public async Task WriteMessage(int dialogId, Message message)
{
var dialog = await db.Dialogs.FindAsync(dialogId);
if (dialog != null)
{
db.Entry(dialog).Collection(r => r.Messages).Load();
dialog.Messages.Add(message);
await db.SaveChangesAsync();
}
}
public async Task Update(File file)
{
db.Entry(file).State = EntityState.Modified;
await db.SaveChangesAsync();
}