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[ASP.net教程]Stream/Bytes[]/Image对象相互转化


Stream/Bytes[]/Image对象相互转化

 

Stream转Byte数组、Image转Byte数组、文件转Stream等

 

 

/// <summary>/// 将 Stream 转成 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);  // 设置当前流的位置为流的开始  stream.Seek(0, SeekOrigin.Begin);  return bytes;}

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

byte[] 转成 Stream
// <summary> /// 字节流转换成图片 /// </summary> /// <param name="byt">要转换的字节流</param> /// <returns>转换得到的Image对象</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 异常", ex);    return null;  }}

字节流转换成图片
/// <summary>/// 图片转换成字节流 /// </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;}

图片转换成字节流
/// <summary>/// 把图片Url转化成Image对象/// </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 异常", ex);  }  return null;}

把图片Url转化成Image对象
/// <summary>/// 把本地图片路径转成Image对象/// </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 异常", ex);    return null;  }}

把图片Url转化成Image对象

 

转自:

作者:樊勇 
出处:http://www.cnblogs.com/fanyong/