System.IO.File.Delete throws Arithmetic operation resulted in an overflow

Question

I have this weird error. When I call System.IO.File.Delete(), it throws

JobCleaner.CleanFiles(): Unable to delete file: D:\WorkerData\4\Run128\Run_TEMPLATE_Rail_Scenario_Type35_INFHD2_NO_TAX_NOMEP\out‌​put_panels\FileIndex55.bin

Error: Arithmetic operation resulted in an overflow.

There is no stack trace.

Here is my code:

foreach (string strFile in System.IO.Directory.GetFiles(strFolder))
{
    try { System.IO.File.Delete(strFile); }
    catch (Exception ex)
    {
        //Exception here
        AddToLog("JobCleaner.CleanFiles(): Error occurred when trying to delete file \"" + strFile + "\".\nError:\n" + ex.Message);
        return false;
    }
}

Any idea? I tried everything, I check the security on the folder. I enabled "Everyone" with full controls, but still encounter this "Arithmetic operation resulted in an overflow" exception.

Can anyone help, please? I am using Windows 2012 R2 Datacenter to run my application.

Answer 1

I wouldn't expect it to throw an arithmetic exception, but I have observed some weird behavior when you modify an IEnumerable within the foreach that is walking it. Try moving the file listing out of the loop, like this:

string[] files = System.IO.Directory.GetFiles(strFolder);
foreach (string strFile in files)
{
  try { System.IO.File.Delete(strFile); }
  catch (Exception ex)
  {
    //Exception here
    AddToLog("JobCleaner.CleanFiles(): Error occurred when trying to delete file \"" + strFile + "\".\nError:\n" + ex.Message);
    return false;
  }
}