How to pass value to unspecified object using delegate C#

Mr Celetron

I have a FlowLayoutPanel containing an unspecified number of Labels, when I double click in one of them, a new Form containing a TextBox and a Button will appear, here is the code:

foreach (Label lb in FlowLayoutPanel1.Controls)

{

lb.MouseDoubleClick+=new MouseEventHandler(lb_MouseDoubleClick);

}

private void lb_MouseDoubleClick(object sender, MouseEventArgs e)

{

NewForm form = new NewForm();

form.ShowDialog();

((Label)sender).Text = ...;//I want get text from TextBox of the NewForm here

}

I want get Text from TextBox of the NewForm and assign Text to the object that invoke the NewForm when user click the Button of the NewForm, I know to use properties or static variable to do this, but I dont know how to use delegate to do this? Please help me,Thanks!

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes14y ago
Roy's suggestion should work but not until NewForm is closed as the ShowDialog() method will prevent the following line from executing until that happens.

If you want it to show up as soon as the button is clicked, then I'd change the constructor on NewForm to accept a reference to the label which was double-clicked:

class NewForm: Form
{
private Label lbl;

public NewForm(Label lbl)
{
InitializeComponent();
this.lbl = lbl;
}

private button1_Click(object sender, EventArgs e)
{
lbl.Text = textBox1.Text;
}

// rest of code
}

In the other form you'll then need:

private void lb_MouseDoubleClick(object sender, MouseEventArgs e)
{
Label lbl = (Label)sender;
NewForm form = new NewForm(lbl);
form.ShowDialog();
}
Roy S14y ago
Add a public property to the second form with a get (a set isn't needed but can be added if necessary). And in the get you just have to return the text value of the textbox.

public string TextFromTextbox
{
get
{
return txtText.Text;
}
}

EDIT: Found a much better way.