public InvalidDownloadStateChangeException(DownloadStateEnum oldState, DownloadStateEnum newState,
string message) : base(message)
{
NewState = newState;
OldState = oldState;
}
private void ChangeDownloadStateWithPublishEvent(DownloadStateEnum state)
{
if (DownloadState == state)
{
return;
}
var temp = DownloadState;
DownloadState = state;
EventAggregator.GetEvent <DownloadStateChangedEvent>().Publish(new DownloadStateChangedEventArgs(FileId, temp, DownloadState));
}
private bool CheckArgs(DownloadStateEnum oldState, DownloadStateEnum newState)
{
if (oldState == DownloadStateEnum.Canceled ||
oldState == DownloadStateEnum.Completed ||
oldState == DownloadStateEnum.Faulted ||
newState == DownloadStateEnum.Created)
{
return(false);
}
return((StateChangeRule[oldState] & newState) == newState);
}
public DownloadStateChangedEventArgs(long fileId, DownloadStateEnum oldState, DownloadStateEnum newState)
{
#if DEBUG
if (!CheckArgs(oldState, newState))
{
throw new InvalidDownloadStateChangeException(oldState, newState, $"{oldState} can not be converted to {newState}.");
}
#endif
FileId = fileId;
OldState = oldState;
NewState = newState;
}
private void btnAction_Click(object sender, EventArgs e)
{
switch (DownloadState)
{
case DownloadStateEnum.Available:
_server.DownloadData(WebAddress, AppDomain.CurrentDomain.BaseDirectory + "Handouts/" + _id + " - " + Title);
DownloadState = DownloadStateEnum.Downloading;
break;
case DownloadStateEnum.Downloading:
_server.CancelAsync();
DownloadState = DownloadStateEnum.Available;
break;
case DownloadStateEnum.Downloaded:
System.Diagnostics.Process.Start(AppDomain.CurrentDomain.BaseDirectory + "Handouts/" + _id + " - " + Title);
break;
}
}
public StateChangedArgs(DownloadStateEnum oldState, DownloadStateEnum newState)
{
this.OldState = oldState;
this.NewState = newState;
}
private void _server_DownloadDataCompleted(object sender, System.Net.DownloadDataCompletedEventArgs e)
{
DownloadState = DownloadStateEnum.Downloaded;
}
