How to make a user survey when closing a form, only if he changed something on it?

    2 answers 2

    To a form class or somewhere in an accessible place:

    public bool UpdateInForm = false;

    In handlers:

     private void textBox1_TextChanged(object sender, EventArgs e) { UpdateInForm = true; }

    And on the form closing handler:

     private void Form1_FormClosing(object sender, FormClosingEventArgs e) { if (UpdateInForm) { DialogResult result = MessageBox.Show("Сохранить изменения?", "Внимание", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question); if (result == System.Windows.Forms.DialogResult.Yes) { // Сохраняем } else if (result == System.Windows.Forms.DialogResult.No) { //Не сохраняем } else e.Cancel = true;//Отменяем действие } }
    • And how does it check for changes? - zerpico
    • We add change events to textboxes and other controls: private void textBox1_TextChanged (object sender, EventArgs e) {UpdateInForm = true; } or private void checkBox1_CheckedChanged (object sender, EventArgs e) {UpdateInForm = true; } - GenkaOk
    • This is of course all wonderful, but what if I have a lot of controls on the form - s017.radikal.ru/i429/1308/27/23df36367ab0.png I will get tired of broadcasting an event for each. Is there a more radical method? - zerpico
    • 3
      Something like this .. private void Form1_Load (object sender, EventArgs e) {foreach (Control a in this.Controls) {a.TextChanged + = a_TextChanged; ((CheckBox) a) .CheckedChanged + = Form1_CheckedChanged; }} void Form1_CheckedChanged (object sender, EventArgs e) {UpdateInForm = true; } void a_TextChanged (object sender, EventArgs e) {UpdateInForm = true; } - Wooden solution, you need to modify. - GenkaOk

    use Form.DialogResult

     Form form = new Form(); if (form.ShowDialog() == System.Windows.Forms.DialogResult.OK) { //действия } else { //действия }
    • Yes, not so. How do I know if something has changed on the form or not. And only if something was introduced or changed only then to interrogate - zerpico