C# MongoDB操作类

using Entity.MongoDBHelper;
using MongoDB.Bson;
using MongoDB.Driver;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using DAL.Interface;

namespace DAL.Implments
{
    public partial class MongoDBBaseDAL : IMongoDBBaseDAL
    {
        //private readonly MongoDataBaseContext _dbContext;
        private IMongoClient _client ;
        private IMongoDatabase _database ;

        public MongoDBBaseDAL(MongoDataBaseContext mongoDataBase)
        {
            _client = mongoDataBase._client;
            _database = mongoDataBase._database;
        }

        public IMongoDatabase GetDatabase()
        {
            return _database;
        }
        public IMongoCollection<T> GetClient<T>(string collName) where T : class, new()
        {
            return _database.GetCollection<T>(collName);
        }

        #region +Add 添加一条数据
        /// <summary>
        /// 添加一条数据
        /// </summary>
        /// <param name="t">添加的实体</param>
        /// <param name="host">mongodb连接信息</param>
        /// <returns></returns>
        public  int Add<T>(string collName, T t) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                client.InsertOne(t);
                return 1;
            }
            catch(Exception ex)
            {
                return 0;
            }
        }
        #endregion

        #region +AddAsync 异步添加一条数据
        /// <summary>
        /// 异步添加一条数据
        /// </summary>
        /// <param name="t">添加的实体</param>
        /// <param name="host">mongodb连接信息</param>
        /// <returns></returns>
        public  async Task<int> AddAsync<T>(string collName, T t) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                await client.InsertOneAsync(t);
                return 1;
            }
            catch
            {
                return 0;
            }
        }
        #endregion

        #region +InsertMany 批量插入
        /// <summary>
        /// 批量插入
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="t">实体集合</param>
        /// <returns></returns>
        public  int InsertMany<T>(string collName, List<T> t) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                client.InsertMany(t);
                return 1;
            }
            catch (Exception ex)
            {
                return 0;
            }
        }
        #endregion

        #region +InsertManyAsync 异步批量插入
        /// <summary>
        /// 异步批量插入
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="t">实体集合</param>
        /// <returns></returns>
        public  async Task<int> InsertManyAsync<T>(string collName, List<T> t) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                await client.InsertManyAsync(t);
                return 1;
            }
            catch
            {
                return 0;
            }
        }
        #endregion

        #region +Update 修改一条数据
        /// <summary>
        /// 修改一条数据
        /// </summary>
        /// <param name="t">添加的实体</param>
        /// <param name="host">mongodb连接信息</param>
        /// <returns></returns>
        public  UpdateResult Update<T>(string collName, T t, string id,bool isObjectId=true) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                //修改条件
                FilterDefinition<T> filter;
                if (isObjectId)
                {
                    filter = Builders<T>.Filter.Eq("_id", new ObjectId(id));
                }
                else
                {
                    filter = Builders<T>.Filter.Eq("_id", id);
                }
                //要修改的字段
                var list = new List<UpdateDefinition<T>>();
                foreach (var item in t.GetType().GetProperties())
                {
                    if (item.Name.ToLower() == "id") continue;
                    list.Add(Builders<T>.Update.Set(item.Name, item.GetValue(t)));
                }
                var updatefilter = Builders<T>.Update.Combine(list);
                return client.UpdateOne(filter, updatefilter);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region +UpdateAsync 异步修改一条数据
        /// <summary>
        /// 异步修改一条数据
        /// </summary>
        /// <param name="t">添加的实体</param>
        /// <param name="host">mongodb连接信息</param>
        /// <returns></returns>
        public  async Task<UpdateResult> UpdateAsync<T>(string collName, T t, string id,bool isObjectId) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                //修改条件
                FilterDefinition<T> filter;
                if (isObjectId)
                {
                    filter = Builders<T>.Filter.Eq("_id", new ObjectId(id));
                }
                else
                {
                    filter = Builders<T>.Filter.Eq("_id", id);
                }
                //要修改的字段
                var list = new List<UpdateDefinition<T>>();
                foreach (var item in t.GetType().GetProperties())
                {
                    if (item.Name.ToLower() == "id") continue;
                    list.Add(Builders<T>.Update.Set(item.Name, item.GetValue(t)));
                }
                var updatefilter = Builders<T>.Update.Combine(list);
                return await client.UpdateOneAsync(filter, updatefilter);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region +UpdateManay 批量修改数据
        /// <summary>
        /// 批量修改数据
        /// </summary>
        /// <param name="dic">要修改的字段</param>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">修改条件</param>
        /// <returns></returns>
        public  UpdateResult UpdateManay<T>(string collName, Dictionary<string, string> dic, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                T t = new T();
                //要修改的字段
                var list = new List<UpdateDefinition<T>>();
                foreach (var item in t.GetType().GetProperties())
                {
                    if (!dic.ContainsKey(item.Name)) continue;
                    var value = dic[item.Name];
                    list.Add(Builders<T>.Update.Set(item.Name, value));
                }
                var updatefilter = Builders<T>.Update.Combine(list);
                return client.UpdateMany(filter, updatefilter);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region +UpdateManayAsync 异步批量修改数据
        /// <summary>
        /// 异步批量修改数据
        /// </summary>
        /// <param name="dic">要修改的字段</param>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">修改条件</param>
        /// <returns></returns>
        public  async Task<UpdateResult> UpdateManayAsync<T>(string collName, Dictionary<string, string> dic, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                T t = new T();
                //要修改的字段
                var list = new List<UpdateDefinition<T>>();
                foreach (var item in t.GetType().GetProperties())
                {
                    if (!dic.ContainsKey(item.Name)) continue;
                    var value = dic[item.Name];
                    list.Add(Builders<T>.Update.Set(item.Name, value));
                }
                var updatefilter = Builders<T>.Update.Combine(list);
                return await client.UpdateManyAsync(filter, updatefilter);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region Delete 删除一条数据
        /// <summary>
        /// 删除一条数据
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="id">objectId</param>
        /// <returns></returns>
        public  DeleteResult Delete<T>(string collName, string id,bool isObjectId=true) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                FilterDefinition<T> filter;
                if (isObjectId)
                {
                    filter = Builders<T>.Filter.Eq("_id", new ObjectId(id));
                }
                else
                {
                    filter = Builders<T>.Filter.Eq("_id", id);
                }
                return client.DeleteOne(filter);
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }
        #endregion

        #region DeleteAsync 异步删除一条数据
        /// <summary>
        /// 异步删除一条数据
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="id">objectId</param>
        /// <returns></returns>
        public  async Task<DeleteResult> DeleteAsync<T>(string collName, string id,bool isObjectId=true) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                //修改条件
                FilterDefinition<T> filter;
                if (isObjectId)
                {
                    filter = Builders<T>.Filter.Eq("_id", new ObjectId(id));
                }
                else
                {
                    filter = Builders<T>.Filter.Eq("_id", id);
                }
                return await client.DeleteOneAsync(filter);
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }
        #endregion

        #region DeleteMany 删除多条数据
        /// <summary>
        /// 删除一条数据
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">删除的条件</param>
        /// <returns></returns>
        public  DeleteResult DeleteMany<T>(string collName, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                return client.DeleteMany(filter);
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }
        #endregion

        #region DeleteManyAsync 异步删除多条数据
        /// <summary>
        /// 异步删除多条数据
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">删除的条件</param>
        /// <returns></returns>
        public  async Task<DeleteResult> DeleteManyAsync<T>(string collName, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                return await client.DeleteManyAsync(filter);
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }
        #endregion

        #region Count 根据条件获取总数
        /// <summary>
        /// 根据条件获取总数
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">条件</param>
        /// <returns></returns>
        public  long Count<T>(string collName, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                return client.Count(filter);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region CountAsync 异步根据条件获取总数
        /// <summary>
        /// 异步根据条件获取总数
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">条件</param>
        /// <returns></returns>
        public  async Task<long> CountAsync<T>(string collName, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                return await client.CountAsync(filter);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region FindOne 根据id查询一条数据
        /// <summary>
        /// 根据id查询一条数据
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="id">objectid</param>
        /// <param name="field">要查询的字段，不写时查询全部</param>
        /// <returns></returns>
        public  T FindOne<T>(string collName, string id,bool isObjectId=true, string[] field = null) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                FilterDefinition<T> filter;
                if (isObjectId)
                {
                    filter = Builders<T>.Filter.Eq("_id", new ObjectId(id));
                }
                else
                {
                    filter = Builders<T>.Filter.Eq("_id", id);
                }
                //不指定查询字段
                if (field == null || field.Length == 0)
                {
                    return client.Find(filter).FirstOrDefault<T>();
                }

                //制定查询字段
                var fieldList = new List<ProjectionDefinition<T>>();
                for (int i = 0; i < field.Length; i++)
                {
                    fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
                }
                var projection = Builders<T>.Projection.Combine(fieldList);
                fieldList?.Clear();
                return client.Find(filter).Project<T>(projection).FirstOrDefault<T>();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region FindOneAsync 异步根据id查询一条数据
        /// <summary>
        /// 异步根据id查询一条数据
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="id">objectid</param>
        /// <returns></returns>
        public  async Task<T> FindOneAsync<T>(string collName, string id,bool isObjectId=true, string[] field = null) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                FilterDefinition<T> filter;
                if (isObjectId)
                {
                    filter = Builders<T>.Filter.Eq("_id", new ObjectId(id));
                }
                else
                {
                    filter = Builders<T>.Filter.Eq("_id", id);
                }

                //不指定查询字段
                if (field == null || field.Length == 0)
                {
                    return await client.Find(filter).FirstOrDefaultAsync();
                }

                //制定查询字段
                var fieldList = new List<ProjectionDefinition<T>>();
                for (int i = 0; i < field.Length; i++)
                {
                    fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
                }
                var projection = Builders<T>.Projection.Combine(fieldList);
                fieldList?.Clear();
                return await client.Find(filter).Project<T>(projection).FirstOrDefaultAsync();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region FindList 查询集合
        /// <summary>
        /// 查询集合
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">查询条件</param>
        /// <param name="field">要查询的字段,不写时查询全部</param>
        /// <param name="sort">要排序的字段</param>
        /// <returns></returns>
        public  List<T> FindList<T>(string collName, FilterDefinition<T> filter, string[] field = null, SortDefinition<T> sort = null) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                //不指定查询字段
                if (field == null || field.Length == 0)
                {
                    if (sort == null) return client.Find(filter).ToList();
                    //进行排序
                    return client.Find(filter).Sort(sort).ToList();
                }

                //制定查询字段
                var fieldList = new List<ProjectionDefinition<T>>();
                for (int i = 0; i < field.Length; i++)
                {
                    fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
                }
                var projection = Builders<T>.Projection.Combine(fieldList);
                fieldList?.Clear();
                if (sort == null) return client.Find(filter).Project<T>(projection).ToList();
                //排序查询
                return client.Find(filter).Sort(sort).Project<T>(projection).ToList();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region FindListAsync 异步查询集合
        /// <summary>
        /// 异步查询集合
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">查询条件</param>
        /// <param name="field">要查询的字段,不写时查询全部</param>
        /// <param name="sort">要排序的字段</param>
        /// <returns></returns>
        public  async Task<List<T>> FindListAsync<T>(string collName, FilterDefinition<T> filter, string[] field = null, SortDefinition<T> sort = null) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                //不指定查询字段
                if (field == null || field.Length == 0)
                {
                    if (sort == null) return await client.Find(filter).ToListAsync();
                    return await client.Find(filter).Sort(sort).ToListAsync();
                }

                //制定查询字段
                var fieldList = new List<ProjectionDefinition<T>>();
                for (int i = 0; i < field.Length; i++)
                {
                    fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
                }
                var projection = Builders<T>.Projection.Combine(fieldList);
                fieldList?.Clear();
                if (sort == null) return await client.Find(filter).Project<T>(projection).ToListAsync();
                //排序查询
                return await client.Find(filter).Sort(sort).Project<T>(projection).ToListAsync();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region FindListByPage 分页查询集合
        /// <summary>
        /// 分页查询集合
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">查询条件</param>
        /// <param name="pageIndex">当前页</param>
        /// <param name="pageSize">页容量</param>
        /// <param name="count">总条数</param>
        /// <param name="field">要查询的字段,不写时查询全部</param>
        /// <param name="sort">要排序的字段</param>
        /// <returns></returns>
        public  List<T> FindListByPage<T>(string collName, FilterDefinition<T> filter, int pageIndex, int pageSize, out long count, string[] field = null, SortDefinition<T> sort = null) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                count = client.Count(filter);
                //不指定查询字段
                if (field == null || field.Length == 0)
                {
                    if (sort == null) return client.Find(filter).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
                    //进行排序
                    return client.Find(filter).Sort(sort).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();
                }

                //制定查询字段
                var fieldList = new List<ProjectionDefinition<T>>();
                for (int i = 0; i < field.Length; i++)
                {
                    fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
                }
                var projection = Builders<T>.Projection.Combine(fieldList);
                fieldList?.Clear();

                //不排序
                if (sort == null) return client.Find(filter).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();

                //排序查询
                return client.Find(filter).Sort(sort).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToList();

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region FindListByPageAsync 异步分页查询集合
        /// <summary>
        /// 异步分页查询集合
        /// </summary>
        /// <param name="host">mongodb连接信息</param>
        /// <param name="filter">查询条件</param>
        /// <param name="pageIndex">当前页</param>
        /// <param name="pageSize">页容量</param>
        /// <param name="field">要查询的字段,不写时查询全部</param>
        /// <param name="sort">要排序的字段</param>
        /// <returns></returns>
        public  async Task<List<T>> FindListByPageAsync<T>(string collName, FilterDefinition<T> filter, int pageIndex, int pageSize, string[] field = null, SortDefinition<T> sort = null) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                //不指定查询字段
                if (field == null || field.Length == 0)
                {
                    if (sort == null) return await client.Find(filter).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToListAsync();
                    //进行排序
                    return await client.Find(filter).Sort(sort).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToListAsync();
                }

                //制定查询字段
                var fieldList = new List<ProjectionDefinition<T>>();
                for (int i = 0; i < field.Length; i++)
                {
                    fieldList.Add(Builders<T>.Projection.Include(field[i].ToString()));
                }
                var projection = Builders<T>.Projection.Combine(fieldList);
                fieldList?.Clear();

                //不排序
                if (sort == null) return await client.Find(filter).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToListAsync();

                //排序查询
                return await client.Find(filter).Sort(sort).Project<T>(projection).Skip((pageIndex - 1) * pageSize).Limit(pageSize).ToListAsync();

            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        public async Task<bool> AnyAsync<T>(string collName, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                long count =await client.CountAsync(filter);
                return count > 0;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public bool Any<T>(string collName, FilterDefinition<T> filter) where T : class, new()
        {
            try
            {
                var client = _database.GetCollection<T>(collName);
                long count =  client.Count(filter);
                return count > 0;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

    }
}

连接类

using MongoDB.Bson;
using MongoDB.Driver;

namespace Entity.MongoDBHelper
{
    public class MongoDataBaseContext
    {
        public IMongoClient _client = null;
        public IMongoDatabase _database = null;
        public MongoDataBaseContext(MongodbHost host)
        {
            _client = new MongoClient(host.Connection);
            _database = _client.GetDatabase(host.DataBase);
        }
    }
    public class MongodbHost
    {
        /// <summary>
        /// 连接字符串
        /// </summary>
        public string Connection { get; set; }
        /// <summary>
        /// 库
        /// </summary>
        public string DataBase { get; set; }
        /// <summary>
        /// 表
        /// </summary>
        public string Table { get; set; }

    }
}

调用：

 FilterDefinition<MGApprovalModel> filter = Builders<MGApprovalModel>.Filter.Empty;
 filter = filter & Builders<MGApprovalsModel>.Filter.Eq(a => a.User.UserId, userId.ToString().ToUpper());

            long countRecognized = await _mongoDB.CountAsync<MGApprovalModel>(MGTable.Approvals, filter);//获取条件下的总数量
//排序
 SortDefinition<MGApprovalModel> sort = Builders<MGApprovalModel>.Sort.Descending(a => a.CreateDate);
            if (parameters.Order.ToUpper() == "DESC")
            {
                sort = Builders<MGApprovalModel>.Sort.Descending(c=>c.CreateDate);
            }
            if (parameters.Order.ToUpper() == "ASC")
            {
                sort = Builders<MGApprovalModel>.Sort.Ascending(c => c.CreateDate);
            }
             //查询字段
            string[] fileds = null;
_mongoDB.FindListByPage<MGApprovalModel>(MGTable.Approvals, filter & Builders<MGApprovalModel>.Filter.Eq(b => b.ToUser.UserId, a.ItemId.ToString().ToUpper()), page, pageSize,out countAll, fileds, sort)；//表名，条件，分页，总数量，字段，排序