XPQueryExtensions.ToLookupAsync<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 Lookup<TKey,TElement>.
Namespace: DevExpress.Xpo
Assembly: DevExpress.Xpo.v24.2.dll
NuGet Package: DevExpress.Xpo
#Declaration
public static Task<ILookup<TKey, TElement>> ToLookupAsync<T, TKey, TElement>(
this IQueryable<T> query,
Func<T, TKey> keySelector,
Func<T, TElement> elementSelector,
CancellationToken cancellationToken = default(CancellationToken)
)
#Parameters
Name | Type | Description |
---|---|---|
query | IQueryable<T> | An XPQuery |
key |
Func<T, TKey> | A function that acquires each persistent object’s key. |
element |
Func<T, TElement> | A function that returns a result value for each persistent object. |
#Optional Parameters
Name | Type | Default | Description |
---|---|---|---|
cancellation |
Cancellation |
null | A Cancellation |
#Type Parameters
Name |
---|
T |
TKey |
TElement |
#Returns
Type | Description |
---|---|
Task<ILookup<TKey, TElement>> | A Task that returns a Lookup |
See Also