Hello I was wondering how can I keep an eye on all textboxes
in Form whether in any of them was changed value. I saw some code here
private void Form1_Load(object sender, EventArgs e)
{
foreach (Control ctrl in this.Controls)
{
if (ctrl is TextBox)
{
TextBox tb = (TextBox)ctrl;
tb.TextChanged += new EventHandler(tb_TextChanged);
}
}
}
void tb_TextChanged(object sender, EventArgs e)
{
TextBox tb = (TextBox)sender;
tb.Tag = "CHANGED"; // or whatever
}
And a guy who wrote this code says that "it can't be assigned to textboxes in Panels and Grouboxes".
So my question is as I have almost every textbox in groubox or panel, how can I see whether change was made for textboxes in panels or groupbox?
You can make your method recursive:
private void Form1_Load(object sender, EventArgs e)
{
Assign(this);
}
void Assign(Control control)
{
foreach (Control ctrl in control.Controls)
{
if (ctrl is TextBox)
{
TextBox tb = (TextBox)ctrl;
tb.TextChanged += new EventHandler(tb_TextChanged);
}
else
{
Assign(ctrl);
}
}
}
void tb_TextChanged(object sender, EventArgs e)
{
TextBox tb = (TextBox)sender;
tb.Tag = "CHANGED"; // or whatever
}
Just find a better name for the method instead of Assign
.
When you have to deal with nested controls, 1 for loop can't help. You have to use some recursive method or custom stack
to loop through all the controls, something like this:
private void RegisterTextChangedEventHandler(Control root){
Stack<Control> stack = new Stack<Control>();
stack.Push(root);
Control current = null;
while(stack.Count>0){
current = stack.Pop();
foreach(var c in current.Controls){
if(c is TextBox) ((TextBox)c).TextChanged += textChanged;
stack.Push(c);
}
}
}
private void textChanged(object sender, EventArgs e){
//....
}
//Use it
RegisterTextChangedEventHandler(yourForm);//Or your container ....
You need another loop for the groupbox
and panels
, you can use this code:
private void addEvents(Control.ControlCollection ct)
{
foreach (Control ctrl in ct)
{
if (ctrl is TextBox)
{
TextBox tb = (TextBox)ctrl;
tb.TextChanged += new EventHandler(tb_TextChanged);
}
else if (ctrl is GroupBox || ctrl is Panel) addEvents(ctrl.Controls);
}
}
private void Form1_Load(object sender, EventArgs e)
{
addEvents(this.Controls);
}
void tb_TextChanged(object sender, EventArgs e)
{
TextBox tb = (TextBox)sender;
tb.Tag = "CHANGED"; // or whatever
}