ArrayList::IsFixedSize Property
Gets a value indicating whether the ArrayList has a fixed size.
Assembly: mscorlib (in mscorlib.dll)
Property Value
Type: System::Booleantrue if the ArrayList has a fixed size; otherwise, false. The default is false.
Implements
IList::IsFixedSizeA collection with a fixed size does not allow the addition or removal of elements after the collection is created, but it allows the modification of existing elements.
A collection with a fixed size is simply a collection with a wrapper that prevents adding and removing elements; therefore, if changes are made to the underlying collection, including the addition or removal of elements, the fixed-size collection reflects those changes.
Retrieving the value of this property is an O(1) operation.
The following code example shows how to create a fixed-size wrapper around an ArrayList.
using namespace System; using namespace System::Collections; void PrintValues( IEnumerable^ myList, char mySeparator ); int main() { // Creates and initializes a new ArrayList. ArrayList^ myAL = gcnew ArrayList; myAL->Add( "The" ); myAL->Add( "quick" ); myAL->Add( "brown" ); myAL->Add( "fox" ); myAL->Add( "jumped" ); myAL->Add( "over" ); myAL->Add( "the" ); myAL->Add( "lazy" ); myAL->Add( "dog" ); // Create a fixed-size wrapper around the ArrayList. ArrayList^ myFixedSizeAL = ArrayList::FixedSize( myAL ); // Display whether the ArrayLists have a fixed size or not. Console::WriteLine( "myAL {0}.", myAL->IsFixedSize ? (String^)"has a fixed size" : "does not have a fixed size" ); Console::WriteLine( "myFixedSizeAL {0}.", myFixedSizeAL->IsFixedSize ? (String^)"has a fixed size" : "does not have a fixed size" ); Console::WriteLine(); // Display both ArrayLists. Console::WriteLine( "Initially," ); Console::Write( "Standard :" ); PrintValues( myAL, ' ' ); Console::Write( "Fixed size:" ); PrintValues( myFixedSizeAL, ' ' ); // Sort is allowed in the fixed-size ArrayList. myFixedSizeAL->Sort(); // Display both ArrayLists. Console::WriteLine( "After Sort," ); Console::Write( "Standard :" ); PrintValues( myAL, ' ' ); Console::Write( "Fixed size:" ); PrintValues( myFixedSizeAL, ' ' ); // Reverse is allowed in the fixed-size ArrayList. myFixedSizeAL->Reverse(); // Display both ArrayLists. Console::WriteLine( "After Reverse," ); Console::Write( "Standard :" ); PrintValues( myAL, ' ' ); Console::Write( "Fixed size:" ); PrintValues( myFixedSizeAL, ' ' ); // Add an element to the standard ArrayList. myAL->Add( "AddMe" ); // Display both ArrayLists. Console::WriteLine( "After adding to the standard ArrayList," ); Console::Write( "Standard :" ); PrintValues( myAL, ' ' ); Console::Write( "Fixed size:" ); PrintValues( myFixedSizeAL, ' ' ); Console::WriteLine(); // Adding or inserting elements to the fixed-size ArrayList throws an exception. try { myFixedSizeAL->Add( "AddMe2" ); } catch ( Exception^ myException ) { Console::WriteLine( "Exception: {0}", myException ); } try { myFixedSizeAL->Insert( 3, "InsertMe" ); } catch ( Exception^ myException ) { Console::WriteLine( "Exception: {0}", myException ); } } void PrintValues( IEnumerable^ myList, char mySeparator ) { IEnumerator^ myEnum = myList->GetEnumerator(); while ( myEnum->MoveNext() ) { Object^ obj = safe_cast<Object^>(myEnum->Current); Console::Write( "{0}{1}", mySeparator, obj ); } Console::WriteLine(); } /* This code produces the following output. myAL does not have a fixed size. myFixedSizeAL has a fixed size. Initially, Standard : The quick brown fox jumped over the lazy dog Fixed size: The quick brown fox jumped over the lazy dog After Sort, Standard : brown dog fox jumped lazy over quick the The Fixed size: brown dog fox jumped lazy over quick the The After Reverse, Standard : The the quick over lazy jumped fox dog brown Fixed size: The the quick over lazy jumped fox dog brown After adding to the standard ArrayList, Standard : The the quick over lazy jumped fox dog brown AddMe Fixed size: The the quick over lazy jumped fox dog brown AddMe Exception: System.NotSupportedException: Collection was of a fixed size. at System.Collections.FixedSizeArrayList.Add(Object obj) at SamplesArrayList.Main() Exception: System.NotSupportedException: Collection was of a fixed size. at System.Collections.FixedSizeArrayList.Insert(Int32 index, Object obj) at SamplesArrayList.Main() */
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.