我正在开发一个以mongodb为后端的web应用程序。我想让用户上传图片到他们的个人资料,就像一个链接的个人资料图片。我在MVC2中使用aspx页面,我了解到GridFs库用于将大文件类型存储为二进制文件。我到处寻找如何做到这一点的线索,但mongodb没有任何关于GridFs或C# C#的文档。我既困惑又困惑,真的需要另一套大脑。
有人知道如何实际实现一个文件上传控制器,将用户上传的图像存储到mongodb集合中吗?万分感谢!
我已经尝试了各种不同的方法,但都没有效果。
Database db = mongo.getDB("Blog");
GridFile file = new GridFile(db);
file.Create("image.jpg");
var images = db.GetCollection("images");
images.Insert(file.ToDocument());
发布于 2015-09-20 03:38:07
由于2.1 RC-0驱动程序已经发布,上述答案很快就会过时。
在v2.1 MongoDB和GridFS中使用文件的方法现在可以通过以下方式完成:
using MongoDB.Bson;
using MongoDB.Driver;
using MongoDB.Driver.GridFS;
using System.IO;
using System.Threading.Tasks;
namespace MongoGridFSTest
{
class Program
{
static void Main(string[] args)
{
var client = new MongoClient("mongodb://localhost");
var database = client.GetDatabase("TestDB");
var fs = new GridFSBucket(database);
var id = UploadFile(fs);
DownloadFile(fs, id);
}
private static ObjectId UploadFile(GridFSBucket fs)
{
using (var s = File.OpenRead(@"c:\temp\test.txt"))
{
var t = Task.Run<ObjectId>(() => { return
fs.UploadFromStreamAsync("test.txt", s);
});
return t.Result;
}
}
private static void DownloadFile(GridFSBucket fs, ObjectId id)
{
//This works
var t = fs.DownloadAsBytesByNameAsync("test.txt");
Task.WaitAll(t);
var bytes = t.Result;
//This blows chunks (I think it's a driver bug, I'm using 2.1 RC-0)
var x = fs.DownloadAsBytesAsync(id);
Task.WaitAll(x);
}
}
}
这是从C#驱动程序测试here上的比较中获得的
发布于 2012-05-18 10:00:11
此示例将允许您将文档绑定到对象
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MongoDB.Driver;
using MongoDB.Driver.Linq;
using MongoDB.Bson;
using MongoDB.Driver.Builders;
using MongoDB.Driver.GridFS;
using System.IO;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
MongoServer ms = MongoServer.Create();
string _dbName = "docs";
MongoDatabase md = ms.GetDatabase(_dbName);
if (!md.CollectionExists(_dbName))
{
md.CreateCollection(_dbName);
}
MongoCollection<Doc> _documents = md.GetCollection<Doc>(_dbName);
_documents.RemoveAll();
//add file to GridFS
MongoGridFS gfs = new MongoGridFS(md);
MongoGridFSFileInfo gfsi = gfs.Upload(@"c:\mongodb.rtf");
_documents.Insert(new Doc()
{
DocId = gfsi.Id.AsObjectId,
DocName = @"c:\foo.rtf"
}
);
foreach (Doc item in _documents.FindAll())
{
ObjectId _documentid = new ObjectId(item.DocId.ToString());
MongoGridFSFileInfo _fileInfo = md.GridFS.FindOne(Query.EQ("_id", _documentid));
gfs.Download(item.DocName, _fileInfo);
Console.WriteLine("Downloaded {0}", item.DocName);
Console.WriteLine("DocName {0} dowloaded", item.DocName);
}
Console.ReadKey();
}
}
class Doc
{
public ObjectId Id { get; set; }
public string DocName { get; set; }
public ObjectId DocId { get; set; }
}
https://stackoverflow.com/questions/4988436
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