Why is FALSE always returned--when I focus an item?

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After loading the screen fields with the appropriate values, I focus on the first field on the screen.

However, the focus winds up on one of my buttons. (Even though, I never tell the program to do so.)

During debugging, I noticed the return value of my field.Focus() statement--is FALSE.

This means, either: 1. The program is NOT going to focus on the field that I specified (which it doesn't); 2. The program can NOT focus on the field that I specified--for some reason. Unfortunately, since the program doesn't bomb--there's really no way for me to tell.

Is there an ALTERNATIVE WAY to focus a field--and actually have the field FOCUSED?

What I have tried:

Using FOCUS() for the field.
(I also use SELECT()--and although this works, it doesn't actually FOCUS on the field, the way that I'd like.)

Posted 21-Jun-22 7:55am

robertd903

Updated 21-Jun-22 9:45am

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0x01AA 21-Jun-22 14:13pm

Is this Windows Forms?

3 solutions

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OriginalGriff · Answer 1 · 2022-06-21T08:26:00

Have you tried setting the Tab Order?
Set tab order of controls - Windows Forms .NET | Microsoft Docs[^]
If the tab order isn't changed, then the first input control you added to your form will get the focus set to it when the form loads.

Also check that the control you are calling Focus on is definitely the button, and that you are calling it in the Shown event rather than the Load or Form constructor.

0x01AA · Answer 2 · 2022-06-21T08:38:00

Just made a test with Windows Forms...

Does _not_ set focus on the button of my choice:

private void FormMain_Load(object sender, EventArgs e)
{
    // No sucess
    buttonTestHttpClient.Focus();
}

This works and sets the focus on the button of my choice:

private void FormMain_Load(object sender, EventArgs e)
{
    // Sucess, also with e.g. a Textbox.
    this.ActiveControl = buttonTestHttpClient;
}

[Edit] Works also for me

private void FormMain_Load(object sender, EventArgs e)
{
    // Sucess, also with e.g. a Textbox.
    buttonTestHttpClient.Select();
}

[Edit 1]
See also here, especally the 'Note': Control.Focus Method (System.Windows.Forms) | Microsoft Docs[^]

Note

Focus is a low-level method intended primarily for custom control authors. Instead, application programmers should use the Select method or the ActiveControl property for child controls, or the Activate method for forms.

I hope it helps.

RickZeeland · Answer 3 · 2022-06-21T09:45:00

Solution 3

You might have set a button as the default button in the designer.
See: Designate a Button as the Accept Button Using the Designer - Windows Forms .NET Framework | Microsoft Docs[^]

Posted 21-Jun-22 9:45am

RickZeeland

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0x01AA 21-Jun-22 16:02pm

But that works only for Buttons and what I understand from the question, it is more 'InputControl' related...?

RickZeeland 22-Jun-22 2:19am

He mentions: "However, the focus winds up on one of my buttons"

Why is FALSE always returned--when I focus an item?

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