/// <inheritdoc cref="AsyncExtensions.SumAsync(IQueryable{decimal?}, CancellationToken)"/>
public static Task <decimal?> SumAsyncLinqToDB(
this IQueryable <decimal?> source,
CancellationToken token = default)
=> AsyncExtensions.SumAsync(source.ToLinqToDB(), token);
/// <inheritdoc cref="AsyncExtensions.SumAsync{TSource}(IQueryable{TSource}, Expression{Func{TSource, int}}, CancellationToken)"/>
public static Task <int> SumAsyncLinqToDB <TSource>(
this IQueryable <TSource> source,
Expression <Func <TSource, int> > selector,
CancellationToken token = default)
=> AsyncExtensions.SumAsync(source.ToLinqToDB(), selector, token);
/// <summary>
/// Computes the sum of the sequence that is obtained
/// by invoking a projection function on each element of the input sequence
/// </summary>
/// <typeparam name="TSource">The type of the elements of source</typeparam>
/// <param name="source">A sequence of values of type TSource</param>
/// <param name="predicate">A projection function to apply to each element</param>
/// <returns>
/// A task that represents the asynchronous operation
/// The task result contains the sum of the projected values
/// </returns>
public static Task <float> SumAsync <TSource>(this IQueryable <TSource> source,
Expression <Func <TSource, float> > predicate)
{
return(AsyncExtensions.SumAsync(source, predicate));
}