c# - 如何将一个文件的内容写入另一个文件？

Question

我需要使用 File.OpenRead 和 File.OpenWrite 方法将一个文件的内容写入另一个文件。我不知道该怎么做。

如何修改以下代码以使其适合我。

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));
}

Answer 1

    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);
        }
    }

只是想知道为什么不用这个:

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