how to overide the base class event in the child class

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Hi i have an event deleclared for text box not to allow any special characters,if we place any textbox in the child forms.but there is one case where I have not to check for the base class event .how can i overide the base class event in the child class so that the form should not take the base class event for the specified text box

following is the sample code
in base form i have

public static void SetCustomDisabled{
textbox.ParseEditValue += new ConvertEditValueEventHandler(ParseEditValue)
}

Private void memo_ParseEditValue(object sender,
.ConvertEditValueEventArgs e)
{
e.Value = false;

}

Thanks in advance

Posted 5-Aug-13 3:45am

lakshmichawala

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Maarten Kools 5-Aug-13 9:53am

Just make the ParseEditValue method virtual and override it in your derived class. Is that what you mean?

2 solutions

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Basmeh Awad · Answer 1 · 2013-08-05T04:04:00

Solution 1

try this

C#

Private void memo_ParseEditValue(object sender, 
.ConvertEditValueEventArgs e)
{
if (sender.ToString().Contains("textbox1"))//your control name which you dont want to handle
            {

            }
            else
            {
                e.Value = false;            
            }
 

}

Posted 5-Aug-13 4:04am

Basmeh Awad

Comments

lakshmichawala 5-Aug-13 10:13am

hi Basmeh Awad i want to overide the event in the child class how can i write overide method so that it should not take the base class event

idenizeni · Answer 2 · 2013-08-05T07:09:00

Just attach the event you want to do the work, I am confused by the override comment as you are not overriding anything, you are attaching an event. Just attach a different method to handle the event for the 'special' text box.

Create an additional method, along with your original, to handle the special text box's event, like so...

C#

Private void memo_ParseEditValue(object sender,ConvertEditValueEventArgs e)
{
    // do something to original text box
    e.Value = false;
}

Private void memo_SpecialParseEditValue(object sender,ConvertEditValueEventArgs e)
{
    // do something different for the special text box
}

Then attach the new method to handle the special text box, like so...

C#

public static void SetCustomDisabled
{
    // attach to original text box
    textbox.ParseEditValue += new ConvertEditValueEventHandler(memo_ParseEditValue)

    // attach different method to the special text box
    textboxSpecial.ParseEditValue += new SpecialConvertEditValueEventHandler(memo_SpecialParseEditValue)
}