Qbservable

Qbservable.Contains<TSource> Method (IQbservable<TSource>, TSource, IEqualityComparer<TSource>)

Determines whether an observable sequence contains a specified element by using a specified source type, source, value and comparer.

Namespace:  System.Reactive.Linq
Assembly:  System.Reactive.Providers (in System.Reactive.Providers.dll)

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Contains(Of TSource) ( _
    source As IQbservable(Of TSource), _
    value As TSource, _
    comparer As IEqualityComparer(Of TSource) _
) As IQbservable(Of Boolean)
'Usage
Dim source As IQbservable(Of TSource)
Dim value As TSource
Dim comparer As IEqualityComparer(Of TSource)
Dim returnValue As IQbservable(Of Boolean)

returnValue = source.Contains(value, _
    comparer)
public static IQbservable<bool> Contains<TSource>(
    this IQbservable<TSource> source,
    TSource value,
    IEqualityComparer<TSource> comparer
)
[ExtensionAttribute]
public:
generic<typename TSource>
static IQbservable<bool>^ Contains(
    IQbservable<TSource>^ source, 
    TSource value, 
    IEqualityComparer<TSource>^ comparer
)
static member Contains : 
        source:IQbservable<'TSource> * 
        value:'TSource * 
        comparer:IEqualityComparer<'TSource> -> IQbservable<bool> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.

Parameters

Return Value

Type: System.Reactive.Linq.IQbservable<Boolean>
True if an observable sequence contains a specified element by using a specified source type, source, value and comparer; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

See Also

Reference

Qbservable Class

Contains Overload

System.Reactive.Linq Namespace

Qbservable.Contains<TSource> Method (IQbservable<TSource>, TSource)

Determines whether a queryable observable sequence contains a specified element by using the default equality comparer.

Namespace:  System.Reactive.Linq
Assembly:  System.Reactive.Providers (in System.Reactive.Providers.dll)

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Contains(Of TSource) ( _
    source As IQbservable(Of TSource), _
    value As TSource _
) As IQbservable(Of Boolean)
'Usage
Dim source As IQbservable(Of TSource)
Dim value As TSource
Dim returnValue As IQbservable(Of Boolean)

returnValue = source.Contains(value)
public static IQbservable<bool> Contains<TSource>(
    this IQbservable<TSource> source,
    TSource value
)
[ExtensionAttribute]
public:
generic<typename TSource>
static IQbservable<bool>^ Contains(
    IQbservable<TSource>^ source, 
    TSource value
)
static member Contains : 
        source:IQbservable<'TSource> * 
        value:'TSource -> IQbservable<bool> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.

Parameters

Return Value

Type: System.Reactive.Linq.IQbservable<Boolean>
True if a queryable observable sequence contains a specified element by using the default equality comparer; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

See Also

Reference

Qbservable Class

Contains Overload

System.Reactive.Linq Namespace