61 lines
1.3 KiB
Markdown
61 lines
1.3 KiB
Markdown
<center><img src="https://i.imgur.com/UWw1g20.png" /></center>
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## System Collections
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We have 3 collections namespace in C#
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- System.Collections
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- Store items as Object
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- ArrayList
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- Queue
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- Stack
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- Hashtable
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- System.Collections.Generic
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- Using Generics to specify one data type
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- List
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- Queue
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- Stack
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- Dictionary<TKey,TValue>
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- System.Collections.Concurrent
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- As previous bu thread safe
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## Live coding - List
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```csharp
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namespace Lecture;
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public static class Program {
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public static void Main() {
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var myList = new List<int>();
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myList.Add(12);
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myList.Add(23);
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myList.Add(122);
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myList.Add(312);
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myList.Add(142);
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myList[4] = 1;
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int a = myList[5];
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Console.WriteLine($"{myList}"); // Will return the type of the list and the value
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Console.WriteLine(a); // Will return the value a (myList[5])
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foreach (var element in myList) {
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Console.WriteLine($"{element}");
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} // Will display each element of the list
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myList.ForEach(x => Console.WriteLine($"{x}")); // Same thing that foreach bellow
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var t = myList.GetRange(3, 2);
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t.ForEach(x => Console.WriteLine($"{x}"));
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myList.sort();
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myList.
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}
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}
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```
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## Live coding - Dictionary
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```csharp
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namespace Lecture;
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public static class Program {
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public static void Main() {
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var dict = Dictionary<
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}
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}
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``` |