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SortedList::Item Property

Gets and sets the value associated with a specific key in a SortedList object.

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

public:
virtual property Object^ Item[Object^ key] {
	Object^ get (Object^ key);
	void set (Object^ key, Object^ value);
}

Parameters

key
Type: System::Object

The key associated with the value to get or set.

Property Value

Type: System::Object
The value associated with the key parameter in the SortedList object, if key is found; otherwise, nullptr.

Implements

IDictionary::Item

ExceptionCondition
ArgumentNullException

key is nullptr.

NotSupportedException

The property is set and the SortedList object is read-only.

-or-

The property is set, key does not exist in the collection, and the SortedList has a fixed size.

OutOfMemoryException

There is not enough available memory to add the element to the SortedList.

InvalidOperationException

The comparer throws an exception.

You can use the Item property to access a specific element in a collection by specifying the following syntax: myCollection[key].

You can also use this property to add new elements by setting the value of a key that does not exist in the SortedList object (for example, myCollection["myNonexistentKey"] = myValue). However, if the specified key already exists in the SortedList, setting the Item property overwrites the old value. In contrast, the Add method does not modify existing elements.

A key cannot be nullptr, but a value can be. To distinguish between nullptr that is returned because the specified key is not found and nullptr that is returned because the value of the specified key is nullptr, use the Contains method or the ContainsKey method to determine if the key exists in the list.

The elements of a SortedList are sorted by the keys either according to a specific IComparer implementation specified when the SortedList is created or according to the IComparable implementation provided by the keys themselves.

The C# language uses the this keyword to define the indexers instead of implementing the Keys property. Visual Basic implements Item as a default property, which provides the same indexing functionality.

Retrieving the value of this property is an O(log n) operation, where n is Count. Setting the property is an O(log n) operation if the key is already in the SortedList. If the key is not in the list, setting the property is an O(n) operation for unsorted data, or O(log n) if the new element is added at the end of the list. If insertion causes a resize, the operation is O(n).

.NET Framework

Supported in: 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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