Difference between File.Replace and (File.Delete+File.Move) in C#

Today I ran into a strange problem: Since a year and several versions / tests of the application the following code has been used successfully to replace a file with an other.

今天我遇到了一个奇怪的问题：由于应用程序的一年和多个版本/测试，以下代码已成功用于替换另一个文件。

File.Replace(path + ".tmp", path, null);

This has worked locally and also with UNC paths (network shares). But today I got the following error when I used this code to replace a file on a UNC path (local still works):

这在本地以及UNC路径（网络共享）中都有效。但是今天我使用此代码替换UNC路径上的文件时出现以下错误（本地仍可正常工作）：

The process cannot access the file because it is being used by another process

该进程无法访问该文件，因为该文件正由另一个进程使用

When I use the following code instead of the above, it works:

当我使用以下代码而不是上述代码时，它可以工作：

File.Delete(path);
File.Move(path + ".tmp", path);

So my questions:

所以我的问题：

What is the difference between the two code snippets?
这两个代码片段有什么区别？
Could it be that Microsoft have changed the way 'File.Replace' works?
可能是微软改变了'File.Replace'的工作方式吗？

I'm using .Net Framework 4.0 with Visual Studio 2010.

我在Visual Studio 2010中使用.Net Framework 4.0。

Thanks in advance.

提前致谢。

4 个解决方案

#1

According to MSDN on File.Replace

根据MSDN对File.Replace的说法

File.Replace will throw an exception when...

File.Replace会在...时抛出异常

the destination file is missing.
目标文件丢失。
source and destination are on different volumes
源和目标位于不同的卷上

Which File.Delete, File.Move won't.

哪个File.Delete，File.Move不会。

#2

Here's the MSDN article on File.Replace()

这是关于File.Replace（）的MSDN文章

Creating a backup of the original appears to be the difference.

创建原始备份似乎是不同的。

#3

The article linked by Phil Murray says File.Replace replaces the contents of the file. Perhaps it is trying to open the file with write access?

Phil Murray链接的文章称File.Replace替换了文件的内容。也许它试图用写访问权限打开文件？

#4

using System;
using System.IO;

namespace FileSystemExample
{

class FileExample
{

    public static void Main()
    {
        try
        {

            string OriginalFile = path+"test.tmp";
            string FileToReplace = path+"test2.tmp";
            string BackUpOfFileToReplace = path+"test2.tmp.bac";


            Console.WriteLine("Move the contents of " + OriginalFile + " into " + FileToReplace + ", delete " + OriginalFile +
                               ", and create a backup of " + FileToReplace + ".");

            // Replace the file.
            ReplaceFile(@OriginalFile, @FileToReplace, @BackUpOfFileToReplace);

            Console.WriteLine("Done");
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

        Console.ReadLine();
    }

    // Move a file into another file, delete the original, and create a backup of the replaced file.
    public static void ReplaceFile(string FileToMoveAndDelete, string FileToReplace, string BackupOfFileToReplace)
    {
        File.Replace(FileToMoveAndDelete, FileToReplace, BackupOfFileToReplace, false);

    }
}

}

#1