Hi NG,
in a dynamically created tabpage I have a checkbox, which with its "Checked"
is bound (DataBindings.Add) to a bool property of one of my classes.
I realized, that the bool property of my class only gets updated if the
checkbox looses the focus.
Is there a way to forward the "Checked" to my class in the moment the user
clicks on the cbox, with out going the detour of the click-Event?
Thanks for help and hints.
Regards
Rainer 4 12215
In 2.0, Implement INotifyPropertyChanged (correctly); the following seems to
work where-ever the focus (i.e. put the focus where you want and wait 2.5
seconds...):
using System;
using System.Windows.Forms;
using System.ComponentModel;
using System.Diagnostics;
using System;
using System.Windows.Forms;
using System.ComponentModel;
using System.Diagnostics;
static class Program {
static void Main() {
SomeObject obj = new SomeObject();
obj.PropertyChanged += delegate(object sender,
PropertyChangedEventArgs args) {
// when anything changed, show new value via reflection
Debug.WriteLine(sender.GetType().GetProperty(args. PropertyName).GetValue(sender,null),
args.PropertyName);
};
using (Form f = new Form())
using (Timer timer = new Timer())
{
f.Text = "Binding demo";
// add a data-bound checkbox with the value
CheckBox chk = new CheckBox();
chk.Dock = DockStyle.Top;
chk.Text = "SomeBool";
f.Controls.Add(chk);
chk.DataBindings.Add("Checked", obj, "SomeBool");
// add a button to set the value
Button btn = new Button();
btn.Text = "Set";
btn.Click += delegate { obj.SomeBool = true; };
btn.Dock = DockStyle.Top;
f.Controls.Add(btn);
// add a button to clear the value
btn = new Button();
btn.Text = "Clear";
btn.Click += delegate { obj.SomeBool = false; };
btn.Dock = DockStyle.Top;
f.Controls.Add(btn);
// configure the timer to toggle the value regularly
timer.Interval = 2500;
timer.Tick += delegate { obj.SomeBool = !obj.SomeBool; };
timer.Start();
// show
f.ShowDialog();
}
}
class SomeObject : INotifyPropertyChanged {
protected void OnNotifyPropertyChanged(string propertyName) {
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) {
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
private bool _someBool;
public bool SomeBool {
get { return _someBool; }
set {
if (_someBool != value) {
_someBool = value;
OnNotifyPropertyChanged("SomeBool");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
Darnit - read the e-mail backwards!
I don't know why, but I read it as "update the checkbox as soon as the
object changes". You clearly meant the exact opposite.
In this case, just change the binding's DataSourceUpdateMode; with the
previous code, this would be an extension of the existing DataBindings.Add
line:
chk.DataBindings.Add("Checked", obj, "SomeBool").DataSourceUpdateMode =
DataSourceUpdateMode.OnPropertyChanged;
Marc
Hi Marc,
"Marc Gravell" <ma**********@gmail.com> schrieb im Newsbeitrag
news:uB**************@TK2MSFTNGP05.phx.gbl... Darnit - read the e-mail backwards!
I don't know why, but I read it as "update the checkbox as soon as the object changes". You clearly meant the exact opposite.
In this case, just change the binding's DataSourceUpdateMode; with the previous code, this would be an extension of the existing DataBindings.Add line:
chk.DataBindings.Add("Checked", obj, "SomeBool").DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged;
Works perfect. Thanks for the hint!
Rainer
Welcome... I just wish I hadn't done all that typing for the other
(irrelevant) answer! Well, maybe somebody will find it useful some day...
Marc This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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