Visual C++ .NET/Collections/Dictionary — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
|
(нет различий)
| |
Версия 15:31, 26 мая 2010
Содержание
- 1 Adding value pair to a dictionary
- 2 Adding value to a dictionary with indexer
- 3 Create SortedDictionary from a Dictionary
- 4 Does a Dictionary contain a certain key
- 5 Get Key Collection Enumerator and Value Collection Enumerator
- 6 Get KeyValuePair from Dictionary
- 7 Get value by Dictionary indexer
- 8 Get values from a Dictionary
- 9 Pass Dictionary to a function
- 10 The add method of dictionary takes the key and the value
- 11 The remove method of dictionary takes the key as an argument
- 12 Using for each to loop through a dictionary
Adding value pair to a dictionary
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
}
Adding value to a dictionary with indexer
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
}
Create SortedDictionary from a Dictionary
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
ref class Reverse : public IComparer<int>{
public:
virtual int Compare(int x, int y) { return y - x; }
virtual bool Equals(int x, int y) { return x == y; }
virtual int GetHashCode(int obj) { return obj.GetHashCode(); }
};
void SortedDictionaryExample(Dictionary<int,String^>^ inDict)
{
SortedDictionary<int,String^>^ dict = gcnew SortedDictionary<int,String^>(inDict, gcnew Reverse());
dict->Add(6, "Six");
String^ t = dict[3];
Console::WriteLine("dict[3] = {0}\n", t);
}
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
SortedDictionaryExample(dict);
}
Does a Dictionary contain a certain key
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
Console::WriteLine("\nDictionary contains 6? [{0}]", dict->ContainsKey(6));
}
Get Key Collection Enumerator and Value Collection Enumerator
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
Dictionary<int,String^>::KeyCollection::Enumerator ^key = dict->Keys->GetEnumerator();
Dictionary<int,String^>::ValueCollection::Enumerator ^value = dict->Values->GetEnumerator();
while ( key->MoveNext() && value->MoveNext()){
Console::WriteLine("Key = [{0}]\tValue = [{1}]", key->Current, value->Current);
}
}
Get KeyValuePair from Dictionary
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
for each (KeyValuePair<int,String^>^ pair in dict)
{
Console::WriteLine("Key = [{0}]\tValue = [{1}]",
pair->Key, pair->Value);
}
}
Get value by Dictionary indexer
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
String^ t = dict[3];
Console::WriteLine("dict[3] = {0}\n", t);
}
Get values from a Dictionary
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
ref class Reverse : public IComparer<int>{
public:
virtual int Compare(int x, int y) { return y - x; }
virtual bool Equals(int x, int y) { return x == y; }
virtual int GetHashCode(int obj) { return obj.GetHashCode(); }
};
void SortedDictionaryExample(Dictionary<int,String^>^ inDict)
{
SortedDictionary<int,String^>^ dict = gcnew SortedDictionary<int,String^>(inDict, gcnew Reverse());
dict->Add(6, "Six");
String^ t = dict[3];
Console::WriteLine("dict[3] = {0}\n", t);
Console::WriteLine("Sorted Values:");
for each (String ^s in dict->Values)
Console::WriteLine("\t{0}",s);
}
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
SortedDictionaryExample(dict);
}
Pass Dictionary to a function
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
ref class Reverse : public IComparer<int>{
public:
virtual int Compare(int x, int y) { return y - x; }
virtual bool Equals(int x, int y) { return x == y; }
virtual int GetHashCode(int obj) { return obj.GetHashCode(); }
};
void SortedDictionaryExample(Dictionary<int,String^>^ inDict)
{
SortedDictionary<int,String^>^ dict = gcnew SortedDictionary<int,String^>(inDict, gcnew Reverse());
dict->Add(6, "Six");
String^ t = dict[3];
Console::WriteLine("dict[3] = {0}\n", t);
}
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
SortedDictionaryExample(dict);
}
The add method of dictionary takes the key and the value
#include "stdafx.h"
using namespace System;
using namespace System::Collections::Generic;
int main()
{
IDictionary<String^, String^>^ dict;
dict = gcnew Dictionary<String^, String^>();
dict->Add("a", "A");
dict->Add("o", "B");
dict->Add("i", "C");
for each (KeyValuePair<String^, String^>^ pair in dict)
{
Console::WriteLine(" {0}: {1}", pair->Key, pair->Value);
}
dict->Remove("hat");
for each (KeyValuePair<String^, String^>^ pair in dict)
{
Console::WriteLine(" {0}: {1}", pair->Key, pair->Value);
}
}
The remove method of dictionary takes the key as an argument
#include "stdafx.h"
using namespace System;
using namespace System::Collections::Generic;
int main()
{
IDictionary<String^, String^>^ dict;
dict = gcnew Dictionary<String^, String^>();
dict->Add("a", "A");
dict->Add("o", "B");
dict->Add("i", "C");
for each (KeyValuePair<String^, String^>^ pair in dict)
{
Console::WriteLine(" {0}: {1}", pair->Key, pair->Value);
}
dict->Remove("hat");
for each (KeyValuePair<String^, String^>^ pair in dict)
{
Console::WriteLine(" {0}: {1}", pair->Key, pair->Value);
}
}
Using for each to loop through a dictionary
#include "stdafx.h"
#using <system.dll>
using namespace System;
using namespace System::Collections::Generic;
void main()
{
Dictionary<int,String^>^ dict = gcnew Dictionary<int,String^>();
dict->Add(1, "One");
dict->Add(6, "Six");
dict->Add(5, "Five");
dict->Add(3, "3");
dict[3] = "Three";
dict[7] = "Seven";
for each (KeyValuePair<int,String^>^ pair in dict)
{
Console::WriteLine("Key = [{0}]\tValue = [{1}]", pair->Key, pair->Value);
}
}