如何在C#WPF中获取和绑定Slider的值？
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How to get and bind the value of Slider in C# WPF?
提问by Samet
I can get the value of slider here:
我可以在这里获取滑块的值：
public void TheSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
int k = (int)TheSlider.Value;
Debug.WriteLine(k);
}
In this part, I cant get the value, so I cant use it :
在这部分，我无法获得价值，所以我无法使用它：
private void Window_Loaded(object sender, RoutedEventArgs e)
{
_runtime.NuiCamera.ElevationAngle = (int)TheSlider.Value;
}
This is the slider code in xaml:
这是 xaml 中的滑块代码：
<Slider x:Name="TheSlider"
DockPanel.Dock="Left"
Orientation="Horizontal"
HorizontalAlignment="Center"
HorizontalContentAlignment="Center"
Minimum="-27"
Maximum="27"
Cursor="Hand"
IsSnapToTickEnabled="True"
Margin="322,392,329,87" ValueChanged="TheSlider_ValueChanged" Width="144" />
What is the problem here? Can you help me please?
这里有什么问题？你能帮我吗？
UPDATE:
更新：
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
System.Windows.Data.Binding b = new System.Windows.Data.Binding();
b.ElementName = "TheSlider";
b.Path = new PropertyPath("Value");
SetBinding(ElevationAngleProperty, b);
}
public int ElevationAngle
{
get { return _runtime.NuiCamera.ElevationAngle; }
set { _runtime.NuiCamera.ElevationAngle = value; OnPropertyChanged("ElevationAngle"); }
}
public DependencyProperty ElevationAngleProperty { get; set; }
回答by Avani Vadera
If ElevationAngle is a dependency property,You can directly bind dependency property to the slider value.
如果 ElevationAngle 是依赖属性，则可以直接将依赖属性绑定到滑块值。
Do this in OnApplyTemplate function
在 OnApplyTemplate 函数中执行此操作
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
Binding b = new Binding();
b.ElementName = "TheSlider";
b.Path = new PropertyPath("Value");
SetBinding(ElevationAngleProperty, b);
}
If it is regular CLR property then bind value property of slider with ElevationAngle
如果是常规的 CLR 属性，则将滑块的值属性与 ElevationAngle 绑定
<Slider x:Name="TheSlider" DockPanel.Dock="Left" Orientation="Horizontal" HorizontalAlignment="Center" HorizontalContentAlignment="Center" Minimum="-27" Maximum="27" Cursor="Hand" IsSnapToTickEnabled="True" Margin="322,392,329,87" ValueChanged="TheSlider_ValueChanged" Width="144" Value="{Binding Path=ElevationAngle,Mode=OneWayToSource}"
/>
Note that here ElevationAngle should send notification when changed
请注意，此处 ElevationAngle 应在更改时发送通知
public int ElevationAngle
{
get { return _elevationAngle ; }
set { _elevationAngle = value; OnPropertyChanged("ElevationAngle ");}
}
回答by Goot
When I just want to set the value of my sliders as content of a Label, I simply go with this:
当我只想将滑块的值设置为标签的内容时，我只需这样做：
<Label Content="{Binding ElementName=mySlider, Path=Value}"/>
When you want to show the value as an integer you just have to save your value everytime your slider changes its value.
当您想将值显示为整数时，您只需在每次滑块更改其值时保存您的值。
<Slider Name="mySlider" ValueChanged="SliderValueChanged" />
...
this.sliderValue = (int) mySlider.Value;
Then bind the content of your label to it.
然后将标签的内容绑定到它。
