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Dictionary<TKey, TValue>.IDictionary.Remove Method (Object)


Removes the element with the specified key from the IDictionary.

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

void IDictionary.Remove(
	object key


Type: System.Object

The key of the element to remove.

Exception Condition

key is null.

This method approaches an O(1) operation.

The following code example shows how to use the IDictionary.Remove of the System.Collections.IDictionary interface with a Dictionary<TKey, TValue>.

The code example is part of a larger example, including output, provided for the IDictionary.Add method.

using System;
using System.Collections;
using System.Collections.Generic;

public class Example
    public static void Main()
        // Create a new dictionary of strings, with string keys,
        // and access it using the IDictionary interface.
        IDictionary openWith = new Dictionary<string, string>();

        // Add some elements to the dictionary. There are no 
        // duplicate keys, but some of the values are duplicates.
        // IDictionary.Add throws an exception if incorrect types
        // are supplied for key or value.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");
// Use the Remove method to remove a key/value pair. No
// exception is thrown if the wrong data type is supplied.

if (!openWith.Contains("dib"))
    Console.WriteLine("Key \"dib\" is not found.");

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
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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