ArrayList::Reverse Method (Int32, Int32)
.NET Framework (current version)
Reverses the order of the elements in the specified range.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- index
-
Type:
System::Int32
The zero-based starting index of the range to reverse.
- count
-
Type:
System::Int32
The number of elements in the range to reverse.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | index is less than zero. -or- count is less than zero. |
| ArgumentException | index and count do not denote a valid range of elements in the ArrayList. |
| NotSupportedException | The ArrayList is read-only. |
This method uses Array::Reverse to reverse the order of the elements, such that the element at ArrayList [i], where i is any index within the range, moves to ArrayList [j], where j equals index + index + count - i - 1.
This method is an O(n) operation, where n is count.
The following code example shows how to reverse the sort order of the values in a range of elements in an ArrayList.
using namespace System; using namespace System::Collections; void PrintValues( IEnumerable^ myList ); 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" ); // Displays the values of the ArrayList. Console::WriteLine( "The ArrayList initially contains the following values:" ); PrintValues( myAL ); // Reverses the sort order of the values of the ArrayList. myAL->Reverse( 1, 3 ); // Displays the values of the ArrayList. Console::WriteLine( "After reversing:" ); PrintValues( myAL ); } void PrintValues( IEnumerable^ myList ) { IEnumerator^ myEnum = myList->GetEnumerator(); while ( myEnum->MoveNext() ) { Object^ obj = safe_cast<Object^>(myEnum->Current); Console::WriteLine( " {0}", obj ); } Console::WriteLine(); } /* This code produces the following output. The ArrayList initially contains the following values: The QUICK BROWN FOX jumps over the lazy dog After reversing: The FOX BROWN QUICK jumps over the lazy dog */
Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Available since 10
.NET Framework
Available since 1.1
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