在另一个进程正在使用文件时如何复制文件 [英] How to copy a file while it is being used by another process

问题描述

是否可以同时复制另一个进程正在使用的文件？

Is it possible to copy a file which is being using by another process at the same time?

我问，因为当我尝试使用以下代码引发异常：

I ask because when i am trying to copy the file using the following code an exception is raised:

 System.IO.File.Copy(s, destFile, true);

引发的异常是：

该进程无法访问文件'D：\temp\1000000045.zip'，因为该文件正在被另一个进程使用。

The process cannot access the file 'D:\temp\1000000045.zip' because it is being used by another process.

我不想创建一个新文件，我只想复制或删除它。

I do not want to create a new file, I just want to copy it or delete it. Is this possible?

推荐答案

示例（注意：我只是将两个google结果合并在一起，您可能必须修复一些小错误;） ）

An Example (note: I just combined two google results, you may have to fix minor errors ;))

重要的部分是打开FileStream时的 FileShare.ReadWrite 。

The important part is the FileShare.ReadWrite when opening the FileStream.

我使用类似的代码打开和读取Excel文档，而excel仍处于打开状态并阻止文件。

I use a similar code to open and read Excel documents while excel is still open and blocking the file.

using (var inputFile = new FileStream(
    "oldFile.txt",
    FileMode.Open,
    FileAccess.Read,
    FileShare.ReadWrite))
{
    using (var outputFile = new FileStream("newFile.txt", FileMode.Create))
    {
        var buffer = new byte[0x10000];
        int bytes;

        while ((bytes = inputFile.Read(buffer, 0, buffer.Length)) > 0)
        {
            outputFile.Write(buffer, 0, bytes);
        }
    }
}

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