@@WillEhrendreich Just test it like you would any task based method. If you are using Mock, there are some setups you can also use by returning yourData.ToAsyncEnumerable in the setup.
YOU ARE BOSS... you know that ❤, I have 10 years of experience in .NET Development but this is the first channel I have subscribed which talks about coding :)
Thanks a lot for your videos! 1. What to practice in order to be good at understanding complex systems? 2. How to get over the feeling of overwhelming when trying to learn? I always try to rush through a topic knowing that there are other stuff needed to be learnt.
@David P, do you have an example of a complex system and/or language(s) to target it with? For instance, in my department, we code for a 6-axis arm on a linear rail in the pharmaceutical robotics industry. This can be difficult for some, business as usual for others. Frankly, it's a really fun product line that flosses the brain daily.
Sorry for butting in but the answer for number 2 is kinda in the question. Don't try to rush through things. Test them yourself, even better if you have a project where you can use new functionality in a "real life" scenario. Even if a video is 10 minutes, it doesn't mean you will learn it in 10 minutes. Spend an hour or two mucking around with IAsyncEnumerable after watching this video. See how it behaves. Atleast this is how I learn things.
1. Complex systems don't start out complex. They all start out simple, and then complexity grows over time. Each system is also different, so there is not "one size fits all" approach to understanding complex systems. The only thing that will make a complex system easier to understand is spending time working in that system. 2. As @Diego pointed out, don't try to rush to learn something. Learning comes with time and experience working with something. The longer you work with it, the more you'll know about it.
@Brain thanks for a video, could you please answer in which case I should use async enumeration? Could I use it in the repository ? for examples to fetching data using where expression. What is the right type to return list or enumerable?
Thanks! I got interested how this "await foreach" would translate because I know "foreach (MyObject o in e) ..." translates to "while (e.MoveNext()) ..." and it turns out "await foreach" becomes "while (await e.MoveNextAsync()) ...". It makes it easier to remember if I know how it really works.
@@BrianLagunas your videos helps a lot, they are very well planned and executed! Silverbullets for most topics! I cant stress enough how much it means! Thank you!!
I have a question about being asked tech questions during an interview. I was asked a 3 times in different interviews "What is a delegate? / Explain delegate(s)". After being asked 1 time and not having an answer I learned that its sending a method as a parameter, but after 10 years I've gotten by without using delegates. "When would you want to use delegates in web development?"
A delegate is simply a pointer to methods with a particular parameter list and return type. When you instantiate a delegate, you associate its instance with a method with a compatible signature and return type. When you the call the delegate instance (or invoke it), you invoke the method the delegate points to. Delegates are used to pass methods as arguments to other methods. I hope that helps until I can do a video.
Well, @Brian, I came across your video because I came across an issue with the IAsyncEnumerable and yield return. Your exercise added an item that won't work for me. I don't want a delay but without anything awaited I get the a warning that it won't run asynchronously. Try your above project without the delay item and tell me how you fix that issue.
@@BrianLagunas Are you able to provide an example of what you mean? In my situation I'm writing a command line tool that is processing multiple, fixed-size files as part of image creation. Loading and processing in parallel or asynchronously would be an ideal situation. Given that async and parallel don't play very nice with one another...
Hey Brain, public void RegisterTypes(IContainerRegistry containerRegistry) { containerRegistry.Register("UserServices"); containerRegistry.Register("TestService"); } How prism will create instance for 2 classes. Please post an small video explaining.
I'm not sure I understand your question, but if you want to know how to use yield return synchronously watch this video: ua-cam.com/video/HRXkeaeImGs/v-deo.html
thank you a lot for the tutorial yet it throws me and error: The non-generic type 'IAsyncEnumerable' cannot be used with type arguments IAsyncEnumerable
Great explanation. I have a different question to prism. Is there a way to automatically set the focus to an textbox inside a usercontrol that has been activated using the regionmanager? The FocusManager isn´t working.
@@pgc1721 You don't need the yield break logic, just pass the token to the Task.Delay and it will throw the OperationCanceledException which will cancel it
My next question is: what's the point of using asynchronous programming in web apps or web APIs??? while there is no UI to be blocked? I mean there is a UI actually, but it is on the client side and running on another machine
I'm not as experienced with web APIs so I did some research and found this doc: docs.microsoft.com/en-us/aspnet/core/performance/performance-best-practices?view=aspnetcore-3.1. It states "Asynchronous APIs allow a small pool of threads to handle thousands of concurrent requests by not waiting on blocking calls. Rather than waiting on a long-running synchronous task to complete, the thread can work on another request."
Your videos are great, I have your 🔔 on and don't miss a single video of you. I have a question which doesn't even need a video. Is the async - await approach best choice for IO operations in desktop applications like WPF and WinForms? Or I should consider using threads?
Brian, could you show your method of using the SecureString in Prism/WPF/MVVM? For instance, I have service that I want to securely store the password in the app/ViewModel until the service method is called. Or point me to one of your previous posts/blogs.
SecureString is not an alternative to encryption or hashing, it is a complement. Think layered security. SecureString is not when you already have a string and want to it be secure, it is when you want to read keyboard input, one character at a time, in a secure way, because with a regular string it would be stored in memory in the heap and you could inspect it with a memory debugger to uncover it.
It’s not a compliment either. It just makes the window getting the plain text shorter; it doesn't fully prevent it as .NET still has to convert the string to a plain text representation. Don’t ever use SecureString.
I wouldn't recommend using the default data grid control. I would use a professional data grid from companies like Infragistics. If you must use the default data grid, to group and filter use a CollectionViewSource instead of an ObservableCollection
Brian, Im having a hard time programming a complex tables with custom rows and totals. is it WPF the right choice to make dynamic complex tables with many binding and calculations?
Not having any context to your problem, yes, you can build dynamic tables in WPF. You could also use a JavaScript stack. Just depends on the requirements of your app.
I have two list object and contains crores of data in both list. I want to loop through with one other list and return a new set of list. Can you please give me the best solution for this to reduce the performance issues?
Lots of ways to do this. You can use firstList.Concat(secondList), you can use firstList.AddRange(secondList), you can use secondList.ForEach(item => firstList.Add(item)), you can use yield return to return each item from each list. Those are just the ones I can think of off the top of my head. I am sure there are more.
@@BrianLagunas You almost have 10K subscribers, which is a big number if you think about it. I just thought it'd help you to build a community base (BTW Sorry for writing "Brain" instead of "Brian".)
Popped in my feed, didn't search for this video. Congrats, UA-cam is recommending your videos for people learning c#.
Wow.... that's awesome. Thanks for letting me know. Exciting times
Wow, what a great video. You have a gift for explaining things that are not easy at all in a very simple manner. Way to go!
Thank you so much.
Oh my goodness thank you so much for answering my question! That's so awesome!
I can't believe I missed it the day it came out!
You are very welcome! Thanks for the great question
@@BrianLagunas how would you go about testing iasyncenumerable?
@@WillEhrendreich Just test it like you would any task based method. If you are using Mock, there are some setups you can also use by returning yourData.ToAsyncEnumerable in the setup.
Hey Brian you are simply great.. Really inspiring for the developers to change the way to write the code efficiently. Thanks.
Thank you so much for the kind words. It really helps motivate me to create more content.
Excellent. Simple and crisp. Showed very well how to use IAsyncEnumerable!
Thanks for watching
You are a star!! Thanx a lot for your tutorials Brian!! Best regards from Greece!!
Thank you so much! I appreciate your support
Great video. I hope you start making videos again!
Very well explained Brian. I like the way how you compare it with your previous video of yield. Keep it up.
Thank you so much
YOU ARE BOSS... you know that ❤, I have 10 years of experience in .NET Development but this is the first channel I have subscribed which talks about coding :)
Thank you so much
wow, this is amazing. I expect next video. Many thanks
Thank you very much
This video was really good; and it made sense. Awesome job Brian.
Thank you very much
Another one over the center field fence! Exactly what I was wondering about.
Thank you for watching
Thank you. this was best explained here than anywhere else for my understanding
Thank you so much
Great explanation from the creator of Prism.. Had been a fan since quite sometime..
Thank you so much
This is a great explanation and demo!
Thank you very much
Life changed, thanks Brian!
Thank you for watching
Super awesome Brian, thanks
Thanks for watching
Very helpful video. Thankyou
Thank you for watching
Great video thanks. Just popped into my feed and it helped me a lot to understand.
I’m glad I could help
Wow…love the way you explained!
Thanks for watching
I use this to stream live FOREX prices from a broker. I'm so glad they put this in there.
Ahhh... good 'ol FOREX feeds. Not many people are exposed to those pains 🤣
@@BrianLagunas It's definitely an interesting animal. Thankfully the data has gotten a lot more reliable and accessible over the years.
Great video, didn't know the IAsyncEnumerable 👍
Glad I could help.
Great explanation!!! thanks!
Thanks for watching
Thanks a lot for your videos!
1. What to practice in order to be good at understanding complex systems?
2. How to get over the feeling of overwhelming when trying to learn? I always try to rush through a topic knowing that there are other stuff needed to be learnt.
@David P, do you have an example of a complex system and/or language(s) to target it with?
For instance, in my department, we code for a 6-axis arm on a linear rail in the pharmaceutical robotics industry. This can be difficult for some, business as usual for others. Frankly, it's a really fun product line that flosses the brain daily.
Sorry for butting in but the answer for number 2 is kinda in the question. Don't try to rush through things. Test them yourself, even better if you have a project where you can use new functionality in a "real life" scenario.
Even if a video is 10 minutes, it doesn't mean you will learn it in 10 minutes. Spend an hour or two mucking around with IAsyncEnumerable after watching this video. See how it behaves. Atleast this is how I learn things.
1. Complex systems don't start out complex. They all start out simple, and then complexity grows over time. Each system is also different, so there is not "one size fits all" approach to understanding complex systems. The only thing that will make a complex system easier to understand is spending time working in that system.
2. As @Diego pointed out, don't try to rush to learn something. Learning comes with time and experience working with something. The longer you work with it, the more you'll know about it.
I love your videos because you get straight to the point
Thank you so much.
What about returning a IEnumerable ?
Exactly what I need!! 👌🏼Cristal Clear explanation! 👏🏼👏🏼👏🏼Thanks!
Thanks for watching
Very good thank you.
Thank you so much
Great video! I am glad you showed trying to wrap the get lines in a Task since that would have been my first go to attempt.
Thanks. I decided to do that because that's what I first tried when I was learning it 🤣
@Brain thanks for a video, could you please answer in which case I should use async enumeration? Could I use it in the repository ? for examples to fetching data using where expression. What is the right type to return list or enumerable?
Hi Brian,
When to use Tuple and when to create a Class/Record?
What are the benefits of using Tuple?
When the use of Tuple is not recommended?
Thanks
Thanks for the suggestion! As soon as I get some time I'll get back to recording videos.
学到了，谢谢老哥。thanks
非常感谢你
Brian, could you please explain [Slim]Semaphore-ing
thanks for the idea
Great explanation! thanks :)
Thanks for watching
Thank you very much 👏👏👏💯
Thank you for watching
Awesome dude ! Very useful and I didn't know this before
Great to hear! Thanks for watching
9:43 you have my subscription, you persuaded me
Thank you
Thank you.
You’re very welcome
Thanks! I got interested how this "await foreach" would translate because I know "foreach (MyObject o in e) ..." translates to "while (e.MoveNext()) ..." and it turns out "await foreach" becomes "while (await e.MoveNextAsync()) ...". It makes it easier to remember if I know how it really works.
Great distinction!
you are just awesome!
Thank you so much for the kind words
@@BrianLagunas your videos helps a lot, they are very well planned and executed! Silverbullets for most topics! I cant stress enough how much it means! Thank you!!
This is very helpful. Thank you so much for this great tutorial.
Thank you for watching
I have a question about being asked tech questions during an interview. I was asked a 3 times in different interviews "What is a delegate? / Explain delegate(s)". After being asked 1 time and not having an answer I learned that its sending a method as a parameter, but after 10 years I've gotten by without using delegates.
"When would you want to use delegates in web development?"
A delegate is simply a pointer to methods with a particular parameter list and return type. When you instantiate a delegate, you associate its instance with a method with a compatible signature and return type. When you the call the delegate instance (or invoke it), you invoke the method the delegate points to. Delegates are used to pass methods as arguments to other methods. I hope that helps until I can do a video.
So clear, thank you Brian :)
Thank you for watching
Well, @Brian, I came across your video because I came across an issue with the IAsyncEnumerable and yield return. Your exercise added an item that won't work for me. I don't want a delay but without anything awaited I get the a warning that it won't run asynchronously. Try your above project without the delay item and tell me how you fix that issue.
You need to await a Task based method in order to use it.
@@BrianLagunas Are you able to provide an example of what you mean? In my situation I'm writing a command line tool that is processing multiple, fixed-size files as part of image creation. Loading and processing in parallel or asynchronously would be an ideal situation. Given that async and parallel don't play very nice with one another...
amazing video !! thanks for the clear explanation!! loved it
Thank you so much
Thanks for the explanation. Great content 👍
Thank you once again for your continued support
Hey Brian, Thank you for the wonderful video. Could you elaborate what is happening under the hood of yield and IAsyncEnumerable?
Can you please talk about the difference between "x:Name" and "Name" in WPF
What could be a nice short video. Thanks for the idea
It’s great. I could solve my problem.
Wonderful. I'm so happy to hear that
Great video
Thank you very much
Hey Brain,
public void RegisterTypes(IContainerRegistry containerRegistry)
{
containerRegistry.Register("UserServices");
containerRegistry.Register("TestService");
}
How prism will create instance for 2 classes. Please post an small video explaining.
What is the neccessity of Yield return??
Did u check it by syncronisely ruuning it how much time it consumes?
I'm not sure I understand your question, but if you want to know how to use yield return synchronously watch this video: ua-cam.com/video/HRXkeaeImGs/v-deo.html
Can you make a video on Task v/s Threads
That's actually on my list. I just haven't gotten around to it yet
thank you a lot for the tutorial yet it throws me and error:
The non-generic type 'IAsyncEnumerable' cannot be used with type arguments IAsyncEnumerable
Hi Brian,
In a delegate command, How to make a CanExecute evaluation based on completion of some task? Kind of Lazy Can Execute.
You don't 🤣
@@BrianLagunas that's sad.
AWESOME!
Thanks for watching
How to use IAsyncenumerable in CQRS , MediatR
Good stuff
Thanks for watching
Great explanation. I have a different question to prism. Is there a way to automatically set the focus to an textbox inside a usercontrol that has been activated using the regionmanager?
The FocusManager isn´t working.
This isn't really Prism related, but focus in general is a pain. It will have to be done on the UI layer usually via behaviors or attached properties.
amazing code !!!
Thank you
Hi,
Thanks for the nice demo.
What If I want to break the WHILE loop, while the line data is being populated in the ListBox?
Thought of using Cancellation Token. But I would like to know your approach. Thank you in advance.
private async IAsyncEnumerable GetLines(string filePath, [EnumeratorCancellation] CancellationToken token)
{
string line;
StreamReader file = new StreamReader(filePath);
while((line = await file.ReadLineAsync()) != null)
{
await Task.Delay(400);
yield return line;
if(token.IsCancellationRequested)
{
yield break;
}
}
}
@@pgc1721 You don't need the yield break logic, just pass the token to the Task.Delay and it will throw the OperationCanceledException which will cancel it
very nice
Thank you very much
My next question is: what's the point of using asynchronous programming in web apps or web APIs??? while there is no UI to be blocked? I mean there is a UI actually, but it is on the client side and running on another machine
I'm not as experienced with web APIs so I did some research and found this doc: docs.microsoft.com/en-us/aspnet/core/performance/performance-best-practices?view=aspnetcore-3.1. It states "Asynchronous APIs allow a small pool of threads to handle thousands of concurrent requests by not waiting on blocking calls. Rather than waiting on a long-running synchronous task to complete, the thread can work on another request."
Your videos are great, I have your 🔔 on and don't miss a single video of you. I have a question which doesn't even need a video. Is the async - await approach best choice for IO operations in desktop applications like WPF and WinForms? Or I should consider using threads?
Async/await is perfect for IO operations. Don't use thread unless you absolutely need the extra control.
Perfect!
Thank you
Brian, could you show your method of using the SecureString in Prism/WPF/MVVM? For instance, I have service that I want to securely store the password in the app/ViewModel until the service method is called. Or point me to one of your previous posts/blogs.
SecureString actually isn't secure at all. You're better off just encrypting/hashing the password.
@@BrianLagunas Show us some encryption then 😀
SecureString is not an alternative to encryption or hashing, it is a complement. Think layered security. SecureString is not when you already have a string and want to it be secure, it is when you want to read keyboard input, one character at a time, in a secure way, because with a regular string it would be stored in memory in the heap and you could inspect it with a memory debugger to uncover it.
It’s not a compliment either. It just makes the window getting the plain text shorter; it doesn't fully prevent it as .NET still has to convert the string to a plain text representation. Don’t ever use SecureString.
what about a video for wpf datagrid filtering and grouping
I wouldn't recommend using the default data grid control. I would use a professional data grid from companies like Infragistics. If you must use the default data grid, to group and filter use a CollectionViewSource instead of an ObservableCollection
@@BrianLagunas yes i was looking for a video for CollectionViewSource with mvvm
but what is wrong with the default datagrid control
Really great stuff, how about memory streams and Yield? Do you any tutorial?
sorry, but I don’t have an videos on memory streams yet
wow, better implementation than Application.DoEvents or Control.Invoke() inside user-threads.
LOL... I agree 🤣
Long...long...long time no see Brian. Where are you?
I missed your live streaming.
I hope you are ok.
Everything is good. Just working my day job. Hoping to get time to record more content soon.
Subscribed!!
Thank you very much
I love to see it on production
I use it in production 😃
Brian, Im having a hard time programming a complex tables with custom rows and totals. is it WPF the right choice to make dynamic complex tables with many binding and calculations?
Not having any context to your problem, yes, you can build dynamic tables in WPF. You could also use a JavaScript stack. Just depends on the requirements of your app.
@@BrianLagunas how can i send you a file so maybe you can get a look into it?
@@mariomorazan9473 while I would love to help, I just don't have the time. I'm so sorry.
@@BrianLagunas it's alright I wasn't expecting you to work for free. XD thank you anyways.
Hey Brian, We miss you
Thank you so much. My day job is keeping me really busy. I hope to get back to recording some new videos soon
Love it
Thanks for watching
What if I need to read into the ObservableColleciton? Does it bring some changes into the approach you described in the video?
Not sure what you mean exactly, but you can put any logic you wish into a "yield return" enumerator method. This is how LINQ works.
We did something similar but looped coroutines in an async manner or something like that.
Interesting. Thanks for sharing
I have two list object and contains crores of data in both list. I want to loop through with one other list and return a new set of list. Can you please give me the best solution for this to reduce the performance issues?
Lots of ways to do this. You can use firstList.Concat(secondList), you can use firstList.AddRange(secondList), you can use secondList.ForEach(item => firstList.Add(item)), you can use yield return to return each item from each list. Those are just the ones I can think of off the top of my head. I am sure there are more.
Hi Brian! Have you considered creating a Discord server specifically for your YT channel?
I have, but I'm not sure anyone would really want to join it. Plus with my limited amount of time I'm not sure how often I could participate myself.
@@BrianLagunas You almost have 10K subscribers, which is a big number if you think about it. I just thought it'd help you to build a community base (BTW Sorry for writing "Brain" instead of "Brian".)
You're right. 10K is a lot. I will think about it a little more. I would just want to make sure that it would provide value to people.
Brian, it's me again. Let's make it hard (to me) how can you set the ambient for binding like datacontext in a dependencyobject.
I'm sorry, but I don't understand your question. What do you mean by "set the ambient for binding"
Not available in .NET Framework.
Correct. Only available in .NET Core 3.0 and above
Hi Brian, long time no feed... is everything ok? We miss u. (K1)
Yes, everything is good. I have been really busy at work and then I have been on vacati0n. I will be back soon.
Good one thanks :)
In VB6 i'd just add DoEvents inside the loop. BAM, UI is responsive again! Ah... The good ol' days
🤣🤣🤣 I remember those days. Good times
that bright white is blinding :D
Nice!
dope
Thanks for watching
Dude, why light mode, my eyes!!!
Dark mode sucks for most environments, especially when presenting.