C#基础问题希望得到您的帮助5

Question

namespace 文件流复制
{
    class Program
    {
        static void Main(string[] args)
        {
            CopyFile("e:\\内容.txt","e:\\内容太.txt");
            Console.WriteLine("复制完成");
            Console.Read();
        }
        static void CopyFile(string srcName, string decName)
        {
                        using (FileStream fs = File.OpenRead(srcName))
            {
                using (FileStream decStream = File.OpenWrite(decName))
                {
                    //int bufferSize = 1024;
                    //byte[] buffer = new byte[bufferSize];                    CopyStream(fs, decStream, 1024);
                }                //int bufferSize=1024;
                //byte[] buffer = new byte[bufferSize];                
            }
        }
        static void CopyStream(Stream srcStream, Stream decStream,int bufferSize)
        {
            byte[] buffer = new byte[bufferSize];
            int n;
            while ((n = srcStream.Read(buffer, 0, bufferSize)) > 0)
            {
                decStream.Write(buffer, 0, n);
                srcStream.Position = decStream.Position;
            }
            
        }
    }
}
问题是：FileStream decStream = File.OpenWrite(decName)
这行代码说明 decName 不存在，是先创建文件以后再写入
还是先在主函数里创建文件
 CopyFile("e:\\内容.txt","e:\\内容太.txt");

Answer 1

希望大手解释一下这句话的含义FileStream decStream = File.OpenWrite(decName)

Answer 2

你这个 CopyFile是 COPY文件。
当然得先有文件e:\\内容.txt
他去复制一个e:\\内容太.txt的文件