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SortedList::RemoveAt Method

Removes the element at the specified index of a SortedList object.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)

public:
virtual void RemoveAt(
	int index
)

Parameters

index
Type: System::Int32

The zero-based index of the element to remove.

ExceptionCondition
ArgumentOutOfRangeException

index is outside the range of valid indexes for the SortedList object.

NotSupportedException

The SortedList is read-only.

-or-

The SortedList has a fixed size.

The index sequence is based on the sort sequence. When an element is added, it is inserted into SortedList in the correct sort order, and the indexing adjusts accordingly. When an element is removed, the indexing also adjusts accordingly. Therefore, the index of a specific key/value pair might change as elements are added or removed from the SortedList object.

In collections of contiguous elements, such as lists, the elements that follow the removed element move up to occupy the vacated spot. If the collection is indexed, the indexes of the elements that are moved are also updated. This behavior does not apply to collections where elements are conceptually grouped into buckets, such as a hash table.

This method is an O(n) operation, where n is Count.

The following code example shows how to remove elements from a SortedList object.

#using <system.dll>

using namespace System;
using namespace System::Collections;
void PrintKeysAndValues( SortedList^ myList )
{
   Console::WriteLine( "\t-KEY-\t-VALUE-" );
   for ( int i = 0; i < myList->Count; i++ )
   {
      Console::WriteLine( "\t{0}:\t{1}", myList->GetKey( i ), myList->GetByIndex( i ) );

   }
   Console::WriteLine();
}

int main()
{

   // Creates and initializes a new SortedList.
   SortedList^ mySL = gcnew SortedList;
   mySL->Add( "3c", "dog" );
   mySL->Add( "2c", "over" );
   mySL->Add( "1c", "brown" );
   mySL->Add( "1a", "The" );
   mySL->Add( "1b", "quick" );
   mySL->Add( "3a", "the" );
   mySL->Add( "3b", "lazy" );
   mySL->Add( "2a", "fox" );
   mySL->Add( "2b", "jumped" );

   // Displays the SortedList.
   Console::WriteLine( "The SortedList initially contains the following:" );
   PrintKeysAndValues( mySL );

   // Removes the element with the key "3b".
   mySL->Remove( "3b" );

   // Displays the current state of the SortedList.
   Console::WriteLine( "After removing \"lazy\":" );
   PrintKeysAndValues( mySL );

   // Removes the element at index 5.
   mySL->RemoveAt( 5 );

   // Displays the current state of the SortedList.
   Console::WriteLine( "After removing the element at index 5:" );
   PrintKeysAndValues( mySL );
}

/*
This code produces the following output.

The SortedList initially contains the following:
        -KEY-   -VALUE-
        1a:     The
        1b:     quick
        1c:     brown
        2a:     fox
        2b:     jumped
        2c:     over
        3a:     the
        3b:     lazy
        3c:     dog

After removing "lazy":
        -KEY-   -VALUE-
        1a:     The
        1b:     quick
        1c:     brown
        2a:     fox
        2b:     jumped
        2c:     over
        3a:     the
        3c:     dog

After removing the element at index 5:
        -KEY-   -VALUE-
        1a:     The
        1b:     quick
        1c:     brown
        2a:     fox
        2b:     jumped
        3a:     the
        3c:     dog
*/

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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