C# mongodb帮助类
Posted chenyucong
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这是在C#连接MongoDB的帮助类，所使用的驱动是在Vs2015的Nuget管理器中下载的mongodb驱动。
下载第一个，会自动下载下面的两个，不要删除。
在配置文件中配置连接字符串connStr和数据库名称dbName：
1 <appSettings>
2 <add key="webpages:Version" value="3.0.0.0"/>
3 <add key="webpages:Enabled" value="false"/>
4 <add key="ClientValidationEnabled" value="true"/>
5 <add key="UnobtrusivejavascriptEnabled" value="true"/>
6 <add key="dbName" value="demodb"/>
7 </appSettings>
8 <connectionStrings>
9 <add name="connStr" connectionString="mongodb://127.0.0.1:27017"/>
10 </connectionStrings>
MongoDbHelper类：
1 using Cong.Model;
2 using MongoDB.Bson;
3 using MongoDB.Driver;
4 using System;
5 using System.Collections.Generic;
6 using System.Configuration;
7 using System.Linq;
8
9 namespace Cong.Utility
10 {
11 public class Db
12 {
13 private static readonly string connStr = ConfigurationManager.ConnectionStrings["connStr"].ToString();
14
15 private static readonly string dbName = ConfigurationManager.AppSettings["dbName"].ToString();
16
17 private static IMongoDatabase db = null;
18
19 private static readonly object lockHelper = new object();
20
21 private Db() { }
22
23 public static IMongoDatabase GetDb()
24 {
25 if (db == null)
26 {
27 lock (lockHelper)
28 {
29 if (db == null)
30 {
31 var client = new MongoClient(connStr);
32 db = client.GetDatabase(dbName);
33 }
34 }
35 }
36 return db;
37 }
38 }
39
40 public class MongoDbHelper<T> where T : BaseEntity
41 {
42 private IMongoDatabase db = null;
43
44 private IMongoCollection<T> collection = null;
45
46 public MgHelper()
47 {
48 this.db = Db.GetDb();
49 collection = db.GetCollection<T>(typeof(T).Name);
50 }
51
52 public T Insert(T entity)
53 {
54 var flag = ObjectId.GenerateNewId();
55 entity.GetType().GetProperty("Id").SetValue(entity, flag);
56 entity.State = "y";
57 entity.CreateTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
58 entity.UpdateTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
59
60 collection.InsertOneAsync(entity);
61 return entity;
62 }
63
64 public void Modify(string id, string field, string value)
65 {
66 var filter = Builders<T>.Filter.Eq("Id", ObjectId.Parse(id));
67 var updated = Builders<T>.Update.Set(field, value);
68 UpdateResult result = collection.UpdateOneAsync(filter, updated).Result;
69 }
70
71 public void Update(T entity)
72 {
73 var old = collection.Find(e => e.Id.Equals(entity.Id)).ToList().FirstOrDefault();
74
75 foreach (var prop in entity.GetType().GetProperties())
76 {
77 var newValue = prop.GetValue(entity);
78 var oldValue = old.GetType().GetProperty(prop.Name).GetValue(old);
79 if (newValue != null)
80 {
81 if (!newValue.ToString().Equals(oldValue.ToString()))
82 {
83 old.GetType().GetProperty(prop.Name).SetValue(old, newValue.ToString());
84 }
85 }
86 }
87 old.State = "y";
88 old.UpdateTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
89
90 var filter = Builders<T>.Filter.Eq("Id", entity.Id);
91 ReplaceOneResult result = collection.ReplaceOneAsync(filter, old).Result;
92 }
93
94 public void Delete(T entity)
95 {
96 var filter = Builders<T>.Filter.Eq("Id", entity.Id);
97 collection.DeleteOneAsync(filter);
98 }
99
100 public T QueryOne(string id)
101 {
102 return collection.Find(a => a.Id == ObjectId.Parse(id)).ToList().FirstOrDefault();
103 }
104
105 public List<T> QueryAll()
106 {
107 return collection.Find(a => a.State.Equals("y")).ToList();
108 }
109 }
110 }
另外，我的实体类全部都继承自下面这个基类，里面有几个数据中常用的字段
BaseEntity：
1 using MongoDB.Bson;
2 using System;
3 using System.Collections.Generic;
4 using System.Linq;
5 using System.Text;
6 using System.Threading.Tasks;
7
8 namespace Cong.Model
9 {
10 public abstract class BaseEntity
11 {
12 public ObjectId Id { get; set; }
13
14 public string State { get; set; }
15
16 public string CreateTime { get; set; }
17
18 public string UpdateTime { get; set; }
19 }
20 }
最后，这个是我在MVC的一个控制器的代码，使用了增改查的功能，以供参考，另外这个我是用模板生成的代码。
1 using Cong.Model;
2 using Cong.Utility;
3 using MongoDB.Bson;
4 using System.Web.Mvc;
5 using WebApp.Models;
6
7 namespace WebApp.Controllers
8 {
9
10 public partial class AuthController : BaseController
11 {
12 MgHelper<Auth> mg = new MgHelper<Auth>();
13
14 public ActionResult Index()
15 {
16 return View();
17 }
18
19 [HttpGet]
20 public ActionResult Create()
21 {
22 return View();
23 }
24
25 [HttpPost]
26 public ActionResult Create(Auth auth)
27 {
28 mg.Insert(auth);
29 return Content("<script>alert(\'success!\');window.location=\'/Auth/Create\';</script>");
30 }
31
32 [HttpGet]
33 public ActionResult Modify()
34 {
35 AuthVM authvm = new AuthVM { Auths = mg.QueryAll() };
36 return View(authvm);
37 }
38
39 [HttpPost]
40 public ActionResult Modify(Auth auth, FormCollection form)
41 {
42 auth.Id = ObjectId.Parse(form["id"]);
43 mg.Update(auth);
44 return Content("<script>alert(\'success!\');window.location=\'/Auth/Modify\';</script>");
45 }
46
47 [HttpPost]
48 public string Delete(string id)
49 {
50 mg.Modify(id, "State", "n");
51 return "success!";
52 }
53 }
54
55 public partial class RoleController : BaseController
56 {
57 MgHelper<Role> mg = new MgHelper<Role>();
58
59 public ActionResult Index()
60 {
61 return View();
62 }
63
64 [HttpGet]
65 public ActionResult Create()
66 {
67 return View();
68 }
69
70 [HttpPost]
71 public ActionResult Create(Role role)
72 {
73 mg.Insert(role);
74 return Content("<script>alert(\'success!\');window.location=\'/Role/Create\';</script>");
75 }
76
77 [HttpGet]
78 public ActionResult Modify()
79 {
80 RoleVM rolevm = new RoleVM { Roles = mg.QueryAll() };
81 return View(rolevm);
82 }
83
84 [HttpPost]
85 public ActionResult Modify(Role role, FormCollection form)
86 {
87 role.Id = ObjectId.Parse(form["id"]);
88 mg.Update(role);
89 return Content("<script>alert(\'success!\');window.location=\'/Role/Modify\';</script>");
90 }
91
92 [HttpPost]
93 public string Delete(string id)
94 {
95 mg.Modify(id, "State", "n");
96 return "success!";
97 }
98 }
99
100 public partial class UserController : BaseController
101 {
102 MgHelper<User> mg = new MgHelper<User>();
103
104 public ActionResult Index()
105 {
106 return View();
107 }
108
109 [HttpGet]
110 public ActionResult Create()
111 {
112 return View();
113 }
114
115 [HttpPost]
116 public ActionResult Create(User user)
117 {
118 mg.Insert(user);
119 return Content("<script>alert(\'success!\');window.location=\'/User/Create\';</script>");
120 }
121
122 [HttpGet]
123 public ActionResult Modify()
124 {
125 UserVM uservm = new UserVM { Users = mg.QueryAll() };
126 return View(uservm);
127 }
128
129 [HttpPost]
130 public ActionResult Modify(User user, FormCollection form)
131 {
132 user.Id = ObjectId.Parse(form["id"]);
133 mg.Update(user);
134 return Content("<script>alert(\'success!\');window.location=\'/User/Modify\';</script>");
135 }
136
137 [HttpPost]
138 public string Delete(string id)
139 {
140 mg.Modify(id, "State", "n");
141 return "success!";
142 }
143 }
144 }
我的测试项目是用户管理系统，有三个类： User（用户），Role（角色），Auth（权限）。
源代码下载：http://download.csdn.net/detail/cycong108/9737751
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