CODEWITHSUNDEEP
.netwinformstextboxcontextmenu
Martin Brown
Martin Brown

Reputation: 25310

How do you stop a textbox showing the default context menu?

I've noticed something wierd with the WinForm TextBox's Context Menu. The TextBox control has a default context menu that has Cut, Copy, Paste and a few other things. I am trying to replace this menu with one of my own. I have created a simple test application with one form and one text box on the form and added the following code:

Form1()
{
    InitailizeComponent();
    ContextMenu menu = new ContextMenu();
    menu.MenuItems.Add("Hello World", HelloWorld_Clicked);
    textBox1.ContextMenu = menu;
}

private void HelloWorld_Clicked(object sender, EventArgs e)
{
    MessageBox.Show("Hello World!");
}

When I run this I can get my context menu to appear by right clicking the textbox and then releasing the mouse button without moving the mouse. However if I press the right mouse button over the textbox, hold it down, then move the mouse outside the textbox and finally relase the mouse button then I get the default text box context menu.

Is it possible to stop it doing this?

UPDATE: In case it makes a difference the system is running on Windows XP Pro SP3 & .Net 3.5.

UPDATE 2: I tried this again in .Net Core 6 on Windows 11 with the following code and got the same issue.

namespace WinFormsApp1;

public partial class Form1 : Form
{
    public Form1()
    {
        this.InitializeComponent();
        ContextMenuStrip menu = new ContextMenuStrip();
        menu.Items.Add("Hello World", null, HelloWorld_Clicked);
        textBox1.ContextMenuStrip = menu;
    }

    private void HelloWorld_Clicked(object? sender, EventArgs e)
    {
        MessageBox.Show("Hello World!");
    }
}

Given MS have now started using GitHub I have raised an issue there.

Upvotes: 3

Views: 957

Answers (3)

Chris Raisin
Chris Raisin

Reputation: 442

If it helps, I found this answer in another part of the Internet:

[C#] textBox1.ContextMenu = new ContextMenu();

[VB.Net] textBox1.ContextMenu = New ContextMenu()

Upvotes: 0

LarsTech
LarsTech

Reputation: 81610

One thing you can try:

[DllImport("user32.dll")]
public static extern bool ReleaseCapture();

void textBox1_MouseDown(object sender, MouseEventArgs e) {
  if (e.Button == MouseButtons.Right) {
    ReleaseCapture();
  }
}

Upvotes: 1

Don Kirkby
Don Kirkby

Reputation: 56620

I suspect that releasing the mouse button outside the text box opens a context menu for the form instead of the text box. I haven't tested this, it's just a guess. You might be able set a context menu for the form as well with code like this, but I haven't tried it myself:

Form1()
{
    InitilizeComponent();
    ContextMenu menu = new ContextMenu();
    menu.MenuItems.Add("Hello World", HelloWorld_Clicked);
    textBox1.ContextMenu = menu;
    this.ContextMenu = menu;
}

private void HelloWorld_Clicked(object sender, EventArgs e)
{
    MessageBox.Show("Hello World!");
}

Upvotes: 1

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