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IDictionary.Remove Method (Object)


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

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

void Remove(
	object key


Type: System.Object

The key of the element to remove.

Exception Condition

key is null.


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.

public void Remove(object key)
    if (key == null) throw new ArgumentNullException("key");
    // Try to find the key in the DictionaryEntry array
    Int32 index;
    if (TryGetIndexOfKey(key, out index))
        // If the key is found, slide all the items up.
        Array.Copy(items, index + 1, items, index, ItemsInUse - index - 1);
        // If the key is not in the dictionary, just return. 

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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