ReadOnlyCollection<T>.IList.Contains(Object) Method

Reference

Definition

Namespace:: System.Collections.ObjectModel

Assemblies:: mscorlib.dll, System.Runtime.dll

Assemblies:: netstandard.dll, System.Runtime.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: ReadOnlyCollection.cs

Source:: ReadOnlyCollection.cs

Source:: ReadOnlyCollection.cs

Important

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Determines whether the IList contains a specific value.

 virtual bool System.Collections.IList.Contains(System::Object ^ value) = System::Collections::IList::Contains;

bool IList.Contains(object value);

abstract member System.Collections.IList.Contains : obj -> bool
override this.System.Collections.IList.Contains : obj -> bool

Function Contains (value As Object) As Boolean Implements IList.Contains

Parameters

value: Object

The Object to locate in the IList.

Returns

Boolean

true if the Object is found in the IList; otherwise, false.

Implements

Contains(Object)

Exceptions

ArgumentException

value is not of the type specified for the generic type parameter T.

Remarks

This method determines equality using the default comparer EqualityComparer<T>.Default.

This method performs a linear search; therefore, this method is an O(n) operation, where n is Count.

This member is an explicit interface member implementation. It can be used only when the ReadOnlyCollection<T> instance is cast to an IList interface.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP	10.0

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