So many tutorials on the web, but I get the feeling your are the dean of developers.
@IAmTimCorey Жыл бұрын
Thank you!
@maheshmasanam77212 жыл бұрын
It is good video. you explain the start up writing on extension methods in seperate class and meaning the this key word more super. i confused in this understanding but now i am so clear. Thank you tim corey
@IAmTimCorey2 жыл бұрын
Glad it was helpful!
@BracketGuySerious2 жыл бұрын
Gotta say it physically hurt when you put your extension class in the System namespace, good thing you mentioned that it should NOT be used like that.
@hammadiazaiez93375 ай бұрын
I'm still a student, and I promise you, you will receive a portion of my first salary. Thank you so much for these valuable resources. You couldn't imagine the feeling of joy when I search for a topic and find one of your videos among the results.
@IAmTimCorey5 ай бұрын
I am glad they have been helpful.
@mathsdaz3 жыл бұрын
Thanks for this Tim. One interface I frequently extend in most libraries I write is the IServiceCollection so that setting up dependency injection for the library is easier to consume. I appreciate your expertise on these topics.
@jemsworld3 жыл бұрын
That's great can you provide sample extension code implementation for IServiceCollection?
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for the tip
@DodgerDude742 жыл бұрын
Thank you! I followed the tutorial and then created the .sln/.csproj on my own. Very nice intro to extension methods. Now, with great power comes great responsibility!
@IAmTimCorey2 жыл бұрын
You are welcome.
@nancyrohilla39323 жыл бұрын
Thanks Tim. The way you make me understand is awesome.
@IAmTimCorey3 жыл бұрын
Glad to hear that!
@usamatabbassum7350 Жыл бұрын
That was amazing. Learning things so quickly with these tutorials. Thanks Tim.
@IAmTimCorey Жыл бұрын
You are welcome.
@chrisspellman59523 жыл бұрын
I've used extension methods, but only ones I found. I had a bunch saved/bookmarked. I honestly thought it had to do something with how you named things or something in the standard libraries I just wasn't aware of... it was just "this class". It makes so much sense now!
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for watching.
@patyue50123 жыл бұрын
Perfect timing and found your tournament course also using this technique for the textConnector
@IAmTimCorey3 жыл бұрын
Great!
@hazlotumismo14193 жыл бұрын
I'm very happy because this is the first time I did know how to do all the things that this video has demonstrated. Yeiii!! Thank you Tim, you're the best!!!
@IAmTimCorey3 жыл бұрын
Excellent!
@minitycui98623 жыл бұрын
Great video. Tim, thank you for such a detail, organized, and straightforward demonstration of method extension. You really are making C# easy.
@tomthelestaff-iamtimcorey75973 жыл бұрын
That is his goal, thanks for watching.
@torrvic11565 ай бұрын
Excellent lesson as usual! I am using my extension methods for manual mappings when I need to convert Model to DTO and vice versa. It works like charm.
@IAmTimCorey5 ай бұрын
Great!
@badboydessert3 жыл бұрын
Hi, Tim! You're a great teacher!
@IAmTimCorey3 жыл бұрын
Thanks!
@prabirchoudhury83753 жыл бұрын
@@IAmTimCorey Request for future discussion Video - * there was a thing called Params array in .net standard fmwk. If it still exists, A good, elaborate code discussion video on same. Thanks
@juanminglao36993 жыл бұрын
Thank you, I had seen these syntaxes before but I never knew what it did.
@tomthelestaff-iamtimcorey75973 жыл бұрын
Good luck with your implementations of this. Please give us updates!
@Strrroke3 жыл бұрын
Perfect timing! Just when I thought where to implement extension methods in my pet project for portfolio.
@tomthelestaff-iamtimcorey75973 жыл бұрын
He did not cover it, but he has a mind reading extension also. Just kidding!!!
@alexsnegir14273 жыл бұрын
Looking forward to seeing some videos about DDD, Microservices, and ElasticSearch.
@tomthelestaff-iamtimcorey75973 жыл бұрын
I noted your recommendation by adding it to Tim's list of possible future topics, thanks.
@smarthumanism32213 жыл бұрын
Wonderful, very helpful lecture this is! Thanks, Tim. After seeing this class, I am eager to know the counterparts on properties or fields.
@GBSCronoo3 жыл бұрын
Thank you, I have been looking for a good tutorial on extention methods, popped up at a great time.
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for trusting Tim for your training.
@azgan1233 жыл бұрын
Holy shit why had no one taught me this sooner! Awesome
@rblew1313 жыл бұрын
Seriously!
@IAmTimCorey3 жыл бұрын
I’m glad it was helpful.
@whosgotrythm3 жыл бұрын
Needed this last week! Thanks though
@IAmTimCorey3 жыл бұрын
Well, better late than never, I guess.
@adamheeg60003 жыл бұрын
Love these things. Been using them for awhile, they write and read much easier. I like to wrap existing string functionality so I can do: string myString = ""; if (myString.IsNullOrEmpty()) ... and then just have the extension method like so. public static bool IsNullOrEmpty(this string str) { return string.IsNullOrEmpty(str); } Or better yet, when writing logic to append a middle name... public static string AppendIfNotNull(this string str, string textToAppend, string separator = ", ") { if (textToAppend.IsNullOrEmpty()) { return str; } return $"{str}{separator}{textToAppend}"; }
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for sharing
@krzysztofpaszkiewicz12743 жыл бұрын
I knew the first part, but that string at 7.30 just blew my mind.
@IAmTimCorey3 жыл бұрын
Great!
@selmanalfaris35443 жыл бұрын
I am new to C# and I really like your way of teaching.I have request could a make a video on various commands in C#
@faithyintii84573 жыл бұрын
Check his videos, he has an intro to c#
@IAmTimCorey3 жыл бұрын
Its overkill, but try this - kzfaq.info/sun/PLLWMQd6PeGY2GVsQZ-u3DPXqwwKW8MkiP. There is no 10 min video for it, but you can grow your skills in a logical path.
@selmanalfaris35443 жыл бұрын
Thank u Tim keep up the good work
@heenachhabra29773 жыл бұрын
Thank you for this informative video, I am learning .NET concepts wise and this really helped clarify the purpose of extension methods!
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for trusting Tim for you training.
@zhujacky71113 жыл бұрын
Thank you, Tim! It's a great course!
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for watching
@andywalter74263 жыл бұрын
I actually found lots of good use for extending even the string type. For example, I have an extension where a person has a month spelled out and it returns the number from 1 to 12. Another one I have for strings is if a person has a sentence and need to know the month integer found in the string, then I have it as well. Even being able to easily generate a comma delimited list. The truth is even for the simple types like string ,integers, there are many useful extensions that can be created. One good one for int is being able to convert to any enum as long as the number sent matches the number it corresponds to in the enum. There are many other examples of good extensions for all simple types.
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for the tips!
@delw11383 жыл бұрын
Another great one Tim!
@IAmTimCorey3 жыл бұрын
Thanks!
@bekawak652910 ай бұрын
awesome tutorial! Thanks
@IAmTimCorey10 ай бұрын
You're welcome!
@tea_otomo3 жыл бұрын
Great video and great topic....too many people out there don't use that feature
@tomthelestaff-iamtimcorey75973 жыл бұрын
Please help us spread the word!
@DasturlashniOrganamiz3 жыл бұрын
That's exactly what they are demanding me to know. Thanks for awesome content
@tomthelestaff-iamtimcorey75973 жыл бұрын
Glad the timing was right for you. Please consider subscribing.
@mahmoudwizzo78233 жыл бұрын
thank you Tim , can you please how we can Mock Testing our Extention Methods as they are static
@tomthelestaff-iamtimcorey75973 жыл бұрын
I added your suggestion to Tim's viewer requests list. In the mean time, have you watched this video on Mock testing from Tim - kzfaq.info/get/bejne/et2SjNuBksvYfY0.html
@kagelind833 жыл бұрын
Hey Tim, thanks for a great video and channel. Was just also watching your async video. Do u have any plans on making a Thread video as well?
@tomthelestaff-iamtimcorey75973 жыл бұрын
I added it to Tim's list for topics to consider. Thanks for recommending it.
@maestrowilliam3 жыл бұрын
very well as always. Thanks
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for watching
@evgpetra15823 жыл бұрын
Excellent tutorial! Thank you very much.
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for the endorsement
@shaunhunterit3422 жыл бұрын
Thanks Tim
@IAmTimCorey2 жыл бұрын
You are welcome.
@davidscarso3 жыл бұрын
Thank you!!! simple to understand :)
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for trusting Tim
@ahmedelgendy5363 Жыл бұрын
Thanks a lot. Very Clear Examples.
@IAmTimCorey Жыл бұрын
You are welcome.
@scotolivera82073 жыл бұрын
Every word count, thank you so much
@IAmTimCorey3 жыл бұрын
You are welcome.
@RalfsBalodis3 жыл бұрын
0:00 - Intro 3:16 - Creating and using extension method 8:15 - Extension method classes and namespaces 10:59 - Extending methods from third party libraries 19:48 - When to use extension methods 21:30 - Extending methods for interfaces 23:03 - When not to use extension methods 27:01 - Summary and concluding remarks
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks - you ROCK!!
@RalfsBalodis3 жыл бұрын
@@tomthelestaff-iamtimcorey7597 check the 10 : 59 typo
@matthewsizemore114 Жыл бұрын
Two thumbs up!!
@IAmTimCorey Жыл бұрын
Thanks!
@stevojohn3 жыл бұрын
If you're not careful with extension method use, it can really make unit testing hard.
@IAmTimCorey3 жыл бұрын
That is true.
@DavidSmith-ef4eh3 жыл бұрын
If you wanted to add features to a 3rd party library, wouldn't it make more sense to create something like a proxy to it and put the helper methods in the proxy instead? Dart supports extension methods too (seems like they are copying c# features or the other way around). Either way, I didn't stumble on a use case for them yet... I did see other people using them to share methods between classes. Don't know if that's a good use case though.
@IAmTimCorey3 жыл бұрын
That's a lot of extra work and it provides you with something you need to support. I don't see how creating a proxy adds value over an extension method. Extension methods are simpler. By the way, you've used extension methods in your C# code even if you didn't know it. Microsoft makes heavy use of them. Almost all of the items off of IServiceCollection are extension methods (AddScoped, AddTransient, AddSingleton, etc.) Also, when we use Dapper, it is basically a couple of extension methods. It extends the IDbConnection interface to add Query and Execute.
@DavidSmith-ef4eh3 жыл бұрын
@@IAmTimCorey Fair point. I'll definitely keep extension methods in mind. Specially since I already see the pattern being used.
@adityarane27583 жыл бұрын
It is really helpful.
@IAmTimCorey3 жыл бұрын
Great!
@carstenberggreen75092 жыл бұрын
Tak!
@carstenberggreen75092 жыл бұрын
Extension methods. So simple and yet so powerfull. Again one of the most elegant and simple explainations. Why spend hours on books when 25 minutes with you along-side brings people up to speed. Love these simple examples and explanations. Supporting you!
@IAmTimCorey2 жыл бұрын
Thank you!
@adoms03 жыл бұрын
Idea for next video topic: SharedProjects - what is it, when use it, pros/cons. Thank you.
@tomthelestaff-iamtimcorey75973 жыл бұрын
Tim addresses a lot of that in kzfaq.info/get/bejne/ib6ShdhnvcndfY0.html. Visual Studios sharing function and using it to work on collaborated projects.
@5h0st0012 жыл бұрын
what if you want to overwrite a value set by a parent in the extension class?
@paulegan3783 Жыл бұрын
Thanks!
@IAmTimCorey Жыл бұрын
You are welcome.
@Gusdc30013 жыл бұрын
This could be handy for IEnumerable classes.
@IAmTimCorey3 жыл бұрын
Yep.
@aduenos3 жыл бұрын
Excellent video, should have learned this sooner! For a future video, would it be possible to do more in depth mvvmcross videos? Thanks for all the great content, best teacher ever award!
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for the recommendation. I have added it to Tim's list of viewer suggestions for videos.
@aduenos3 жыл бұрын
@@tomthelestaff-iamtimcorey7597 Could not ask for more, Thanks!
@ViatorRus3 жыл бұрын
I think that key word is "extension". Somethings not needed in my real program-flow. Is it right? 😉 But your lesson is landed right. .. ;) sorry for my english.
@rianbattle3 жыл бұрын
Your videos have been REALLY helpful. Thanks for everything you do! Question: will you be doing anything on TDD? I'm having trouble wrapping my head around it...mainly where and how to start. I'm about to start developing a new website for my work and am trying to wrap my head around TDD for it
@tomthelestaff-iamtimcorey75973 жыл бұрын
Nothing up to this point. I have added your recommendation to Tim's list of viewer suggestions for videos.
@vatimi3 жыл бұрын
@@tomthelestaff-iamtimcorey7597 pun intended.. at first glance I thought the name was anti-this-channel
@yvinda.landsnes6143 жыл бұрын
Hi Tim. Would you consider it a good practice to implement serialization as extensions to model classes? You touched on it briefly in your video, but it occurred to me that implementing serialization as extension methods makes it easier to switch from say XML to JSON without having to touch the model class(es). You just have to write some new extension methods. Or is it a better way of implementing serialization?
@Imafriggingoddess3 жыл бұрын
Never thought of that. Interesting..
@OnoderaMyGirl7 ай бұрын
ty
@IAmTimCorey7 ай бұрын
You are welcome.
@WTHBrou3 жыл бұрын
Hey Tim. What's your opinion in using PostSharp? For example, in logging. And AOP in general. Just going through a Clean Code C# book and it is implementing it to keep some code with DRY and SRP.
@TutorialsMethod3 жыл бұрын
Please also make video on identity server4!!
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thank you. I have added this to Tim's list of possible future topics.
@MrFoghorn1113 жыл бұрын
Ok Tim, here's a challenge for a video. I always hit a speedbump when I'm working with timed loops, so here's a scenario. You have an API project using a SignalR Hub. Anyone can subscribe to your hub to get data over intervals, but you don't want a million queries to be triggered to your database. You settle on a timed loop that 1. Queries the database. 2. Activates your Hub to send messages to it's subscribers. You can use any type of data here... Stock Tickers, Sports Scores... doesn't matter. Architecturally, which timer would you implement, and how would you allow people to get message at custom intervals. Say their choices are to receive messages every 10, 20 and 30 seconds. Also, the loop shouldn't run unless at least one client is subscribed. That would make an interesting video I think.
@tomthelestaff-iamtimcorey75973 жыл бұрын
Thanks for the suggestion. I have added it to Tim's list of possible future topics.
@navicoo9919 Жыл бұрын
ily.
@yoanashih7613 жыл бұрын
I love extension methods because it makes code clean and readable. But I found that it's difficult to write tests against these extension methods since they are all static methods within a static class.( For instance, they cannot be mocked)
@IAmTimCorey3 жыл бұрын
This is true. However, you can treat them like private classes and not extract them usually. Just test their effect. You can also override them with an actual instantiated method if you write them against an interface.
@yazidarezki375710 ай бұрын
How do you unit test/Mock a class that uses an extension method.
@rodrigo64593 жыл бұрын
I extended DateTime to add a method that can calculate what we call here in Chile Working Days (Mon - Fri) since some stuff will take for example 10 Working Days, and i will like to know on which date those 10 working days will be done, also added an overload that will let you consider the current day as a working day. If any one wants it i can upload to my GitHub... any ways.. i will probably will be modifiying it so you can also pass an array of days you want to exclude from the calculations, lets say you know the 4th of July this year on on Tuesday, since it is not considered as a "working day" you can exclude it, but for now, that is just an idea! :)
@IAmTimCorey3 жыл бұрын
Great examples!
@fzamick3 жыл бұрын
Great video! I'm looking for somethings similar but for properties. Any way to do this in c#?
@IAmTimCorey3 жыл бұрын
Extension methods apply to types, so that means properties. For instance, if you have this code: public string FirstName { get; set; } Then this extension method would apply: public void SayHi(this string name) => Console.WriteLine($"Hi { name }");
@bryanstewart90952 жыл бұрын
Hey Tim, Am I able to extend Form to add a property? I want Form to have a selectedItems property
@IAmTimCorey2 жыл бұрын
Yep. It is a class so you can treat it like any other class.
@holyshit9222 жыл бұрын
Complex numbers class from Numerics does not have any Parse method "Prototypes" of this Parse methods can be public static Complex Parse(string? ) public static bool TryParse(string? out Complex) Can this methods be written as extension methods
@IAmTimCorey2 жыл бұрын
Sure.
@ugursinansagroglu31323 жыл бұрын
It was really good. But all methods are void because of the logging operation doesn't need a return type.
@mehdi-vl5nn Жыл бұрын
Is mixing relevant in the world of C#? If so, can extension methods be used to achieve it?
@IAmTimCorey Жыл бұрын
I'm not sure what you mean by mixing.
@mehdi-vl5nn Жыл бұрын
@@IAmTimCorey it was a typo, mixin
@ronaldoperes12023 жыл бұрын
Hi Tim, How about the performance of an extension method? how can we measure it?
@RalfsBalodis3 жыл бұрын
You time it with a stopwatch.
@EduardoAG3 жыл бұрын
This is great, now I can create an extension for TextBox that tells me if the text is empty. textbox.isEmpty() looks better than string.IsNullOrEmpty(textbox.Text.Trim())
@tomthelestaff-iamtimcorey75973 жыл бұрын
Nice! Thanks for sharing it with us!
@stevojohn3 жыл бұрын
Use string.IsNullOrWhiteSpace
@miktin70083 жыл бұрын
Thanks Tim, are you able to put the link to the source code in the comments?
@IAmTimCorey3 жыл бұрын
It is in the description.
@stephan_smit3 жыл бұрын
Tim have you ever done something on Merge Conflicts in VS?
@tomthelestaff-iamtimcorey75973 жыл бұрын
Tim has a couple videos on VSCode which can be used to resolve issues like Merge Conflicts. I would post the links but KZfaq deletes the comment if I do. Video names are "Intro to VSCode for C# Developers - From Installation to Debugging" and "Real-time Collaboration with Live Share in Visual Studio and VSCode"
@mehdiabdallah67803 жыл бұрын
It seems like visitor design pattern
@laracarb3523 жыл бұрын
The way you speak in this video in particular feels faster than usual or it's just me?
@IAmTimCorey3 жыл бұрын
Not sure. I don't think I was rushing, but maybe I was.