文件与流相关code

FileStream方式写入文件

FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
fs.Write(fileData, 0, fileData.Length); //写入流  
fs.Flush(); //清空缓冲区 
fs.Close(); //关闭流
fs.Dispose();

BinaryWriter方式写文件

FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write);
using (BinaryWriter bw = new BinaryWriter(fs))
{
    bw.Write(fileData); //写入流                    
    bw.Flush();//清空缓冲区                    
    bw.Close(); //关闭流
}
fs.Close();
fs.Dispose();

FileStream fs1 = new FileStream(@"x1.doc", FileMode.Open);
FileStream fs2 = new FileStream(@"x2.doc", FileMode.Create);
byte[] data = new byte[1024];
//创建两个缓冲流，与两个文件流相关联
BufferedStream bs1 = new BufferedStream(fs1);
BufferedStream bs2 = new BufferedStream(fs2);
while (fs1.Read(data, 0, data.Length) > 0)
{
    fs2.Write(data, 0, data.Length);
    fs2.Flush();
}
fs1.Close();
fs2.Close();

FileStream fs = new FileStream(op.FileName, FileMode.Open);
//把文件读取到字节数组
byte[] data = new byte[fs.Length];
fs.Read(data, 0, data.Length);
fs.Close();

Stream s = fileUpload.PostedFile.InputStream;
//文件临时储存Byte数组
Byte[] fileData = new Byte[fileUpload.PostedFile.ContentLength];
s.Read(fileData, 0, fileUpload.PostedFile.ContentLength);
s.Close();

FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write); 
StreamWriter sw = new StreamWriter(fs);
sw.Write(this.textBox1.Text);
sw.Flush();//清空缓冲区
sw.Close();//关闭流
fs.Close();  

//获得字节数组  
byte[] data = new System.Text.UTF8Encoding().GetBytes(this.textBox1.Text);