C#如何向MongoDB GridFs中存储文件

来自：http://outofmemory.cn/code-snippet/1745/C-how-MongoDB-GridFs-storage-file 

如下示例代码,使用的是MongoDB官方的csharp 驱动程序：

 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);
       } 
    }
 }

执行结果如下：

File：

Chunks collection: