public static IQueryable <Post> Filtering(this IQueryable <Post> posts, PostListCriterion criterion)
{
if (criterion.FilterBy == null)
{
return(posts);
}
switch (criterion.FilterBy)
{
case FilterBy.Title:
if (criterion.ExactMatch)
{
posts = posts.Where(x => string.Compare(x.Title, criterion.SearchText) == 0);
}
else
{
posts = posts.Where(x => x.Title.Contains(criterion.SearchText));
}
break;
case FilterBy.Author:
if (criterion.ExactMatch)
{
posts = posts.Where(x => string.Compare(x.UserProfile.Username, criterion.SearchText) == 0);
}
else
{
posts = posts.Where(x => x.UserProfile.Username.Contains(criterion.SearchText));
}
break;
}
return(posts);
}
public async Task <IEnumerable <PostPreviewDTO> > GetPostsAsync(PostListCriterion criterion)
{
if (criterion == null)
{
criterion = new PostListCriterion();
}
return(await Task.Run(() =>
_dataStore.Posts.GetAll()
.Filtering(criterion)
.Sorting(criterion)
.Paging(criterion.PageNumber, criterion.PageSize)
.Select(x => x.GetDTO())));
}
public static IQueryable <Post> Sorting(this IQueryable <Post> posts, PostListCriterion criterion)
{
switch (criterion.SortingBy)
{
case SortingBy.Newer:
return(posts.OrderByDescending(x => x.Date));
case SortingBy.Older:
return(posts.OrderBy(x => x.Date));
case SortingBy.Popular:
return(posts.OrderByDescending(x => x.Visits));
}
return(posts);
}
