How to in C# winforms when click a item in listbox created by user to open a automatically created form?

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Hi everyone. How to in C# WinForms when click a item in ListBox created by user to open a automatically created form?

When user click a item in ListBox, with is created by user (that item), to open a form with is a automatically created (i'am missing to in that form is to have a secound ListBox). In all different item in ListBox, to have a different Form with secound ListBox.
Can help please?

What I have tried:

Tryes some things likely:

void OnMouseDoubleClick(object sender, MouseEventArgs e)
{
    var list = (ListBox)sender;

    int itemIndex = list.IndexFromPoint(e.Location);
    if (itemIndex != -1)
    {
        object item = list.Items[itemIndex];
    }
}

Posted 6-Jan-22 4:38am

User 15226833

Updated 6-Jan-22 5:27am

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[no name] 6-Jan-22 10:39am

Sorry for my spell incorrect.

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

BillWoodruff · Answer 1 · 2022-01-06T05:27:00

Solution 1

Try this:

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    int ndx = (sender as ListBox).SelectedIndex;

    // check for no selection
    if (ndx == -1) return;

    switch (ndx)
    {
        case 0:
            // create whatever
            // show whatever
            break;
    }
}

Posted 6-Jan-22 5:27am

BillWoodruff

Updated 6-Jan-22 5:33am

v2

Comments

[no name] 7-Jan-22 7:43am

Yes, but wheno go onto next item in listbox, is doesn't works my script

[no name] 7-Jan-22 7:50am

Otherwise, this is my code:
int ndx = (sender as ListBox).SelectedIndex;
if (ndx == -1) return;

switch (ndx)
{
case 0:
ListBox devicesList = new ListBox();
this.newListBox = devicesList;
devicesList.Location = new Point(200, 78);
devicesList.BorderStyle = BorderStyle.Fixed3D;
//devicesList.Dock = DockStyle.Fill;
devicesList.Size = new Size(600, 372);
this.Controls.Add(devicesList);
break;
}

BillWoodruff 7-Jan-22 8:37am

1) ListBox Items are Type Object: when you assign them at design-time they will be Strings.

2) assigning other Types will work if their Type implements 'ToString.

3) your code:

a) every time you create a new "something" inside a method (locally), the reference to that something is lost when the method exits (goes out of scope). That is almost always a bad thing. Define variables of Type something outside the method, andassign new whatevers tp them inside the method: that way you don't lose the reference.

b) I can't tell what you are trying to do with this code: revise your original post, and clearly explain it.

How to in C# winforms when click a item in listbox created by user to open a automatically created form?

1 solution

Solution 1

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How to in C# winforms when click a item in listbox created by user to open a automatically created form?

1 solution

Solution 1

Add your solution here

Preview 0

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