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NameObjectCollectionBase.BaseGetAllKeys Method
Visual Studio 2010
Returns a String array that contains all the keys in the NameObjectCollectionBase instance.
Assembly: System (in System.dll)
Return Value
Type: 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; using System.Collections; using System.Collections.Specialized; public class MyCollection : NameObjectCollectionBase { private DictionaryEntry _de = new DictionaryEntry(); // Gets a key-and-value pair (DictionaryEntry) using an index. public DictionaryEntry this[ int index ] { get { _de.Key = this.BaseGetKey( index ); _de.Value = this.BaseGet( index ); return( _de ); } } // Adds elements from an IDictionary into the new collection. public MyCollection( IDictionary d ) { foreach ( DictionaryEntry de in d ) { this.BaseAdd( (String) de.Key, de.Value ); } } // Gets a String array that contains all the keys in the collection. public String[] AllKeys { get { return( this.BaseGetAllKeys() ); } } // Gets an Object array that contains all the values in the collection. public Array AllValues { get { return( this.BaseGetAllValues() ); } } // Gets a String array that contains all the values in the collection. public String[] AllStringValues { get { return( (String[]) this.BaseGetAllValues( typeof(System.String) ) ); } } } public class SamplesNameObjectCollectionBase { public static void Main() { // Creates and initializes a new MyCollection instance. IDictionary d = new ListDictionary(); d.Add( "red", "apple" ); d.Add( "yellow", "banana" ); d.Add( "green", "pear" ); MyCollection myCol = new 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:" ); foreach ( String s in myCol.AllKeys ) { Console.WriteLine( " {0}", s ); } // Displays the list of values of type Object. Console.WriteLine( "The list of values (Object):" ); foreach ( 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):" ); foreach ( 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 ); } } } /* 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 */
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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