internal class Program  {   private static void Main(string[] args)   {    GridFSHelper helper = new GridFSHelper("mongodb://localhost", "GridFSDemo", "Pictures");     #region 上傳圖片     //第一種    //Image image = Image.FromFile("D://dog.jpg");    //byte[] imgdata = ImageHelper.ImageToBytes(image);    //ObjectId oid = helper.UploadGridFSFromBytes(imgdata);     //第二種    //Image image = Image.FromFile("D://man.jpg");    //Stream imgSteam = ImageHelper.ImageToStream(image);    //ObjectId oid = helper.UploadGridFSFromStream("man",imgSteam);    //LogHelper.WriteFile(oid.ToString());    // Console.Write(oid.ToString());     #endregion     #region 下載圖片     //第一種    //ObjectId downId = new ObjectId("578e2d17d22aed1850c7855d");    //byte[] Downdata= helper.DownloadAsByteArray(downId);    //string name= ImageHelper.CreateImageFromBytes("coolcar",Downdata);     //第二種    // byte[] Downdata = helper.DownloadAsBytesByName("QQQ");    //string name = ImageHelper.CreateImageFromBytes("dog", Downdata);     //第三種    //byte[] Downdata = helper.DownloadAsBytesByName("QQQ");    //Image img = ImageHelper.BytesToImage(Downdata);    //string path = Path.GetFullPath(@"../../DownLoadImg/") + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".jpg";    ////使用path獲取當前應用程序集的執行目錄的上級的上級目錄    //img.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);     #endregion     #region 查找圖片    GridFSFileInfo gridFsFileInfo = helper.FindFiles("man");    Console.WriteLine(gridFsFileInfo.Id);    #endregion     #region 刪除圖片    //helper.DroppGridFSBucket();    #endregion     Console.ReadKey();   }  } 

using System; using System.Collections.Generic; using System.Configuration; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using MongoDB.Bson; using MongoDB.Driver; using MongoDB.Driver.GridFS;  namespace MongoDemo {  public class GridFSHelper  {   private readonly IMongoClient client;   private readonly IMongoDatabase database;   private readonly IMongoCollection<BsonDocument> collection;   private readonly GridFSBucket bucket;   private GridFSFileInfo fileInfo;   private ObjectId oid;    public GridFSHelper()    : this(     ConfigurationManager.AppSettings["mongoQueueUrl"], ConfigurationManager.AppSettings["mongoQueueDb"],     ConfigurationManager.AppSettings["mongoQueueCollection"])   {   }    public GridFSHelper(string url, string db, string collectionName)   {    if (url == null)    {     throw new ArgumentNullException("url");    }    else    {     client = new MongoClient(url);    }     if (db == null)    {     throw new ArgumentNullException("db");    }    else    {     database = client.GetDatabase(db);    }     if (collectionName == null)    {     throw new ArgumentNullException("collectionName");    }    else    {     collection = database.GetCollection<BsonDocument>(collectionName);    }     //this.collection = new MongoClient(url).GetDatabase(db).GetCollection<BsonDocument>(collectionName);     GridFSBucketOptions gfbOptions = new GridFSBucketOptions()    {     BucketName = "bird",     ChunkSizeBytes = 1*1024*1024,     ReadConcern = null,     ReadPreference = null,     WriteConcern = null    };    var bucket = new GridFSBucket(database, new GridFSBucketOptions    {     BucketName = "videos",     ChunkSizeBytes = 1048576, // 1MB     WriteConcern = WriteConcern.WMajority,     ReadPreference = ReadPreference.Secondary    });    this.bucket = new GridFSBucket(database, null);   }    public GridFSHelper(IMongoCollection<BsonDocument> collection)   {    if (collection == null)    {     throw new ArgumentNullException("collection");    }    this.collection = collection;    this.bucket = new GridFSBucket(collection.Database);   }     public ObjectId UploadGridFSFromBytes(string filename, Byte[] source)   {    oid = bucket.UploadFromBytes(filename, source);    return oid;   }    public ObjectId UploadGridFSFromStream(string filename,Stream source)   {    using (source)    {     oid = bucket.UploadFromStream(filename, source);     return oid;    }   }    public Byte[] DownloadAsByteArray(ObjectId id)   {    Byte[] bytes = bucket.DownloadAsBytes(id);    return bytes;   }    public Stream DownloadToStream(ObjectId id)   {    Stream destination = new MemoryStream();    bucket.DownloadToStream(id, destination);    return destination;   }    public Byte[] DownloadAsBytesByName(string filename)   {    Byte[] bytes = bucket.DownloadAsBytesByName(filename);    return bytes;   }    public Stream DownloadToStreamByName(string filename)   {    Stream destination = new MemoryStream();    bucket.DownloadToStreamByName(filename, destination);    return destination;   }    public GridFSFileInfo FindFiles(string filename)   {    var filter = Builders<GridFSFileInfo>.Filter.And(    Builders<GridFSFileInfo>.Filter.Eq(x => x.Filename, "man"),    Builders<GridFSFileInfo>.Filter.Gte(x => x.UploadDateTime, new DateTime(2015, 1, 1, 0, 0, 0, DateTimeKind.Utc)),    Builders<GridFSFileInfo>.Filter.Lt(x => x.UploadDateTime, new DateTime(2017, 2, 1, 0, 0, 0, DateTimeKind.Utc)));    var sort = Builders<GridFSFileInfo>.Sort.Descending(x => x.UploadDateTime);    var options = new GridFSFindOptions    {     Limit = 1,     Sort = sort    };    using (var cursor = bucket.Find(filter, options))    {      fileInfo = cursor.ToList().FirstOrDefault();    }    return fileInfo;   }     public void DeleteAndRename(ObjectId id)   {    bucket.Delete(id);   }    //The “fs.files” collection will be dropped first, followed by the “fs.chunks” collection. This is the fastest way to delete all files stored in a GridFS bucket at once.   public void DroppGridFSBucket()   {    bucket.Drop();   }    public void RenameAsingleFile(ObjectId id,string newFilename)   {    bucket.Rename(id, newFilename);   }    public void RenameAllRevisionsOfAfile(string oldFilename,string newFilename)   {    var filter = Builders<GridFSFileInfo>.Filter.Eq(x => x.Filename, oldFilename);    var filesCursor = bucket.Find(filter);    var files = filesCursor.ToList();    foreach (var file in files)    {     bucket.Rename(file.Id, newFilename);    }   }   } } 

using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks;  namespace MongoDemo {  public static class ImageHelper  {   /// <summary>   /// //將Image轉換成流數據，并保存為byte[]    /// </summary>   /// <param name="image"></param>   /// <returns></returns>   public static byte[] ImageToBytes(Image image)   {    ImageFormat format = image.RawFormat;    using (MemoryStream ms = new MemoryStream())    {     if (format.Equals(ImageFormat.Jpeg))     {      image.Save(ms, ImageFormat.Jpeg);     }     else if (format.Equals(ImageFormat.Png))     {      image.Save(ms, ImageFormat.Png);     }     else if (format.Equals(ImageFormat.Bmp))     {      image.Save(ms, ImageFormat.Bmp);     }     else if (format.Equals(ImageFormat.Gif))     {      image.Save(ms, ImageFormat.Gif);     }     else if (format.Equals(ImageFormat.Icon))     {      image.Save(ms, ImageFormat.Icon);     }     byte[] buffer = new byte[ms.Length];     //Image.Save()會改變MemoryStream的Position，需要重新Seek到Begin     ms.Seek(0, SeekOrigin.Begin);     ms.Read(buffer, 0, buffer.Length);     return buffer;    }   }     public static Stream ImageToStream(Image image)   {    ImageFormat format = image.RawFormat;    MemoryStream ms = new MemoryStream();     if (format.Equals(ImageFormat.Jpeg))    {     image.Save(ms, ImageFormat.Jpeg);    }    else if (format.Equals(ImageFormat.Png))    {     image.Save(ms, ImageFormat.Png);    }    else if (format.Equals(ImageFormat.Bmp))    {     image.Save(ms, ImageFormat.Bmp);    }    else if (format.Equals(ImageFormat.Gif))    {     image.Save(ms, ImageFormat.Gif);    }    else if (format.Equals(ImageFormat.Icon))    {     image.Save(ms, ImageFormat.Icon);    }    return ms;   }    //參數是圖片的路徑   public static byte[] GetPictureData(string imagePath)   {    FileStream fs = new FileStream(imagePath, FileMode.Open);    byte[] byteData = new byte[fs.Length];    fs.Read(byteData, 0, byteData.Length);    fs.Close();    return byteData;   }      /// <summary>   /// Convert Byte[] to Image   /// </summary>   /// <param name="buffer"></param>   /// <returns></returns>   public static Image BytesToImage(byte[] buffer)   {    MemoryStream ms = new MemoryStream(buffer);    Image image = System.Drawing.Image.FromStream(ms);    return image;   }    /// <summary>   /// Convert Byte[] to a picture and Store it in file   /// </summary>   /// <param name="fileName"></param>   /// <param name="buffer"></param>   /// <returns></returns>   public static string CreateImageFromBytes(string fileName, byte[] buffer)   {    string file = fileName;    Image image = BytesToImage(buffer);    ImageFormat format = image.RawFormat;    if (format.Equals(ImageFormat.Jpeg))    {     file += ".jpg";    }    else if (format.Equals(ImageFormat.Png))    {     file += ".png";    }    else if (format.Equals(ImageFormat.Bmp))    {     file += ".bmp";    }    else if (format.Equals(ImageFormat.Gif))    {     file += ".gif";    }    else if (format.Equals(ImageFormat.Icon))    {     file += ".icon";    }    System.IO.FileInfo info = new System.IO.FileInfo(Path.GetFullPath(@"DownLoadImg/")); //在當前程序集目錄中添加指定目錄DownLoadImg    System.IO.Directory.CreateDirectory(info.FullName);    File.WriteAllBytes(info+file, buffer);    return file;   }  } } 

/// <summary>  /// 手動記錄錯誤日志，不用Log4Net組件  /// </summary>  public class LogHelper  {   /// <summary>   /// 將日志寫入指定的文件   /// </summary>   /// <param name="Path">文件路徑，如果沒有該文件，剛創建</param>   /// <param name="content">日志內容</param>   public static void WriteFile(string content)   {    string Path = AppDomain.CurrentDomain.BaseDirectory + "Log";    if (!Directory.Exists(Path))    {     //若文件目錄不存在 則創建     Directory.CreateDirectory(Path);    }    Path += "//" + DateTime.Now.ToString("yyMMdd") + ".log";    if (!File.Exists(Path))    {     File.Create(Path).Close();    }    StreamWriter writer = new StreamWriter(Path, true, Encoding.GetEncoding("gb2312"));    writer.WriteLine("時間：" + DateTime.Now.ToString());    writer.WriteLine("日志信息：" + content);    writer.WriteLine("-----------------------------------------------------------");    writer.Close();    writer.Dispose();   }    /// <summary>   /// 將日志寫入指定的文件   /// </summary>   /// <param name="Path">文件路徑，如果沒有該文件，剛創建</param>   /// <param name="content">日志內容</param>   public static void WriteFile(int content)   {    string Path = AppDomain.CurrentDomain.BaseDirectory + "Log";    if (!Directory.Exists(Path))    {     //若文件目錄不存在 則創建     Directory.CreateDirectory(Path);    }    Path += "//" + DateTime.Now.ToString("yyMMdd") + ".log";    if (!File.Exists(Path))    {     File.Create(Path).Close();    }    StreamWriter writer = new StreamWriter(Path, true, Encoding.GetEncoding("gb2312"));    writer.WriteLine("時間：" + DateTime.Now.ToString());    writer.WriteLine("日志信息：" + content);    writer.WriteLine("-----------------------------------------------------------");    writer.Close();    writer.Dispose();   }     /// <summary>   /// 將日志寫入指定的文件   /// </summary>   /// <param name="erroMsg">錯誤詳細信息</param>   /// <param name="source">源位置</param>   /// <param name="fileName">文件名</param>   public static void WriteFile(string erroMsg, string source, string stackTrace, string fileName)   {    string Path = AppDomain.CurrentDomain.BaseDirectory + "Log";    if (!Directory.Exists(Path))    {     //若文件目錄不存在 則創建     Directory.CreateDirectory(Path);    }    Path += "//" + DateTime.Now.ToString("yyMMdd") + ".log";    if (!File.Exists(Path))    {     File.Create(Path).Close();    }    StreamWriter writer = new StreamWriter(Path, true, Encoding.GetEncoding("gb2312"));    writer.WriteLine("時間：" + DateTime.Now.ToString());    writer.WriteLine("文件：" + fileName);    writer.WriteLine("源：" + source);    writer.WriteLine("錯誤信息：" + erroMsg);    writer.WriteLine("-----------------------------------------------------------");    writer.Close();    writer.Dispose();   }  }