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DictionaryBase.IDictionary.Add Method

Adds an element with the specified key and value into the DictionaryBase.

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

private abstract Add : 
        key:Object * 
        value:Object -> unit  
private override Add : 
        key:Object * 
        value:Object -> unit

Parameters

key
Type: System.Object

The key of the element to add.

value
Type: System.Object

The value of the element to add.

Implements

IDictionary.Add(Object, Object)

ExceptionCondition
ArgumentNullException

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

ArgumentException

An element with the same key already exists in the DictionaryBase.

NotSupportedException

The DictionaryBase is read-only.

-or-

The DictionaryBase has a fixed size.

An object that has no correlation between its state and its hash code value should typically not be used as the key. For example, String objects are better than StringBuilder objects for use as keys.

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

This method is an O(1) operation.

The following code example implements the DictionaryBase class and uses that implementation to create a dictionary of String keys and values that have a Length of 5 characters or less.

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

.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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