TestingCodes

HiMongo.cs

using UnityEngine;
using System.Collections;
using MongoDB.Bson;
using MongoDB.Driver;
using MongoDB.Driver.Builders;
using MongoDB.Driver.GridFS;
using MongoDB.Driver.Linq;
using System.IO;

public class HiMongo : MonoBehaviour {

	// Use this for initialization
	void Start () {
        var client = new MongoClient("mongodb://localhost:27017");
        var server = client.GetServer();
        var database = server.GetDatabase("tesdb");

        var fileName = "F:\\Untitled2.png";
        var newFileName = "F:\\new_Untitled2.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.ToString());
            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);
                }
            }
        }
    }
}