图片转化为二进制

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//把指定路径的图片转化为二进制 

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                public byte[] GetPictureData(string imagepath) 
        
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                { 
        
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                    //根据图片文件的路径使用文件流打开，并保存为byte[] 
        
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                    FileStream fs = new FileStream(imagepath, FileMode.Open); 
        
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                    byte[] byData = new byte[fs.Length]; 
        
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                    fs.Read(byData, 0, byData.Length); 
        
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                    fs.Close(); 
        
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                    return byData; 
        
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                } 
        
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                //把上传图片转化为二进制 
        
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                protected string btnAdd_Click(object sender, EventArgs e)//上传单击按钮 
        
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                { 
        
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                    //获得图象并把图象转换为byte[]  
        
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                    HttpPostedFile upPhoto = UpPhoto.PostedFile; 
        
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                    int upPhotoLength = upPhoto.ContentLength; 
        
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                    byte[] PhotoArray = new Byte[upPhotoLength]; 
        
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                    Stream PhotoStream = upPhoto.InputStream; 
        
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                    PhotoStream.Read(PhotoArray, 0, upPhotoLength); 
        
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                    return  Encoding.UTF8.GetString(PhotoArray); 
        
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                }    
        
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                //把图片显示在页面上 
        
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                //ContentType的类型可为1.application/octet-stream,2.image/JPEG等 
        
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                HttpContext.Current.Response.ContentType = "application/octet-stream";  
        
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                HttpContext.Current.Response.BinaryWrite(PhotoArray); 
        
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                //把二进制转化为图像 
        
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                public System.Drawing.Image ReturnPhoto(byte[] streamByte){ 
        
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                    System.IO.MemoryStream ms = new System.IO.MemoryStream(streamByte); 
        
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                    System.Drawing.Image img = System.Drawing.Image.FromStream(ms); 
        
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                    return img; 
        
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                } 
        
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                //直接把图片转化为二进制 
        
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                    public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto){ 
        
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                       //将Image转换成流数据，并保存为byte[] 
        
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                       MemoryStream mstream = new MemoryStream(); 
        
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                       imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp); 
        
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                       byte[] byData = new Byte[mstream.Length]; 
        
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                       mstream.Position = 0; 
        
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                        mstream.Read(byData, 0, byData.Length); 
        
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                       mstream.Close(); 
        
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                        return byData; 
        
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                    } 
        
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            ④ 
        
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                //字符串和二进制相互转化. 
        
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                //把字符串转化为二进制. 
        
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                public static byte[] StringToByteArray(string str) 
        
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                {        return Encoding.UTF8.GetBytes(str);    } 
        
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                //把二进制转化为字符串 
        
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                public static string ByteArrayToString(byte[] bytes) 
        
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                {        return Encoding.UTF8.GetString(bytes);    }