Stream转Byte数组、Image转Byte数组、文件转Stream等

/// 
/// 将 Stream 转成 byte[]/// 
/// /// 
    public static byte[] StreamToBytes(Stream stream){    byte[] bytes = new byte[stream.Length];    stream.Read(bytes, 0, bytes.Length);    // 设置当前流的位置为流的开始    stream.Seek(0, SeekOrigin.Begin);    return bytes;}/// 
/// 将 byte[] 转成 Stream/// 
/// /// 
    public static Stream BytesToStream(byte[] bytes){    Stream stream = new MemoryStream(bytes);    return stream;}/// 
 /// 字节流转换成图片 /// 
 /// 要转换的字节流 /// 
    
     转换得到的Image对象
     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 异常", ex);        return null;    }}/// 
///  图片转换成字节流 /// 
/// /// 
    public static byte[] ImageToByteArray(Image img){    ImageConverter imgconv = new ImageConverter();    byte[] b = (byte[])imgconv.ConvertTo(img, typeof(byte[]));    return b;}/// 
/// 把图片Url转化成Image对象/// 
/// /// 
    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 异常", ex);    }    return null;}/// 
/// 把本地图片路径转成Image对象/// 
/// /// 
    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 异常", ex);        return null;    }}

详细代码看