public static Task <T> FirstOrDefaultAsync <T>(this IQueryable <T> source, Expression <Func <T, bool> > predicate)
{
if (IsInUnitTest)
{
return(Task.FromResult(source.FirstOrDefault(predicate)));
}
return(QE.FirstOrDefaultAsync(source, predicate));
}
public static Task <T> FirstOrDefaultAsync <T>(this IQueryable <T> source)
{
if (IsInUnitTest)
{
return(Task.FromResult(source.FirstOrDefault()));
}
return(QE.FirstOrDefaultAsync(source));
}
public static Task <T> FirstOrDefaultAsync <T>(this IQueryable <T> source, Expression <Func <T, bool> > predicate)
where T : class
{
if (source is EntitySet <T> )
{
source = (source as EntitySet <T>).DbSet;
}
return(Extensions.FirstOrDefaultAsync(source, predicate));
}
public static async Task <T> FirstOrDefaultAsync <T>(this IQueryable <T> source, Expression <Func <T, bool> > predicate)
where T : class
{
if (predicate == null)
{
throw new ArgumentNullException($"The {nameof(predicate)} can not be null.");
}
if (source is EntitySet <T> )
{
source = (source as EntitySet <T>).DbSet;
}
T result = await Extensions.FirstOrDefaultAsync(source, predicate).ConfigureAwait(continueOnCapturedContext: false);
return(result);
}