How Can I Efficiently Detect File Locks Without Using Try-Catch Blocks?

Efficiently detect file locking and avoid using Try/Catch blocks

In programming, it is a common problem to determine whether a file is locked without relying on try-catch blocks. A reliable solution is to use a custom class FileManager to encapsulate file access operations:

Custom file manager class:

public class FileManager
{
    ...
    private FileStream GetStream(FileAccess fileAccess)
    {
        int tries = 0;
        while (true)
        {
            try
            {
                return File.Open(_fileName, FileMode.Open, fileAccess, FileShare.None); //尝试打开文件
            }
            catch (IOException e)
            {
                if (!IsFileLocked(e)) // 检查文件是否被锁定
                    throw;
                if (++tries > _numberOfTries) //如果达到最大尝试次数
                    throw new MyCustomException("文件锁定时间过长: " + e.Message, e);
                Thread.Sleep(_timeIntervalBetweenTries); //等待后再重试
            }
        }
    }

    ...
}

File Lock Detection:

private static bool IsFileLocked(IOException exception)
{
    int errorCode = Marshal.GetHRForException(exception) & 0xFFFF; // 获取错误代码
    return errorCode == 32; // 检查错误代码是否为32 (共享冲突)
}

This method allows you to repeatedly try file access at specified intervals until the file is successfully opened or the predetermined number of retries is exceeded. By providing a fine-grained method of detecting file locks, you can avoid the overhead of try-catch blocks while keeping file access operations robust and controllable.

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