Qbservable.ToDictionary<TSource, TKey, TElement> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>, Expression<Func<TSource, TElement>>, IEqualityComparer<TKey>)
Creates a dictionary from a queryable observable sequence according to a specified key selector function, a comparer, and an element selector function.
Namespace: System.Reactive.Linq
Assembly: System.Reactive.Providers (in System.Reactive.Providers.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function ToDictionary(Of TSource, TKey, TElement) ( _
source As IQbservable(Of TSource), _
keySelector As Expression(Of Func(Of TSource, TKey)), _
elementSelector As Expression(Of Func(Of TSource, TElement)), _
comparer As IEqualityComparer(Of TKey) _
) As IQbservable(Of IDictionary(Of TKey, TElement))
'Usage
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim elementSelector As Expression(Of Func(Of TSource, TElement))
Dim comparer As IEqualityComparer(Of TKey)
Dim returnValue As IQbservable(Of IDictionary(Of TKey, TElement))
returnValue = source.ToDictionary(keySelector, _
elementSelector, comparer)
public static IQbservable<IDictionary<TKey, TElement>> ToDictionary<TSource, TKey, TElement>(
this IQbservable<TSource> source,
Expression<Func<TSource, TKey>> keySelector,
Expression<Func<TSource, TElement>> elementSelector,
IEqualityComparer<TKey> comparer
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TKey, typename TElement>
static IQbservable<IDictionary<TKey, TElement>^>^ ToDictionary(
IQbservable<TSource>^ source,
Expression<Func<TSource, TKey>^>^ keySelector,
Expression<Func<TSource, TElement>^>^ elementSelector,
IEqualityComparer<TKey>^ comparer
)
static member ToDictionary :
source:IQbservable<'TSource> *
keySelector:Expression<Func<'TSource, 'TKey>> *
elementSelector:Expression<Func<'TSource, 'TElement>> *
comparer:IEqualityComparer<'TKey> -> IQbservable<IDictionary<'TKey, 'TElement>>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
- TKey
The type of key.
- TElement
The type of element.
Parameters
- source
Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence to create a dictionary for.
- keySelector
Type: System.Linq.Expressions.Expression<Func<TSource, TKey>>
A function to extract a key from each element.
- elementSelector
Type: System.Linq.Expressions.Expression<Func<TSource, TElement>>
A transform function to produce a result element value from each element.
- comparer
Type: System.Collections.Generic.IEqualityComparer<TKey>
An equality comparer to compare keys.
Return Value
Type: System.Reactive.Linq.IQbservable<IDictionary<TKey, TElement>>
A dictionary from a queryable observable sequence according to a specified key selector function, a comparer, and an element selector function.
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 .