(5)WPF深入解析命令
1、WPF命令
1)命令和事件的区别
- 命令可以Bingding,可以在通过地方复用命令。而事件不能绑定,复用受到限制(在不同后台文件中,不能复用)
- 命令还有CanExecute和CanExecuteChanged方法。
2)示例
命令示例:
<Button Name="ResetCenterLine" AutomationProperties.AutomationId="ID_BTN_APA_RESETCENTERLINE" Width="35" Height="35" Margin="10,0,0,0" Focusable="False" Command="{Binding CenterlineUndoRedoCommand}" CommandParameter="{x:Static local:CenterlineOperationType.ReSetCenterline}" Style="{DynamicResource Style_Button_Common_CSW_Default}" ToolTip="{DynamicResource UID_APA_Reset}" HorizontalAlignment="Center" VerticalAlignment="Center"> </Button>
后台代码
private RelayCommand<CenterlineOperationType> _centerlineUndoRedoCommand; public RelayCommand<CenterlineOperationType> CenterlineUndoRedoCommand { get { return _centerlineUndoRedoCommand ??(_centerlineUndoRedoCommand = new RelayCommand<CenterlineOperationType>( (x) => { Container.GetCommunicationModule().AsyncSendCommand(ByteString.CopyFromUtf8(x.ToString()), SendToBEOperationName.UndoRedoCenterline); })); } }

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