IFdbPagedQuery<TResult>

Namespace: FoundationDB.Client · interface

Implements: IFdbRangeQuery, IAsyncQuery<ReadOnlyMemory<TResult>>

Query that will asynchronously stream batches of decoded results from onr or more GetRange operations

Remarks

The results are returned batches of results, as soon as they are received by the client. The size of the batch may vary, and can be controlled by the Streaming option.

Methods

ForEachAsync

Task ForEachAsync(PageAction<TResult> handler)

Executes an action on each pages of key/value pairs in the range results

Task<TAggregate> ForEachAsync<TAggregate>(TAggregate aggregate, PageAggregator<TAggregate, TResult> action)

Executes an action on each pages of key/value pairs in the range results

Reverse

IFdbPagedQuery<TResult> Reverse()

Reverses the order in which the results will be returned

Returns: A new query object that will return the results in reverse order when executed

Calling Reverse on an already reversed query will cancel the effect, and the results will be returned in their natural order.

Select

IFdbPagedQuery<TOther> Select<TOther>(PageFunc<TResult, TOther> lambda)

Projects each element of the range results into a new form.

• lambda — Function that is invoked for each source element, and will return the corresponding transformed element.

Returns: New range query that outputs the sequence of transformed elements

query.Select((kv) => $" = ")

ToArrayAsync

Task<TResult[]> ToArrayAsync()

Returns a flattened array with all the elements of the range results

ToListAsync

Task<List<TResult>> ToListAsync()

Returns a flattened list of all the elements of the range results