/// <summary>/// 將 Stream 轉(zhuǎn)成 byte[]/// </summary>/// <param name="stream"></param>/// <returns></returns>public static byte[] StreamToBytes(Stream stream){    byte[] bytes = new byte[stream.Length];    stream.Read(bytes, 0, bytes.Length);    // 設(shè)置當(dāng)前流的位置為流的開始    stream.Seek(0, SeekOrigin.Begin);    return bytes;}

/// <summary>/// 將 byte[] 轉(zhuǎn)成 Stream/// </summary>/// <param name="bytes"></param>/// <returns></returns>public static Stream BytesToStream(byte[] bytes){    Stream stream = new MemoryStream(bytes);    return stream;}

// <summary> /// 字節(jié)流轉(zhuǎn)換成圖片 /// </summary> /// <param name="byt">要轉(zhuǎn)換的字節(jié)流</param> /// <returns>轉(zhuǎn)換得到的Image對(duì)象</returns> public static Image BytToImg(byte[] byt){    try    {        MemoryStream ms = new MemoryStream(byt);        Image img = Image.FromStream(ms);        return img;    }    catch (Exception ex)    {        LogHelper.WriteError("StreamHelper.BytToImg 異常", ex);        return null;    }}

/// <summary>///  圖片轉(zhuǎn)換成字節(jié)流 /// </summary>/// <param name="img"></param>/// <returns></returns>public static byte[] ImageToByteArray(Image img){    ImageConverter imgconv = new ImageConverter();    byte[] b = (byte[])imgconv.ConvertTo(img, typeof(byte[]));    return b;}

/// <summary>/// 把圖片Url轉(zhuǎn)化成Image對(duì)象/// </summary>/// <param name="imageUrl"></param>/// <returns></returns>public static Image Url2Img(string imageUrl){    try    {        if (string.IsNullOrEmpty(imageUrl))        {            return null;        }        WebRequest webreq = WebRequest.Create(imageUrl);        WebResponse webres = webreq.GetResponse();        Stream stream = webres.GetResponseStream();        Image image;        image = Image.FromStream(stream);        stream.Close();        return image;    }    catch (Exception ex)    {        LogHelper.WriteError("StreamHelper.Url2Img 異常", ex);    }    return null;}

/// <summary>/// 把本地圖片路徑轉(zhuǎn)成Image對(duì)象/// </summary>/// <param name="imagePath"></param>/// <returns></returns>public static Image ImagePath2Img(string imagePath){    try    {        if (string.IsNullOrEmpty(imagePath))        {            return null;        }        byte[] bytes = Image2ByteWithPath(imagePath);        Image image = BytToImg(bytes);        return image;    }    catch (Exception ex)    {        LogHelper.WriteError("StreamHelper.ImagePath2Img 異常", ex);        return null;    }}