.net 如何取消 RadioButton 或 CheckBox 选中的更改

How to cancel RadioButton or CheckBox checked change

提问by RvdK

Is there any way to cancel a RadioButton or CheckBox's change in state before it changes?

有没有办法在 RadioButton 或 CheckBox 更改之前取消它的状态更改？

I was hoping for a simple event like CheckedChanging or BeforeCheckedChange.

我希望有一个像 CheckedChanging 或 BeforeCheckedChange 这样的简单事件。

I really want to avoid listening for mouse clicks and key presses. But if you know of a proven reliable way of using mouse clicks and key presses, please explain it.

我真的想避免监听鼠标点击和按键。但是，如果您知道使用鼠标点击和按键的可靠方法，请解释一下。

I'm using .NET 2.0 with standard Winforms controls.

我将 .NET 2.0 与标准 Winforms 控件一起使用。

回答by RvdK

Set AutoCheck to false.

将自动检查设置为 false。

Override OnClick to manual check the checkbox

覆盖 OnClick 以手动检查复选框

回答by Corey Trager

Code demo's AutoCheck, adds a confirmation prompt to Click event.

代码演示的 AutoCheck，为 Click 事件添加了确认提示。

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.checkBox1.AutoCheck = false;
        this.checkBox1.Click += new System.EventHandler(this.checkBox1_Click);
    }

    private void checkBox1_Click(object sender, EventArgs e)
    {
        CheckBox checkBox = (CheckBox)sender;
        if (!checkBox.Checked)
        {
            DialogResult dialogResult = MessageBox.Show(
                "Are you sure?", "my caption",
                 MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                checkBox.Checked = true;
            }
        }
        else
        {
            checkBox.Checked = false;
        }
    }
}

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.checkBox1.AutoCheck = false;
        this.checkBox1.Click += new System.EventHandler(this.checkBox1_Click);
    }

    private void checkBox1_Click(object sender, EventArgs e)
    {
        CheckBox checkBox = (CheckBox)sender;
        if (!checkBox.Checked)
        {
            DialogResult dialogResult = MessageBox.Show(
                "Are you sure?", "my caption",
                 MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                checkBox.Checked = true;
            }
        }
        else
        {
            checkBox.Checked = false;
        }
    }
}

回答by Jon649

I used this to cancel a radio button check.

我用它来取消单选按钮检查。

 private void radioButton1_MouseClick(object sender, MouseEventArgs e)
    {
        RadioButton r = (RadioButton)sender;
        r.Checked = !(r.Checked);
    }