Winforms progress bar not updating
When running multiple consecutive processes as part of one action, use one bar for the entire action than a new one for each process. You can do all sorts of property setting and manipulating on any left field thread. Within that method, do all the calls to BeginInvoke and such that we did before. To set a progress bar to indeterminate mode is simple. Since every control in our form was created from a single thread, the main thread, we can't set the value of our progress bar from our new thread that we are running.
This is so that we have a process that takes roughly the same amount of time as that single call, but now we have information that we can feed to our progress bar. When the application receives a variable amount of data from another application.
Multithreading is the act of making two processes in a program run simultaneously independent of each other. There will be plenty of time to do that later. First, let's add a ProgressBar to the bottom of our form, just under the button.
In this case, it allows us to run a process without holding up all the important things that the main thread is working on, such as, you know, looking pretty. When the application is working with an external library with limited access to the source code. Every multithreaded application is going to use the Thread class somewhere.
Many programmers use multithreading to great effect, but it is also a double-edged sword. In these cases, you can't really give a definite amount of progress since there is nothing that indicates when the process will be done. There are a few other places in the program where you have to use InvokeRequired as well.
However, this also has the glaring drawback of whenever this main thread locks up for any reason, everything comes to a screeching halt until the thread becomes available again. Making a control public exposes all of its properties, some of which don't work properly if you change them from other classes or forms. An increment of one on a scale of a hundred thousand will not prompt a change of the length of the progress meter.
That is the problem I thought you wanted to solve. Before we call this article wrapped up, there's one more thing we should go over. Most people won't even realize it. Think of it like a busy interstate highway.
The Action class wraps anonymous methods in a delegate, allowing their use in cases such as this. In this case, let's go ahead and use BeginInvoke, since there isn't really any reason to hang up our important and time-consuming process to wait for the progress bar to update itself. The good news, however, is that during these times that Invoke can't be used, it isn't actually needed.
Your program is now too clever for you to break it so easily. When running a process that is known to not take longer than a second or two to complete, simply running the process in a background thread could be more productive than a progress bar. Don't forget to put this code in your program, or you will sit and wonder why your process isn't running, even after you pressed that button.
However, you still need some indication of progress to show your users that something is, in fact, being done. If you aren't careful about your code, multithreading can quickly become confusing, cumbersome, and downright impossible to debug. In this way, you can trick the progress bar into thinking that our code is running on the main thread, even though it originated from somewhere else entirely.
Like, maybe you have a button that saves the current state of your program. However, sometimes there just isn't any way to tell how close to finishing a particular process is.
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