C# 检查文件是否正在使用
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Check if file is in use
提问by user2099024
Hi guys I need some help. I'm trying to open a textfile on a servern from multiple clients at the same time so I'm not locking the file when reading from it. Like this:
嗨，伙计们，我需要一些帮助。我试图同时从多个客户端打开服务器上的文本文件，因此在读取文件时我没有锁定文件。像这样：
new StreamReader(File.Open(logFilePath,
FileMode.Open,
FileAccess.Read,
FileShare.ReadWrite))
Now I'm trying to check if this file is used by any of the clients (because I want to write something new to it), but since I'm not locking it when reading from it I don't know how to do this. I can't try to open and catch an exception because it will open.
现在我试图检查这个文件是否被任何客户端使用（因为我想给它写一些新的东西），但是因为我在读取它时没有锁定它，所以我不知道如何做到这一点. 我无法尝试打开并捕获异常，因为它会打开。
采纳答案by Tigran
I can't try to open and catch an exception because it will open
我无法尝试打开并捕获异常，因为它会打开
Why ? It's a valuable option to work in that way.
为什么 ？以这种方式工作是一个有价值的选择。
By the way you can also create a some empty predefined file, say "access.lock", and others, in order to understand if the actualfile is locked check on lock file presence:
顺便说一句，您还可以创建一些空的预定义文件，例如“access.lock”等，以了解实际文件是否已锁定，检查锁定文件是否存在：
if(File.Exist("access.lock"))
//locked
else
//write something
回答by Mehdi Bugnard
Do you can try this?
你可以试试这个吗？
Or watch this question already asked here ->Is there a way to check if a file is in use?
或者观看这里已经问过的这个问题 ->有没有办法检查文件是否正在使用？
protected virtual bool IsFileLocked(FileInfo file)
{
FileStream stream = null;
try
{
stream = file.Open(FileMode.Open, FileAccess.ReadWrite, FileShare.None);
}
catch (IOException)
{
//the file is unavailable because it is:
//still being written to
//or being processed by another thread
//or does not exist (has already been processed)
return true;
}
finally
{
if (stream != null)
stream.Close();
}
//file is not locked
return false;
}
