Question

我在捕捉异常方面遇到了一些麻烦：

private static void WriteLog(string line, string currentDirectory, string dataLocation, int retries)
{
    string localPath = currentDirectory + dataLocation;
    // Write CSV header if the log file does not yet exist
    bool writeHeader = !File.Exists(localPath);
    try
    {
        using (StreamWriter sw = File.AppendText(localPath))
        {
            LogMessage("Log file opened. Writing...");
            if (writeHeader)
                sw.WriteLine(csvHeader);
            sw.WriteLine(line);
            sw.Close();
            LogMessage("Wrote line successfully. Log file closing.");
        }
    }
    catch (IOException e)
    {
        if (++retries > 3) return;
        LogMessage($"Cannot write to file because it is open. Retrying.. {retries}/3 (Exception: {e.Message})");
        var retryDuration = TimeSpan.FromTicks(ApplicationSettings.AnalysisInterval.Ticks / 3);
        Thread.Sleep(retryDuration);
        WriteLog(line, currentDirectory, dataLocation, retries);
    }
    LogMessage($"Logged line after {retries} retries.");
    Task.Run(() => DropboxUploader.UploadCsv(localPath, dataLocation));
}

StreamWriter sw = File.AppendText（localPath）是抛出IOException的行。正如您所看到的，我尝试使用try / catch块捕获它，但IOException仍然被抛出。这似乎也发生在其他例外情况下。有人知道为什么异常仍然被抛出？

Answer 1

try-clause中抛出的所有IOExceptions都将在catch子句中捕获。要么它不是被抛出的IOException，也许它只是一个例外？

或者，如果它是抛出的IOException，则它源自try子句之后发生的事情。

EG。我注意到你在catch子句和try-catch子句之后尝试记录东西。我猜你把数据写入文件，如果出现问题，最有可能抛出IOException

捕捉异常并不起作用

1 个答案: