我正在用c#写一个程序,需要反复访问1个图像文件。大多数时候它是有效的,但如果我的计算机运行得很快,它会在文件保存回文件系统之前尝试访问该文件,并抛出一个错误:
文件正在被另一个进程使用
我想找到一个解决这个问题的方法,但我在谷歌上的所有搜索都只能通过使用异常处理来创建检查。这违背了我的宗教信仰,所以我想知道有没有更好的方法?
我正在用c#写一个程序,需要反复访问1个图像文件。大多数时候它是有效的,但如果我的计算机运行得很快,它会在文件保存回文件系统之前尝试访问该文件,并抛出一个错误:
文件正在被另一个进程使用
我想找到一个解决这个问题的方法,但我在谷歌上的所有搜索都只能通过使用异常处理来创建检查。这违背了我的宗教信仰,所以我想知道有没有更好的方法?
当前回答
I once needed to upload PDFs to an online backup archive. But the backup would fail if the user had the file open in another program (such as PDF reader). In my haste, I attempted a few of the top answers in this thread but could not get them to work. What did work for me was trying to move the PDF file to its own directory. I found that this would fail if the file was open in another program, and if the move were successful there would be no restore-operation required as there would be if it were moved to a separate directory. I want to post my basic solution in case it may be useful for others' specific use cases.
string str_path_and_name = str_path + '\\' + str_filename;
FileInfo fInfo = new FileInfo(str_path_and_name);
bool open_elsewhere = false;
try
{
fInfo.MoveTo(str_path_and_name);
}
catch (Exception ex)
{
open_elsewhere = true;
}
if (open_elsewhere)
{
//handle case
}
其他回答
只要按预期使用异常即可。接受该文件正在使用,并再次尝试,直到操作完成。这也是最有效的,因为您不需要在执行之前浪费任何检查状态的周期。
例如,使用下面的函数
TimeoutFileAction(() => { System.IO.File.etc...; return null; } );
2秒后超时的可重用方法
private T TimeoutFileAction<T>(Func<T> func)
{
var started = DateTime.UtcNow;
while ((DateTime.UtcNow - started).TotalMilliseconds < 2000)
{
try
{
return func();
}
catch (System.IO.IOException exception)
{
//ignore, or log somewhere if you want to
}
}
return default(T);
}
我所知道的唯一方法是使用Win32独占锁API,这不是太快,但例子存在。
对于大多数人来说,一个简单的解决方案就是尝试/捕捉/睡眠循环。
也许您可以使用FileSystemWatcher并观察“已更改”事件。
我自己还没用过这个,但也许值得一试。如果对于这种情况,文件系统监控器显得有点重,那么我将使用try/catch/sleep循环。
I once needed to upload PDFs to an online backup archive. But the backup would fail if the user had the file open in another program (such as PDF reader). In my haste, I attempted a few of the top answers in this thread but could not get them to work. What did work for me was trying to move the PDF file to its own directory. I found that this would fail if the file was open in another program, and if the move were successful there would be no restore-operation required as there would be if it were moved to a separate directory. I want to post my basic solution in case it may be useful for others' specific use cases.
string str_path_and_name = str_path + '\\' + str_filename;
FileInfo fInfo = new FileInfo(str_path_and_name);
bool open_elsewhere = false;
try
{
fInfo.MoveTo(str_path_and_name);
}
catch (Exception ex)
{
open_elsewhere = true;
}
if (open_elsewhere)
{
//handle case
}
您可以返回一个任务,它会在流可用时立即提供给您。这是一个简化的解决方案,但却是一个很好的起点。是线程安全的。
private async Task<Stream> GetStreamAsync()
{
try
{
return new FileStream("sample.mp3", FileMode.Open, FileAccess.Write);
}
catch (IOException)
{
await Task.Delay(TimeSpan.FromSeconds(1));
return await GetStreamAsync();
}
}
你可以像往常一样使用这个流:
using (var stream = await FileStreamGetter.GetStreamAsync())
{
Console.WriteLine(stream.Length);
}