MongoDB的GridFS的用C＃，如何存储文件，如图像？ [英] MongoDB GridFs with C#, how to store files such as images?

问题描述

我发展与MongoDB中为我后端的Web应用程序。我想有用户上传图片到他们的个人资料如链接的用户照片。我使用的是与MVC2一个aspx页面，我读了GridFS的库用于存储大量的文件类型为二进制文件。我到处找线索，如何做到这一点，但MongoDB中没有任何文件的C＃API或GridFS的C＃。我感到困惑和迷茫，真的可以使用另一套脑筋。

任何一个知道如何真正实现存储被用户上传到一个MongoDB中收集的图像文件上传器？万分感谢！

我已经试过这种变化也没有用。

 数据库DB = mongo.getDB（博客）;
GridFile文件=新GridFile（DB）;
file.Create（image.jpg的）;

VAR图像= db.GetCollection（图像）;
images.Insert（file.ToDocument（））;
 

解决方案

下面的例子展示如何保存文件，并从GridFS的（使用MongoDB的官方驱动程序）回读：

  VAR服务器= MongoServer.Create（MongoDB的：//本地主机：27020）;
 VAR数据库= server.GetDatabase（tesdb）;

 VAR文件名=D：\\ Untitled.png;
 VAR newFileName =D：\\ new_Untitled.png;
 使用（VAR FS =新的FileStream（文件名，FileMode.Open））
 {
    VAR gridFsInfo = database.GridFS.Upload（FS，文件名）;
    VAR FILEID = gridFsInfo.Id;

    的ObjectId OID =新的ObjectId（FILEID）;
    var文件= database.GridFS.FindOne（Query.EQ（_ ID，OID））;

    使用（VAR流= file.OpenRead（））
    {
       VAR字节=新字节[stream.Length]
       stream.Read（字节，0，（int）的stream.Length）;
       使用（VAR使用newfs =新的FileStream（newFileName，FileMode.Create））
       {
         newFs.Write（字节，0，bytes.Length）;
       }
    }
 }
 

结果：

文件：

大块系列：

希望这有助于。

I'm developing a web app with mongodb as my back-end. I'd like to have users upload pictures to their profiles like a linked-in profile pic. I'm using an aspx page with MVC2 and I read that GridFs library is used to store large file types as binaries. I've looked everywhere for clues as how this is done, but mongodb doesn't have any documentation for C# api or GridFs C#. I'm baffled and confused, could really use another set of brains.

Anyone one know how to actually implement a file upload controller that stores an image uploaded by a user into a mongodb collection? Thanks a million!

I've tried variations of this to no avail.

Database db = mongo.getDB("Blog");
GridFile file = new GridFile(db);
file.Create("image.jpg");

var images = db.GetCollection("images");
images.Insert(file.ToDocument());

解决方案

Following example show how to save file and read back from gridfs(using official mongodb driver):

 var server = MongoServer.Create("mongodb://localhost:27020");
 var database = server.GetDatabase("tesdb");

 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);
       } 
    }
 }

Results:

File:

Chunks collection:

Hope this help.

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