MongoDB-Getting Started with the C# Driver

浏览数：20 / 时间：2015年06月12日

简介：本文仅提供快速入门级别的使用C# Driver操作MongoDB，高手跳过

Downloading the C# Driver
1. 猛击下载

添加相关的dll引用

    MongoDB.Bson.dll
    MongoDB.Driver.dll

添加名称空间引用

using MongoDB.Bson;
using MongoDB.Driver;

获取客户端对象

var connectionString = "mongodb://localhost";
var client = new MongoClient(connectionString);

获取服务端对象
```
var server = client.GetServer();
```

获取要操作的数据库

var database = server.GetDatabase("test"); // "test" is the name of the database

CRUD(使用自定义的类)

自定义实体

public class Entity
{
    public ObjectId Id { get; set; }

    public string Name { get; set; }
}

获取要操作的表

// "entities" is the name of the collection
var collection = database.GetCollection<Entity>("entities");

新增一条记录

var entity = new Entity { Name = "Tom" };
collection.Insert(entity);
var id = entity.Id; // Insert will set the Id if necessary (as it was in this example)

查询一条记录

var query = Query<Entity>.EQ(e => e.Id, id);
var entity = collection.FindOne(query);

保存一条记录（发送整个实体到数据库）
```
entity.Name = "Dick";
collection.Save(entity);
```
修改一条记录（仅发送修改的部分到数据库，这一点是和保存还是有区别的，根据场景来自行判断需要用哪一种来更新数据）
```
var query = Query<Entity>.EQ(e => e.Id, id);
var update = Update<Entity>.Set(e => e.Name, "Harry"); // update modifiers
collection.Update(query, update);
```

删除一条记录

var query = Query<Entity>.EQ(e => e.Id, id);
collection.Remove(query);

完整演示代码：

 1 using MongoDB.Bson;
 2 using MongoDB.Driver;
 3 using MongoDB.Driver.Builders;
 4 using System;
 5 using System.Collections.Generic;
 6 using System.Linq;
 7 using System.Linq.Expressions;
 8 using System.Text;
 9 using System.Threading.Tasks;
10 
11 namespace MongoDBTest
12 {
13     class Program
14     {
15         static void Main(string[] args)
16         {
17             var connectionString = "mongodb://localhost:27017";
18             var client = new MongoClient(connectionString);
19             var server = client.GetServer();
20             var database = server.GetDatabase("test");
21             var collection = database.GetCollection<Entity>("entities");
22             var entity = new Entity { Name = "Tom" };
23             var i = collection.Insert(entity);
24             var id = entity.Id;
25 
26             var query = Query<Entity>.EQ(e => e.Id, id);
27             entity = collection.FindOne(query);
28             entity.Name = "Dick";
29             var s = collection.Save(entity);
30 
31             var update = Update<Entity>.Set(e => e.Name, "Harry");
32             collection.Update(query, update);
33 
34 
35             collection.Remove(query);
36 
37             Console.ReadKey();
38 
39         }
40 
41 
42     }
43     public class Entity
44     {
45         public ObjectId Id;
46         public string Name { get; set; }
47     }
48 
49 }