c# - datatemplate wpf c# 中的单选按钮

Question

我正在尝试访问数据网格中数据模板内的单选按钮。我遇到了很多答案，但没有一个对我有用。我在 3 个不同的列中有 3 个不同的单选按钮。我只是想不出如何访问这些单选按钮，这让我很难受，我已经为此苦苦挣扎了好几天，请帮助。

<DataGridTemplateColumn Header="Yes" Width="Auto">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <StackPanel Opacity="0.8">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <RadioButton x:Name="rbYes" GroupName="{Binding QuestionID}" Content="Yes" Grid.Column="0" />
                </Grid>
            </StackPanel>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="No" Width="Auto">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <StackPanel Opacity="0.8">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <RadioButton x:Name="rbNo" GroupName="{Binding QuestionID}" Content="No" Grid.Column="0" />
                </Grid>
            </StackPanel>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="N/A" Width="Auto">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <StackPanel Opacity="0.8">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <RadioButton x:Name="rbNA" GroupName="{Binding QuestionID}" Content="N/A" Grid.Column="0" />
                </Grid>
            </StackPanel>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

这是我的代码。我已经改了很多次了。

RadioButton rbYes = (RadioButton)FindName("rbYes");
RadioButton rbNo = (RadioButton)FindName("rbNo");
RadioButton rbNA = (RadioButton)FindName("rbNA");

if (rbYes.IsChecked == true)
{
    rbNo.IsChecked = false;
    rbNA.IsChecked = false;
    int questionID = Convert.ToInt32(drv["QuestionID"]);
    questionAnswer = "Yes".ToString();
    if (drv["Notes"].ToString() == "")
    {
        string notes = null;
    }
    else
    {
        string notes = drv["Notes"].ToString();
    }

Answer 1

假设您熟悉数据绑定(bind)(因为您已经绑定(bind)了 QuestionID)，我的建议如下；

1. 在数据网格中填充数据的对象中有 3 个 bool 属性，例如 IsYes、IsNo、IsNA。将绑定(bind)到数据网格的 ItemSource 的集合作为 ObservableCollection。
2. 将单选按钮的IsChecked分别绑定(bind)到这三个属性。

通过执行上述步骤，您不必担心深入数据网格的单元格以查找控件并了解它们是否已设置。

[更新] 抱歉耽搁了。我正在开会。代码如下。请注意，这是一个关于如何实现我上面提到的概念的非常粗略的模型。

MainWindow.xaml

<Window x:Class="testWPFApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:testWPFApplication"
        mc:Ignorable="d" DataContext="{Binding RelativeSource={RelativeSource Self}}"
        Title="MainWindow" Height="350" Width="525">
    <Grid x:Name="LayoutRoot" >
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="30" />
        </Grid.RowDefinitions>

        <DataGrid Grid.Row="0" SelectionMode="Single"
                  ItemsSource="{Binding Questions}" SelectedItem="{Binding SelectedQuestion,Mode=TwoWay}" AutoGenerateColumns="False"
                  CanUserAddRows="False" CanUserDeleteRows="False">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Question Id" Binding="{Binding QuestionId}" IsReadOnly="True" />
                <DataGridTextColumn Header="Question" Binding="{Binding QuestionDescription}" Width="3*" IsReadOnly="True" />
                <DataGridTemplateColumn Header="Yes">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <RadioButton GroupName="{Binding QuestionId}" IsChecked="{Binding IsYes, Mode=TwoWay,UpdateSourceTrigger=LostFocus,NotifyOnTargetUpdated=True}" 
                                         HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="No">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <RadioButton GroupName="{Binding QuestionId}" IsChecked="{Binding IsNo, Mode=TwoWay,UpdateSourceTrigger=LostFocus,NotifyOnTargetUpdated=True}" 
                                         HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="N/A">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <RadioButton GroupName="{Binding QuestionId}" IsChecked="{Binding IsNA, Mode=TwoWay,UpdateSourceTrigger=LostFocus,NotifyOnTargetUpdated=True}" 
                                         HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>

        <Button Grid.Row="1" Width="100" x:Name="btnCheckAnswers" HorizontalAlignment="Right" Margin="5" Click="btnCheckAnswers_Click" Content="Check Answers" />
    </Grid>
</Window>

MainWindow.xaml.cs(代码隐藏。可以移动到不同的 ViewModel 类)

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;

namespace testWPFApplication
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private ObservableCollection<Question> _questions;
        private Question _selectedQuestion;

        public ObservableCollection<Question> Questions
        {
            get { return _questions; }
            set
            {
                _questions = value;
                OnPropertyChanged("Questions");
            }
        }

        public Question SelectedQuestion
        {
            get { return _selectedQuestion; }
            set
            {
                _selectedQuestion = value;
                OnPropertyChanged("SelectedQuestion");
                OnSelectedQuestionChanged();
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public void OnPropertyChanged(string strPropertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(strPropertyName));
            }
        }

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            Init();

        }

        private void Init()
        {
            CreateMockData();
        }

        private void CreateMockData()
        {
            if (Questions == null)
            {
                Questions = new ObservableCollection<Question>();
            }
            else
            {
                Questions.Clear();
            }

            for (int i = 1; i <= 5; i++)
            {
                Question q = new Question
                {
                    QuestionId = i,
                    QuestionDescription = "Sample Question " + i.ToString(),
                    IsYes = false,
                    IsNA = false,
                    IsNo = false
                };
                Questions.Add(q);
            }
        }

        private void OnSelectedQuestionChanged()
        {
            if(SelectedQuestion != null)
            {

            }
        }

        private void btnCheckAnswers_Click(object sender, RoutedEventArgs e)
        {
            StringBuilder strQuestionAnswer = new StringBuilder();
            foreach (Question item in Questions)
            {
                strQuestionAnswer.AppendLine(item.QuestionDescription + ":");
                strQuestionAnswer.AppendLine("IsYes:" + item.IsYes);
                strQuestionAnswer.AppendLine("IsNo:" + item.IsNo);
                strQuestionAnswer.AppendLine("IsNA:" + item.IsNA);
            }

            MessageBox.Show(strQuestionAnswer.ToString());
        }
    }

    public class Question
    {
        public int QuestionId { get; set; }

        public string QuestionDescription { get; set; }

        public bool IsYes { get; set; }

        public bool IsNo { get; set; }

        public bool IsNA { get; set; }
    }
}

窗口负载

设置的值很少

点击按钮时的结果

希望这个例子能帮助您解决您遇到的问题。