文件流转换

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;

}