ASP.NETCore使用MongoDB数据库

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环境：Asp.Net Core Mvc 2.2，MongoDB 4.09

参考文档：http://mongodb.github.io/mongo-csharp-driver/　　　　http://mongodb.github.io/mongo-csharp-driver/2.8/　　　　

https://docs.microsoft.com/zh-cn/aspnet/core/tutorials/first-mongo-app?view=aspnetcore-2.2&tabs=visual-studio

创建 ASP.NET Core Mvc 项目

添加models，添加services

基本的结构就这样了

在models和services项目中安装NuGet依赖库：MongoDB.Driver　　　　。我安装的最新版：2.8.1版本

Install-Package MongoDB.Driver -Version {VERSION}

添加实体模型类，添加对应的service操作类

BaseModel：

using System;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;

namespace MongoDBDemo.Models
{
    public class BaseModel
    {
        [BsonId]        //标记主键
        [BsonRepresentation(BsonType.ObjectId)]     //参数类型  ， 无需赋值
        public string Id { get; set; }

        [BsonElement(nameof(CreateDateTime))]   //指明数据库中字段名为CreateDateTime
        public DateTime CreateDateTime { get; set; }

        //[BsonElement(nameof(IsDelete))]
        public bool IsDelete { get; set; }

        public BaseModel()
        {
            CreateDateTime = DateTime.Now;
            IsDelete = false;
        }
    }
}

Student：

namespace MongoDBDemo.Models
{
    public class Student : BaseModel
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
}

BaseService：

using Microsoft.Extensions.Configuration;
using MongoDB.Driver;
using MongoDBDemo.Models;
using System.Collections.Generic;

namespace MongoDBDemo.Services
{
    public class BaseService<T> where T : BaseModel
    {
        private readonly IMongoCollection<T> _collection;   //数据表操作对象

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="config"></param>
        /// <param name="tableName">表名</param>
        public BaseService(IConfiguration config, string tableName)
        {
            var client = new MongoClient(config.GetConnectionString("MongoDBDemo"));    //获取链接字符串

            var database = client.GetDatabase(config.GetSection("MongoDBSetting:DBName").Value);   //数据库名 （不存在自动创建）

            //获取对特定数据表集合中的数据的访问
            _collection = database.GetCollection<T>(tableName);     // （不存在自动创建）
        }
        
        //Find<T> – 返回集合中与提供的搜索条件匹配的所有文档。
        //InsertOne – 插入提供的对象作为集合中的新文档。
        //ReplaceOne – 将与提供的搜索条件匹配的单个文档替换为提供的对象。
        //DeleteOne – 删除与提供的搜索条件匹配的单个文档。

        /// <summary>
        /// 获取所有
        /// </summary>
        /// <returns></returns>
        public List<T> Get()
        {
            return _collection.Find(T => true).ToList();
        }

        /// <summary>
        /// 获取单个
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public T Get(string id)
        {
            return _collection.Find<T>(T => T.Id == id).FirstOrDefault();
        }

        /// <summary>
        /// 创建
        /// </summary>
        /// <param name="T"></param>
        /// <returns></returns>
        public T Create(T T)
        {
            _collection.InsertOne(T);
            return T;
        }

        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="id"></param>
        /// <param name="TIn"></param>
        public void Update(string id, T TIn)
        {
            _collection.ReplaceOne(T => T.Id == id, TIn);
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="TIn"></param>
        public void Remove(T TIn)
        {
            _collection.DeleteOne(T => T.Id == TIn.Id);
        }

        /// <summary>
        /// 根据id删除
        /// </summary>
        /// <param name="id"></param>
        public void Remove(string id)
        {
            _collection.DeleteOne(T => T.Id == id);
        }
    }
}

StudentService：

using Microsoft.Extensions.Configuration;
using MongoDBDemo.Models;

namespace MongoDBDemo.Services
{
    public class StudentService : BaseService<Student>
    {
        public StudentService(IConfiguration config) : base(config, nameof(Student))
        {

        }
    }
}

配置文件 appsettings.json 加入

"ConnectionStrings": {
    "MongoDBDemo": "mongodb://localhost:27017" //连接字符串
  },
  "MongoDBSetting": {
    "DBName": "Test"
  },

上层写好后，需在Web层Startup类中配置注入service注入以便在控制中使用service操作mongodb

 services.AddScoped<StudentService>();       //注入service服务

注入service后在控制器试一下好不好使，运行项目后是好使的

HomeController控制器代码：

    public class HomeController : Controller
    {
        private readonly StudentService _studentService;
        public HomeController(StudentService studentService)                //构造函数注入
        {
            _studentService = studentService;
        }

        public IActionResult Index()
        {
            return View();
        }

        #region CRUD

        /// <summary>
        /// 获取所有
        /// </summary>
        /// <returns></returns>
        public ActionResult<List<Student>> Get()
        {
            return _studentService.Get();
        }

        /// <summary>
        /// 根据id获取
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        [HttpGet("{id}")]
        public ActionResult<Student> Get(string id)
        {
            var Student = _studentService.Get(id);
            if (Student == null)
            {
                return NotFound();
            }
            return Student;
        }

        /// <summary>
        ///添加
        /// </summary>
        /// <param name="Student"></param>
        /// <returns></returns>
        public ActionResult<Student> Create(Student Student)
        {
            _studentService.Create(Student);
            return Ok();
        }

        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="id"></param>
        /// <param name="StudentIn"></param>
        /// <returns></returns>
        public IActionResult Update(string id, Student StudentIn)
        {
            var Student = _studentService.Get(id);

            if (Student == null)
            {
                return NotFound();
            }
            _studentService.Update(id, StudentIn);
            return NoContent();
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public IActionResult Delete(string id)
        {
            var Student = _studentService.Get(id);

            if (Student == null)
            {
                return NotFound();
            }
            _studentService.Remove(Student.Id);
            return NoContent();
        }
        #endregion


        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }