ArrayList.IsFixedSize プロパティ
アセンブリ: mscorlib (mscorlib.dll 内)


固定サイズのコレクションでは、コレクションの作成後に要素の追加または削除はできませんが、既存の要素の変更はできます。
固定サイズのコレクションは、コレクションの要素の追加/削除を防ぐラッパーがコレクションに組み込まれているに過ぎません。したがって、要素の追加または削除を含め、基になっているコレクションに変更が加えられた場合、固定サイズのコレクションでもその内容が反映されます。

ArrayList をラップする固定サイズのラッパーを作成する方法を次のコード例に示します。
Imports System Imports System.Collections Imports Microsoft.VisualBasic Public Class SamplesArrayList Public Shared Sub Main() ' Creates and initializes a new ArrayList. Dim myAL As New 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. Dim myFixedSizeAL As ArrayList = ArrayList.FixedSize(myAL) ' Display whether the ArrayLists have a fixed size or not. Dim msg As String If myAL.IsFixedSize Then msg = "has a fixed size" Else msg = "does not have a fixed size" End If Console.WriteLine("myAL {0}.", msg) If myFixedSizeAL.IsFixedSize Then msg = "has a fixed size" Else msg = "does not have a fixed size" End If Console.WriteLine("myFixedSizeAL {0}.", msg) Console.WriteLine() ' Display both ArrayLists. Console.WriteLine("Initially,") Console.Write("Standard :") PrintValues(myAL, " "c) Console.Write("Fixed size:") PrintValues(myFixedSizeAL, " "c) ' Sort is allowed in the fixed-size ArrayList. myFixedSizeAL.Sort() ' Display both ArrayLists. Console.WriteLine("After Sort,") Console.Write("Standard :") PrintValues(myAL, " "c) Console.Write("Fixed size:") PrintValues(myFixedSizeAL, " "c) ' Reverse is allowed in the fixed-size ArrayList. myFixedSizeAL.Reverse() ' Display both ArrayLists. Console.WriteLine("After Reverse,") Console.Write("Standard :") PrintValues(myAL, " "c) Console.Write("Fixed size:") PrintValues(myFixedSizeAL, " "c) ' 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, " "c) Console.Write("Fixed size:") PrintValues(myFixedSizeAL, " "c) Console.WriteLine() ' Adding or inserting elements to the fixed-size ArrayList throws an exception. Try myFixedSizeAL.Add("AddMe2") Catch myException As Exception Console.WriteLine("Exception: " + myException.ToString()) End Try Try myFixedSizeAL.Insert(3, "InsertMe") Catch myException As Exception Console.WriteLine("Exception: " + myException.ToString()) End Try End Sub 'Main Public Shared Sub PrintValues(myList As IEnumerable, mySeparator As Char) Dim obj As [Object] For Each obj In myList Console.Write("{0}{1}", mySeparator, obj) Next obj Console.WriteLine() End Sub 'PrintValues End Class ' 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()
using System; using System.Collections; public class SamplesArrayList { public static void Main() { // Creates and initializes a new ArrayList. ArrayList myAL = new 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 ? "has a fixed size" : "does not have a fixed size" ); Console.WriteLine( "myFixedSizeAL {0}.", myFixedSizeAL.IsFixedSize ? "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: " + myException.ToString()); } try { myFixedSizeAL.Insert( 3, "InsertMe" ); } catch ( Exception myException ) { Console.WriteLine("Exception: " + myException.ToString()); } } public static void PrintValues( IEnumerable myList, char mySeparator ) { foreach ( Object obj in myList ) 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() */
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() */
import System.*; import System.Collections.*; public class SamplesArrayList { public static void main(String[] args) { // Creates and initializes a new ArrayList. ArrayList myAL = new 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.get_IsFixedSize() ? "has a fixed size" : "does not have a fixed size"); Console.WriteLine("myFixedSizeAL {0}.", myFixedSizeAL.get_IsFixedSize() ? "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 (System.Exception myException) { Console.WriteLine("Exception: " + myException.ToString()); } try { myFixedSizeAL.Insert(3, "InsertMe"); } catch (System.Exception myException) { Console.WriteLine("Exception: " + myException.ToString()); } } //main public static void PrintValues(IEnumerable myList, char mySeparator) { IEnumerator objMyEnum = myList.GetEnumerator(); while (objMyEnum.MoveNext()) { Object obj = objMyEnum.get_Current(); Console.Write("{0}{1}", new Character(mySeparator), obj); } Console.WriteLine(); } //PrintValues } //SamplesArrayList /* 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(String[] args) Exception: System.NotSupportedException: Collection was of a fixed size. at System.Collections.FixedSizeArrayList.Insert(Int32 index, Object obj) at SamplesArrayList.main(String[] args) */
import System; import System.Collections; // Creates and initializes a new ArrayList. var myAL : ArrayList = new 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. var myFixedSizeAL : ArrayList = ArrayList.FixedSize( myAL ); // Display whether the ArrayLists have a fixed size or not. Console.WriteLine( "myAL {0}.", myAL.IsFixedSize ? "has a fixed size" : "does not have a fixed size" ); Console.WriteLine( "myFixedSizeAL {0}.", myFixedSizeAL.IsFixedSize ? "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 ( myException : Exception ) { Console.WriteLine("Exception: " + myException.ToString()); } try { myFixedSizeAL.Insert( 3, "InsertMe" ); } catch ( myException : Exception ) { Console.WriteLine("Exception: " + myException.ToString()); } function PrintValues( myList : IEnumerable, mySeparator : char ) { var myEnumerator : System.Collections.IEnumerator = myList.GetEnumerator(); while ( myEnumerator.MoveNext() ) Console.Write( "{0}{1}", mySeparator, myEnumerator.Current ); 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 JScript 0.Global Code() Exception: System.NotSupportedException: Collection was of a fixed size. at System.Collections.FixedSizeArrayList.Insert(Int32 index, Object obj) at JScript 0.Global Code() */

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