Command带参数

一.带一个参数

        #region 有一个参数command
        public ICommand BtnCommand => new DelegateCommand<string>(Execute);

        private async void Execute(string str)
        {
            //await Task.Delay(2000);
            MessageBox.Show(str);
        }
        #endregion

     <Button Command="{Binding BtnCommand}" CommandParameter="{Binding Value123}" Content="Button" HorizontalAlignment="Left" Height="61" Margin="145,139,0,0" VerticalAlignment="Top" Width="153"/>

重点是

CommandParameter="{Binding Value123}"，绑定viewmodel的属性