CODEWITHSUNDEEP
c#winforms
Ayush
Ayush

Reputation: 42440

How can I suppress a method from getting triggered?

I am writing a windows forms application that has a check box regarding the application being added to start up (via registry). If the user checks the box, the CheckedChanged event handler triggers a method that attempts to add the application to the registry. If, for any reason, this fails, I want to revert the check box to its unchecked state, however doing so triggers the method again recursively. How can I avoid this?

Similarly, when the application first loads, I look at the registry and accordingly set the initial state of the checkbox. When I programmatically set the state of the checkbox, the even handler fires, which I do not want.

Is there any way I can suppress the even handler from triggering the CheckedChanged method?

Upvotes: 2

Views: 122

Answers (3)

Rex M
Rex M

Reputation: 144112

A simple way would be to disconnect the handler and reconnect it:

void CheckCbxProgrammatically(bool check)
{
    myCbx.CheckedChanged -= HandleCheckedChanged;
    myCbx.Checked = check;
    myCbx.CheckedChanged += HandleCheckedChanged;
}

You don't want to juggle state when you can avoid it.

Upvotes: 4

Paulo Santos
Paulo Santos

Reputation: 11567

A simple flag would suffice.

bool flag;

void ClickEventHandler(Object server, EventArgs e)
{
   if (flag) return;
   ....
}

And set the flag accordingly.

Upvotes: 2

Pabuc
Pabuc

Reputation: 5638

For this kind of cases, I declare a global bool isCalledManually and set it to true when I don't want it to trigger the event. In the event:

If(isCalledManually)
    isCalledManually = false;
Else
    // do your operations.

Upvotes: 2

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