CheckBox复选框
CheckBox继承于ToggleButton,而ToggleButton继承于ButtonBase基类。
案例
前端代码
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"><TextBlock Text="今晚吃什么菜?" Margin="5"/><CheckBox Name="_checkbox1" Content="红烧牛肉" Margin="5"/><CheckBox Name="_checkbox2" Content="麻婆豆腐" Margin="5"/><CheckBox Name="_checkbox3" Content="夫妻肺片" Margin="5"/><Button x:Name="_button" Content="查看菜单" Click="_button_Click"/></StackPanel>
后端代码
private void _button_Click(object sender, RoutedEventArgs e){string order = string.Empty;if (_checkbox1.IsChecked == true)order += _checkbox1.Content + ",";if (_checkbox2.IsChecked == true)order += _checkbox2.Content + ",";if (_checkbox3.IsChecked == true)order += _checkbox3.Content;if(!string.IsNullOrEmpty(order))MessageBox.Show(order);}
我们通过判断CheckBox的IsChecked属性,来获取前端用户的选择。
RadioButton单选框
RadioButton也继承于ToggleButton,作用是单项选择,所以被称为单选框。
要注意:
这个控件有一个重要属性叫GroupName
——分组名称。默认值是一个空字符串。用来指定哪些RadioButton之间是互相排斥的。
案例
前端代码
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"><TextBlock Text="今晚吃什么菜?" Margin="5"/><RadioButton Name="_RadioButton1" Content="红烧牛肉" Margin="5"/><RadioButton Name="_RadioButton2" Content="麻婆豆腐" Margin="5"/><RadioButton Name="_RadioButton3" Content="夫妻肺片" Margin="5"/><Button x:Name="_button" Content="查看菜单" Click="_button_Click"/></StackPanel>
后端代码
private void _button_Click(object sender, RoutedEventArgs e){string order = string.Empty;if (_RadioButton1.IsChecked == true)order += _RadioButton1.Content + ",";if (_RadioButton2.IsChecked == true)order += _RadioButton2.Content + ",";if (_RadioButton3.IsChecked == true)order += _RadioButton3.Content;if(!string.IsNullOrEmpty(order))MessageBox.Show(order);}
这时候我们发现无论怎么选就只能选一个。如果我们要求必须选择一荤一素怎么办?我们看看组的使用。
前端代码
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"><TextBlock Text="今晚吃什么菜?" Margin="5"/><RadioButton Name="_RadioButton1" Content="红烧牛肉" GroupName="荤菜" Margin="5"/><RadioButton Name="_RadioButton2" Content="糖醋排骨" GroupName="荤菜" Margin="5"/><RadioButton Name="_RadioButton3" Content="麻婆豆腐" GroupName="素菜" Margin="5"/><RadioButton Name="_RadioButton4" Content="清炒时蔬" GroupName="素菜" Margin="5"/><Button x:Name="_button" Content="查看菜单" Click="_button_Click"/></StackPanel>
后端代码
private void _button_Click(object sender, RoutedEventArgs e)
{string order = string.Empty;if (_RadioButton1.IsChecked == true)order += _RadioButton1.Content + ",";if (_RadioButton2.IsChecked == true)order += _RadioButton2.Content + ",";if (_RadioButton3.IsChecked == true)order += _RadioButton3.Content + ",";if (_RadioButton4.IsChecked == true)order += _RadioButton4.Content;if (!string.IsNullOrEmpty(order))MessageBox.Show(order);
}
此时再操作时我们发现,红烧牛肉和糖醋排骨只能二选一,麻婆豆腐和清炒时蔬也只能二选一。
RepeatButton重复按钮
RepeatButton,顾名思义,重复执行的按钮。就是当按钮被按下时,所订阅的回调函数会不断被执行。那么,多长时间执行一次?
我们先看看它的结构定义:
public class RepeatButton : ButtonBase
{public static readonly DependencyProperty DelayProperty;public static readonly DependencyProperty IntervalProperty;public RepeatButton();public int Delay { get; set; }public int Interval { get; set; }protected override void OnClick();protected override AutomationPeer OnCreateAutomationPeer();protected override void OnKeyDown(KeyEventArgs e);protected override void OnKeyUp(KeyEventArgs e);protected override void OnLostMouseCapture(MouseEventArgs e);protected override void OnMouseEnter(MouseEventArgs e);protected override void OnMouseLeave(MouseEventArgs e);protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e);protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e);}
1. 属性分析
RepeatButton 自身提供了两个整型属性,分别是Delay 和Interval 。
- Delay 属性:表示延时重复执行的毫秒数,就是说,RepeatButton被按下后会立即执行一次回调函数,如果您不松开鼠标,在等待Delay 毫秒后,就开始进行重复执行阶段。
- Interval 属性:表示重复执行回调函数的时间间隔毫秒数。
2. RepeatButton 应用示例
前端代码
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"><TextBlock Text="食用油准备好" Margin="5 7 5 5"/><RepeatButton Name="_Button1" Content="开始倒油" Delay="1000" Interval="500" Click="_Button1_Click" Margin="5"/></StackPanel>
后端代码
public partial class MainWindow{public MainWindow(){InitializeComponent();}int count = 1;private void _Button1_Click(object sender, RoutedEventArgs e){Console.WriteLine($"重复时间:{DateTime.Now.ToLongTimeString()} {DateTime.Now.Millisecond},重复次数:{count++}");}}
结果显示,第一次和第二次输出时间刚好为1000毫秒,也就是Delay属性在起作用。然后,从第2次开始,每两次之间的时间间隔大约为500毫秒,这是因为Interval属性被设置为500。