BackgroundWorker tutorial - Skin Investigation

BackgroundWorker tutorial

C# BackgroundWorker Tutorial


BackgroundWorker screenshotBackgroundWorker makes threads easy to implement in Windows Forms. Intensive tasks need to be done on another thread so the UI does not freeze. It is necessary to post messages and update the user interface when the task is done.

Threads

Steps

In the image, you see the Visual Studio designer view. The fly-out panel is the Toolbox—it contains links for all kinds of controls. It also contains the BackgroundWorker link, which we can use in the following steps.

First, click on BackgroundWorker. You will need to double-click on BackgroundWorker link in the Toolbox. Look at the gray bar near the bottom of your window. A BackgroundWorker will appear there.

BackgroundWorker in Visual StudioSecond:Highlight backgroundWorker1. Click on the backgroundWorker1 item in the gray bar on the bottom. Now, look at the Properties panel.

Third:Look for the lightning bolt.
You will see a lightning bolt icon in the Properties pane.
This is Microsoft's icon for events.

Tip:BackgroundWorker is event-driven, so this is where we will make the necessary events to use it.

Then, double-click on DoWork. Sorry, but we have to begin working. Double-click on DoWork, which will tell Visual Studio to make a new "work" method.
In this method,
you will put the important,
processor-intensive stuff.

The rectangles show the tray at the bottom containing the backgroundWorker1 icon, and the Properties panel on the right. The lightning bolt helps us easily add events to the BackgroundWorker.

Lightning boltTip:This UI is far better than trying to type the methods in manually. It requires less effort on your part.

DoWork

The DoWork method is like any other event handler. Here we must look at the C# view of your file, where we will see the DoWork method. You should see that the backgroundWorker1_DoWork event is generated when you double-click on DoWork.

For testing, let's add a Thread.Sleep command there. The Thread.Sleep method will pause the execution of the BackgroundWorker, but does not consume the entire CPU. It will show us threading is functioning.

Sleep

Example that shows DoWork event handler: C# using System; using System.ComponentModel; using System.Windows.Forms; using System.Threading; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1 { InitializeComponent; } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { Thread.Sleep(1000); // One second. } } }



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FAQ

stu_coates1
In Adobe Indesign, how can i import an image and use it as a light background which i plan to write over?

I am new to Indesign. I know its got something to do with layers but i'm a bit lost...

If anyone knows any websites that explain Indesign in 'basic terms', it would also be much appricated

Import the image by going to File > Place locate your picture you want to import then click open. Click anywhere on your page to place the image. Then to screen back your image make sure you have it selected then locate your transparency slider and change the percentage. Depending on what version of In Design your using this step may vary. In design CS3 it is under effects > opacity. Adobe offers books called Class Room in a Book for all of there programs available at any book store or Amazon.com. Also you can always go to the HELP menu provided with every program located on the…

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How to make an image background transparent in Adobe InDesign?

I heard you have to do in PhotoShop but I'm very new to the program and can't figure out how to do it. Please describe it simply, step by step! Thanks!

If you want to extract an image from a background, it's best to use a raster image editor to do it, Photoshop can certainly do it. Photoshop has much more advanced selection capabilities - and allows you to refine edges to get almost perfect extractions.

You could add a cliping path in InDesign to do it too, but you would get better results using Photoshop.

If you want to find out how to do it in InDesign - Google this "InDesign add clipping path to image tutorial"

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