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SortedList Constructor (IComparer)

Initializes a new instance of the SortedList class that is empty, has the default initial capacity, and is sorted according to the specified IComparer interface.

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

new : 
        comparer:IComparer -> SortedList


Type: System.Collections.IComparer

The IComparer implementation to use when comparing keys.


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

The elements are sorted according to the specified IComparer implementation. If the comparer parameter is a null reference (Nothing in Visual Basic), the IComparable implementation of each key is used; therefore, each key must implement the IComparable interface to be capable of comparisons with every other key in the SortedList object.

The capacity of a SortedList object is the number of elements that the SortedList can hold. As elements are added to a SortedList, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the SortedList object.

This constructor is an O(1) operation.

The following code example creates collections using different SortedList constructors and demonstrates the differences in the behavior of the collections.

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, 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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