C#------封装文件拷贝方法

class Program
{
static void Main(string[] args)
{
//FileStream 拷贝方法封装
using(Stream fs = new FileStream(@"C:\Users\Administrator\Desktop\C#OOP练习\du.txt",FileMode.Open))
using(Stream fs1 = new FileStream(@"C:\Users\Administrator\Desktop\C#OOP练习\xie.txt",FileMode.Create))
{
Copy(fs, fs1, 4);
}
Console.WriteLine("拷贝完成");

}

static void Copy(Stream Du, Stream Xie, int size)//文件读，文件写，读取多少
{
byte[] bytes = new byte[size];
int len = 0;
while ((len = Du.Read(bytes, 0, bytes.Length)) > 0)
{
Xie.Write(bytes, 0, len);
}
}
}