C++ Windows Forms L07 - Collections of C++ Windows Forms Light Course

1. C++.NET
Windows Forms Course
L07 –Collections
Mohammad Shaker
mohammadshakergtr.wordpress.com
C++.NET Windows Forms Course
@ZGTRShaker

2. Welcome!

3. Collections?

4. Collections Generic
generic?

5. Class
Comparer<T>
Description
Provides a base class for implementations of
the IComparer<T>generic interface.
Dictionary<TKey, TValue>
Dictionary<TKey,
TValue>::KeyCollection
Dictionary<TKey,
TValue>::ValueCollection
EqualityComparer<T>
Represents a collection of keys and values.
Represents the collection of keys in a Dictionary<TKey,
TValue>. This class cannot be inherited.
HashSet<T>
KeyedByTypeCollection<TItem>
KeyNotFoundException
Represents a set of values.
Provides a collection whose items are types that serve as keys.
The exception that is thrown when the key specified for
accessing an element in a collection does not match any key in
the collection.
LinkedList<T>
LinkedListNode<T>
Represents a doubly linked list.
Represents a node in a LinkedList<T>. This class cannot be
inherited.
List<T>
Represents a strongly typed list of objects that can be
accessed by index. Provides methods to search, sort, and
manipulate lists.
Represents a first-in, first-out collection of objects.
Queue<T>
Represents the collection of values in a Dictionary<TKey,
TValue>. This class cannot be inherited.
Provides a base class for implementations of
theIEqualityComparer<T> generic interface.

6. SortedDictionary<TKey, TValue>
Represents a collection of key/value pairs that are sorted on
the key.
SortedDictionary<TKey,
TValue>::KeyCollection
Represents the collection of keys in a SortedDictionary<TKey,
TValue>. This class cannot be inherited.
SortedDictionary<TKey,
TValue>::ValueCollection
Represents the collection of values in
a SortedDictionary<TKey, TValue>. This class cannot be
inherited
SortedList<TKey, TValue>
Represents a collection of key/value pairs that are sorted by
key based on the associated IComparer<T> implementation.
SortedSet<T>
Represents a collection of objects that is maintained in sorted
order.
Represents a variable size last-in-first-out (LIFO) collection of
instances of the same arbitrary type.
Stack<T>
SynchronizedCollection<T>
Provides a thread-safe collection that contains objects of a
type specified by the generic parameter as elements.
SynchronizedKeyedCollection<K, T>
Provides a thread-safe collection that contains objects of a
type specified by a generic parameter and that are grouped by
keys.
SynchronizedReadOnlyCollection<T>
Provides a thread-safe, read-only collection that contains
objects of a type specified by the generic parameter as
elements.

7. Peak on Collections
private : System::Collections::Generic::LinkedList <String ^> ^MyStrList ;
private : System::Collections::Generic::List<TextBox ^> ^List ;
private : System::Collections::Generic::Stack <String ^> ^ MyStack;
private : System::Collections::ArrayList ^MyArrayList ;

8. Peak on Collections
private : System::Collections::Generic::Stack < String ^> ^MyStack;
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e)
{
MyStack = gcnew System::Collections::Generic::Stack < String ^>;
}

9. Peak on Collections
• Let’s have the following!
private : System::Collections::Generic::LinkedList <Button^> ^MyList;
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e)
{
MyList = gcnew System::Collections::Generic:: LinkedList <Button ^>;
}

11. Peak on Collections
private : System::Collections::Generic::LinkedList < String ^> ^MyList;
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^
e)
{
MyList = gcnew System::Collections::Generic::LinkedList < String ^>;
}
private: System::Void button1_Click_1(System::Object^
System::EventArgs^ e)
{
MyList->AddLast(“MeMe");
MyList->AddLast(“MeMa");
}
sender,

12. Peak on Collections
• What’s wrong?
private : System::Collections::Generic::LinkedList < String ^> ^MyList;
private: System::Void button1_Click_1(System::Object^
System::EventArgs^ e)
{
MyList->AddLast(“MeMe");
MyList->AddLast(“MeMa");
}
Runtime error. the LinkedList is still NULL
sender,

13. Peak on Collections
• “for each” loop
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
for each (String ^str in MyList)
{
textBox1->Text += str + Environment::NewLine ;
}
}

14. private : System::Collections::Generic::LinkedList < String ^> ^MyList;
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^
e)
{
MyList = gcnew System::Collections::Generic::LinkedList < String ^>;
}
private: System::Void button1_Click_1(System::Object^
System::EventArgs^ e)
{
MyList->AddLast(textBox1->Text);
}
sender,
private: System::Void button1_Click_2(System::Object^ sender,
System::EventArgs^ e)
{
for each (String ^str in MyList)
{
textBox1->Text += str + Environment::NewLine ;
}
}

15. private : System::Collections::Generic::LinkedList < Button^> ^MyList;
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^
e)
{
MyList = gcnew System::Collections::Generic::LinkedList < Button ^>;
}
private: System::Void button1_Click_1(System::Object^
System::EventArgs^ e)
{
Button ^B1 = gcnew Button ;
MyList->AddLast(B1);
}
sender,
private: System::Void button1_Click_2(System::Object^ sender,
System::EventArgs^ e)
{
static int Counter = 1 ;
for each (Button ^B in MyList)
{
B->Text = “Button” + Counter.ToString();
B->Height = 30 ; B->Width = 50 ;
Counter++ ;
}
}

16. Peak on Collections
• Needs to be static?
private: System::Void button1_Click_2(System::Object^ sender,
System::EventArgs^ e)
{
int Counter = 1 ;
for each (Button ^B in MyList)
{
B->Text = “Button” + Counter.ToString();
B->Height = 30 ; B->Width = 50 ;
Counter++ ;
}
}

17. Peak on Collections - List
private: System::Collections::Generic::List<String^> ^MyList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyList = gcnew
System::Collections::Generic::List<String^> (4) ;
MyList->Add("Z") ;
MyList->Add("G") ;
MyList->Add("T") ;
MyList->Add("R") ;
}
private: System::Void button1_Click_1(System::Object^
sender, System::EventArgs^ e)
{
for each (String ^str in MyList)
{
textBox1->Text += str + " " ;
}
}

18. List

19. List
private: System::Collections::Generic::List<String^> ^MyList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyList = gcnew System::Collections::Generic::List<String^> (4) ;
MyList->Add("Z") ;
MyList->Add("G") ;
MyList->Add("T") ;
MyList->Add("R") ;
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
for(int i=0; i<4 ; i++)
{
textBox1->Text += MyList[i] + " ";
}
}

20. List

21. List
private: System::Collections::Generic::List<String^> ^MyList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyList = gcnew
System::Collections::Generic::List<String^> (4) ;
MyList[0] = “Z” ;
MyList[1] = “G” ;
MyList[2] = “T” ;
MyList[3] = “R” ;
}
private: System::Void button1_Click_1(System::Object^
sender, System::EventArgs^ e)
{
for(int i=0; i<4 ; i++)
{
textBox1->Text += MyList[i] + " ";
}
}

22. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
// Not initialized
String ^S = "ZGTR";
int i ;
// Not initialized
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
Everything is good

23. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
MyArrayList[0] = B2 ;
MyArrayList[3] = 6 ;
}
Everything is good

24. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
MyArrayList[0] = B2 ;
MyArrayList[3] = B2 ; // Here!
}
Everything is good

25. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
MyArrayList[0] = 6;
// Here!
MyArrayList[3] = B2 ; // Here!
}
Everything is good

26. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
B1->Height = 50 ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
MyArrayList[0] = B2 ;
MyArrayList[3] = 6 ;
}
Compiler error. No new for Button1

27. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
B1->Height = 50 ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
MyArrayList[0] = B2 ;
MyArrayList[3] = 6 ;
}
Everything is good

28. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
B1->Height = 50 ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
MyArrayList[0] = B2 ;
MyArrayList[4] = 6 ;
}
Compiler error. index = 4! Wrong!

29. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1,^B2= gcnew Button ;
B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
B1->Height = 50 ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
B2 = MyArrayList[0] ; // 1
MyArrayList[3] = 6 ;
}
Compiler error. object^ and Button^ in 1

30. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
Everything is good

31. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
private: System::Void button1_Click_1(System::Object^
System::EventArgs^ e)
{
textBox1->Text =MyArrayList[0] ->Height ;
}
Compile error
sender,

32. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
textBox1->Text =(MyArrayList[0]->Height)->ToString() ;
}
Compile error

33. Peak on Collections – ArrayList
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
textBox1->Text =(MyArrayList[0]->Height).ToString() ;
}
Compile error

34. ArrayList - dynamic_cast
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
textBox1->Text =((dynamic_cast <Button^>(MyArrayList[0]))->Height).ToString();
}
Everything is good. And will print 23. but why?

35. ArrayList - dynamic_cast
private: System::Collections::ArrayList ^MyArrayList ;
private: System::Void Form1_Load(System::Object^ sender,
System::EventArgs^ e)
{
MyArrayList = gcnew System::Collections::ArrayList (4) ;
static int Counter = 0 ;
Button ^B1 = gcnew Button ;
TextBox ^T1 ;
String ^S = "ZGTR";
int i ;
B1->Height = 30 ;
MyArrayList->Add(B1) ;
MyArrayList->Add(T1) ;
MyArrayList->Add(S) ;
MyArrayList->Add(i) ;
}
private: System::Void button1_Click_1(System::Object^ sender,
System::EventArgs^ e)
{
textBox1->Text =((dynamic_cast <Button^>(MyArrayList[0]))->Height).ToString();
}
Everything is good. And will print 30.

36. ArrayList
• It’s not a Generic*
– private: System::Collections::ArrayList ^MyArrayList ;
• Drop in performance!
_____________________________________________________
*Generic : class Typed

37. Enough said,
let’s dig deep live

38. That’s it for today!