Wpf 如何获取对一组单选按钮的引用并找到所选的单选按钮?
使用以下XAML如何在按钮的eventhandler中获取对所选radiobutton的引用Wpf 如何获取对一组单选按钮的引用并找到所选的单选按钮?,wpf,xaml,radio-button,selecteditem,Wpf,Xaml,Radio Button,Selecteditem,使用以下XAML如何在按钮的eventhandler中获取对所选radiobutton的引用 <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Mai
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" x:Name="myWindow">
<Grid>
<StackPanel>
<RadioButton Content="A" GroupName="myGroup"></RadioButton>
<RadioButton Content="B" GroupName="myGroup"></RadioButton>
<RadioButton Content="C" GroupName="myGroup"></RadioButton>
</StackPanel>
<Button Click="Button_Click" Height="100" Width="100"></Button>
</Grid>
</Window>
您可以使用列表框
,如中所示,其工作原理是将项目模板化为绑定到列表框项目
的IsSelected
的单选按钮
,然后将列表框绑定到属性。最简单的方法是为每个单选按钮指定一个名称,并测试了它的IsChecked性能
<RadioButton x:Name="RadioButtonA" Content="A" GroupName="myGroup"></RadioButton>
<RadioButton x:Name="RadioButtonB" Content="B" GroupName="myGroup"></RadioButton>
<RadioButton x:Name="RadioButtonC" Content="C" GroupName="myGroup"></RadioButton>
if (RadioButtonA.IsChecked) {
...
} else if (RadioButtonB.IsChecked) {
...
} else if (RadioButtonC.IsChecked) {
...
}
如果(RadioButtonA.IsChecked){
...
}否则,如果(RadioButtonB.已检查){
...
}否则如果(RadioButtonC.已检查){
...
}
但是,使用Linq和逻辑树,您可以使其不那么冗长:
myWindow.FindDescendants<CheckBox>(e => e.IsChecked).FirstOrDefault();
myWindow.finddescents(e=>e.IsChecked).FirstOrDefault();
其中FindDescents是一种可重用的扩展方法:
public static IEnumerable<T> FindDescendants<T>(this DependencyObject parent, Func<T, bool> predicate, bool deepSearch = false) where T : DependencyObject {
var children = LogicalTreeHelper.GetChildren(parent).OfType<DependencyObject>().ToList();
foreach (var child in children) {
var typedChild = child as T;
if ((typedChild != null) && (predicate == null || predicate.Invoke(typedChild))) {
yield return typedChild;
if (deepSearch) foreach (var foundDescendant in FindDescendants(child, predicate, true)) yield return foundDescendant;
} else {
foreach (var foundDescendant in FindDescendants(child, predicate, deepSearch)) yield return foundDescendant;
}
}
yield break;
}
公共静态IEnumerable FindDescents(此DependencyObject父对象,Func谓词,bool deepSearch=false),其中T:DependencyObject{
var children=logicaltreeheloper.GetChildren(parent).OfType().ToList();
foreach(儿童中的儿童变量){
var typedChild=子项为T;
if((typedChild!=null)和&(predicate==null | | predicate.Invoke(typedChild))){
收益型儿童;
if(deepSearch)foreach(finddescents中的var foundgroundant(child,predicate,true))产生返回foundgroundant;
}否则{
foreach(findDescents(子级、谓词、深度搜索)中的var foundground)产生返回foundground;
}
}
屈服断裂;
}
如果您知道您的容器ID,那么与公认的答案相比,您的答案就不那么毛茸茸了:
var radioButtons = LogicalTreeHelper.GetChildren(_myStackPanel).OfType<RadioButton>();
var selected = radioButtons.Where(x => (bool)x.IsChecked).FirstOrDefault();
var radioButtons=logicaltreeheloper.GetChildren(_myStackPanel).OfType();
var selected=单选按钮。其中(x=>(bool)x.IsChecked)。FirstOrDefault();
谢谢您的回答。我明白了[这个答案1]。可能是打字错误?