Below is a logic to extract value from string.
I am wondering is it possible to run with Linq statement.
Any hint?
string r = "#1:234.1;#2:2344.2:#3:38.0";
List<double> v = new List<double>();
foreach (var x in r.Split(';'))
{
foreach (var y in x.Split(':'))
{
if (string.IsNullOrWhiteSpace(y) == false && y.StartsWith("#") == false)
{
v.Add(double.Parse(y));
}
}
}
Console.WriteLine(string.Join("\n", v.ToArray()));
This is the equivalent code in Linq form
var v = r.Split(';')
.SelectMany(x => x.Split(':'))
.Where(x => !string.IsNullOrWhiteSpace(x) && !x.StartsWith("#"))
.Select(double.Parse)
.ToList();
I used this code to search among the site's products and all the fields in the database have indexes but the loading speed is very low.
The higher the number of results found, the slower the speed and the user has to wait for about 15 seconds
This part of the code finds data that is searched with words and in another function the filters are clearly applied
public List<Product> AutoCompleteProductList(string term = "")
{
string[] words = term.Split(' ');
List<SearchResult> v = new List<SearchResult>();
List<int> temp = new List<int>();
if (!String.IsNullOrEmpty(term))
{
foreach (var text in words)
{
temp.Clear();
temp = db.Products.Where(p => p.Product_Name.Contains(text)
|| p.Product_English_Name.Contains(text)
|| p.Product_ID.ToString() == text
|| p.Product_Short_Info.Contains(text)
|| p.Product_Tag.Contains(text)).Where(a => a.Product_Status).OrderByDescending(a => a.Product_ID).Select(r => r.Product_ID).ToList();
foreach (var item in temp)
{
SearchResult SearchResultTemp = v.FirstOrDefault(e => e.Product_ID == item);
if (SearchResultTemp != null)
{
SearchResultTemp.Count += 1;
v.RemoveAt(v.IndexOf(SearchResultTemp));
v.Add(SearchResultTemp);
}
else
{
v.Add(new SearchResult
{
Product_ID = item,
Count = 1
});
}
}
}
}
List<int> end = v.OrderByDescending(e => e.Count).Select(e => e.Product_ID).ToList();
List<Product> routeList = new List<Product>();
foreach (var item in end)
{
Product p = db.Products.Find(item);
routeList.Add(p);
}
return routeList;
}
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
I try to get a list of all innermost tables with AngleSharp. This tables doesn't contain any tables.
With HtmlAgilityPack I've realised it this way:
var wrapper = html.DocumentNode.SelectSingleNode(".//td[#class='wrapper']");
var innerMostTables = wrapper.SelectNodes(".//table [not(descendant::table)]");
With AngleSharp I've tried this, but it doesn't work:
var parser = new HtmlParser();
var document = parser.Parse(html);
var wrapper = document.All.Where(d => d.ClassName == "wrapper");
var innerMostTables = wrapper.Where(w => w.Descendents()
.Select(c => c.NodeName == "table").Count() == 0);
I could solve the problem:
foreach (IElement ch in wrapper.Descendents()
.Where(d => d.NodeName == "TABLE" && d.Descendents()
.Where(d2 => d2.NodeName == "TABLE").Count() == 0))
{
Console.WriteLine(ch.OuterHtml);
}
I am having a hard time solving this problem, need code for creating a dynamic linq query in C#, asp.net. I have 5 dropdown list that searches different column in same database table and return item filtered value to a single listbox. The problem is there is no sequence that which or all or any will be selected in DDLs but the combined filtered result should show up in listbox. I have a working query that is searching and returning result in one column at a time for each DDL selection separately. Have to add where clauses with AND to add other DDL selections dynamically to this query. Thanks
public ListItemCollection searchProject(ListItemCollection projList, String searchstr, String columnName)
{
DataSet DSToReturn = new DataSet();
ListItemCollection returnItems = new ListItemCollection();
DataTable results = (from d in ((DataSet)_MyDataset).Tables["Records"].AsEnumerable()
orderby d.Field<string>("Name") ascending
where (d.Field<string>(columnName) != null)
where d[columnName].ToString().ToLower().Contains(searchstr.ToLower())
select d).CopyToDataTable();
foreach (ListItem li in projList)
{
if ((from System.Data.DataRow row in results.Rows
where li.Value.Equals(row["value"].ToString(), StringComparison.InvariantCultureIgnoreCase)
select row["value"]).Count() > 0)
returnItems.Add(li);
}
return returnItems;
}
Here's some example code for how we do it ...
private void DataPortal_Fetch(GoalCriteria criteria)
{
using (var ctx = ContextManager<Data.ExodusDataContext>
.GetManager(Database.ApplicationConnection, false))
{
this.RaiseListChangedEvents = false;
this.IsReadOnly = false;
// set option to eager load child object(s)
var opts = new System.Data.Linq.DataLoadOptions();
opts.LoadWith<Data.Goal>(row => row.Contact);
opts.LoadWith<Data.Goal>(row => row.Sales);
opts.LoadWith<Data.Goal>(row => row.Customer);
ctx.DataContext.LoadOptions = opts;
IQueryable<Data.Goal> query = ctx.DataContext.Goals;
if (criteria.Name != null) // Name
query = query.Where(row => row.Name.Contains(criteria.Name));
if (criteria.SalesId != null) // SalesId
query = query.Where(row => row.SalesId == criteria.SalesId);
if (criteria.Status != null) // Status
query = query.Where(row => row.Status == (int)criteria.Status);
if (criteria.Statuses.Count != 0) // Statuses
query = query.Where(row => criteria.Statuses.Contains((GoalStatus)row.Status));
if (criteria.ContactId != null) // ContactId
query = query.Where(row => row.ContactId == criteria.ContactId);
if (criteria.CustomerId != null) // CustomerId
query = query.Where(row => row.CustomerId == criteria.CustomerId);
if (criteria.ScheduledDate.DateFrom != DateTime.MinValue) // ScheduledDate
query = query.Where(t => t.ScheduledDate >= criteria.ScheduledDate.DateFrom);
if (criteria.ScheduledDate.DateTo != DateTime.MaxValue)
query = query.Where(t => t.ScheduledDate <= criteria.ScheduledDate.DateTo);
if (criteria.CompletedDate.DateFrom != DateTime.MinValue) // ComplatedDate
query = query.Where(t => t.CompletedDate >= criteria.CompletedDate.DateFrom);
if (criteria.CompletedDate.DateTo != DateTime.MaxValue)
query = query.Where(t => t.CompletedDate <= criteria.CompletedDate.DateTo);
if (criteria.MaximumRecords != null) // MaximumRecords
query = query.Take(criteria.MaximumRecords.Value);
var data = query.Select(row => GoalInfo.FetchGoalInfo(row));
this.AddRange(data);
this.IsReadOnly = true;
this.RaiseListChangedEvents = true;
}
}
We just check for a null value assigned to our criteria object, if it's not null then we append it to the query.