我应该如何检查“动态”文件可访问性（例如，在使用中） [英] How should I check "dynamic" file accessibility (e.g., in use)

问题描述

我应该如何检查是否可以为Read打开文件，包括该文件在另一个进程中正在使用的情况？

我可以捕获 IOException 我得到的地方：

进程无法访问文件'C：\ ...'，因为它正由另一个进程使用。

但我宁愿提前检查读取能力，并控制错误信息。

（我知道这会在检查和文件打开之间留下一个机会之窗，但在这种情况下该文件的性质是用户可能已手动打开它，因此预检应该捕获大多数的情况，捕获异常将处理其余的。）

建议？

How should I check if a file can be opened for Read, including cases like the file is in use in another process?
I can catch the IOException where I get:
"The process cannot access the file 'C:\...' because it is being used by another process."
but I'd rather check for Read-ability in advance, and control the error message.
(I know this leaves a "window of opportunity" between the checking and the file opening, but in this case the nature of the file is that the user may have opened it manually, so pre-checking should catch most cases, and catching the exception will handle the rest.)
Suggestions?

推荐答案

我发现这篇文章：



检查文件是否正在使用通过另一个流程 [ ^ ]

I found this article:

Check if file is being used by another process[^]

我会创建一个类似这样的函数：

I would create a function something like this:

public static bool TryOpenRead(this System.IO.FileInfo file, out System.IO.FileStream fileStream)
{
    fileStream = null;

    try
    {
        fileStream = file.OpenRead();

        return true;
    }
    catch (System.IO.IOException ioException)
    {

    }

    return false;
}

当然，这是文件信息 [ ^ ]。



这至少是唯一可靠的方法，既可以查看文件是否可以读取并同时获取文件。

Which, of course, is an extension method for FileInfo[^].

Thats at least the only reliable way to both see if the file is available for reading AND get the file at the same time.

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