();
}