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How do I do to improve my coding ability with VS2019 C# + winform.

 2 years ago
source link: https://www.codeproject.com/Questions/5317013/How-do-I-do-to-improve-my-coding-ability-with-VS20
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Example :
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Input Two Any Value With Int Type, Call Them 'A', 'B'.
User Can Input A Positive Value For How Many Times The System Creates A Random Number 'M' , A <= M < B.
The System Will Create Random Number 'M' Between 'A' And 'B'.
The Winform Calculates Random Number's Result And Show Them Out.

Hi All, I Create A Bad Coding. Although It Can Work, But The Processing System Struct Was Horrible.
How Do I Do To Improve My Coding Ability. If Anyone Can Help And Give Me Some Suggestions Or Through Direction.
I Need To Fix My Code To More Clean, Readability.How I Start My Coding Let The Winform Become More Completely. Thanks Guys.

GitHub - worldpeaceend/RandomNumber: input two any value with int type, call them a, b.[^]

What I have tried:
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The Exam Need To Use List<List<int>>, And Dictionary<int, int> To Finish. I Can Not Totally UnderStand How To Use 'Key' And 'Value' Of List And Dictionary.
At First, I Try To Use Array To Finish The System Function.
But The Winform Become More And More Terrible.
Comments
Why do you need a Dictionary? Create a simple List<int> to hold the random numbers as you generate them. You can then use that list to populate a ListBox on your form to display all the generated values.
Quote:

I Can Not Totally UnderStand How To Use 'Key' And 'Value' Of List And Dictionary.

Lists don't have "Key" or "Value" - dictionaries do because they store two bits of information: a Key which must be unique and a Value which is associated with that key.
For example, a Dictionary<int, Product> might use the ProductID as the Key and the Product itself as the Value: then you use it by supplying the ID Key and acess the Product from that:
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string desc = products[prodID].Description;
int stockLevl = products[prodID].InStock;
A List doesn't do that: it just stores the Products and allows you to access them by index:
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for (int i = 0; i < products.Count; i++)
   {
   Console.WriteLine($"{products[i].Description}: {products[i].Instock}");
   }


To be honest, if you don't understand the difference between a Dictionary and a List, then that probably explains why your code is low quality - you need to learn the basics and get them down pretty solidly before you start coding complicated apps.

We can't tell you how to improve code we haven't looked at - and I'm certainly not bouncing off to GitHub to look through a whole app to work out what you did so badly - so I'll just say it again: learn the basics well. Until they are instinctive, you can't build good code on top of them.

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