FindPostComments(this IDataFacade dataFacade, int postId)
{
if (dataFacade == null)
{
throw new ArgumentNullException(nameof(dataFacade));
}
// 获取所有一级评论
var indexEntitiesLv1 = await dataFacade.Comments
.Where(e => e.PostId == postId && e.IsRemoved == false)
.ToListAsync();
var contentEntitiesLv1 = await dataFacade.FindCommentContentEntities(
indexEntitiesLv1.Select(e => new ObjectId(e.ContentId)));
var indexEntitiesLv2 = new List <CommentEntity>();
var contentEntitiesLv2 = new List <CommentContentEntity>();
foreach (var entityLv1 in indexEntitiesLv1)
{
// 获取当前枚举到的一级评论下的所有二级评论
var indexEntitiesLv2Current = await dataFacade.Comments
.Where(e => e.CommentId == entityLv1.Id &&
e.IsRemoved == false)
.ToListAsync();
var contentEntitiesLv2Current = await dataFacade.FindCommentContentEntities(
indexEntitiesLv2Current.Select(e => new ObjectId(e.ContentId)));
indexEntitiesLv2.AddRange(indexEntitiesLv2Current);
contentEntitiesLv2.AddRange(contentEntitiesLv2Current);
}
// 将一级评论与二级评论进行扁平化处理
var indexEntities = indexEntitiesLv1;
indexEntities.AddRange(indexEntitiesLv2);
var contentEntities = contentEntitiesLv1;
contentEntitiesLv1.AddRange(contentEntitiesLv2);
return(indexEntities.Zip(contentEntities, (ie, ce) => (ie, ce))
.ToList());
}
FindUserComments(this IDataFacade dataFacade, int userId)
{
if (dataFacade == null)
{
throw new ArgumentNullException(nameof(dataFacade));
}
var indexEntities = await dataFacade.Comments
.Where(e => e.AuthorId == userId && e.IsRemoved == false)
.ToListAsync();
var contentEntities = await dataFacade.FindCommentContentEntities(
indexEntities.Select(e => new ObjectId(e.ContentId)));
return(indexEntities.Zip(contentEntities, (ie, ce) => (ie, ce))
.ToList());
}