/// <summary>
/// Returns the number of elements in a sequence.
/// </summary>
/// <typeparam name="TSource">The type of the elements of source.</typeparam>
/// <param name="source">The sequence that contains the elements to be counted.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The number of elements in the input sequence.</returns>
public static Task <Response <int> > CountAsync <TSource>(
this IQueryable <TSource> source,
CancellationToken cancellationToken = default(CancellationToken))
{
CosmosLinqQueryProvider cosmosLinqQueryProvider = source.Provider as CosmosLinqQueryProvider;
if (cosmosLinqQueryProvider == null)
{
return(ResponseHelperAsync(source.Count()));
}
return(cosmosLinqQueryProvider.ExecuteAggregateAsync <int>(
Expression.Call(
GetMethodInfoOf <IQueryable <TSource>, int>(Queryable.Count),
source.Expression),
cancellationToken));
}
/// <summary>
/// Computes the sum of a sequence of <see cref="Int32" /> values.
/// </summary>
/// <param name="source">A sequence of values to calculate the average of.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The average value in the sequence.</returns>
public static Task <int> SumAsync(
this IQueryable <int> source,
CancellationToken cancellationToken = default(CancellationToken))
{
CosmosLinqQueryProvider cosmosLinqQueryProvider = source.Provider as CosmosLinqQueryProvider;
if (cosmosLinqQueryProvider == null)
{
return(Task.FromResult(source.Sum()));
}
return(cosmosLinqQueryProvider.ExecuteAggregateAsync <int>(
Expression.Call(
GetMethodInfoOf <IQueryable <int>, int>(Queryable.Sum),
source.Expression),
cancellationToken));
}
/// <summary>
/// Computes the sum of a sequence of <see cref="Nullable{Int64}" /> values.
/// </summary>
/// <param name="source">A sequence of values to calculate the average of.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The average value in the sequence.</returns>
public static Task <Response <long?> > SumAsync(
this IQueryable <long?> source,
CancellationToken cancellationToken = default(CancellationToken))
{
CosmosLinqQueryProvider cosmosLinqQueryProvider = source.Provider as CosmosLinqQueryProvider;
if (cosmosLinqQueryProvider == null)
{
return(ResponseHelperAsync(source.Sum()));
}
return(cosmosLinqQueryProvider.ExecuteAggregateAsync <long?>(
Expression.Call(
GetMethodInfoOf <IQueryable <long?>, long?>(Queryable.Sum),
source.Expression),
cancellationToken));
}
/// <summary>
/// Computes the average of a sequence of <see cref="Nullable{Int64}" /> values.
/// </summary>
/// <param name="source">A sequence of values to calculate the average of.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The average value in the sequence.</returns>
public static Task <double?> AverageAsync(
this IQueryable <long?> source,
CancellationToken cancellationToken = default(CancellationToken))
{
CosmosLinqQueryProvider cosmosLinqQueryProvider = source.Provider as CosmosLinqQueryProvider;
if (cosmosLinqQueryProvider == null)
{
return(Task.FromResult(source.Average()));
}
return(cosmosLinqQueryProvider.ExecuteAggregateAsync <double?>(
Expression.Call(
GetMethodInfoOf <IQueryable <long?>, double?>(Queryable.Average),
source.Expression),
cancellationToken));
}
