StringDictionary.ContainsKey Method (String)


Determines if the StringDictionary contains a specific key.

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

abstract ContainsKey : 
        key:string -> bool
override ContainsKey : 
        key:string -> bool


Type: System.String

The key to locate in the StringDictionary.

Return Value

Type: System.Boolean

true if the StringDictionary contains an entry with the specified key; otherwise, false.

Exception Condition

The key is null.

The key is handled in a case-insensitive manner; it is translated to lowercase before it is used.

This method is an O(1) operation.

Starting with the .NET Framework 2.0, this method uses the collection’s objects’ Equals and CompareTo methods on item to determine whether item exists. In the earlier versions of the .NET Framework, this determination was made by using the Equals and CompareTo methods of the item parameter on the objects in the collection.

The following code example searches for an element in a StringDictionary.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Return to top