/// <summary>
/// Asynchronously loads data from query to a dictionary
/// </summary>
/// <typeparam name="TSource">Query element type</typeparam>
/// <typeparam name="TKey">Dictionary key type</typeparam>
/// <param name="source">Source query</param>
/// <param name="keySelector">Source element key selector</param>
/// <param name="comparer">Dictionary key comparer</param>
/// <returns>Dictionary with query results</returns>
public static Task <Dictionary <TKey, TSource> > ToDictionaryAsync <TSource, TKey>(this IQueryable <TSource> source,
Func <TSource, TKey> keySelector, IEqualityComparer <TKey> comparer = null) where TKey : notnull
{
return(comparer == null
? AsyncExtensions.ToDictionaryAsync(source, keySelector)
: AsyncExtensions.ToDictionaryAsync(source, keySelector, comparer));
}
/// <summary>
/// Asynchronously loads data from query to a dictionary.
/// </summary>
/// <typeparam name="TSource">Query element type.</typeparam>
/// <typeparam name="TKey">Dictionary key type.</typeparam>
/// <typeparam name="TElement">Dictionary element type.</typeparam>
/// <param name="source">Source query.</param>
/// <param name="keySelector">Source element key selector.</param>
/// <param name="elementSelector">Dictionary element selector.</param>
/// <param name="comparer">Dictionary key comparer.</param>
/// <param name="token">Optional asynchronous operation cancellation token.</param>
/// <returns>Dictionary with query results.</returns>
public static Task <Dictionary <TKey, TElement> > ToDictionaryAsyncLinqToDB <TSource, TKey, TElement>(
this IQueryable <TSource> source,
Func <TSource, TKey> keySelector,
Func <TSource, TElement> elementSelector,
IEqualityComparer <TKey> comparer,
CancellationToken token = default)
=> AsyncExtensions.ToDictionaryAsync(source.ToLinqToDB(), keySelector, elementSelector, comparer, token);
/// <inheritdoc cref="AsyncExtensions.ToDictionaryAsync{TSource, TKey, TElement}(IQueryable{TSource}, Func{TSource, TKey}, Func{TSource, TElement}, CancellationToken)"/>
public static Task <Dictionary <TKey, TElement> > ToDictionaryAsyncLinqToDB <TSource, TKey, TElement>(
this IQueryable <TSource> source,
Func <TSource, TKey> keySelector,
Func <TSource, TElement> elementSelector,
CancellationToken token = default)
where TKey : notnull
=> AsyncExtensions.ToDictionaryAsync(source.ToLinqToDB(), keySelector, elementSelector, token);