C# 文件流相关操作

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

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);

C# Stream 和 byte[] 之间的转换:

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;
}

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();
}

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 StreamStream stream = new MemoryStream(bytes);return stream;
}