IDictionary.Remove Method

Removes the element with the specified key from the IDictionary object.

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

void Remove (
	Object^ key
void Remove (
	Object key
function Remove (
	key : Object
Not applicable.



The key of the element to remove.

Exception typeCondition


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


The IDictionary object is read-only.


The IDictionary has a fixed size.

If the IDictionary object does not contain an element with the specified key, the IDictionary remains unchanged. No exception is thrown.

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

    virtual void Remove(Object^ key)
        if (key == nullptr)
            throw gcnew ArgumentNullException("key");
        // Try to find the key in the DictionaryEntry array
        int index;
        if (TryGetIndexOfKey(key, &index))
            // If the key is found, slide all the items down.
            Array::Copy(items, index + 1, items, index, itemsInUse -
                index - 1);
            // If the key is not in the dictionary, just return.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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