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SortedList Constructor (IDictionary, IComparer)

SortedList Constructor (IDictionary, IComparer)

Initializes a new instance of the SortedList class that contains elements copied from the specified dictionary, has the same initial capacity as the number of elements copied, and is sorted according to the specified IComparer interface.

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

new : 
        d:IDictionary * 
        comparer:IComparer -> SortedList


Type: System.Collections.IDictionary

The IDictionary implementation to copy to a new SortedList object.

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.


d is a null reference (Nothing in Visual Basic).


comparer is a null reference (Nothing in Visual Basic), and one or more elements in d do not implement the IComparable interface.

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.

A Hashtable object is an example of an IDictionary implementation that can be passed to this constructor. The new SortedList object contains a copy of the keys and values stored in the Hashtable.

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(n) operation, where n is the number of elements in d.

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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