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Dictionary<TKey, TValue>::KeyCollection::ICollection<TKey>::Contains Method (TKey)
Determines whether the ICollection<T> contains a specific value.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- item
-
Type:
TKey
The object to locate in the ICollection<T>.
Implements
ICollection<T>::Contains(T)Implementations can vary in how they determine equality of objects; for example, List<T> uses Default, whereas, Dictionary<TKey, TValue> allows the user to specify the IComparer<T> implementation to use for comparing keys.
This method is an O(1) operation.
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
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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