It would be so interesting to see a "real world" scenario with interfaces of generic types being implemented, love this stuff
@IAmTimCorey11 ай бұрын
Watch any of my videos where I do data access to SQL. I use generics when working with Dapper to make things cleaner.
@austinmudadi917810 ай бұрын
Tim, the best as always. This is a masterpiece!
@IAmTimCorey10 ай бұрын
Thank you.
@neman1353 ай бұрын
Thank you very much Tim. I was really struggling to uderstand generics until I found this video. In general I adore the way you deliver knowledge, keep up the good work!
@IAmTimCorey3 ай бұрын
I am glad it was helpful.
@runtimmytimer11 ай бұрын
To date my experience, I was so happy when generics were added to c#. I came from c++ and it was frustrating not having a template equivalent.
@IAmTimCorey11 ай бұрын
Great!
@markleistner192410 ай бұрын
For sure. All the boxing and unboxing from object that used to be required. Still my favorite feature all these years later, if only so I don’t have to deal with boxing.
@leppyr6411 ай бұрын
Fantastic timing. I'm just trying to break down an existing Generic class to figure out how and why it's being used.
@IAmTimCorey11 ай бұрын
Excellent!
@efimov9010 ай бұрын
IAmTimCorey, this is very great video covering all the basics of generics. Unfortunately, I didn't learn anything new. I will definitely recommend it to my friends who don't understand this topic yet. Can you please make a video with more advanced things like and maybe Monad-like classes with embeded logic and conversion?
@IAmTimCorey10 ай бұрын
Thanks for the suggestion. Please add it to the list on the suggestion site so others can vote on it as well: suggestions.iamtimcorey.com/
@astralpowers11 ай бұрын
I love the trick in generics where you use constraint the type to the current class e.g. `BaseClass where T : BaseClass`. It looked weird at first, even now it is still weird, but is very useful so that the base class can get the type of the derived class. This mechanism is used in heavily in generic maths.
@runtimmytimer11 ай бұрын
It is useful. I used this in a data access layer with some LINQ. The constraint allows you to access properties of the base class in LINQ which can be very powerful.
@IAmTimCorey11 ай бұрын
Thanks for sharing!
@jackbunbury641711 ай бұрын
How can I learn more on this pattern? Does MS use it in any of its LINQ libraries? My Googling didn't turn up an examples. Can you point to a place to learn more?
@astralpowers11 ай бұрын
@@jackbunbury6417 the dark side to Roslyn is the pathway to many coding styles some consider to be unnatural
@atrave013 ай бұрын
Great video! Thank you Tim! Much appreciated for your time on this.
@IAmTimCorey3 ай бұрын
You are welcome.
@SagharMax11 ай бұрын
It was a complete explanation of using Generics in C#. Thank you so much.
@IAmTimCorey11 ай бұрын
You are welcome.
@mbpoblet8 ай бұрын
Not _completely_ complete... he didn't get into covariance and contravariance...
@michaelglockenmeier90610 ай бұрын
always a pleasure watching your videos while doing some cardio training like right now :-)
@IAmTimCorey10 ай бұрын
Great!
@acerreteq7038 ай бұрын
Hi Tim, thank you very much. Good explanations but i´m missing a lot of stuff. How to declare a method that returns a value of ? How to deal with type conversion inside a method if e.g. math operations lead to "can´t implicit convert from int to or vice versa. Definitely needs a part 2. 🖖
@vibes99200011 ай бұрын
Your last few mins of video were excellent, I somehow forgot the importance of `where`. Thanks a lot.
@IAmTimCorey10 ай бұрын
You are welcome!
@andywalter742610 ай бұрын
I actually had one case where I started out with interfaces but had to change to using generics that implemented the interface. The reason was sometimes whoever uses it needs to know the full type with all methods, not just what the interface used and worked out great.
@IAmTimCorey10 ай бұрын
Great!
@andergarcia111511 ай бұрын
Your knowledge is truly inspiring. The amount i gained from your video is incredible.
@IAmTimCorey11 ай бұрын
Thank you!
@MalcolmSwaine4 ай бұрын
Always spot on - nice use of C# features as well :)
@IAmTimCorey4 ай бұрын
Thank you!
@cemkaya44489 ай бұрын
Thanks for the video, great content as always! I tried it out for the efficiency problem of different types in list and got slightly different results than expected. Here are the times in milliseconds for adding elements: List elapsed time: 36 List elapsed time: 33 I didn't see as big a difference between the two lists as you did. Could Visual Studio Code or operation system be causing this difference?
@IAmTimCorey9 ай бұрын
I would check your code. There might be something different. You will always get different numbers from someone else because it is based upon the PC hardware. However, I don't believe they will be that close to each other. Not unless something else is different.
@cemkaya44489 ай бұрын
@@IAmTimCorey List numbers = [1, 2, 3, 4]; List objects = ["Tim", 4, 3.6]; // Count for objects. Stopwatch sw = new(); sw.Start(); for (int i = 0; i < 1_000_000; i++) { objects.Add(i); } sw.Stop(); WriteLine($"List elapsed time: {sw.ElapsedMilliseconds}"); // Count for numbers. Stopwatch sw1 = new(); sw1.Start(); for (int i = 0; i < 1_000_000; i++) { numbers.Add(i); } sw1.Stop(); WriteLine($"List elapsed time: {sw1.ElapsedMilliseconds}"); That's the code snippet, thanks. I might be missing something here. The current results are still showing a smaller difference than expected: --------------------------------------------- List elapsed time: 40 List elapsed time: 36 -------------------------------------------- If I use the stopwatch instance (sw) for the list of integers as you demonstrated, the difference actually increases in favor of the List. By the way, I'm using VS Code in M1 Mac Pro. If there is another way, I can share the picture of it.
@cemkaya44489 ай бұрын
Interesting! After running the test a few more times, I'm seeing some variability in the results: --------------------------------------------- List elapsed time: 36 List elapsed time: 18 -------------------------------------------- Looks like not consistent result. Anyway never mind me, Tim. I'm a person just trying to understand the logic. Thank you!
@bsdrago10 ай бұрын
Hey, great vdeo. But Id like to ask: Im using UNityENgine and my tests are the opposite: Both (int and objects) are slower in my computer and objects take less time than int (test in video in 9:00). Do you have any ideia why? Thnaks for this awesome video.
@IAmTimCorey10 ай бұрын
My guess is that there is some type of mismatch in your comparison. If you are converting an object to an int, that will take a non-zero amount of time. If you compare that to a method where you are not doing that conversion, the one where you are doing the conversion will be longer if the two are otherwise the same.
@bsdrago10 ай бұрын
@@IAmTimCorey The code is the same as the video, but I put it inside unity's Start() event. I'll still understand why the result is so different. Thanks.
@Dimitris.Christoforidis10 ай бұрын
Thank you Tim once again!! Very powerful videos, knowledge is the key in development! My question is can i pass Generics inside a controller for aspnet core?
@IAmTimCorey10 ай бұрын
You can use generics anywhere in C#. Now if you are asking if you can use a generic as an input parameter on a controller (something passed in from the user), I believe you technically can, but it can get messy in a hurry. I would recommend against it unless you have a really good reason.
@trudyreiser80755 ай бұрын
Very helpful! Thanks for doing what you do🙌🏻
@IAmTimCorey5 ай бұрын
You are welcome.
@gani748511 ай бұрын
Thanks its easy easy to understand. How can I limit different types for both T and U? Sampleclass where T:new() here How can I say U:int
@IAmTimCorey11 ай бұрын
public class SampleClass where T : new() where U : int { ... }
@hmihaela23107 ай бұрын
Extraordinary explanation!!
@IAmTimCorey7 ай бұрын
Thank you!
@vincenzoriwu299811 ай бұрын
Great Content Tim !
@IAmTimCorey11 ай бұрын
Thanks!
@bdowns7 ай бұрын
Thanks Mr. Corey
@IAmTimCorey7 ай бұрын
You are welcome.
@Me_Sam_Sepi0l11 ай бұрын
Thanks for your effort! :) Best Regards
@IAmTimCorey11 ай бұрын
You are welcome.
@begumyaprak75510 ай бұрын
Perfect explanation, thanks!
@IAmTimCorey10 ай бұрын
You are welcome.
@RiderInHell10 ай бұрын
Aside from what you mentioned about object type being more expensive than the generic T type, it might be worth mentioning that while the object type allows you to shove everything and anything into a list the generic T type allows only one. I know you mentioned this but it might not have been explicit to someone that's never dealt with generics before.
@IAmTimCorey10 ай бұрын
Thanks for sharing.
@bturner48411 ай бұрын
This really helps! I appreciate your channel
@IAmTimCorey11 ай бұрын
I'm so glad!
@Sanabalis10 ай бұрын
PersonRecord + PersonRecord might sometime produce MarriageRecord, or even ChildRecord (derived from PersonRecord), but most often they just produce an instance of PeopleRecord.
@laci-ht9cm11 ай бұрын
Hi Tim Corey! I am a new subscriber to your channel, thanks to this video about Generics. Sorry if this question is repetitive, but I was unable to find how can I configurate Visual Strudio 2022 to colorize the code like this. Do you have a video for it?
@IAmTimCorey10 ай бұрын
Here is a video on how to turn on colorized braces: kzbin.info/www/bejne/hWKqhpWglsidgbMsi=J4HQhYP2sWZPejuD
@BertONeill9 ай бұрын
Excellent tutorial
@IAmTimCorey9 ай бұрын
Thank you!
@abhigupta319310 ай бұрын
thanks, I learn lots of things for generics
@IAmTimCorey10 ай бұрын
I am glad it was helpful.
@mohammedbadran784011 ай бұрын
Thanks a lot for your efforts , great topic
@IAmTimCorey11 ай бұрын
You are welcome.
@jeffsherman963811 ай бұрын
Would you say that the most common usage of generics would be if multiple types need to be used?
@IAmTimCorey11 ай бұрын
The most common use of generics is in list-types (List, IEnumerable, etc.) and those are mostly single types. Beyond that, I'm not sure I see a standout. For instance, when I do my data access with Dapper, I do one method with two types, one with one.
@jeffsherman963811 ай бұрын
@@IAmTimCorey I guess I don’t see any advantage if it’s still declared as a single data type
@IAmTimCorey11 ай бұрын
Sorry, I think we might be talking about different things. I am talking about having one generic type as opposed to two . If you are asking if people typically put more than one type (such as PersonModel, UserModel, and EmployeeModel) into then yes, kind of. Once you declare such as List, you can only use that type for T. However, you can also have a List separately that you use. The benefit of being generic is that you can reuse the same code for working with Lists, but work with any type in a type-safe manner. Does that better answer your question?
@jeffsherman963811 ай бұрын
@@IAmTimCorey I think so. I just need to see more use cases and to see if it is a popular option in software development
@hjoseph7776 ай бұрын
Hey Tim, can you explain the concept high otherwise it is straight coding.
@IAmTimCorey6 ай бұрын
I'm not sure what you are asking for. Are you asking for a high-level explanation?
@catalinmarianmursa789211 ай бұрын
Thank you!
@IAmTimCorey11 ай бұрын
You are welcome.
@ademineshat11 ай бұрын
Thanks. Is there any .net maui content coming in the future?
@IAmTimCorey11 ай бұрын
Not in the near future (next few months). I would like to, but it is going to take some doing to get deep into it. Covering mobile in general takes a LOT of content, since it is such a complicated subject. It is high on my priority list, though.
@kylekeenan348511 ай бұрын
Oh lovely that would be great!
@harrygarala411910 ай бұрын
I love the trick in generics
@IAmTimCorey10 ай бұрын
Great!
@MyReviews_karkan9 ай бұрын
Could you please have chapters in your videos? Sometimes I want to skip. A subject that I know, but then find out there is no chapter. Thank you
@IAmTimCorey9 ай бұрын
That comes down to time. I don't have the time to add them in, and right now neither does my team. So, we rely on people in the community to help us out with those.
@Aliabdullah-o9r3 ай бұрын
great video give A to Z abouth generic 😇
@IAmTimCorey3 ай бұрын
Thank you!
@jerrybodensky967911 ай бұрын
I listened to the video while I was doing the dishes. When I heard about "meth operations", my first thought was: How can something like that be legal in C#? Just kidding.... An usefull concept explained clearly! Thanks!
@IAmTimCorey11 ай бұрын
😂 Haven't you heard of the Breaking Bad C# channel? Although, that does sound like a good concept: breaking bad C# habits and code patterns one video at a time.
@jeffreyelkins318310 ай бұрын
I prefer my list of Coffee not T
@IAmTimCorey10 ай бұрын
👍🏻
@MrMichalXXL5 ай бұрын
You can'tbe serious that as an example you give type checker string with string parameter...I know it's only an example but cmon
@IAmTimCorey5 ай бұрын
First, you just answered your own statement - this is a demo. The point isn't to give you a code snippet that you would drop into your code. The point is to give you a clear demo that doesn't add confusion to the viewer. Building demos that will effectively communicate is nothing like building production code. If I built production code, it would obscure the lesson enough that it would not be understood. That's when you see demos where you have dozens of prerequisites in order to understand even a simple topic. The key is to eliminate as many assumptions and prerequisites as possible. Second, the point wasn't to create a method that checked the type. The point was to visually show off that different types could be used with our generic and that they would be treated like that type inside of the method. That was the purpose of using a type checker. Third, did you watch the whole video? I demonstrated a generic method (that's what you are talking about here) that displayed the type it was storing so that the user could see the types were different. Then I demonstrated a generic class where we built a better list (one that reported what went into it when something was added). Then we demonstrated a generic class with restrictions on the type of generic being passed in so that we could add numbers even if we didn't know what type of numeric type it was. At the end of the video, I also gave additional uses for generics (Lists, logging, etc.)
@waynehawkins65411 ай бұрын
Nice video but you lost me a bit. Be good you dig deeper into this topic.
@IAmTimCorey10 ай бұрын
Have you practiced it? Sometimes it clicks when you do it yourself.