public void Dispose()
{
if (_cachedEntity != null && _mediaStream != null)
{
// Get the new entity from the Entity Framework object state manager.
ObjectStateEntry entry = this.context.ObjectStateManager.GetObjectStateEntry(_cachedEntity);
if (entry.State == EntityState.Unchanged)
{
{
var ctx = new DiscCtx(ConfigManager.ConnStr);
ctx.Attach(_cachedEntity);
_cachedEntity.MediaData.Data = _mediaStream.ToArray();
ctx.SaveChanges();
}
}
else
{
// A problem must have occurred when saving the entity to the database,
// so we should delete the entity
var mediaData = _cachedEntity.MediaData;
_cachedEntity.MediaData = null;
var ctx = new DiscCtx(ConfigManager.ConnStr);
if (mediaData != null)
{
ctx.Attach(mediaData);
ctx.DeleteObject(mediaData);
}
ctx.Attach(_cachedEntity);
ctx.DeleteObject(_cachedEntity);
throw new DataServiceException("An error occurred. The media resource could not be saved.");
}
}
}
public void DeleteStream(object entity, DataServiceOperationContext operationContext)
{
var attachment = entity as Attachment;
if (attachment == null)
{
throw new DataServiceException(500, "No such attachment");
}
try
{
// Delete the requested file by using the key value.
attachment.Person = null;
attachment.PersonWithAvatar = null;
attachment.Discussion = null;
attachment.ArgPoint = null;
var mediaData = attachment.MediaData;
attachment.MediaData = null;
if (mediaData != null)
{
context.DeleteObject(mediaData);
}
context.DeleteObject(attachment);
}
catch (IOException ex)
{
throw new DataServiceException("Error during attachment removal: ", ex);
}
}
public void RemoveAttachment(int attachmentId)
{
using (var ctx = new DiscCtx(ConfigManager.ConnStr))
{
var attachment = ctx.Attachment.FirstOrDefault(at => at.Id == attachmentId);
if (attachment == null)
{
return;
}
if (attachment.MediaData != null)
{
ctx.DeleteObject(attachment.MediaData);
}
ctx.DeleteObject(attachment);
ctx.SaveChanges();
}
}
public static void DeleteArgPoint(DiscCtx ctx, ArgPoint p)
{
p.Topic = null;
p.Person = null;
p.Comment.Clear();
p.Attachment.Clear();
p.Description = null;
try
{
ctx.DeleteObject(p);
}
catch (Exception)
{
//if person doesn't exist, ignore
}
}