How do I make an Event in the Usercontrol and have it handled in the Main Form?
C#WinformsUser ControlsEvent HandlingC# Problem Overview
I have a custom usercontrol and I want to do something relatively simple.
When ever a numeric up down in that usercontrol's value changes, have the main form update a display window.
This is not a problem if the NUD was not in a usercontrol but I can't seem to figure out how to have the event handled by the mainform and not the usercontrol.
C# Solutions
Solution 1 - C#
You need to create an event handler for the user control that is raised when an event from within the user control is fired. This will allow you to bubble the event up the chain so you can handle the event from the form.
When clicking Button1
on the UserControl, i'll fire Button1_Click
which triggers UserControl_ButtonClick
on the form:
User control:
[Browsable(true)] [Category("Action")]
[Description("Invoked when user clicks button")]
public event EventHandler ButtonClick;
protected void Button1_Click(object sender, EventArgs e)
{
//bubble the event up to the parent
if (this.ButtonClick!= null)
this.ButtonClick(this, e);
}
Form:
UserControl1.ButtonClick += new EventHandler(UserControl_ButtonClick);
protected void UserControl_ButtonClick(object sender, EventArgs e)
{
//handle the event
}
Notes:
-
Newer Visual Studio versions suggest that instead of
if (this.ButtonClick!= null) this.ButtonClick(this, e);
you can useButtonClick?.Invoke(this, e);
, which does essentially the same, but is shorter. -
The
Browsable
attribute makes the event visible in Visual Studio's designer (events view),Category
shows it in the "Action" category, andDescription
provides a description for it. You can omit these attributes completely, but making it available to the designer it is much more comfortable, since VS handles it for you.
Solution 2 - C#
Try mapping it. Try placing this code in your UserControl
:
public event EventHandler ValueChanged {
add { numericUpDown1.ValueChanged += value; }
remove { numericUpDown1.ValueChanged -= value; }
}
then your UserControl
will have the ValueChanged
event you normally see with the NumericUpDown
control.
Solution 3 - C#
you can do like this.....the below example shows text box(user control) value changed
// Declare a delegate
public delegate void ValueChangedEventHandler(object sender, ValueChangedEventArgs e);
public partial class SampleUserControl : TextBox
{
public SampleUserControl()
{
InitializeComponent();
}
// Declare an event
public event ValueChangedEventHandler ValueChanged;
protected virtual void OnValueChanged(ValueChangedEventArgs e)
{
if (ValueChanged != null)
ValueChanged(this,e);
}
private void SampleUserControl_TextChanged(object sender, EventArgs e)
{
TextBox tb = (TextBox)sender;
int value;
if (!int.TryParse(tb.Text, out value))
value = 0;
// Raise the event
OnValueChanged( new ValueChangedEventArgs(value));
}
}
Solution 4 - C#
one of the easy way to do that is use landa function without any problem like
userControl_Material1.simpleButton4.Click += (s, ee) =>
{
Save_mat(mat_global);
};
Solution 5 - C#
For those looking to do this in VB, here's how I got mine to work with a checkbox.
Background: I was trying to make my own checkbox that is a slider/switch control. I've only included the relevant code for this question.
###In User control MyCheckbox.ascx
<asp:CheckBox ID="checkbox" runat="server" AutoPostBack="true" />
###In User control MyCheckbox.ascx.vb
Create an EventHandler (OnCheckChanged). When an event fires on the control (ID="checkbox") inside your usercontrol (MyCheckBox.ascx), then fire your EventHandler (OnCheckChanged).
Public Event OnCheckChanged As EventHandler
Private Sub checkbox_CheckedChanged(sender As Object, e As EventArgs) Handles checkbox.CheckedChanged
RaiseEvent OnCheckChanged(Me, e)
End Sub
###In Page MyPage.aspx
<uc:MyCheckbox runat="server" ID="myCheck" OnCheckChanged="myCheck_CheckChanged" />
Note: myCheck_CheckChanged didn't fire until I added the Handles clause below
###In Page MyPage.aspx.vb
Protected Sub myCheck_CheckChanged (sender As Object, e As EventArgs) Handles scTransparentVoting.OnCheckChanged
'Do some page logic here
End Sub