IDictionary.Add Method

Syntax

'Declaration
Sub Add ( _
    key As Object, _
    value As Object _
)

void Add(
    Object key,
    Object value
)

Exceptions

Remarks

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

Implementations can vary in whether they allow the key to be nulla null reference (Nothing in Visual Basic).

Examples

The following code example demonstrates how to implement the Add method. This code example is part of a larger example provided for the IDictionary class.

Public Sub Add(ByVal key As Object, ByVal value As Object) Implements IDictionary.Add

   ' Add the new key/value pair even if this key already exists in the dictionary.
   If ItemsInUse = items.Length Then
      Throw New InvalidOperationException("The dictionary cannot hold any more items.")
   End If
   items(ItemsInUse) = New DictionaryEntry(key, value)
   ItemsInUse = ItemsInUse + 1
End Sub

public void Add(object key, object value)
{
   // Add the new key/value pair even if this key already exists in the dictionary.
   if (ItemsInUse == items.Length)
      throw new InvalidOperationException("The dictionary cannot hold any more items.");
   items[ItemsInUse++] = new DictionaryEntry(key, value);
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

See Also

Reference