Hide / show form OnVisibleChanged

Question

I have overridden the OnVisibleChanged method:

 protected override void OnVisibleChanged(EventArgs e) { base.OnVisibleChanged(e); this.Visible = false; }

that is, when the program is loaded, the form is immediately hidden.

How can I then call the same method, but only vice versa, so that the form shows?

I tried this:

 this.Show(); this.Visible = true;

All is in vain, well, it is understandable, because OnVisibleChanged is OnVisibleChanged , and its OnVisibleChanged is false .

Hide / show form does not suit me to hide / show.

Accepted Answer · 2016-10-04T08:54:50

Changing the visibility in the form-responsive function is not correct. You need to transfer your code from OnVisibleChanged to something else, for example, to OnLoad . And the @altexoander code is used in any function (except OnVisibleChanged ).

 private void Form_Load(object sender, EventArgs e) { ... // Что то еще. this.Visible = false; } public void ChangeVisible() { this.Visible = this.Visible ? false : true; }

I did everything as you wrote, at startup - the form is NOT hidden, and then (after a second) an error flies (not to your lines, but to "an object link does not indicate an object instance.")
In the form that we will hide we are looking for, in the properties, the Load event and double click on it.
Go to the form code, to a specific event handler and 'this.Visible = false; to it 'this.Visible = false; this 'this.Visible = false;
We delete all the art from OnVisibleChanged , we don’t touch the handler itself (we get an empty function).
In the form class, we add the PUBLIC function ChangeVisible .
Now we can from another form, run this form in a hidden form, and manage its visibility (do not forget to only subscribe to Form.Deactivate)

Answer 2 · 2016-10-04T08:14:00

Check the visibility of the form and just change the code. For example, you have now

this.Visible = false

Who bothers you to check and deliver this?

 protected override void OnVisibleChanged(EventArgs e) { base.OnVisibleChanged(e); this.Visible = this.Visible ? false : true; }

Those. for each VisibleChanged call, you will simply ignore external calls and alternately change the visibility from true to false (for example, 2 calls to the .Show form will appear and hide again).

Beauty is not enough, but this solution is "vlob."

@Maxim, unfortunately, even this will not work, since the function will loop, changing the form visibility, we call OnVisibleChanged .
@ Maxim, and how are you trying to change the visibility of the form?
When using, if I'm not mistaken, the ternary operator in OnVisibleChanged, an error pops up when the application starts: An unhandled exception of the type "System.StackOverflowException" in System.Windows.Forms.dll

Hide / show form OnVisibleChanged

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