在C#Mono Debian中读取文件不起作用
本文关键字:文件 不起作用 读取 C#Mono Debian | 更新日期: 2023-09-27 18:01:05
我在Debian上使用MonoDevelop,我对以下代码有问题:
using (StreamReader sr = new StreamReader(File.Open(e.FullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
它在Windows中运行良好,通过MonoDevelop运行时运行良好。但是,如果我像mono output.exe
或sudo mono output.exe
一样运行它,那么第一次调用带有此代码的方法就可以了。但第二次失败了。它不写任何东西,不会抛出异常。我也尝试过用try catch finally
替换using
,但没有抛出异常。我认为它就是无法读取文件。
具有此代码的方法由FileSystemWatcher更改事件调用。我正在通过VIM更改文件。
有什么想法吗?我该如何找出问题所在?为什么在MonoDevelop中它工作得很好(所以我无法跟踪它(,如果从终端运行,它只是第一次工作(方法总是被调用,但文件没有被读取,也没有抛出异常,它甚至不会使用{}进入内部(。
谢谢!
在3.2.8下,我遇到了一个与文件观察程序事件未触发有关的不同问题(已知问题已修复(。使用3.12.1或4.0.x+,以下代码对我来说很好,但这不适用于R-PI。在你的RPI Debian/Mono 3.2.8安装中尝试一下,看看它是否是一个与R-PI相关的错误/问题。
示例输出(按Ctrl-C退出(:
>>mcs Program.cs
>>mono Program.exe
Created watcher for /var/folders/hc/xf7j8x7j72dg7g098mwkhbs40000gp/T/tmp438e6660.tmp
Changed: '/var/folders/hc/xf7j8x7j72dg7g098mwkhbs40000gp/T/tmp438e6660.tmp', type: Changed
0Changed: '/var/folders/hc/xf7j8x7j72dg7g098mwkhbs40000gp/T/tmp438e6660.tmp', type: Changed
01Changed: '/var/folders/hc/xf7j8x7j72dg7g098mwkhbs40000gp/T/tmp438e6660.tmp', type: Changed
012Changed: '/var/folders/hc/xf7j8x7j72dg7g098mwkhbs40000gp/T/tmp438e6660.tmp', type: Changed
0123Changed: '/var/folders/hc/xf7j8x7j72dg7g098mwkhbs40000gp/T/tmp438e6660.tmp', type: Changed
示例程序.cs
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace FileWatcher
{
class Program
{
static int counter = 0;
public static void Main (string[] args)
{
var tempDir = Path.GetTempPath ();
var tempFile = Path.GetTempFileName ();
var fsw = new FileSystemWatcher (tempDir, Path.GetFileName (tempFile));
fsw.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.Size;
fsw.Changed += WatcherOnChanged;
fsw.EnableRaisingEvents = true;
Console.WriteLine ("Created watcher for {0}", tempFile);
var cts = new CancellationTokenSource ();
Console.CancelKeyPress += (s, e) => {
e.Cancel = true;
cts.Cancel ();
};
MainAsync (tempFile, cts.Token).Wait ();
fsw.Dispose ();
File.Delete (tempFile);
}
static async Task MainAsync (string fileName, CancellationToken token)
{
while (!token.IsCancellationRequested) {
WriteFile (fileName);
Thread.Sleep (2000);
}
}
private static void WatcherOnChanged (object sender, FileSystemEventArgs eventArgs)
{
Console.WriteLine ("Changed: '{0}', type: {1}", eventArgs.FullPath, eventArgs.ChangeType);
ReadFile (eventArgs.FullPath);
}
private static void ReadFile (string fileName)
{
using (var sr = new StreamReader (File.Open (fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))) {
Console.Write (sr.ReadLine ());
}
}
private static void WriteFile (string fileName)
{
using (var sr = new StreamWriter (fileName, true)) {
sr.Write (counter++);
}
}
}
}