C# Stream 和 byte[] 之間的轉換

一. 二進位轉換成圖片
MemoryStream ms = new MemoryStream(bytes);
ms.Position = 0;
Image img = Image.FromStream(ms);
ms.Close();
this.pictureBox1.Image

二. C#中byte[]與string的轉碼

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[] 之間的轉換

/// 將 Stream 轉成 byte[]

public byte[] StreamToBytes(Stream stream)
{
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
// 設定當前流的位置為流的開始
stream.Seek(0, SeekOrigin.Begin);
return bytes;
}

/// 將 byte[] 轉成 Stream

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

四. Stream 和 檔案之間的轉換

將 Stream 寫入檔案

public void StreamToFile(Stream stream,string fileName)
{
// 把 Stream 轉換成 byte[]
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
// 設定當前流的位置為流的開始
stream.Seek(0, SeekOrigin.Begin);
// 把 byte[] 寫入檔案
FileStream fs = new FileStream(fileName, FileMode.Create);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(bytes);
bw.Close();
fs.Close();
}

五. 從檔案讀取 Stream

public Stream FileToStream(string fileName)
{
// 開啟檔案
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// 讀取檔案的 byte[]
byte[] bytes = new byte[fileStream.Length];
fileStream.Read(bytes, 0, bytes.Length);
fileStream.Close();
// 把 byte[] 轉換成 Stream
Stream stream = new MemoryStream(bytes);
return stream;
}