[英]WPF/C# - example for programmatically create & use Radio Buttons
有人可以指出在C#WPF中如何以编程方式创建和使用单选按钮的示例吗?
因此,基本上,如何(a)以编程方式创建它们,以及(b)如何在值更改时捕获触发器,(c)如何在给定时间获取结果。
也将有兴趣查看答案是否也将基于绑定方法的使用。 如果数据绑定是最简单的方法,那么举个例子。 否则,如果不需要数据绑定是最好/最简单的方法,那么基于非数据绑定的示例将是不错的选择。
笔记:
请注意,我当前拥有的父节点是StackPanel,所以问题的一个方面是如何将多个RadioButtons添加到StackPanelI中。
应该指出,我不知道在编译时会有多少个单选按钮,也不知道在运行时会发现什么文字。
它是WPF应用程序(即台式机,而不是Web应用程序)
通常,我们使用RadioButtons向用户展示Enum数据类型。 我们通常要做的是使用ItemsControl呈现一组RadioButton,每个RadioButton绑定到一个ViewModel。
下面是我刚刚编写的示例应用程序,演示了如何以两种方式使用RadioButtons:第一种是某种直接方法(这可以回答您上面的问题),第二种是使用MVVM方法。
顺便说一句,这只是我很快写的东西(是的,我有很多时间在手上),所以我不会说这里的一切都是做事的完美方式。 但我希望对您有帮助:
XAML:
<Window x:Class="RadioButtonSample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:RadioButtonSample"
Title="MainWindow" Height="350" Width="525">
<StackPanel>
<StackPanel x:Name="sp"/>
<Button x:Name="showChoice" Click="showChoice_Click">Show Choice</Button>
<StackPanel x:Name="sp2">
<StackPanel.DataContext>
<local:ViewModel/>
</StackPanel.DataContext>
<ItemsControl x:Name="itemsControl" ItemsSource="{Binding Path=Choices}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton IsChecked="{Binding Path=IsChecked}" Content="{Binding Path=Choice}" GroupName="ChoicesGroup"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<Button x:Name="showChoice2" Click="showChoice2_Click">Show Choice2</Button>
</StackPanel>
</StackPanel>
后台代码:
using System;
using System.Collections;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Collections.Generic;
namespace RadioButtonSample
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
//Initialize the first group of radio buttons and add them to the panel.
foreach (object obj in Enum.GetValues(typeof(ChoicesEnum)))
{
RadioButton rb = new RadioButton() { Content = obj, };
sp.Children.Add(rb);
rb.Checked += new RoutedEventHandler(rb_Checked);
rb.Unchecked += new RoutedEventHandler(rb_Unchecked);
}
}
void rb_Unchecked(object sender, RoutedEventArgs e)
{
Console.Write((sender as RadioButton).Content.ToString() + " checked.");
}
void rb_Checked(object sender, RoutedEventArgs e)
{
Console.Write((sender as RadioButton).Content.ToString() + " unchecked.");
}
private void showChoice_Click(object sender, RoutedEventArgs e)
{
foreach (RadioButton rb in sp.Children)
{
if (rb.IsChecked == true)
{
MessageBox.Show(rb.Content.ToString());
break;
}
}
}
private void showChoice2_Click(object sender, RoutedEventArgs e)
{
//Show selected choice in the ViewModel.
ChoiceVM selected = (sp2.DataContext as ViewModel).SelectedChoiceVM;
if (selected != null)
MessageBox.Show(selected.Choice.ToString());
}
}
//Test Enum
public enum ChoicesEnum
{
Choice1,
Choice2,
Choice3,
}
//ViewModel for a single Choice
public class ChoiceVM : INotifyPropertyChanged
{
public ChoicesEnum Choice { get; private set; }
public ChoiceVM(ChoicesEnum choice)
{
this.Choice = choice;
}
private bool isChecked;
public bool IsChecked
{
get { return this.isChecked; }
set
{
this.isChecked = value;
this.OnPropertyChanged("IsChecked");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
#endregion
}
//Sample ViewModel containing a list of choices
//and exposes a property showing the currently selected choice
public class ViewModel : INotifyPropertyChanged
{
public List<ChoiceVM> Choices { get; private set; }
public ViewModel()
{
this.Choices = new List<ChoiceVM>();
//wrap each choice in a ChoiceVM and add it to the list.
foreach (var choice in Enum.GetValues(typeof(ChoicesEnum)))
this.Choices.Add(new ChoiceVM((ChoicesEnum)choice));
}
public ChoiceVM SelectedChoiceVM
{
get
{
ChoiceVM selectedChoice = this.Choices.FirstOrDefault((c) => c.IsChecked == true);
return selectedChoice;
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
#endregion
}
}
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