CODEWITHSUNDEEP
.netwinformsevents
user93202
user93202

Reputation:

How to cancel RadioButton or CheckBox checked change

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

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

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.

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

Upvotes: 32

Views: 31134

Answers (4)

titol
titol

Reputation: 1149

private void cbSuspended_CheckedChanged(object sender, EventArgs e)
{
    var result = MessageBox.Show("Are you sure?", "Change status", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
    if (result != DialogResult.Yes)
    {
        cbSuspended.CheckedChanged -= cbSuspended_CheckedChanged;
        cbSuspended.Checked = !cbRemoved.Checked;
        cbSuspended.CheckedChanged += cbSuspended_CheckedChanged;
        return;
    }
}

Upvotes: 0

Jon649
Jon649

Reputation: 289

I used this to cancel a radio button check.

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

Upvotes: 1

Corey Trager
Corey Trager

Reputation: 23123

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

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;
        }
    }
}

Upvotes: 21

RvdK
RvdK

Reputation: 19790

Set AutoCheck to false.

Override OnClick to manual check the checkbox

Upvotes: 48

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