将String转化成Stream，将Stream转换成String, C# Stream 和 byte[] 之间的转换(文件流的应用)

       static void Main( string[] args )
        {
            string str = "Testing 1-2-3";             //convert string 2 stream
            byte[] array = Encoding.ASCII.GetBytes(str);
            MemoryStream stream = new MemoryStream(array);             //convert stream 2 string
            StreamReader reader = new StreamReader(stream);
            string text = reader.ReadToEnd();
            Console.WriteLine(text);
            Console.ReadLine();
       }

/// 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;
}

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();
}

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

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