一. 二进制转换成图片
MemoryStream ms = new MemoryStream(bytes);
ms.Position = 0;
Image img = Image.FromStream(ms);
ms.Close();
this.pictureBox1.Image

二. C#中byte[]与string的转换代码

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

2、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, 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 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, 0, bytes.Length);
??? // 设置当前流的位置为流的开始
??? stream.Seek(0, 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();
}

五. 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, 0, bytes.Length);
??? fileStream.Close();
??? // 把 byte[] 转换成 Stream
??? Stream stream = new MemoryStream(bytes);
??? return stream;
}

六、Bitmap 转化为 Byte[]

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