.net core连接mongoDB

 配置文件

{
"ConnectionStrings": {
"ConnectionString": "mongodb://admin:123456@192.168.1.6:27017",
"DatabaseName": "testdb"
}
}

 首先引用包

<PackageReference Include="Microsoft.Extensions.Configuration" Version="3.1.2" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.2" />
<PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.2" />
<PackageReference Include="MongoDB.Driver" Version="2.10.2" />

CRUD 操作服务

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Extensions.Configuration;
using MongoDB.Driver;

namespace MongoDbTestConsoleApp
{
    /// <summary>
    /// 官方 https://api.mongodb.com/csharp/2.2/html/R_Project_CSharpDriverDocs.htm
    ///  https://docs.microsoft.com/zh-cn/aspnet/core/tutorials/first-mongo-app?view=aspnetcore-3.1&tabs=visual-studio
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class BaseRepository<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 BaseRepository(DatabaseSettings config, string tableName)
        {
            var client = new MongoClient(config.ConnectionString);    //获取链接字符串

            var database = client.GetDatabase(config.DatabaseName);

            //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);
        }
    }
}

　　配置文件模型

using System;
using System.Collections.Generic;
using System.Text;

namespace MongoDbTestConsoleApp
{
    public class DatabaseSettings
    {
        public string ConnectionString { get; set; }
        public string DatabaseName { get; set; }
    }
}

　　基础实体模型

using System;
using System.Collections.Generic;
using System.Text;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;

namespace MongoDbTestConsoleApp
{
    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(AddTime))]   //指明数据库中字段名为CreateDateTime
        public DateTime AddTime { get; set; }

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

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

　　测试模型

using System;
using System.Collections.Generic;
using System.Text;

namespace MongoDbTestConsoleApp
{
    public class StudentModel:BaseModel
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
}

　　另外关于mongodb想直接使用BsonDocument序列化

直接tojson是数据类型是有包装的 例如ObjectId 是ObjectId("5e5e71be0036020790ea4058")

如果想将mongodb的ObjectId转换成正常的json格式

{
        "_id" : ObjectId("5e5e71be0036020790ea4058"),
        "Name" : "test"
}

　　

{"_id":"5e58c528fbaf8aa66a11cfd9","name":"菜鸟教程"}

　　或则

{ "_id" : { "$oid" : "5e58c528fbaf8aa66a11cfd9" }, "name" : "菜鸟教程" }

　　具体代码如下 可以看到区别

            var testconl = mycol.Find(x => true).ToList();

            JsonWriterSettings jsonWriterSettings = new JsonWriterSettings();
            jsonWriterSettings.OutputMode = JsonOutputMode.Strict;

            foreach (var item in testconl)
            {
                var bsonType = item.BsonType;
                var dic = new Dictionary<string, object> { };
                foreach (var ele in item.Elements)
                {
                    
                    if (ele.Value is BsonObjectId)
                    {
                        var vid =new BsonString(ele.Value.ToString());
                        //item.Remove(ele.Name);
                        //item.Add(new BsonElement(ele.Name, vid));
                        dic.Add(ele.Name, ele.Value.ToString());
                    }
                    else
                    {
                        dic.Add(ele.Name, ele.Value);
                    }

                }
                Console.WriteLine(item.ToJson());
                Console.WriteLine(item.ToJson(jsonWriterSettings));
                Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(dic));
            }