C backgroundworker progress bar not updating
It works by setting a minimum and maximum value and then incrementing a value, which will give a visual indication on how far in the process you currently are.Here's a very basic example to demonstrate it with: In this case, I've used a pretty standard approach of showing progress as a percentage (between 0 and 100%), giving it an initial value of 75.The Progress Bar is, just like other standard WPF controls, rendered to match the visual style of the operating system.Here on Windows 7, it has a nice animated gradient, as seen on the screenshot.The result is a lot of frustrated forum posts from people who are trying to run a lengthy process while updating a progress bar, only to realize that the progress bar is not updated until the process is done running.
For this you need to understand multi-threading and how it effects your program.
At these “checkpoints,” a task continuation is used to update the UI.
The C# FAQ blog has an entry describing this approach.
The above example illustrates how simple it is to use a Progress Bar, but normally you would of course want to show the progress of some actual work and not just a static value.
In most situations you will use the Progress Bar to show progress for some heavy/lengthy task, and this this is where most new programmers run into a very common problem: If you do a piece of heavy work on the UI thread, while trying to simultaneously update e.g.