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NameObjectCollectionBase::BaseGetAllKeys Method ()
.NET Framework (current version)
Returns a String array that contains all the keys in the NameObjectCollectionBase instance.
Assembly: System (in System.dll)
Return Value
Type: array<System::String^>^A String array that contains all the keys in the NameObjectCollectionBase instance.
The following code example uses BaseGetAllKeys and BaseGetAllValues to get an array of the keys or an array of the values.
#using <System.dll> using namespace System; using namespace System::Collections; using namespace System::Collections::Specialized; public ref class MyCollection : public NameObjectCollectionBase { private: DictionaryEntry^ _de; // Gets a key-and-value pair (DictionaryEntry) using an index. public: property DictionaryEntry^ default[ int ] { DictionaryEntry^ get(int index) { _de->Key = this->BaseGetKey( index ); _de->Value = this->BaseGet( index ); return( _de ); } } // Adds elements from an IDictionary into the new collection. MyCollection( IDictionary^ d ) { _de = gcnew DictionaryEntry(); for each ( DictionaryEntry^ de in d ) { this->BaseAdd( (String^) de->Key, de->Value ); } } // Gets a String array that contains all the keys in the collection. property array<String^>^ AllKeys { array<String^>^ get() { return( this->BaseGetAllKeys() ); } } // Gets an Object array that contains all the values in the collection. property Array^ AllValues { Array^ get() { return( this->BaseGetAllValues() ); } } // Gets a String array that contains all the values in the collection. property array<String^>^ AllStringValues { array<String^>^ get() { return( (array<String^>^) this->BaseGetAllValues( System::String::typeid ) ); } } }; public ref class SamplesNameObjectCollectionBase { public: static void Main() { // Creates and initializes a new MyCollection instance. IDictionary^ d = gcnew ListDictionary(); d->Add( "red", "apple" ); d->Add( "yellow", "banana" ); d->Add( "green", "pear" ); MyCollection^ myCol = gcnew MyCollection( d ); Console::WriteLine( "Initial state of the collection (Count = {0}):", myCol->Count ); PrintKeysAndValues( myCol ); // Displays the list of keys. Console::WriteLine( "The list of keys:" ); for each ( String^ s in myCol->AllKeys ) { Console::WriteLine( " {0}", s ); } // Displays the list of values of type Object. Console::WriteLine( "The list of values (Object):" ); for each ( Object^ o in myCol->AllValues ) { Console::WriteLine( " {0}", o->ToString() ); } // Displays the list of values of type String. Console::WriteLine( "The list of values (String):" ); for each ( String^ s in myCol->AllValues ) { Console::WriteLine( " {0}", s ); } } public: static void PrintKeysAndValues( MyCollection^ myCol ) { for ( int i = 0; i < myCol->Count; i++ ) { Console::WriteLine( "[{0}] : {1}, {2}", i, myCol[i]->Key, myCol[i]->Value ); } } }; int main() { SamplesNameObjectCollectionBase::Main(); } /* This code produces the following output. Initial state of the collection (Count = 3): [0] : red, apple [1] : yellow, banana [2] : green, pear The list of keys: red yellow green The list of values (Object): apple banana pear The list of values (String): apple banana pear */
Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Available since 10
.NET Framework
Available since 1.1
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