将日志刷新到磁盘，VerifyOSHandlePosition 中出现异常

发布于 2025-01-03 15:59:51 字数 913 浏览 1 评论 0原文

如何从 C# 服务写入日志文件以便及时将其刷新到磁盘？

这是我尝试过的。在日志记录代码中，我打开了一个像这样的文件：

var file = return File.Open(name, FileMode.Append, 
                            FileAccess.Write, FileShare.Read);
var writer = new StreamWriter(file);

并像这样写入它：

writer.WriteLine(msg);
writer.Flush();
file.Flush();

但是日志没有及时刷新到磁盘。因此，我尝试添加一个 5 秒计时器来执行此操作：

[DllImport("kernel32.dll")]
static extern bool FlushFileBuffers(IntPtr hFile);

file.Flush();
var hdl = file.SafeFileHandle;
FlushFileBuffers(hdl.DangerousGetHandle());

这似乎有效，但偶尔会出现以下异常：

System.IO.IOException: The OS handle's position is not what FileStream expected. Do not use a handle simultaneously in one FileStream and in Win32 code or another FileStream. This may cause data loss.

at System.IO.FileStream.VerifyOSHandlePosition()

有更好的方法强制刷新吗？

原文

How can I write a logfile from a C# service so that it gets flushed to disk in a timely fashion?

Here's what I've tried. In logging code, I opened a file like this:

var file = return File.Open(name, FileMode.Append, 
                            FileAccess.Write, FileShare.Read);
var writer = new StreamWriter(file);

and wrote to it like this:

writer.WriteLine(msg);
writer.Flush();
file.Flush();

However the log was not flushed to disk in a timely fashion. So I tried adding a 5-second timer that does this:

[DllImport("kernel32.dll")]
static extern bool FlushFileBuffers(IntPtr hFile);

file.Flush();
var hdl = file.SafeFileHandle;
FlushFileBuffers(hdl.DangerousGetHandle());

This appears to work, but at infrequent intervals I get the following exception:

System.IO.IOException: The OS handle's position is not what FileStream expected. Do not use a handle simultaneously in one FileStream and in Win32 code or another FileStream. This may cause data loss.

at System.IO.FileStream.VerifyOSHandlePosition()

Is there a better way to force the flush?

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