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For example, a background thread that is spun off from the main UI thread cannot update the contents of a Button that was created on the UI thread.
Today we'll wrap up our series by adding a progress bar to the graphical status box we created a few lessons ago. Forms #title for the winform $Title = "Directory Usage Analysis: $Path" #winform dimensions $height=100 $width=400 #winform background color $color = "White" #create the form $form1 = New-Object System.
Here's the first part of the code again creating the form and the label.
Form Start Position]:: Center Screen # create label $label1 = New-Object system.
Width= $width - 20 #adjusted height to accommodate progress bar $label1.
Add($progress Bar1) Now I can show the form and start the main part of my Power Shell script. Refresh() start-sleep -Seconds 1 #run code and update the status form #get top level folders $top = Get-Child Item -Path $path -Directory #initialize a counter $i=0 As I've been doing all along, I'll use For Each to process each item, calculate my percentage complete and use that value for the progress bar. You can get the same result using Write-Progress, which is frankly a little easier to use.
Focus() | out-null #update the form $label1.text="Preparing to analyze $path" $form1.This is accomplished by using either Invoke or Begin Invoke.Invoke is synchronous and Begin Invoke is asynchronous.From that event handler I wanted to update something on the user interface.If I update that UI item directly from the event I got the following exception being thrown. w=448" class="size-full wp-image-2160" src="https://stephenhaunts.files.wordpress.com/2015/06/exception.jpg? w=750" alt="Thread Exception" srcset="https://stephenhaunts.files.wordpress.com/2015/06/448w, https://stephenhaunts.files.wordpress.com/2015/06/exception.jpg? w=150 150w, https://stephenhaunts.files.wordpress.com/2015/06/exception.jpg? w=300 300w" sizes="(max-width: 448px) 100vw, 448px" / The solution is to use the Dispatcher.The operation is added to the event queue of the Dispatcher at the specified Dispatcher Priority. There are two demo projects in the solution, restore the Nu Get packages and fire them both up. Size = $System_Drawing_Size Using the values for the label and some trial and error, I specify where the progress bar should start on the form. But if you would like something different or perhaps you like taking matters into your own hands, then feel free to build a simple Windows form and use a progress bar control. Top = 40 Finally, like the other controls, the progress bar needs to be added to the form. foreach ($folder in $top) #foreach At the end of the script I clean up after myself and close the form. If you use Write-Progress in the ISE you even get a pretty, graphical progress bar. About the Author Jeffery Hicks is an IT veteran with over 25 years of experience, much of it spent as an IT infrastructure consultant specializing in Microsoft server technologies with an emphasis in automation and efficiency. To learn more about Power Shell toolmaking, grab a copy of Learn Power Shell Toolmaking in a Month of Lunches and head to the forums at Power when you need some help.