本文利用MongoDB官方发布的C#驱动，封闭了对MongoDB数据库的增删改查访问方法。
1、引用MongoDB for C# Driver
从网上下载C#访问MongoDB的驱动，得到两个DLL：
- MongoDB.Driver.dll
- MongoDB.Bson.dll
将它们引用到项目中。
2、编写数据库访问帮助类
编写MongoDB访问帮助类MongoDbHelper：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using MongoDB.Bson; 5 using MongoDB.Driver; 6 using MongoDB.Driver.Builders; 7 using MongoDbTest.Models; 8 9 namespace MongoDbTest 10 { 11 /// <summary> 12 /// MongoDB帮助类 13 /// </summary> 14 internal static class MongoDbHepler 15 { 16 /// <summary> 17 /// 获取数据库实例对象 18 /// </summary> 19 /// <param name="connectionString">数据库连接串</param> 20 /// <param name="dbName">数据库名称</param> 21 /// <returns>数据库实例对象</returns> 22 private static MongoDatabase GetDatabase(string connectionString, string dbName) 23 { 24 var server = MongoServer.Create(connectionString); 25 return server.GetDatabase(dbName); 26 } 27 28 #region 新增 29 30 /// <summary> 31 /// 插入一条记录 32 /// </summary> 33 /// <typeparam name="T">数据类型</typeparam> 34 /// <param name="connectionString">数据库连接串</param> 35 /// <param name="dbName">数据名称</param> 36 /// <param name="collectionName">集合名称</param> 37 /// <param name="model">数据对象</param> 38 public static void Insert<T>(string connectionString, string dbName, string collectionName, T model) where T : EntityBase 39 { 40 if (model == null) 41 { 42 throw new ArgumentNullException("model", "待插入数据不能为空"); 43 } 44 var db = GetDatabase(connectionString, dbName); 45 var collection = db.GetCollection<T>(collectionName); 46 collection.Insert(model); 47 } 48 49 #endregion 50 51 #region 更新 52 53 /// <summary> 54 /// 更新数据 55 /// </summary> 56 /// <param name="connectionString">数据库连接串</param> 57 /// <param name="dbName">数据库名称</param> 58 /// <param name="collectionName">集合名称</param> 59 /// <param name="query">查询条件</param> 60 /// <param name="dictUpdate">更新字段</param> 61 public static void Update(string connectionString, string dbName, string collectionName, IMongoQuery query, Dictionary<string, BsonValue> dictUpdate) 62 { 63 var db = GetDatabase(connectionString, dbName); 64 var collection = db.GetCollection(collectionName); 65 var update = new UpdateBuilder(); 66 if (dictUpdate != null && dictUpdate.Count > 0) 67 { 68 foreach (var item in dictUpdate) 69 { 70 update.Set(item.Key, item.Value); 71 } 72 } 73 var d = collection.Update(query, update, UpdateFlags.Multi); 74 } 75 76 #endregion 77 78 #region 查询 79 80 /// <summary> 81 /// 根据ID获取数据对象 82 /// </summary> 83 /// <typeparam name="T">数据类型</typeparam> 84 /// <param name="connectionString">数据库连接串</param> 85 /// <param name="dbName">数据库名称</param> 86 /// <param name="collectionName">集合名称</param> 87 /// <param name="id">ID</param> 88 /// <returns>数据对象</returns> 89 public static T GetById<T>(string connectionString, string dbName, string collectionName, ObjectId id) 90 where T : EntityBase 91 { 92 var db = GetDatabase(connectionString, dbName); 93 var collection = db.GetCollection<T>(collectionName); 94 return collection.FindOneById(id); 95 } 96 97 /// <summary> 98 /// 根据查询条件获取一条数据 99 /// </summary> 100 /// <typeparam name="T">数据类型</typeparam> 101 /// <param name="connectionString">数据库连接串</param> 102 /// <param name="dbName">数据库名称</param> 103 /// <param name="collectionName">集合名称</param> 104 /// <param name="query">查询条件</param> 105 /// <returns>数据对象</returns> 106 public static T GetOneByCondition<T>(string connectionString, string dbName, string collectionName, IMongoQuery query) 107 where T : EntityBase 108 { 109 var db = GetDatabase(connectionString, dbName); 110 var collection = db.GetCollection<T>(collectionName); 111 return collection.FindOne(query); 112 } 113 114 /// <summary> 115 /// 根据查询条件获取多条数据 116 /// </summary> 117 /// <typeparam name="T">数据类型</typeparam> 118 /// <param name="connectionString">数据库连接串</param> 119 /// <param name="dbName">数据库名称</param> 120 /// <param name="collectionName">集合名称</param> 121 /// <param name="query">查询条件</param> 122 /// <returns>数据对象集合</returns> 123 public static List<T> GetManyByCondition<T>(string connectionString, string dbName, string collectionName, IMongoQuery query) 124 where T : EntityBase 125 { 126 var db = GetDatabase(connectionString, dbName); 127 var collection = db.GetCollection<T>(collectionName); 128 return collection.Find(query).ToList(); 129 } 130 131 /// <summary> 132 /// 根据集合中的所有数据 133 /// </summary> 134 /// <typeparam name="T">数据类型</typeparam> 135 /// <param name="connectionString">数据库连接串</param> 136 /// <param name="dbName">数据库名称</param> 137 /// <param name="collectionName">集合名称</param> 138 /// <returns>数据对象集合</returns> 139 public static List<T> GetAll<T>(string connectionString, string dbName, string collectionName) 140 where T : EntityBase 141 { 142 var db = GetDatabase(connectionString, dbName); 143 var collection = db.GetCollection<T>(collectionName); 144 return collection.FindAll().ToList(); 145 } 146 147 #endregion 148 149 #region 删除 150 151 /// <summary> 152 /// 删除集合中符合条件的数据 153 /// </summary> 154 /// <param name="connectionString">数据库连接串</param> 155 /// <param name="dbName">数据库名称</param> 156 /// <param name="collectionName">集合名称</param> 157 /// <param name="query">查询条件</param> 158 public static void DeleteByCondition(string connectionString, string dbName, string collectionName, IMongoQuery query) 159 { 160 var db = GetDatabase(connectionString, dbName); 161 var collection = db.GetCollection(collectionName); 162 collection.Remove(query); 163 } 164 165 /// <summary> 166 /// 删除集合中的所有数据 167 /// </summary> 168 /// <param name="connectionString">数据库连接串</param> 169 /// <param name="dbName">数据库名称</param> 170 /// <param name="collectionName">集合名称</param> 171 public static void DeleteAll(string connectionString, string dbName, string collectionName) 172 { 173 var db = GetDatabase(connectionString, dbName); 174 var collection = db.GetCollection(collectionName); 175 collection.RemoveAll(); 176 } 177 178 #endregion 179 180 } 181 }