Qbservable.ToDictionary<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>)

Creates a dictionary from a queryable observable sequence according to a specified key 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) ( _
    source As IQbservable(Of TSource), _
    keySelector As Expression(Of Func(Of TSource, TKey)) _
) As IQbservable(Of IDictionary(Of TKey, TSource))

'Usage
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim returnValue As IQbservable(Of IDictionary(Of TKey, TSource))

returnValue = source.ToDictionary(keySelector)

public static IQbservable<IDictionary<TKey, TSource>> ToDictionary<TSource, TKey>(
    this IQbservable<TSource> source,
    Expression<Func<TSource, TKey>> keySelector
)

[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IQbservable<IDictionary<TKey, TSource>^>^ ToDictionary(
    IQbservable<TSource>^ source, 
    Expression<Func<TSource, TKey>^>^ keySelector
)

static member ToDictionary : 
        source:IQbservable<'TSource> * 
        keySelector:Expression<Func<'TSource, 'TKey>> -> IQbservable<IDictionary<'TKey, 'TSource>> 

JScript does not support generic types and methods.

Type Parameters

• TSource
  The type of source.

• TKey
  The type of key.

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.

Return Value

Type: System.Reactive.Linq.IQbservable<IDictionary<TKey, TSource>>
A dictionary from a queryable observable sequence according to a specified key 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 .

See Also

Reference

Qbservable Class

ToDictionary Overload

System.Reactive.Linq Namespace

Qbservable.ToDictionary<TSource, TKey, TElement> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>, Expression<Func<TSource, TElement>>)

Creates a dictionary from a queryable observable sequence according to a specified key selector function, 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)) _
) 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 returnValue As IQbservable(Of IDictionary(Of TKey, TElement))

returnValue = source.ToDictionary(keySelector, _
    elementSelector)

public static IQbservable<IDictionary<TKey, TElement>> ToDictionary<TSource, TKey, TElement>(
    this IQbservable<TSource> source,
    Expression<Func<TSource, TKey>> keySelector,
    Expression<Func<TSource, TElement>> elementSelector
)

[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
)

static member ToDictionary : 
        source:IQbservable<'TSource> * 
        keySelector:Expression<Func<'TSource, 'TKey>> * 
        elementSelector:Expression<Func<'TSource, 'TElement>> -> 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.

Return Value

Type: System.Reactive.Linq.IQbservable<IDictionary<TKey, TElement>>
A dictionary from a queryable observable sequence according to a specified key selector function, 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 .

See Also

Reference

Qbservable Class

ToDictionary Overload

System.Reactive.Linq Namespace

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 .

See Also

Reference

Qbservable Class

ToDictionary Overload

System.Reactive.Linq Namespace

Qbservable.ToDictionary<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>, IEqualityComparer<TKey>)

Creates a dictionary from a queryable observable sequence according to a specified key selector function, and a comparer.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function ToDictionary(Of TSource, TKey) ( _
    source As IQbservable(Of TSource), _
    keySelector As Expression(Of Func(Of TSource, TKey)), _
    comparer As IEqualityComparer(Of TKey) _
) As IQbservable(Of IDictionary(Of TKey, TSource))

'Usage
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim comparer As IEqualityComparer(Of TKey)
Dim returnValue As IQbservable(Of IDictionary(Of TKey, TSource))

returnValue = source.ToDictionary(keySelector, _
    comparer)

public static IQbservable<IDictionary<TKey, TSource>> ToDictionary<TSource, TKey>(
    this IQbservable<TSource> source,
    Expression<Func<TSource, TKey>> keySelector,
    IEqualityComparer<TKey> comparer
)

[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IQbservable<IDictionary<TKey, TSource>^>^ ToDictionary(
    IQbservable<TSource>^ source, 
    Expression<Func<TSource, TKey>^>^ keySelector, 
    IEqualityComparer<TKey>^ comparer
)

static member ToDictionary : 
        source:IQbservable<'TSource> * 
        keySelector:Expression<Func<'TSource, 'TKey>> * 
        comparer:IEqualityComparer<'TKey> -> IQbservable<IDictionary<'TKey, 'TSource>> 

JScript does not support generic types and methods.

Type Parameters

• TSource
  The type of source.

• TKey
  The type of key.

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.

• comparer
  Type: System.Collections.Generic.IEqualityComparer<TKey>
  An equality comparer to compare keys.

Return Value

Type: System.Reactive.Linq.IQbservable<IDictionary<TKey, TSource>>
A dictionary from a queryable observable sequence according to a specified key selector function, and a comparer.

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

ToDictionary Overload

System.Reactive.Linq Namespace