MongoDB-Getting Started with the C# Driver

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

1. Downloading the C# Driver
   1. 猛击下载
2. 添加相关的dll引用

       MongoDB.Bson.dll
       MongoDB.Driver.dll
   

3. 添加名称空间引用

   using MongoDB.Bson;
   using MongoDB.Driver;

4. 获取客户端对象

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

5. 获取服务端对象

   var server = client.GetServer();

6. 获取要操作的数据库

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

7. CRUD(使用自定义的类)
   1. 自定义实体

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

   2. 获取要操作的表

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

   3. 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)

   4. 查询一条记录

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

   5. 保存一条记录（发送整个实体到数据库）

      entity.Name = "Dick";
      collection.Save(entity);

   6. 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);

   7. 删除一条记录

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

完整演示代码：

 using MongoDB.Bson;
 using MongoDB.Driver;
 using MongoDB.Driver.Builders;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Text;
 using System.Threading.Tasks;

 namespace MongoDBTest
 {
     class Program
     {
         static void Main(string[] args)
         {
             var connectionString = "mongodb://localhost:27017";
             var client = new MongoClient(connectionString);
             var server = client.GetServer();
             var database = server.GetDatabase("test");
             var collection = database.GetCollection<Entity>("entities");
             var entity = new Entity { Name = "Tom" };
             var i = collection.Insert(entity);
             var id = entity.Id;

             var query = Query<Entity>.EQ(e => e.Id, id);
             entity = collection.FindOne(query);
             entity.Name = "Dick";
             var s = collection.Save(entity);

             var update = Update<Entity>.Set(e => e.Name, "Harry");
             collection.Update(query, update);

             collection.Remove(query);

             Console.ReadKey();

         }

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

 }