How to use and display PagedResultDto - aspnetboilerplate

Using ASPNet Boilerplate, and returning a pagedResultSetDto with the below code, how do I display the page links?
public PagedResultDto<ArticleDto> GetAll()
{
var articleCount = articleRepository.Count();
var t = articleRepository.GetAllIncluding(x => x.articleImage).Include(x => x.Category).Where(
x => x.PublishFrom <= DateTime.Now &&
x.PublishTo >= DateTime.Now &&
x.Status == PostStatus.Published &&
x.IsDeleted == false
).OrderByDescending(x=> x.PublishFrom).ToList();
return new PagedResultDto<ArticleDto>
{
TotalCount = articleCount,
Items = t.MapTo<List<ArticleDto>>()
};
}

First, take in IPagedResultRequest as input:
// using Abp.Linq.Extensions;
public PagedResultDto<ArticleDto> GetAll(PagedResultRequestDto input)
{
var articleCount = articleRepository.Count();
var t = articleRepository
.GetAllIncluding(x => x.articleImage)
.Include(x => x.Category)
.Where(x =>
x.PublishFrom <= DateTime.Now &&
x.PublishTo >= DateTime.Now &&
x.Status == PostStatus.Published &&
x.IsDeleted == false
)
.OrderByDescending(x => x.PublishFrom)
.PageBy(input) // Page by SkipCount and MaxResultCount
.ToList();
return new PagedResultDto<ArticleDto>
{
TotalCount = articleCount,
Items = t.MapTo<List<ArticleDto>>()
};
}
Then create your own links to pass in SkipCount, e.g. GetAll?SkipCount=10 for page 2.
MaxResultCount has a default value of 10.

You can calculate it according to the result of GetAll().
You request how many records you want. Let's say 10 (default value).
It returns TotalCount and Items (=records). Let's say TotalCount = 95. Divide 95/10 = 9.5 ~=> 10 pages. Show 10 links. While 9 pages will show 10 records, last page will have 5 records. That

Related

LinqKit Core PredicateBuilder not functioning correctly

I have this query:
var query = LinqKit.PredicateBuilder.New<Resume>();
if (selectedWorkFieldID != 0)
{
query = query.And(js => js.WorkFieldID == selectedWorkFieldID);
if (!(selectedJobIDs.Contains(0) && selectedJobIDs.Count() == 1))
{
foreach (int jobID in selectedJobIDs)
query = query.Or(js => js.JobID == jobID);
}
}
var finalQuery = context.Resumes.AsNoTracking().Include(r => r.ResumeSkills)
.ThenInclude(rs => rs.Skill).Include(r => r.JobSeeker).ThenInclude(r => r.Profile)
.AsExpandable().Where(query);
count = finalQuery.Count();
resumes = finalQuery.Skip(args.Skip.Value).Take(args.Top.Value).ToList<Resume>();
This query returns All resumes not filtered ones. When I debug, the debugger curser enters the foreach block that filters with or, and there is one jobID in selectedJobIDs but the query returns all resumes. it seems the predicate builder not working at all. How to solve this?
I changed code to this:
if (selectedWorkFieldID != 0)
{
query = query.And(js => js.WorkFieldID == selectedWorkFieldID);
if (!(selectedJobIDs.Contains(0) && selectedJobIDs.Count() == 1))
{
var query2 = LinqKit.PredicateBuilder.New<Resume>();
foreach (int jobID in selectedJobIDs)
query2 = query2.Or(js => js.JobID == jobID);
query.And(query2);
}
}
and it is corrected.

How to do a cascading IGrouping?

I'm trying to do a cascading groupby, but I can't find a way to get the proper index in the end (the .ElementAt(0) in the end of the code is wrong, in all 3 levels of hierarchy).
//Level
//---|Category
//---|---|Family
//---|---|---|Type
//---|---|---|---|Leaf
var leafs = queryLeafs.ToList();
foreach (var leaf in leafs)
{
//Get Type
var leafAttr = leaf.ObjectsEav.First(eav => eav.Attribute.Name == "parent");
long typeId = leafAttr.Value.Value;
leaf.Type = universe.First(o => o.Id == typeId);
//Family
var typeAttr = leaf.Type.ObjectsEav.First(eav => eav.Attribute.Name == "parent");
long familyId = typeAttr.Value.Value;
leaf.Family = universe.First(o => o.Id == familyId);
//Category
var familyAttr = leaf.Family.ObjectsEav.First(eav => eav.Attribute.Name == "parent");
long categoryId = familyAttr.Value.Value;
leaf.Category = universe.First(o => o.Id == categoryId);
}
var groupType = leafs.GroupBy(leaf => leaf.Type);
var groupFamily = groupType.GroupBy(t => **t.ElementAt(0)**.Family);
var groupCategory = groupFamily.GroupBy(f => **f.ElementAt(0).ElementAt(0)**.Category);
Can someone provide a light in my dark path?
If you have any suggestion on how to improve this question, I would appreciate with all my heart.

LINQ: query very slow

I have the following database structure (just showing the pertinent tables):
I need to get a listing of all the elements in the table "Propietario" and each element must have a list of all its related elements in "Clave". Specifically, I need the field "CodigoClave" from "Clave".
Also, I need to be able to filter the results any of the fields.
This is what I've come up with so far:
int pageSizeP = (pageSize == null || pageSize == 0 || pageSize > 15) ? 15 : (int)pageSize;
int pageNumberP = (pageNumber == null || pageNumber == 0) ? 1 : (int)pageNumber;
var propietariosCount = context.Propietarios.Count();
var propietariosQuery = context.Propietarios
.AsEnumerable()
.OrderBy(p => p.Nombre).ThenBy(p => p.Apellido1).ThenBy(p => p.Apellido2)
.Select(p => new
{
Id = p.Id,
Nombre = p.Nombre,
Apellido1 = p.Apellido1,
Apellido2 = p.Apellido2,
NIF = p.NIF,
Claves = string.Join(", ", context.PropietariosFincas
.Where(pf => pf.PropietarioId == p.Id)
.Join(context.Expedientes
.Include(e => e.Clave),
pf => pf.FincaId,
e => e.FincaId,
(pf, e) => (e.Clave.CodigoClave + ((e.Clave.Alias == null) ? "" : " - " + e.Clave.Alias))
).Distinct().ToList())
// Getting an array of Claves would do;
// I could turn it into a string in the JS app
// But it's just as slow
});
if (criteriosBusqueda != "")
{
string[] aCriterios = criteriosBusqueda.Split(new string[] { "," }, StringSplitOptions.None);
CompareOptions compareOptions = CompareOptions.IgnoreCase;
if (aCriterios[0] != "")
propietariosQuery = propietariosQuery
.Where(p => p.Nombre != null)
.Where(p => p.Nombre.Replace("/", "__").ContainsIgnoreAccents(aCriterios[0], compareOptions));
if (aCriterios[1] != "")
propietariosQuery = propietariosQuery
.Where(p => p.Apellido1 != null)
.Where(p => p.Apellido1.Replace("/", "__").ContainsIgnoreAccents(aCriterios[1], compareOptions));
if (aCriterios[2] != "")
propietariosQuery = propietariosQuery
.Where(p => p.Apellido2 != null)
.Where(p => p.Apellido2.Replace("/", "__").ContainsIgnoreAccents(aCriterios[2], compareOptions));
if (aCriterios[3] != "")
propietariosQuery = propietariosQuery
.Where(p => p.NIF != null)
.Where(p => p.NIF.Replace("/", "__").ToLower().Contains(aCriterios[3].ToLower()));
if (aCriterios[4] != "")
propietariosQuery = propietariosQuery
.Where(p => p.Claves != null)
.Where(p => p.Claves.Replace("/", "__").ToLower().Contains(aCriterios[4].ToLower()));
}
var propietariosList = propietariosQuery.Skip((pageNumberP - 1) * pageSizeP).Take(pageSizeP)
.ToList();
var datosPropietarios = new
{
pageSize = pageSizeP,
pageNumber = pageNumberP,
recordsNumber = propietariosQuery.Count()
titulares = propietariosList
};
return Ok(datosPropietarios);
It works, but it's too slow (it takes several minutes). I've managed to make the initial query (the first page, unfiltered) fast by making recordsNumber = context.Propietarios.Count() but that breaks the pagination when filtering. And anyway, if I filter or if I go to a page near the end, it is again really slow.
How can I make the query faster?
My guess is that the query is pretty much traversing all the tables, so I don't know if there's even a solution that doesn't involve changing the data model.
It's because you are calling AsEnumerable, you are fetching all the data from Propietarios table to memory and the rest of operations you do after you call that method are executed using Linq to Objects instead of Linq to Entities, so your query is not translated to sql. Try removing it
Take a look of this post in case you need more info how AsEnumerable works with EF

Cannot convert from IEnumerable<List> to List

I am working on these lists to get an item that matches the selected item from the combobox.
private void InitializaMessageElement()
{
if (_selectedTransactionWsName != null)
{
get a transaction webservice name matching the selected item from the drop down here the output=TestWS which is correct
var getTranTypeWsName = TransactionTypeVModel
.GetAllTransactionTypes()
.FirstOrDefault(transTypes =>
transTypes.WsMethodName == _selectedTransactionWsName);
Loop the list of wsnames from the treenode list. Here it gives me all the node I have which is correct.
var wsNameList = MessageElementVModel
.GetAllTreeNodes().Select(ame =>
ame.Children).ToList();//. == getTranTypeWsName.WsMethodName);
find the getTranTypeWsName.WsMethodName in the wsNameList. Here is where I have the problem:
var msgElementList = MessageElementVModel.GetAllTreeNodes()
.Select(ame => ame.Children).Where(c =>
{
c.Where(d => getTranTypeWsName != null && d.Name == getTranTypeWsName.WsMethodName);
return false;
});
my MsgElement list:
var _msgElementList = new ObservableCollection<MessageElementViewModel>(msgElementList);
this.messageElements = _msgElementList;
NotifyPropertyChanged("MessageElements");
}
Here it is returning wrong data. It returns all the list I have a non filtered one.
Why is my out put inconsistent? I am new to LINQ.
This part of your code seems problematic:
var msgElementList = wsNameList.SingleOrDefault(x =>
{
x.Where(ame => ame.Name == getTranTypeWsName.WsMethodName);
return true;
});
You were expecting a list but you used the SingleOrDefault(), which is meant to be used in retrieving a single record.
Try this, which will retrieve msgElementList. No need to get all tree nodes first and store it in wsNameList:
// Assumed that Name is a property of Children
var msgElementList = MessageElementVModel.GetAllTreeNodes()
.Select(ame => ame.Children).Where(c => c.Name == getTranTypeWsName.WsMethodName).ToList();
Here is a solution:
var msgElementList = wsNameList.SelectMany(x => x.Where(ame => getTranTypeWsName != null && ame.Name == getTranTypeWsName.WsMethodName)).ToList();

Entity fails on simulataneous AJAX posts

I have an action that updates the database based on a Jquery Droppable/Sortable. The first AJAX post works fine, but the second one gives me the error:
New transaction is not allowed because there are other
threads running in the session.
It's being posted to 2 separate actions on the same controller, using the same UnitOfWork in the controller. Not sure what I have to do to fix this.
EDIT: these are the two service methods being called:
public void NavItemSort(List<string> orderArray, string navID, string subNavID)
{
var newOrderArray = orderArray.Where(s => !string.IsNullOrWhiteSpace(s)).ToList();
var orderArrayIDs = newOrderArray.Select(x => x.Replace("ContentItem", "")).ToList();
var itemToBeSorted = Convert.ToInt32(orderArrayIDs.FirstOrDefault());
var itemContext = cmsUnitOfWork.NavigationItems.Find().Where(x => x.ID == itemToBeSorted).ToList().FirstOrDefault();
var currentSortOrder = cmsUnitOfWork.NavigationItems.Find()
.Where(x => x.NavID == itemContext.NavID &&
(itemContext.ParentID == null) ? x.ParentID == null :
x.ParentID == itemContext.ParentID).ToList();
var existingItems = currentSortOrder.Select(x => x.ID).ToList();
List<string> existingItemsString = existingItems.ConvertAll<string>(x => x.ToString()).ToList();
var newNavItemID = existingItemsString.Except(orderArray).FirstOrDefault();
var currentSortOrderExcept = currentSortOrder.Where(x => x.ID != Convert.ToInt32(newNavItemID));
foreach (var x in currentSortOrderExcept)
{
int sortOrderInt = orderArrayIDs.IndexOf(orderArrayIDs.Where(z => int.Parse(z) == x.ID).ToList().FirstOrDefault()) + 1;
NavigationItem navigationItem = new NavigationItem()
{
HasChild = x.HasChild,
Level = x.Level,
NavID = x.NavID,
ID = x.ID,
ParentID = x.ParentID,
PageID = x.PageID,
URL = x.URL,
Title = x.Title,
SortOrder = sortOrderInt,
};
if (navigationItem.SortOrder != null && navigationItem.SortOrder != 0)
{
cmsUnitOfWork.NavigationItems.Update(x, navigationItem);
}
}
cmsUnitOfWork.Commit();
}
public void NavItemAdd(List<string> orderArray, string NavID, string subNavID){
var newOrderArray = orderArray.Where(s => !string.IsNullOrWhiteSpace(s)).ToList();
var orderArrayIDs = newOrderArray.Select(x => x.Replace("ContentItem", "")).ToList();
NavID = NavID.Replace("nav", "");
int NavIDInt = int.Parse(NavID);
int subNavIDInt = int.Parse(subNavID);
var existingNavItems = cmsUnitOfWork.NavigationItems.Find().Where(x => x.NavID == NavIDInt && x.ParentID == subNavIDInt).ToList();
int currentSortOrder = 0;
if (existingNavItems.Count() != 0)
{
currentSortOrder = existingNavItems.Max(x => x.SortOrder);
}
var existingItems = existingNavItems.Select(x => x.ID).ToList();
List<string> existingItemsString = existingItems.ConvertAll<string>(x => x.ToString()).ToList();
var newNavItemID = orderArray.Except(existingItemsString).FirstOrDefault();
int newNavIDInt = int.Parse(newNavItemID);
var newNavItemList = cmsUnitOfWork.NavigationItems.Find().Where(x => x.ID == newNavIDInt).ToList();
var newNavItem = newNavItemList.FirstOrDefault();
var parentNav = cmsUnitOfWork.NavigationItems.Find().Where(x => x.ID == subNavIDInt).ToList().FirstOrDefault();
NavigationItem navigationItemUpdated = new NavigationItem()
{
ID = newNavItem.ID,
Level = 2,
NavID = NavIDInt,
PageID = newNavItem.PageID,
Title = newNavItem.Title,
URL = newNavItem.URL,
ParentID = subNavIDInt,
SortOrder = currentSortOrder + 1
};
cmsUnitOfWork.NavigationItems.Update(newNavItem, navigationItemUpdated);
cmsUnitOfWork.Commit();
}
I'm guessing you started a transaction against that context and you never dispose of it not commit it. Just a guess though as you didn't Los any code (please post code)
Maybe you have declared cmsUnitOfWork as static variable? Context must be created and destroyed on each request

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