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.NET Standard 2.0+

XPQueryExtensions.ToDictionaryAsync<T, TKey, TElement>(IQueryable<T>, Func<T, TKey>, Func<T, TElement>, CancellationToken) Method

Asynchronously enumerates a query and uses a key selector and an element selector to construct a Dictionary<TKey,TValue>.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v19.2.dll

Declaration

public static Task<Dictionary<TKey, TElement>> ToDictionaryAsync<T, TKey, TElement>(
    this IQueryable<T> query,
    Func<T, TKey> keySelector,
    Func<T, TElement> elementSelector,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function ToDictionaryAsync(Of T, TKey, TElement)(
    query As IQueryable(Of T),
    keySelector As Func(Of T, TKey),
    elementSelector As Func(Of T, TElement),
    cancellationToken As CancellationToken = Nothing
) As Task(Of Dictionary(Of TKey, TElement))
public static Task<Dictionary<TKey, TElement>> ToDictionaryAsync<T, TKey, TElement>(
    this IQueryable<T> query,
    Func<T, TKey> keySelector,
    Func<T, TElement> elementSelector,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function ToDictionaryAsync(Of T, TKey, TElement)(
    query As IQueryable(Of T),
    keySelector As Func(Of T, TKey),
    elementSelector As Func(Of T, TElement),
    cancellationToken As CancellationToken = Nothing
) As Task(Of Dictionary(Of TKey, TElement))

Parameters

Name Type Description
query IQueryable<T>

An XPQuery<T> to be enumerated.

keySelector Func<T, TKey>

An function that acquires each persistent object's key.

elementSelector Func<T, TElement>

A function that returns a result value for each persistent object.

cancellationToken CancellationToken

A CancellationToken object that delivers a cancellation notice to the running operation.

Parameters

Name Type Description
query IQueryable<T>

An XPQuery<T> to be enumerated.

keySelector Func<T, TKey>

An function that acquires each persistent object's key.

elementSelector Func<T, TElement>

A function that returns a result value for each persistent object.

cancellationToken CancellationToken

A CancellationToken object that delivers a cancellation notice to the running operation.

Returns

Type Description
Task<Dictionary<TKey, TElement>>

A Task that returns a Dictionary<TKey,TValue>.

Returns

Type Description
Task<Dictionary<TKey, TElement>>

A Task that returns a Dictionary<TKey,TValue>.

Type Parameters

Name Description
T
TKey
TElement

Type Parameters

Name Description
T
TKey
TElement
See Also