如何写一个文件的内容复制到另一个文件？

问题描述

我需要编写一个文件的内容使用File.OpenRead和File.OpenWrite方法的另一个文件。我无法弄清楚如何做到这一点。

如何修改以下code为我工作。

 使用（的FileStream流= File.OpenRead（C：\\ FILE1.TXT））
使用（的FileStream writeStream = File.OpenWrite（D：\\ FILE2.TXT））
{
       读者BinaryReader在新= BinaryReader在（流）;
       的BinaryWriter作家=新的BinaryWriter（writeStream）;
       writer.Write（reader.ReadBytes（stream.Length））;
}
 

解决方案

使用

 （的FileStream流= File.OpenRead（C：\\ FILE1.TXT））
    使用（的FileStream writeStream = File.OpenWrite（D：\\ FILE2.TXT））
    {
        读者BinaryReader在新= BinaryReader在（流）;
        的BinaryWriter作家=新的BinaryWriter（writeStream）;

        //创建一个缓冲区来保存字节
        byte []的缓冲区=新的字节[1024];
        INT读取动作;

        //而读方法返回字节
        //让他们写入到输出流
        而（（读取动作=
                stream.Read（缓冲液，0，1024））＆GT; 0）
        {
            writeStream.Write（缓冲液，0，读取动作）;
        }
    }
 

只是想知道为什么不使用这样的：

  File.Copy（C：\\ FILE1.TXT，D：\\ FILE2.TXT）;
 

I need to write contents of a file to another file using File.OpenRead and File.OpenWrite methods. I am unable to figure out how to do it.

How can i modify the following code to work for me.

using (FileStream stream = File.OpenRead("C:\\file1.txt"))
using (FileStream writeStream = File.OpenWrite("D:\\file2.txt"))
{
       BinaryReader reader = new BinaryReader(stream);
       BinaryWriter writer = new BinaryWriter(writeStream);
       writer.Write(reader.ReadBytes(stream.Length));
}

解决方案

    using (FileStream stream = File.OpenRead("C:\\file1.txt"))
    using (FileStream writeStream = File.OpenWrite("D:\\file2.txt"))
    {
        BinaryReader reader = new BinaryReader(stream);
        BinaryWriter writer = new BinaryWriter(writeStream);

        // create a buffer to hold the bytes
        byte[] buffer = new Byte[1024];
        int bytesRead;

        // while the read method returns bytes
        // keep writing them to the output stream
        while ((bytesRead =
                stream.Read(buffer, 0, 1024)) > 0)
        {
            writeStream.Write(buffer, 0, bytesRead);
        }
    }

Just wonder why not to use this:

File.Copy("C:\\file1.txt", "D:\\file2.txt");

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