質問: value; this.NotifyProperyChanged(nameof(this.Progress)); } } public event PropertyChangedEventHandler PropertyChanged; private void NotifyProperyChanged(string name) { this.PropertyChanged?.Invoke( this, new PropertyChangedEventArgs(name) ); } } ーーーーーー
回答: private void Button_Click(object sender, RoutedEventArgs e) のprivate voidの間にasyncを入れる