public static Task <bool> AnyAsync <TSource>(
[NotNull] this IQueryable <TSource> source,
[NotNull] Expression <Func <TSource, bool> > predicate,
CancellationToken cancellationToken = default(CancellationToken))
{
Check.NotNull(source, "source");
Check.NotNull(predicate, "predicate");
cancellationToken.ThrowIfCancellationRequested();
var provider = source.Provider as IAsyncQueryProvider;
if (provider != null)
{
return(provider.ExecuteAsync <bool>(
Expression.Call(
null,
_anyPredicate.MakeGenericMethod(typeof(TSource)),
new[] { source.Expression, Expression.Quote(predicate) }
),
cancellationToken));
}
throw new InvalidOperationException(Strings.FormatIQueryableProviderNotAsync());
}
public static Task <int> SumAsync(
[NotNull] this IQueryable <int> source,
CancellationToken cancellationToken = default(CancellationToken))
{
Check.NotNull(source, "source");
var provider = source.Provider as IAsyncQueryProvider;
if (provider != null)
{
return(provider.ExecuteAsync <int>(
Expression.Call(
null,
_sumInt,
new[] { source.Expression }
),
cancellationToken));
}
throw new InvalidOperationException(Strings.FormatIQueryableProviderNotAsync());
}
public static Task <int> CountAsync <TSource>(
[NotNull] this IQueryable <TSource> source,
CancellationToken cancellationToken = default(CancellationToken))
{
Check.NotNull(source, "source");
cancellationToken.ThrowIfCancellationRequested();
var provider = source.Provider as IAsyncQueryProvider;
if (provider != null)
{
return(provider.ExecuteAsync <int>(
Expression.Call(
null,
_count.MakeGenericMethod(typeof(TSource)),
new[] { source.Expression }),
cancellationToken));
}
throw new InvalidOperationException(Strings.FormatIQueryableProviderNotAsync());
}
