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POLooping through controls in WPF / Powershell
 

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    <p>I am trying to loop through some controls in a Powershell / WPF application. Nothing fancy, just setting some text on a mouseEnter event.</p> <p>It works fine if I don't loop the code:</p> <pre><code>$reader = New-Object System.Xml.XmlNodeReader $xaml $d = [Windows.Markup.XamlReader]::Load($reader) $d.FindName("GridOne").add_mouseEnter({ $d.FindName("HelpText").Content = "One" }) $d.FindName("GridTwo").add_mouseEnter({ $d.FindName("HelpText").Content = "Two" }) $d.FindName("GridThree").add_mouseEnter({ $d.FindName("HelpText").Content = "Three" }) $d.FindName("GridFour").add_mouseEnter({ $d.FindName("HelpText").Content = "Four" }) </code></pre> <p>But if I try the same thing as a loop it sets all the controls MouseEnter events to set the text to "Four", the last element of the array:</p> <pre><code>$reader = New-Object System.Xml.XmlNodeReader $xaml $d = [Windows.Markup.XamlReader]::Load($reader) $arrControls = ("One","Two","Three","Four") foreach ($control in $arrControls) { $d.FindName("Grid$control").add_mouseEnter({ $d.FindName("HelpText").Content = $control }) } </code></pre> <p>Anyone have any thoughts why this is, and how I can fix it?</p> <p>Thanks,</p> <p>Ben</p> <p>OK - This is even weirder...</p> <p>Tried to address this using a solution along the lines of Kent's suggestion. I got the same using $localControl, so thought I'd try using an array to ensure each entry was distinct:</p> <pre><code>$i = 0 $localControl = @() foreach ($control in $arrControls) { $localControl += $control write-host "$d.FindName('Grid$control').add_mouseEnter({ $d.FindName('HelpText').Content = $control })" $d.FindName("Grid$control").add_mouseEnter({ $d.FindName("HelpText").Content = $localControl[$i] $i = $i + 1 }) } </code></pre> <p>The behaviour I know get is that each time I mouseOver a control, the text just increments through the array one step. For example, the first control I hover over will output "One", the next will output "Two" and so on, until my array is exhausted when it just outputs null.</p> <p>This "One", "Two", "Three", "Four" output order is the same regardless of the order I hover over the controls.</p> <p>... Wait a minute. Have put the $i = $i + 1 in the MouseEnter!</p> <p>Amended to:</p> <pre><code>$i = 0 $localControl = @() foreach ($control in $arrControls) { $localControl += $control write-host "$d.FindName('Grid$control').add_mouseEnter({ $d.FindName('HelpText').Content = $control })" $d.FindName("Grid$control").add_mouseEnter({ $d.FindName("HelpText").Content = $localControl[$i] }) $i = $i + 1 } </code></pre> <p>Sets all the outputs to null.</p>
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