C#实现Stream与byte[]之间的转换实例教程

一、二进制转换成图片

MemoryStream ms = new MemoryStream(bytes);
ms.Position = ;
Image img = Image.FromStream(ms);
ms.Close();
this.pictureBox1.Image

二、C#中byte[]与string的转换代码

.System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
byte[] inputBytes =converter.GetBytes(inputString);
string inputString = converter.GetString(inputBytes);

.string inputString = System.Convert.ToBase64String(inputBytes);
byte[] inputBytes = System.Convert.FromBase64String(inputString); 

FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);

三、C# Stream 和 byte[] 之间的转换

.将 Stream 转成 byte[]
public byte[] StreamToBytes(Stream stream)
{
  byte[] bytes = new byte[stream.Length];
  stream.Read(bytes, , bytes.Length);
  // 设置当前流的位置为流的开始
  stream.Seek(, SeekOrigin.Begin);
  return bytes;
} 

.将 byte[] 转成 Stream
public Stream BytesToStream(byte[] bytes)
{
  Stream stream = new MemoryStream(bytes);
  return stream;
}

四、Stream 和 文件之间的转换

.将 Stream 写入文件
public void StreamToFile(Stream stream,string fileName)
{
  // 把 Stream 转换成 byte[]
  byte[] bytes = new byte[stream.Length];
  stream.Read(bytes, , bytes.Length);
  // 设置当前流的位置为流的开始
  stream.Seek(, SeekOrigin.Begin);
  // 把 byte[] 写入文件
  FileStream fs = new FileStream(fileName, FileMode.Create);
  BinaryWriter bw = new BinaryWriter(fs);
  bw.Write(bytes);
  bw.Close();
  fs.Close();
}

.从文件读取 Stream
public Stream FileToStream(string fileName)
{
  // 打开文件
  FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
  // 读取文件的 byte[]
  byte[] bytes = new byte[fileStream.Length];
  fileStream.Read(bytes, , bytes.Length);
  fileStream.Close();
  // 把 byte[] 转换成 Stream
  Stream stream = new MemoryStream(bytes);
  return stream;
}

六、Bitmap 转化为 Byte[] 

Bitmap BitReturn = new Bitmap();
byte[] bReturn = null;
MemoryStream ms = new MemoryStream();
BitReturn.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
bReturn = ms.GetBuffer();

转自：http://www.jb51.net/article/54573.htm