.net 操作MongoDB 基础

1. 下载驱动，最好使用 NuGet 下载，直接搜索MongoDB；

2. 引用相关驱动

3. 部分测试代码，主要是针对MongoDB的GridFS 文件存储来用

 using Mongo.Model;
 using MongoDB.Bson;
 using MongoDB.Driver;
 using MongoDB.Driver.GridFS;
 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using System.Web;

 namespace Mongo.Helper
 {
     public static class MongoDBHelper
     {

         public static MongoClient client = new MongoClient("mongodb://localhost:27017");
         public static IMongoDatabase db = client.GetDatabase("dzdaTest");//获取需要操作数据库
         public static void Add(Model.UserInfo user)
         {
             var collects = db.GetCollection<Model.UserInfo>("user");//获取需要操作的集合
             collects.InsertOne(user);
         }

         public static List<UserInfo> FindAll()
         {
             List<UserInfo> lis = new List<UserInfo>();
             var collects = db.GetCollection<UserInfo>("user");
             var filter = new BsonDocument();
             using(var cursor = collects.Find(filter).ToCursor())//查询结果转化为类似游标的类型
             {
                 while (cursor.MoveNext())
                 {
                     foreach (UserInfo item in cursor.Current)
                     {
                         lis.Add(item);
                     }
                 }
             }
             return lis;
         }

         /// <summary>
         /// 上传图片
         /// </summary>
         /// <param name="name"></param>
         /// <param name="source"></param>
         /// <returns></returns>
         public static ObjectId UploadImg(string name, byte[] source)
         {
             var bucket = new GridFSBucket(db);//初始化GridFS
             return bucket.UploadFromBytes(name, source);
         }
         /// <summary>
         /// 上传图片
         /// </summary>
         /// <param name="name"></param>
         /// <param name="source"></param>
         /// <returns></returns>
         public static ObjectId UploadImg(string name, Stream source)
         {
             var bucket = new GridFSBucket(db);
             return bucket.UploadFromStream(name, source);
         }

         public async static Task<ObjectId> UploadImgAsync(string name, Stream source)
         {
             var bucket = new GridFSBucket(db);
             return await bucket.UploadFromStreamAsync(name, source);
         }
         /// <summary>
         /// 查询图片
         /// </summary>
         /// <param name="id"></param>
         /// <returns></returns>
         public static Stream FindImg(string id)
         {
             var bucket = new GridFSBucket(db);
             ObjectId objId=  new ObjectId(id);//通过ObjectId查询图片
             return bucket.OpenDownloadStream(objId);
         }

         /// <summary>
         /// 查询图片
         /// </summary>
         /// <param name="id"></param>
         /// <returns></returns>
         public static byte[] FindImgWithByte(string id)
         {
             var bucket = new GridFSBucket(db);
             ObjectId objId = new ObjectId(id);
             return bucket.DownloadAsBytes(objId);
         }
     }
 }