ArrayList.FixedSize Metoda
Důležité
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Vrátí obálku seznamu s pevnou velikostí, kde je povoleno měnit prvky, ale nejsou přidány nebo odebrány.
FixedSize(ArrayList) |
Vrátí obálku ArrayList s pevnou velikostí. |
FixedSize(IList) |
Vrátí obálku IList s pevnou velikostí. |
- Zdroj:
- ArrayList.cs
- Zdroj:
- ArrayList.cs
- Zdroj:
- ArrayList.cs
Vrátí obálku ArrayList s pevnou velikostí.
public:
static System::Collections::ArrayList ^ FixedSize(System::Collections::ArrayList ^ list);
public static System.Collections.ArrayList FixedSize (System.Collections.ArrayList list);
static member FixedSize : System.Collections.ArrayList -> System.Collections.ArrayList
Public Shared Function FixedSize (list As ArrayList) As ArrayList
Parametry
Návraty
Obálka ArrayList s pevnou velikostí.
Výjimky
list
je null
.
Příklady
Následující příklad kódu ukazuje, jak vytvořit obálku s pevnou velikostí kolem objektu 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( "jumps" );
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 jumps over the lazy dog
Fixed size: The quick brown fox jumps over the lazy dog
After Sort,
Standard : brown dog fox jumps lazy over quick the The
Fixed size: brown dog fox jumps lazy over quick the The
After Reverse,
Standard : The the quick over lazy jumps fox dog brown
Fixed size: The the quick over lazy jumps fox dog brown
After adding to the standard ArrayList,
Standard : The the quick over lazy jumps fox dog brown AddMe
Fixed size: The the quick over lazy jumps 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( "jumps" );
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 jumps over the lazy dog
Fixed size: The quick brown fox jumps over the lazy dog
After Sort,
Standard : brown dog fox jumps lazy over quick the The
Fixed size: brown dog fox jumps lazy over quick the The
After Reverse,
Standard : The the quick over lazy jumps fox dog brown
Fixed size: The the quick over lazy jumps fox dog brown
After adding to the standard ArrayList,
Standard : The the quick over lazy jumps fox dog brown AddMe
Fixed size: The the quick over lazy jumps 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(int index, Object obj)
at SamplesArrayList.Main()
*/
Imports System.Collections
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("jumps")
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
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
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 jumps over the lazy dog
' Fixed size: The quick brown fox jumps over the lazy dog
' After Sort,
' Standard : brown dog fox jumps lazy over quick the The
' Fixed size: brown dog fox jumps lazy over quick the The
' After Reverse,
' Standard : The the quick over lazy jumps fox dog brown
' Fixed size: The the quick over lazy jumps fox dog brown
' After adding to the standard ArrayList,
' Standard : The the quick over lazy jumps fox dog brown AddMe
' Fixed size: The the quick over lazy jumps 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()
Poznámky
Tuto obálku lze použít k zabránění přidání a odstranění z původního ArrayListsouboru . Prvky je stále možné upravit nebo nahradit.
Kolekce s pevnou velikostí je jednoduše kolekce s obálkou, která zabraňuje přidávání a odebírání prvků; proto pokud jsou provedeny změny v podkladové kolekci, včetně přidání nebo odebrání prvků, kolekce s pevnou velikostí tyto změny odráží.
Tato metoda je O(1)
operace.
Platí pro
.NET 9 a další verze
Produkt | Verze |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
UWP | 10.0 |
- Zdroj:
- ArrayList.cs
- Zdroj:
- ArrayList.cs
- Zdroj:
- ArrayList.cs
Vrátí obálku IList s pevnou velikostí.
public:
static System::Collections::IList ^ FixedSize(System::Collections::IList ^ list);
public static System.Collections.IList FixedSize (System.Collections.IList list);
static member FixedSize : System.Collections.IList -> System.Collections.IList
Public Shared Function FixedSize (list As IList) As IList
Parametry
Návraty
Obálka IList s pevnou velikostí.
Výjimky
list
je null
.
Poznámky
Tuto obálku lze použít k zabránění přidání a odstranění z původního IListsouboru . Prvky je stále možné upravit nebo nahradit.
Kolekce s pevnou velikostí je jednoduše kolekce s obálkou, která zabraňuje přidávání a odebírání prvků; proto pokud jsou provedeny změny v podkladové kolekci, včetně přidání nebo odebrání prvků, kolekce s pevnou velikostí tyto změny odráží.
Tato metoda je O(1)
operace.
Platí pro
.NET 9 a další verze
Produkt | Verze |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
UWP | 10.0 |
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