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NameObjectCollectionBase.BaseAdd Method
.NET Framework 1.1
Adds an entry with the specified key and value into the NameObjectCollectionBase instance.
[Visual Basic] Protected Sub BaseAdd( _ ByVal name As String, _ ByVal value As Object _ ) [C#] protected void BaseAdd( string name, object value ); [C++] protected: void BaseAdd( String* name, Object* value ); [JScript] protected function BaseAdd( name : String, value : Object );
Parameters
- name
- The String key of the entry to add. The key can be a null reference (Nothing in Visual Basic).
- value
- The Object value of the entry to add. The value can be a null reference (Nothing in Visual Basic).
Exceptions
| Exception Type | Condition |
|---|---|
| NotSupportedException | The collection is read-only. |
Example
[Visual Basic, C#, C++] The following code example uses BaseAdd to create a new NameObjectCollectionBase with elements from an IDictionary.
[Visual Basic] Imports System Imports System.Collections Imports System.Collections.Specialized Public Class MyCollection Inherits NameObjectCollectionBase Private _de As New DictionaryEntry() ' Gets a key-and-value pair (DictionaryEntry) using an index. Default Public ReadOnly Property Item(index As Integer) As DictionaryEntry Get _de.Key = Me.BaseGetKey(index) _de.Value = Me.BaseGet(index) Return _de End Get End Property ' Adds elements from an IDictionary into the new collection. Public Sub New(d As IDictionary) Dim de As DictionaryEntry For Each de In d Me.BaseAdd(CType(de.Key, [String]), de.Value) Next de End Sub 'New End Class 'MyCollection Public Class SamplesNameObjectCollectionBase Public Shared Sub Main() ' Creates and initializes a new MyCollection instance. Dim d = New ListDictionary() d.Add("red", "apple") d.Add("yellow", "banana") d.Add("green", "pear") Dim myCol As New MyCollection(d) ' Displays the keys and values of the MyCollection instance. Dim i As Integer For i = 0 To myCol.Count - 1 Console.WriteLine("[{0}] : {1}, {2}", i, myCol(i).Key, myCol(i).Value) Next i End Sub 'Main End Class 'SamplesNameObjectCollectionBase 'This code produces the following output. ' '[0] : red, apple '[1] : yellow, banana '[2] : green, pear [C#] 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 ); } } } 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 ); // Displays the keys and values of the MyCollection instance. 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. [0] : red, apple [1] : yellow, banana [2] : green, pear */ [C++] #using <mscorlib.dll> #using <system.dll> using namespace System; using namespace System::Collections; using namespace System::Collections::Specialized; public __gc class MyCollection : public NameObjectCollectionBase { private: DictionaryEntry _de; // Gets a key-and-value pair (DictionaryEntry) using an index. public: __property DictionaryEntry get_Item( 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) { IEnumerator* myEnum = d->GetEnumerator(); while (myEnum->MoveNext()) { DictionaryEntry* de = __try_cast<DictionaryEntry*>(myEnum->Current); this->BaseAdd(__try_cast<String*>(de->Key), de->Value); } } }; int main() { // Creates and initializes a new MyCollection instance. IDictionary* d = new ListDictionary(); d->Add(S"red", S"apple"); d->Add(S"yellow", S"banana"); d->Add(S"green", S"pear"); MyCollection* myCol = new MyCollection(d); // Displays the keys and values of the MyCollection instance. for (int i = 0; i < myCol->Count; i++) { Console::WriteLine(S"[{0}] : {1}, {2}", __box(i), myCol->Item[i].Key, myCol->Item[i].Value); } } /* This code produces the following output. [0] : red, apple [1] : yellow, banana [2] : green, pear */
[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button
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Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework
See Also
NameObjectCollectionBase Class | NameObjectCollectionBase Members | System.Collections.Specialized Namespace
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