Dictionary<TKey, TValue>.Remove Method
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Removes the value with the specified key from the Dictionary<TKey, TValue>.
Namespace: System.Collections.Generic
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Function Remove ( _
key As TKey _
) As Boolean
public bool Remove(
TKey key
)
Parameters
- key
Type: TKey
The key of the element to remove.
Return Value
Type: System.Boolean
true if the element is successfully found and removed; otherwise, false. This method returns false if key is not found in the Dictionary<TKey, TValue>.
Implements
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | key is nulla null reference (Nothing in Visual Basic). |
Remarks
If the Dictionary<TKey, TValue> does not contain an element with the specified key, the Dictionary<TKey, TValue> remains unchanged. No exception is thrown.
This method approaches an O(1) operation.
Examples
The following code example shows how to remove a key/value pair from a dictionary using the Remove method.
This code example is part of a larger example provided for the Dictionary<TKey, TValue> class.
' Use the Remove method to remove a key/value pair.
outputBlock.Text &= vbLf + "Remove(""doc"")" & vbCrLf
openWith.Remove("doc")
If Not openWith.ContainsKey("doc") Then
outputBlock.Text &= "Key ""doc"" is not found." & vbCrLf
End If
// Use the Remove method to remove a key/value pair.
outputBlock.Text += "\nRemove(\"doc\")" + "\n";
openWith.Remove("doc");
if (!openWith.ContainsKey("doc"))
{
outputBlock.Text += "Key \"doc\" is not found." + "\n";
}
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.