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c#简单操作MongoDB_2.4

一、MongoDB的安装

　　MongoDb在windows下的安装与以auth方式启用服务

二、下载驱动

　　使用nuget搜索“mongodb”，下载“MongoDB.Driver”（这是官方推荐的一个驱动，完全免费），它会自动下载“MongoDB.Bson”、“MongoDB.Driver.Core”

　　Api文档地址

　三、代码编写

　　1、新建四个类：商品、商品销售状态枚举、商品评论、商品评论审核状态枚举

using System.ComponentModel;

namespace Models
{
    /// <summary>
    /// Copyright (C) 2017 yjq 版权所有。
    /// 类名：ProductSaleState.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：商品销售状态
    /// 创建标识：yjq 2017/5/21 0:36:02
    /// </summary>
    public enum ProductSaleState
    {
        /// <summary>
        /// 待审核
        /// </summary>
        [Description("待审核")]
        WaitingCheck = 1,

        /// <summary>
        /// 上架
        /// </summary>
        [Description("上架")]
        OnSale = 2,

        /// <summary>
        /// 下架
        /// </summary>
        [Description("下架")]
        OffShelves = 3,

        /// <summary>
        /// 已销售
        /// </summary>
        [Description("已销售")]
        Saled = 4
    }
}


using System.ComponentModel;

namespace Models
{
    /// <summary>
    /// Copyright (C) 2017 yjq 版权所有。
    /// 类名：CommentCheckState.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：评论审核状态
    /// 创建标识：yjq 2017/5/21 0:51:43
    /// </summary>
    public enum CommentCheckState
    {
        /// <summary>
        /// 待审核
        /// </summary>
        [Description("待审核")]
        WaitingCheck = 1,

        /// <summary>
        /// 审核通过
        /// </summary>
        [Description("审核通过")]
        Passed = 2,

        /// <summary>
        /// 审核不通过
        /// </summary>
        [Description("审核不通过")]
        NotPass = 3
    }
}


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

namespace Models
{
    /// <summary>
    /// Copyright (C) 2015 备胎 版权所有。
    /// 类名：Product.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：商品
    /// 创建标识：yjq 2017/5/18 14:59:35
    /// </summary>
    public sealed class Product
    {
        public Product()
        {
        }

        public Product(string name, decimal price) : this()
        {
            Id = ObjectId.GenerateNewId();
            Name = name;
            Price = price;
            SaleState = ProductSaleState.WaitingCheck;
            CreateTime = DateTime.Now;
        }

        /// <summary>
        /// 商品ID
        /// </summary>
        [BsonElement(elementName: "_id")]
        public ObjectId Id { get; set; }

        /// <summary>
        /// 商品名字
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 价格
        /// </summary>
        public decimal? Price { get; set; }

        /// <summary>
        /// 销售状态
        /// </summary>
        public ProductSaleState SaleState { get; set; }

        /// <summary>
        /// 添加时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime CreateTime { get; set; }

        /// <summary>
        /// 修改时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime? ModifyTime { get; set; }

        /// <summary>
        /// 商品评论
        /// </summary>
        public List<ProductComment> Comments { get; set; }

        public override string ToString()
        {
            return $"{Id}:{Name},价格{Price}元,审核状态{SaleState.Desc()}";
        }
    }
}


using Infrastructure;

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

namespace Models
{
    /// <summary>
    /// Copyright (C) 2015 备胎 版权所有。
    /// 类名：ProductComment.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：商品评论
    /// 创建标识：yjq 2017/5/18 15:08:32
    /// </summary>
    public sealed class ProductComment
    {
        /// <summary>
        /// 评论ID
        /// </summary>
        [BsonElement(elementName: "_id")]
        public ObjectId Id { get; set; }

        /// <summary>
        /// 评论内容
        /// </summary>
        public string Content { get; set; }

        /// <summary>
        /// 评论审核状态
        /// </summary>
        public CommentCheckState CheckState { get; set; }

        /// <summary>
        /// 添加时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime CreateTime { get; set; }

        /// <summary>
        /// 修改时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime? ModifyTime { get; set; }

        public override string ToString()
        {
            return $"评论信息:{Content},审核状态:{CheckState.Desc()}";
        }
    }
}

商品、商品评论

　　2、我们先进行新增一个苹果，价格为5.2，且审核状态为待审核的，然后在查询商品列表，输出所有的商品，并显示出其状态

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

namespace MongoDbTest
{
    class Program
    {
        private static string _MongoDbConnectionStr = "mongodb://yjq:123456@localhost:27017/admin";

        static void Main(string[] args)
        {
            var productCollection = GetCollection<Product>();
            //添加一个待审核的商品
            Product product = new Product("苹果", (decimal)5.20);
            productCollection.InsertOne(product);
            Console.WriteLine($"添加商品：{product.ToString()}成功。");
            var productList = productCollection.Find(new BsonDocument()).ToList();
            foreach (var item in productList)
            {
                Console.WriteLine(item.ToString());
            }

            Console.Read();


        }

        private static IMongoCollection<T> GetCollection<T>(string collectionName = null)
        {
            MongoUrl mongoUrl = new MongoUrl(_MongoDbConnectionStr);
            var mongoClient = new MongoClient(mongoUrl);
            var database = mongoClient.GetDatabase(mongoUrl.DatabaseName);
            return database.GetCollection<T>(collectionName ?? typeof(T).Name);
        }
    }
}

运行代码

　　用robomongodb打开，然后查看对应信息，我们会发现数据库里面存储的时间比我们的当前时间晚8小时，这是因为在安装mongodb的时候，默认的时区不是我们本地的时区导致的，但是只要在时间字段上标记[BsonDateTimeOptions(Kind = DateTimeKind.Local)]就可以在输出的时候显示我们本地时间了。

到这里，我们就完成了简单的新增和查询功能，接下来我们先随机插入几个审核通过、不通过、待审核的商品共100个。

代码如下：

更改product代码

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

namespace Models
{
    /// <summary>
    /// Copyright (C) 2015 备胎 版权所有。
    /// 类名：Product.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：商品
    /// 创建标识：yjq 2017/5/18 14:59:35
    /// </summary>
    public sealed class Product
    {
        public Product()
        {
        }

        public Product(string name, decimal price) : this(name, price, ProductSaleState.WaitingCheck)
        {
        }

        public Product(string name, decimal price, ProductSaleState saleState)
        {
            Id = ObjectId.GenerateNewId();
            Name = name;
            Price = price;
            SaleState = saleState;
            CreateTime = DateTime.Now;
        }

        /// <summary>
        /// 商品ID
        /// </summary>
        [BsonElement(elementName: "_id")]
        public ObjectId Id { get; set; }

        /// <summary>
        /// 商品名字
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 价格
        /// </summary>
        public decimal? Price { get; set; }

        /// <summary>
        /// 销售状态
        /// </summary>
        public ProductSaleState SaleState { get; set; }

        /// <summary>
        /// 添加时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime CreateTime { get; set; }

        /// <summary>
        /// 修改时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime? ModifyTime { get; set; }

        /// <summary>
        /// 商品评论
        /// </summary>
        public List<ProductComment> Comments { get; set; }

        public override string ToString()
        {
            return $"{Id}:{Name},价格{Price}元,审核状态{SaleState.Desc()}";
        }
    }
}

Product

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

namespace MongoDbTest
{
    class Program
    {
        private static string _MongoDbConnectionStr = "mongodb://yjq:123456@localhost:27017/admin";

        static void Main(string[] args)
        {
            var productCollection = GetCollection<Product>();
            //添加一个待审核的商品
            //Product product = new Product("苹果", (decimal)5.20);
            //productCollection.InsertOne(product);
            //Console.WriteLine($"添加商品：{product.ToString()}成功。");

            //批量增加商品
            List<Product> productAddList = new List<Product>();
            for (int i = 0; i < 100; i++)
            {
                productAddList.Add(GetRandomProduct());
            }
            productCollection.InsertMany(productAddList);
            var productList = productCollection.Find(new BsonDocument()).ToList();
            foreach (var item in productList)
            {
                Console.WriteLine(item.ToString());
            }

            Console.Read();


        }

        private static IMongoCollection<T> GetCollection<T>(string collectionName = null)
        {
            MongoUrl mongoUrl = new MongoUrl(_MongoDbConnectionStr);
            var mongoClient = new MongoClient(mongoUrl);
            var database = mongoClient.GetDatabase(mongoUrl.DatabaseName);
            return database.GetCollection<T>(collectionName ?? typeof(T).Name);
        }

        private static string[] _ProductNames = new string[] { "苹果", "香蕉", "菠萝", "哈密瓜", "西瓜", "黄瓜", "草莓", "桃子", "芒果", "猕猴桃", "梨" };
        private static Random rn = new Random();
        private static Product GetRandomProduct()
        {
            var i = rn.Next(_ProductNames.Length);
            decimal price = i * 15;
            var enumValue = rn.Next(1, 5);
            return new Product(_ProductNames[i], price, (ProductSaleState)enumValue);
        }
    }
}

Program

然后运行，可以去robo查看结果，发现数据库里面总共有101条数据

批量增加的操作也执行了，那么接下来我们就继续执行分页和修改删除的功能。

首先我们先查询返回总记录数和前20条商品信息的内容：

static void Main(string[] args)
        {
            var productCollection = GetCollection<Product>();
            //添加一个待审核的商品
            //Product product = new Product("苹果", (decimal)5.20);
            //productCollection.InsertOne(product);
            //Console.WriteLine($"添加商品：{product.ToString()}成功。");

            //批量增加商品
            //List<Product> productAddList = new List<Product>();
            //for (int i = 0; i < 100; i++)
            //{
            //    productAddList.Add(GetRandomProduct());
            //}
            //productCollection.InsertMany(productAddList);
            //var productList = productCollection.Find(new BsonDocument()).ToList();
            //foreach (var item in productList)
            //{
            //    Console.WriteLine(item.ToString());
            //}
            FilterDefinition<Product> filter = new BsonDocument();
            long productAllCount = productCollection.Count(filter);
            var productList = productCollection.Find(filter).Skip(0).Limit(20).ToList();
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine($"总记录数为{productAllCount.ToString()}");
            Console.ForegroundColor = ConsoleColor.Blue;
            Console.WriteLine("前20条商品信息为：");
            Console.ForegroundColor = ConsoleColor.White;
            foreach (var item in productList)
            {
                Console.WriteLine(item.ToString());
            }
            Console.Read();


        }

Program

因为商品是随机产生的，所以可能导致你我之间的结果不一样。

接下来我们查询待审核的商品，并显示待审核的商品总数，我们更改下filte（使用lambda表达式树比较方便），二选一都可以

Expression<Func<Product, bool>> expression = m => m.SaleState == ProductSaleState.WaitingCheck;
            long productAllCount = productCollection.Count(expression);
            var productList = productCollection.Find(expression).Skip(0).Limit(20).ToList();
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine($"总记录数为{productAllCount.ToString()}");
            Console.ForegroundColor = ConsoleColor.Blue;
            Console.WriteLine("前20条商品信息为：");
            Console.ForegroundColor = ConsoleColor.White;
            foreach (var item in productList)
            {
                Console.WriteLine(item.ToString());
            }

待审核商品

#region 待审核 filter构建
            var filter = Builders<Product>.Filter.Eq("SaleState", ProductSaleState.WaitingCheck);
            long productAllCount = productCollection.Count(filter);
            var productList = productCollection.Find(filter).Skip(0).Limit(20).ToList();
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine($"总记录数为{productAllCount.ToString()}");
            Console.ForegroundColor = ConsoleColor.Blue;
            Console.WriteLine("前20条商品信息为：");
            Console.ForegroundColor = ConsoleColor.White;
            foreach (var item in productList)
            {
                Console.WriteLine(item.ToString());
            }
            #endregion

filter 构建条件

接下来我们对第1条待审核的商品进行审核通过的操作，并增加一条“哇，这个好好吃啊！”的评论。

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

namespace Models
{
    /// <summary>
    /// Copyright (C) 2015 备胎 版权所有。
    /// 类名：Product.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：商品
    /// 创建标识：yjq 2017/5/18 14:59:35
    /// </summary>
    public sealed class Product
    {
        public Product()
        {
        }

        public Product(string name, decimal price) : this(name, price, ProductSaleState.WaitingCheck)
        {
        }

        public Product(string name, decimal price, ProductSaleState saleState)
        {
            Id = ObjectId.GenerateNewId();
            Name = name;
            Price = price;
            SaleState = saleState;
            CreateTime = DateTime.Now;
        }

        /// <summary>
        /// 商品ID
        /// </summary>
        [BsonElement(elementName: "_id")]
        public ObjectId Id { get; set; }

        /// <summary>
        /// 商品名字
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 价格
        /// </summary>
        public decimal? Price { get; set; }

        /// <summary>
        /// 销售状态
        /// </summary>
        public ProductSaleState SaleState { get; set; }

        /// <summary>
        /// 添加时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime CreateTime { get; set; }

        /// <summary>
        /// 修改时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime? ModifyTime { get; set; }

        /// <summary>
        /// 商品评论
        /// </summary>
        public List<ProductComment> Comments { get; set; }

        public override string ToString()
        {
            return $"{Id}:{Name},价格{Price}元,审核状态{SaleState.Desc()}";
        }

        public void ShowComments()
        {
            if (Comments != null)
            {
                foreach (var item in Comments)
                {
                    Console.WriteLine(item.ToString());
                }
            }
            
        }

        public void Comment(string content)
        {
            if (Comments == null)
            {
                Comments = new List<Models.ProductComment>();
            }
            Comments.Add(new Models.ProductComment(content));
        }
    }
}

Product类的更改

using Infrastructure;

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

namespace Models
{
    /// <summary>
    /// Copyright (C) 2015 备胎 版权所有。
    /// 类名：ProductComment.cs
    /// 类属性：公共类（非静态）
    /// 类功能描述：商品评论
    /// 创建标识：yjq 2017/5/18 15:08:32
    /// </summary>
    public sealed class ProductComment
    {
        public ProductComment(string content)
        {
            if (content == null)
            {
                throw new ArgumentNullException("content");
            }
            Id = ObjectId.GenerateNewId();
            Content = content;
            CheckState = CommentCheckState.WaitingCheck;
            CreateTime = DateTime.Now;
        }

        /// <summary>
        /// 评论ID
        /// </summary>
        [BsonElement(elementName: "_id")]
        public ObjectId Id { get; set; }

        /// <summary>
        /// 评论内容
        /// </summary>
        public string Content { get; set; }

        /// <summary>
        /// 评论审核状态
        /// </summary>
        public CommentCheckState CheckState { get; set; }

        /// <summary>
        /// 添加时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime CreateTime { get; set; }

        /// <summary>
        /// 修改时间
        /// </summary>
        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime? ModifyTime { get; set; }

        public override string ToString()
        {
            return $"评论信息:{Content},审核状态:{CheckState.Desc()}";
        }
    }
}

ProductComment类代码的更改

var beforeUpdateProduct = productCollection.Find(m => m.SaleState == ProductSaleState.WaitingCheck).FirstOrDefault();
            Console.WriteLine($"更新前信息{beforeUpdateProduct?.ToString()}");
            //注意线程安全，这里只是做演示
            beforeUpdateProduct.Comment("哇，这个好好吃啊！");
            var updateFilter = Builders<Product>.Update.Set(m => m.SaleState, ProductSaleState.OnSale).Set(m => m.ModifyTime, DateTime.Now).Set(m => m.Comments, beforeUpdateProduct.Comments);
            var updateResult = productCollection.UpdateOne(m => m.Id == beforeUpdateProduct.Id, updateFilter);
            if (updateResult.IsModifiedCountAvailable)
            {
                var afterUpdateProduct = productCollection.Find(m => m.Id == beforeUpdateProduct.Id).FirstOrDefault();
                Console.WriteLine("更新销售状态成功=====");
                Console.WriteLine($"更新后信息{afterUpdateProduct?.ToString()}");
                Console.WriteLine("评论信息：");
                afterUpdateProduct.ShowComments();
            }
            else
            {
                Console.WriteLine("更新失败=====");
            }

更新审核状态，并添加评论

下一步我们查找有评论待审核的商品列表

            var commentWaitingCheckProducts = productCollection.Find(m => m.Comments.Where(k => k.CheckState == CommentCheckState.WaitingCheck).Any()).ToEnumerable();
            foreach (var item in commentWaitingCheckProducts)
            {
                Console.WriteLine(item.ToString());
            }

查询评论有待审核的商品

            var projection = Builders<Product>.Projection.Expression(m => new ProductDto
            {
                Comments = m.Comments,
                Id = m.Id,
                Name = m.Name,
                Price = m.Price,
                SaleState = m.SaleState
            });

            var commentWaitingCheckProducts = productCollection.Find(m => m.Comments.Where(k => k.CheckState == CommentCheckState.WaitingCheck).Any()).Project(projection).ToEnumerable();
            foreach (var item in commentWaitingCheckProducts)
            {
                Console.WriteLine(item.ToString());
            }

利用Projection查询dto

简单的操作就到这里了，其它的一些操作可以根据文档来，驱动对lambda的支持可以让我们更加容易上手查询一些条件难的查询。

Api文档地址，该示例源码下载

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原文地址：https://www.cnblogs.com/yjq-code/p/6883777.html