Dictionary<TKey, TValue>::IDictionary::Contains Method (Object^)

 

Determines whether the IDictionary contains an element with the specified key.

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

private:
virtual bool Contains(
	Object^ key
) sealed = IDictionary::Contains

Parameters

key
Type: System::Object^

The key to locate in the IDictionary.

Return Value

Type: System::Boolean

true if the IDictionary contains an element with the specified key; otherwise, false.

Exception Condition
ArgumentNullException

key is null.

This method returns false if key is of a type that is not assignable to the key type TKey of the Dictionary<TKey, TValue>.

This method approaches an O(1) operation.

The following code example shows how to use the IDictionary::Contains method of the System.Collections::IDictionary interface with a Dictionary<TKey, TValue>. The example demonstrates that the method returns false if a key of the wrong data type is supplied.

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

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

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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