C#复制大文件，控制台程序的实例教程

1.Main方法

static void Main(string[] args) {
 string source = @"C:\Users\Administrator\Desktop\test.txt";//源文件路径
 string target = @"C:\Users\Administrator\Desktop\text.txt";//目标文件路径
 float percent = 0;//控制台输出拷贝进度，百分比格式
 CopyFile(source, target, ref percent);//调用拷贝文件的方法
}

2.CopyFile方法

static void CopyFile(string source, string target, ref float percent,int bufferSize = 1024*1024*10) {
byte[] array = new byte[bufferSize];//创建缓冲区
using (FileStream fsRead = File.Open(source, FileMode.Open, FileAccess.Read)) {
using (FileStream fsWrite = File.Open(target, FileMode.Create, FileAccess.Write)) {
  while (fsRead.Position < fsRead.Length) {
  //读取到文件缓冲区
int length = fsRead.Read(array, 0, array.Length);
//从缓冲区写到新文件
fsWrite.Write(array, 0, length);
//计算进度
percent = (float)fsRead.Position / fsRead.Length;
//输出进度
Console.WriteLine(percent.ToString("p"));
  }
  }
 }
}