c# - 在 MonoDevelop 中使用带有官方 C# 驱动程序的 GridFS

Question

我在 PC-BSD 10.1 上使用 MonoDevelop，并使用 MongoDB 3.2。我从 Nuget 下载了 MongoDB.Driver (+Bson& Core)。我可以进行基本的读写操作，并试图通过遵循似乎是 StackOverflow 的最新示例来让 GridFS 工作:

MongoDB GridFs with C#, how to store files such as images?

首先，我的系统无法识别(看似)静态的 MongoServer 类，因此我切换到 MognoClient 来获取数据库。然后我得到以下内容:

“类型 MongoDB.Driver.IMongoDatabase' 不包含 GridFS' 的定义，并且找不到类型为 GridFS' 的扩展方法 MongoDB.Driver.IMongoDatabase' .”

using System;
using System.IO;
using MongoDB;
using MongoDB.Driver;
using MongoDB.Driver.Core;
using MongoDB.Bson;
//using MongoDB.Driver.GridFS; -> an attempt to use the legacy driver.


namespace OIS.Objektiv.SocketServer
{
    public class Gridfs
    {
        public Gridfs ()
        {

            var server = MongoServer.Create("mongodb://localhost:27017");
            var database = server.GetDatabase("test");

//          var client = new MongoClient("mongodb://localhost:27017");
//          var database = client.GetDatabase("test");

            var fileName = "D:\\Untitled.png";
            var newFileName = "D:\\new_Untitled.png";
            using (var fs = new FileStream(fileName, FileMode.Open))
            {
                var gridFsInfo = database.GridFS.Upload(fs, fileName);
                var fileId = gridFsInfo.Id;

                ObjectId oid= new ObjectId(fileId);
                var file = database.GridFS.FindOne(Query.EQ("_id", oid));

                using (var stream = file.OpenRead())
                {
                    var bytes = new byte[stream.Length];
                    stream.Read(bytes, 0, (int)stream.Length);
                    using(var newFs = new FileStream(newFileName, FileMode.Create))
                    {
                        newFs.Write(bytes, 0, bytes.Length);
                    } 
                }
            }
        }
    }
}

我犯了什么愚蠢的错误？ GridFS 是否有我缺少的依赖项？这应该工作! :(

丁斯代尔

Answer 1

对于驱动程序版本 2.2，您必须下载一个名为 MongoDB.Driver.GridFS 的单独 NuGet 包。

你可以这样使用它:

IMongoDatabase database;

var bucket = new GridFSBucket(database, new GridFSOptions
{
    BucketName = "videos",
    ChunkSizeBytes = 1048576, // 1MB
    WriteConcern = WriteConcern.Majority,
    ReadPreference = ReadPeference.Secondary
}); 

IGridFSBucket bucket;
bytes[] source;
var options = new GridFSUploadOptions
{
    ChunkSizeBytes = 64512, // 63KB
    Metadata = new BsonDocument
    {
        { "resolution", "1080P" },
        { "copyrighted", true }
    } 
};  

var id = bucket.UploadFromBytes("filename", source, options);

Here the full doc .