clearing a textbox which is in a function-CodePudding

i have a function that create a textbox (info box) and can be called from other functions or from buttons.

function InfoBox ($x,$y,$text){
    $TextboxInfoBox = New-Object System.Windows.Forms.TextBox
    $TextboxInfoBox.Location = New-Object System.Drawing.Size($x,$y)
    $TextboxInfoBox.Size = New-Object System.Drawing.Size(200,800)
#   Readonly Textbox.
    $TextboxInfoBox.Enabled = $true
    $TextboxInfoBox.Text = $text
    $TabPanelButtons.Controls.Add($TextboxInfoBox)
}

After i called the textbox once, i am not able to overwrite it with another info message. the first time i call with all the parameters ($x, $y & $text).

Infobox -x '100' -y '150' -text 'This is the first message'

The second time i only want to give another text. How can i clear the textbox and give only a new text like:

Infobox -text "This is the second message"

Any Ideas?

CodePudding user response：

As commenter wrote, the function has to output the TextBox object so you can reference it later to change the text:

function InfoBox ($x,$y,$text){
    $TextboxInfoBox = New-Object System.Windows.Forms.TextBox
    $TextboxInfoBox.Location = New-Object System.Drawing.Size($x,$y)
    $TextboxInfoBox.Size = New-Object System.Drawing.Size(200,800)
#   Readonly Textbox.
    $TextboxInfoBox.Enabled = $true
    $TextboxInfoBox.Text = $text
    $TabPanelButtons.Controls.Add($TextboxInfoBox)

    $TextboxInfoBox  # Output
}

Contrary to most other programming languages, in PowerShell you normally don't need to use the return statement, except for early return from a function. Simply referring to a variable by name on its own line will output its value from the function.

Now you can store the output in a variable and change the text:

$box = Infobox -x 100 -y 150 -text 'This is the first message'

$box.Text = 'This is the second message'