how to add event handler to programatically created checkboxes

» chash » how to add event handler to programatically created checkboxes

By : mcalzetta

Date : November 26 2020, 01:01 AM

help you fix your problem C# is case-sensitive. Your function is named CheckBox_CheckedChanged, but you are attempting to attach an event handler for a function named checkBox_CheckedChanged (note the upper- vs. lowercase "c" at the beginning).

code :

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Event Handler is not getting called for dynamically created checkboxes

By : Elizabeth Green

Date : March 29 2020, 07:55 AM

around this issue Add your checkboxes dynamically and set a unique name for each checkbox. Checkboxes are only posted back to the server if the checkbox is checked, so you can test to see if it is checked by checking Request.Form to see if the name exists. For example, lets say you named your check boxes chk_[0-9] (i.e. chk_0, chk_1 etc till 9), you could check if they ticked by doing:

code :

for(int i=0; i < 10; i++)
{
    string chk_name = "chk_" + i.ToString();
    if (Request.Form[chk_name] != null)
    {
        //checkbox is checked
    }
    else
    {
        //checkbox is not checked
    }
}

Event handler function isn't firing up for created dynamically checkboxes

By : Jesse Phillips

Date : March 29 2020, 07:55 AM

wish of those help Try;
making the event handler public & non-static, make sure nobody is eating up the events.

code :

chk[i].AddHandler(PointerPressedEvent, 
    new PointerEventHandler(SomeButton_PointerPressed), true);

Global event handler has no detail if the object that threw the exeception was created in an event handler

By : Sue Murphy

Date : March 29 2020, 07:55 AM

wish helps you The stack trace was there I was just not looking in the right place
Depending if the object was created in a handler or not effects if the valuable stack trace is in the outer or inner exception

code :

public partial class App : Application
{
    void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
    {
        System.Diagnostics.Debug.WriteLine((e == null).ToString());
        System.Diagnostics.Debug.WriteLine("e.ToString() " + e.ToString());
        System.Diagnostics.Debug.WriteLine("e.Exception.GetBaseException().Message " + e.Exception.GetBaseException().Message);
        System.Diagnostics.Debug.WriteLine("e.Exception.GetBaseException().InnerException " + e.Exception.GetBaseException().InnerException);
        System.Diagnostics.Debug.WriteLine("e.Exception.GetBaseException().Source " + e.Exception.GetBaseException().Source.ToString());
        System.Diagnostics.Debug.WriteLine("e.Exception.StackTrace " + e.Exception.StackTrace.ToString());
        System.Diagnostics.Debug.WriteLine("e.Exception.GetBaseException().StackTrace " + e.Exception.GetBaseException().StackTrace.ToString());
        StringBuilder sb = new StringBuilder();
        if (e.Exception.InnerException != null)
        {
            sb.AppendLine("InnerException");
            sb.AppendLine(e.Exception.InnerException.Message);
            if (!string.IsNullOrEmpty(e.Exception.InnerException.StackTrace))
            {
                int count = 0;
                foreach (string line in e.Exception.InnerException.StackTrace.Split('\n'))
                {
                    sb.AppendLine(line.Trim());
                    count++;
                    if (count > 3) break;
                }
            }
        }
        sb.AppendLine("OuterException");
        sb.AppendLine(e.Exception.Message);
        if (!string.IsNullOrEmpty(e.Exception.StackTrace))
        {              
            int count = 0;
            foreach (string line in e.Exception.StackTrace.Split('\n'))
            {
                sb.AppendLine(line.Trim());
                count++;
                if (count > 3) break;
            }
        }
        MessageBox.Show(sb.ToString(), "App_DispatcherUnhandledException");
        e.Handled = true;
        if (MainWindow != null) MainWindow.Close();
    }
    public App()
    {
        this.DispatcherUnhandledException += new DispatcherUnhandledExceptionEventHandler(App_DispatcherUnhandledException);
    }
}

Wiring all dynamically-created checkboxes to the same event handler

By : mousmi kumari

Date : March 29 2020, 07:55 AM

fixed the issue. Will look into that further I'm trying to dynamically created checkboxes on a panel based on user-entered data. If any of these are checked, I'd like to UNCHECK a different checkbox, outside of the panel. Looks something like this: , Try using a variable instead:

code :

bool somethingChecked = false;
foreach (CheckBox cb in pnlCamTicky.Controls.OfType<CheckBox>()) {
  if (cb.Checked) {
    somethingChecked = true;
  }
}
chkAllCameras.Checked = somethingChecked;