ADO.NET :: How To Alphabetise The Results From A Linq To Sql Query
Jan 26, 2011
I can't seem to change the order of the results coming back from a linq to sql query, I want just to return the distinct values from the field x.manufacturer in alphabetical order, this is what I have and it isn't working:
public IQueryable<string> Dropone()
{
return (from x in CAT.CatalogueDatas
where x.Parent == null
orderby x.Manufacturer
select x.Manufacturer).Distinct();
}
Currently I get the distinct values in non-alphabetical order, in fact I'm not sure what order they're coming out in, don't think it's the order in which they appear though.
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Similar Messages:
Mar 5, 2011
I have a query using LINQ-to-SQL. It queries an underlying database table Rooms. It uses Where conditions to narrow down the results, namely:
Gender.
Current Occupancy < Max Occupancy
Available Flag is Checked
I know this should return results but it keeps returning an empty set. Any ideas? Code is below
Dim selectedHalls = (From sh In dbHalls.Rooms _
Where sh.gender = Session("gender").ToString _
Where sh.max_occupancy > sh.current_occupancy _
Where sh.is_available = 1 _
Select sh.building_name).Distinct()
UPDATE: I've verified that the issue is with the statement where sh.is_available = 1, which doesn't make sense since this is a bit field.
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Jan 23, 2010
I have this LINQ query:
var agnts = (from a in db.agents select new { a.userid, a.name }).Take(10);
How can I get randomly get 10 records from my agents table?
I have tried:
agnts = agnts.OrderBy(n => Guid.NewGuid());
but this doesn't seem to do anything.
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Feb 13, 2014
I have a array list and am using like a database trying to search for ChildID and ParentID based on certain criteria.
My example below has the following keywords to search for:
Yellow, Mustard, Honey, Orange, Flame, Talisman
I also have a category volume value which I grab the first 2 characters to determine another filter.
My code isn't returning all matches with using 'Contains'. Right now it finds the 'Orange, Flame, Talisman'/AV record and returns 50, 28. My keywords also has 'Yellow, Mustard, Honey'/AV which should return 55 and 28 as well.
HTML Code:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="temp2.aspx.vb" Inherits="temp2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
[Code] ....
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Apr 29, 2010
[Code]....
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace find.Admin
{
public partial
class WebForm1 : System.Web.UI.Page
{
private
class servicetimeofday
{
public int servicetimeofdayid {
get; set; }
public int serviceid {
get; set; }
public int timeofdayid {
get; set; }
}
protected void Page_Load(object sender,
EventArgs e
{
List<servicetimeofday> servicetimesofday =
new
List<servicetimeofday>
{
new servicetimeofday() { servicetimeofdayid = 1, serviceid = 1, timeofdayid = 1 },
new servicetimeofday() { servicetimeofdayid = 2, serviceid = 1, timeofdayid = 2 },
new servicetimeofday() { servicetimeofdayid = 3, serviceid = 2, timeofdayid = 1 },
new servicetimeofday() { servicetimeofdayid = 4, serviceid = 2, timeofdayid = 3 }
};
GridView2.DataSource = servicetimesofday;
GridView2.DataBind();
var itemstocheck = from
servicetimeofday in servicetimesofday
where servicetimeofday.serviceid == 2
select ne
servicetimeofday.timeofdayid
};
GridView3.DataSource = itemstocheck;
GridView3.DataBind();
foreach (var timeofdayid
in itemstocheck)
{
foreach (ListItem i
in CheckBoxList2.Items)
{
if (i.Value == timeofdayid.ToString())
{ i.Selected =
true; }
}
}
}
}
}
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May 28, 2010
I'm looking to translate an SQL query into linq
INNER JOIN Usrs ON
SAQ.UserId =
Usrs.UserId AND Scan.UserId =
Users.UserId
I'm not sure how to include the "AND" in the LINQ statement.
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Feb 11, 2011
I want to use "if statement" in Linq query. How can I do this situation?
For example:
if txtAge.Text=="", I will not use that in Linq Query.
else txtAge.Text!="", I will use that in Linq Query.
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Sep 14, 2010
I've build a linq query.But i want a random selection so its not always ID : 1,2,3,4,5,6 How can i randomize this var? I like to bind it to a repeater.//TagCloud:
Random rand = new Random();
var tc1 = from i in JumpTide.cms.menu.GetMenuItems(32)
select new
[code]...
View 1 Replies
Mar 10, 2010
select Groupid,GroupName,onorusername from palgroup where groupid in (select distinct Groupid
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Nov 12, 2010
I have a dropdown filtering the results of a DataGrid it´s working fine, but I select a city to filter the results in the DataGrid it brings me
all the cities in the database and not only the ones in the DataGrid....
I donpt know what property to use.....
Here I have the Dropdown in the code behind:
[Code]....
and here is here I´m filtering ....
[Code]....
What should i do to bring the results in the datagrid ??
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Mar 17, 2011
datacontextclass dc=new datacontextclass ();
var news= dc.GetNewsCompany(Int64.Parse ( _idCompany));
if (news.GetEnumerator().MoveNext())
{
foreach (var item in news)
{
drpListNews.Items.Add(item.Title);
}
}
return error:{"The query results cannot be enumerated more than once."}
how can check result != null in LINQ;
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Mar 19, 2011
I am facing a big problem with simple linq query.. I am using EF 4.0..
I am trying to take all the records from a table using a linq query:
var result = context.tablename.select(x=>x);
This results in less rows than the normal sql query which is select * from tablename;
This table has more than 5 tables as child objects (foreign key relations: one to one and one to many etc)..
This result variable after executing that linq statement returns records with all child object values without doing a include statement.. I don't know is it a default behavior of EF 4.0 . I tried this statement in linqpad also..but there is no use... But interesting thing is if I do a join on the same table with another one table is working same is sql inner join and count is same..but I don't know why is it acting differently with that table only.. Is it doing inner joins with all child tables before returning the all records of that parent table?
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Oct 17, 2010
I am writing a linq query to select a blogpost,
[code]....
The blogpost i am testing got 3 tags attached to it. The table structure is:
(table)BlogPost -> (table)BlogPostTags <- (table)Tags
So the BlogPostTags table only contains 2 fields, BlogPostID and TagID.
When i run the query above i get 3 results back. Same blogpost 3 times but with 1 tag in each. It should return 1 post with 3 tags. The problem lies in the Tags query above.
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Aug 1, 2010
What is the best way to create a custom results page using Linq to Entities?
Do I pass the values to the result page, and do the query on the result page?
or
Do I pass the query results to the custom results page?
What is the best way to pass this?
Is there an example of this on the internet?
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Dec 1, 2010
The SQL is below - each result is coming up 3 times rather than just once.
SELECT Consignments.LegacyID, TripDate, CollectionName, DeliveryName, Pallets, Weight, BaseRate, Consignments.FuelSurcharge, AdditionalCharges, BaseRate * Quantity AS 'InvoiceValue', Consignments.Customer, InvoiceNumber,
CASE
WHEN child.LegacyID = Consignments.Customer THEN child.LegacyID
WHEN parent.LegacyID = Consignments.Customer THEN parent.LegacyID
ELSE this.LegacyID
END AS 'InvoiceAcc'
FROM SageAccount this
LEFT JOIN SageAccount parent on parent.LegacyID = this.InvoiceAccount
LEFT JOIN SageAccount child on this.LegacyID = child.InvoiceAccount
JOIN Consignments on (Consignments.Customer = this.LegacyID AND this.Customer = 'True')
OR (Consignments.Customer = parent.LegacyID AND parent.Customer = 'True')
OR (Consignments.Customer = child.LegacyID AND child.Customer = 'True')
WHERE (this.LegacyID = @Customer) AND (TripDate BETWEEN @fromdate AND @todate) AND (InvoiceNumber IS NOT NULL)
The SQL was given to me for another similar query, but this time I have modified it to try to use it for the query I'm doing now, so I'm assuming that I'm doing something stupid.
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Oct 2, 2010
I've managed to use my MS Access database with repeaters and gridviews in my website. Basically, printing the result of a query directly to the website seems easy enough using something like this :
[Code]....
After quite a bit of googling this seems to be a common way to do this. My question then seems kinda silly.
I want to use some of the data from the query in for example a variable without sending the data to a repeater or gridview and so on. Say I just want the username and a password from a database and want to store the username in one variable and the password in another for further use in the code. What do I do?
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Mar 11, 2011
i query a database for retreiving all the columns. I will probably have many rows. Im trying to output the query results into an html table. This is what i have so far:
[code]....
How could i store the many rows and output them using html as soon as i open a page?
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Aug 2, 2010
I have an asp.net intranet site hosted on IIS on my computer.
On one page you can enter two user id's and get a side by side comparison of their roles in our (custom app) system.
I often use it to add roles when I'm setting up new users. After running the query, if i change a role and run the query again it will not show updated results. It's being cached somehow. I have to go to another page and come back and them run the query to get updated results.
How can avoid having to navigate away to get the updated query results displayed.n
[Code].....
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Jan 16, 2011
I have a Query which I run as an SQL. This is my SQL:
"SELECT COUNT(*) As NoDup FROM [XXX Dir] WHERE (FileName Like 'XXX_YYY_20100916.txt')"
The "XXX Dir" is a table and "FileName" is a text field within that table.
When I execute the SQL in the Query development windows, it returns a single value like 2.
I would like to assign that value to a variable so I can use it in my VB code.
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Dec 29, 2010
I've got the following LINQ query to my IQueryable service
Dim eventcount = EventService.QueryEvents().Count
Dim eventlist = EventService.QueryEvents().Skip((page - 1) * 5).Take(5).ToList
But I'm wondering if there's a way to do this without making two calls to the database?
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Nov 22, 2010
I have LINQ result, and I have List.I want to do Where() on the LINQ and to REMOVE all the matching strings from the List.I get errors of:Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operato
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Jan 20, 2010
im new to linq and im having lots of trouble creating complex queries.. My problem mainly is that i am using Linq as a BLL.
i created a dbml (with namespace called DAL) file with 2 tables with a one to many relation. Pop and City. There is a forgien key in pop that points to a city. I also created a class called Pop that inhertis DAL.Pop. Now in my ASPX page, i want to call a function in the Pop class that would retrieve some Pop according to its ID, but i need the city name as well.. Ive been going around this in circles for days. I dont know how to write the Linq syntax and i dont understandd how my function's signature should be like.. I want to recieve a table that i can bind to a Gridview and preferable, specify which coloumns to bind.
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Aug 8, 2010
I have the following statement:
List<string> tracks = new List<string> { "ABC", "DEF" };
var items = (from i in Agenda.AgendaSessions
select i).Where(p => p.Tracks.Any(s => tracks.Contains(s.Code)));
this returns all sessions which track contains either ABC or DEF, now when I rewrite the statement like the following, it returns All sessions regardless, as if the clause always yeilds into true,
var items = from i in Agenda.AgendaSessions
where i.Tracks.Any(s=> tracks.Contains(s.Code))
select i;
Update
if there are other clauses within the where, does that affect the results?
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Mar 14, 2011
I have a simple If..Then like so:
If rhcexists.First.SignatureDate > Date.Today.AddMonths(-6) Then
End If
rhcexists is a simple query to the Entity Model:
Dim rhcexists = From p In dbContracts.Signatures _
Where p.StudentID = CStr(Session("people_code_id")) _
And p.ContractType = "rhc" _
Order By p.ID Descending _
Select p
Problem is that this comparison results in an error:
LINQ to Entities does not recognize the method 'System.Object get_Item(System.String)' method, and this method cannot be translated into a store expression.
This is occurring on the If clause. Any ideas why this occurring and how I can fix it?
I am using ASP.NET 4, EF 4, and VS 2010 SP1.
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Jan 26, 2010
I want to display sql query results in my web application (asp.net webpage) dynamically at the run time. But I don't know how to do that. Is there any control to do that? Or is there any code? Could you give some examples?
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