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ArrayList.Sort Method (Int32, Int32, IComparer)

Sorts the elements in a range of elements in ArrayList using the specified comparer.

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

abstract Sort : 
        index:int * 
        count:int * 
        comparer:IComparer -> unit  
override Sort : 
        index:int * 
        count:int * 
        comparer:IComparer -> unit


Type: System.Int32

The zero-based starting index of the range to sort.

Type: System.Int32

The length of the range to sort.

Type: System.Collections.IComparer

The IComparer implementation to use when comparing elements.


A null reference (Nothing in Visual Basic) to use the IComparable implementation of each element.


index is less than zero.


count is less than zero.


index and count do not specify a valid range in the ArrayList.


The ArrayList is read-only.


An error occurred while comparing two elements.

If comparer is set to a null reference (Nothing in Visual Basic), this method performs a comparison sort (also called an unstable sort); that is, if two elements are equal, their order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal. To perform a stable sort, you must implement a custom IComparer interface.

On average, this method is an O(n log n) operation, where n is count; in the worst case it is an O(n^2) operation.

The following code example shows how to sort the values in a range of elements in an ArrayList using the default comparer and a custom comparer that reverses the sort order.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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