Determines whether an element is in the CollectionT.
Assembly: mscorlib (in mscorlib.dll)
Public Function Contains ( _
item As T _
) As [%$TOPIC/ms132407_en-us_VS_110_2_0_0_0_0%]public [%$TOPIC/ms132407_en-us_VS_110_2_0_1_0_0%] Contains(
T item
)public:
virtual [%$TOPIC/ms132407_en-us_VS_110_2_0_2_0_0%] Contains(
T item
) sealedabstract Contains :
item:'T -> [%$TOPIC/ms132407_en-us_VS_110_2_0_3_0_0%]
override Contains :
item:'T -> [%$TOPIC/ms132407_en-us_VS_110_2_0_3_0_1%]Parameters
- item
- Type:
T
The object to locate in the CollectionT. The value can be for reference types.
Implements
ICollectionTContains(T)If the CollectionT object is created using the default constructor, this method determines equality using the default equality comparer EqualityComparerTDefault for T, the type of values in the list. If type T does not implement the IEquatableT interface, the Equals method is used.
If the Collection object is created by passing an IListT object to the constructor, the Contains method will be determined by the IEqualityComparerT interface used by that IListT object.
This method performs a linear search; therefore, the average execution time is proportional to Count. That is, this method is an O(n) operation, where n is Count.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
