C＃：追加*内容*一个文本文件到另一个文本文件 [英] C#: Appending *contents* of one text file to another text file

问题描述

有可能是没有其他办法可以做到这一点，但有没有办法一个文本文件的内容追加到另一个文本文件中，而移动后清除第一？

There is probably no other way to do this, but is there a way to append the contents of one text file into another text file, while clearing the first after the move?

我知道的唯一方法是只使用一个读者和作家，这似乎是低效的大文件...

The only way I know is to just use a reader and writer, which seems inefficient for large files...

谢谢！

推荐答案

没有，我不认为有任何事情做到这一点。

No, I don't think there's anything which does this.

如果两个文件使用相同的编码，你不需要验证它们是有效的，你可以把它们作为二进制文件，如：

If the two files use the same encoding and you don't need to verify that they're valid, you can treat them as binary files, e.g.

using (Stream input = File.OpenRead("file1.txt"))
using (Stream output = new FileStream("file2.txt", FileMode.Append,
                                      FileAccess.Write, FileShare.None))
{
    input.CopyTo(output); // Using .NET 4
}
File.Delete("file1.txt");

请注意，如果 FILE1.TXT 包含字节顺序标记，你应该跳过这首以避免它 FILE2.TXT 的中间。

Note that if file1.txt contains a byte order mark, you should skip past this first to avoid having it in the middle of file2.txt.

如果你不使用.NET 4，你甚至可以使用扩展方法写你自己的 Stream.CopyTo ...相当于使交接无缝的：

If you're not using .NET 4 you can write your own equivalent of Stream.CopyTo... even with an extension method to make the hand-over seamless:

public static class StreamExtensions
{
    public static void CopyTo(this Stream input, Stream output)
    {
        if (input == null)
        {
            throw new ArgumentNullException("input)";
        }
        if (output == null)
        {
            throw new ArgumentNullException("output)";
        }
        byte[] buffer = new byte[8192];
        int bytesRead;
        while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)
        {
            output.Write(buffer, 0, bytesRead);
        }
    }
}

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