void StartReload()
{
// Apart from retrying, the DelayedActions has the nice side effect of also
// collapsing multiple file system events into one action callback.
_retries = 3;
string temp = this._fileName; // capture file name in case it changes.
_actions.StartDelayedAction("reload", () => { CheckReload(temp); }, TimeSpan.FromSeconds(1));
}
internal void CheckReload(FileChangedActions action, string fileName)
{
if (!File.Exists(fileName))
{
// file was deleted...
return;
}
pending = null;
try
{
// Only do the reload if the file on disk really is different from
// what we last loaded.
if (this._lastModified < LastModTime && this._fileName == fileName)
{
// Test if we can open the file (it might still be locked).
using (FileStream fs = new FileStream(this._fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
fs.Close();
}
FireFileChanged();
}
}
catch (Exception ex)
{
_retries--;
if (_retries > 0)
{
Debug.WriteLine("Retrying after FileStream error: " + ex.Message);
// perhaps the file is still locked by the writer, so try again in a bit.
_actions.StartDelayedAction("reload", () => action.HandleReload(), TimeSpan.FromSeconds(1));
}
else
{
Debug.WriteLine("Giving up after FileStream error: " + ex.Message);
}
}
}
