如何拥有一个控制子复选框UWP c#的父复选框答案

【问题标题】：How to have a parent check box that controls child checkbox UWP c#如何拥有一个控制子复选框UWP c#的父复选框
【发布时间】：2020-04-29 13:49:50
【问题描述】：

我的 uwp 程序中有这个：

我想要这样：

如果选中父复选框，则所有子复选框也都选中。
如果父复选框未选中，则所有子复选框也未选中。
如果选中所有子复选框，则父复选框也会选中。
如果未选中任何子复选框，则不会选中父复选框。

我当前的代码可以处理前三个，但是当我取消选中其中一个子级时，父级的未选中操作被激活，这将取消选中所有子级。

复选框被限制为 bool 同名项目。

检查代码：

private void IsChecked(object sender, RoutedEventArgs e)
{
    CheckBox checkBox = sender as CheckBox;

    if (checkBox.Name == "chkWeekday")
    {
        Monday = true;
        Tuesday = true;
        Wednesday = true;
        Thursday = true;
        Friday = true;
    }
    else
    {
        switch (checkBox.Name) // Handles data not updating yet
        {
            case "chkMonday":
                Monday = true;
                break;
            case "chkTuesday":
                Tuesday = true;
                break;
            case "chkWednesday":
                Wednesday = true;
                break;
            case "chkThursday":
                Thursday = true;
                break;
            case "chkFriday":
                Friday = true;
                break;
        }
        if (Monday && Tuesday && Wednesday && Thursday && Friday)
        {
            Weekday = true;
        }
        break;
    }
}

取消检查代码：

private void IsUnchecked(object sender, RoutedEventArgs e)
{
    CheckBox checkBox = sender as CheckBox;

    if (checkBox.Name == "chkWeekday")
    {
        Monday = false;
        Tuesday = false;
        Wednesday = false;
        Thursday = false;
        Friday = false;
    }
    else
    {
        Weekday = false; //<============================================ This is why it un-checks all
        switch (checkBox.Name) // Handles data not updating yet
        {
            case "chkMonday":
                Monday = false;
                break;
            case "chkTuesday":
                Tuesday = false;
                break;
            case "chkWednesday":
                Wednesday = false;
                break;
            case "chkThursday":
                Thursday = false;
                break;
            case "chkFriday":
                Friday = false;
                break;
        }
        break;
    }
}

有没有办法更有效地/以有效的方式做到这一点。

【问题讨论】：

标签： c# checkbox uwp

【解决方案1】：

最好不要订阅Checked和Unchecked事件，设置IsChecked属性时，总是触发这两个事件，不方便判断。在这种情况下，您只需为 CheckBox 订阅 Click 事件。例如：

private void MyCheckBox_Click(object sender, RoutedEventArgs e)
{
    CheckBox checkBox = sender as CheckBox;

    if (checkBox.Name == "chkWeekday" && checkBox.IsChecked == true)// First demand
    {
        chkTuesday.IsChecked = chkWednesday.IsChecked = chkThursday.IsChecked = true;
    }
    else if (checkBox.Name == "chkWeekday" && checkBox.IsChecked == false) // Second demand
    {
        chkTuesday.IsChecked = chkWednesday.IsChecked = chkThursday.IsChecked = false;
    }
    else if (chkTuesday.IsChecked == true && chkWednesday.IsChecked == true && chkThursday.IsChecked == true) //Third demand
    {
        chkWeekday.IsChecked = true;
    }
    else //Fourth demand
    {
        chkWeekday.IsChecked = false;
    }
}

【讨论】：