ADO.NET :: Convert The Where Clause To Linq?
Oct 22, 2010how do you convert the WHERE clause of this statement to Linq ?
View 1 Replieshow do you convert the WHERE clause of this statement to Linq ?
View 1 Replieswhy use where condition before select statement in LINQ
View 2 RepliesLinq add wildcard in the where clause dynamically I have a query, i.e.
var query = from r in context.company .....
then have some business logic and based on the validation I want to add dynamically a where clause
if(a == "1")
query = query.Where(r=> r.Name = Fullname); //works!!
else if(a == "2)
query = query.Where SqlMethods.Like(r=> r.Name,"%"+Fullname+"%"); //fails to compile , the r.Name is not found..
In the code bdehind && syntax does not work, any ideas?
Entities ctx3 = new Entities();
var uniqueQuote = from quot in ctx3.Quotes.Include("aspnet_Users").Include("Enquiries")
where quot.Enquiries.EnquiryId == selectedEnquiryId && [code]...
Error 2 Delegate 'System.Func' does not take '1' arguments C:LocalGarageFinderLocalGarageFinderEnquiryDetail.aspx.cs 56 33 LocalGarageFinder
i have an problem to use of PATINDEX function in select clause with Linq.
View 1 RepliesI am using Linq to SQL. Tables have timestamp columns and I am using regular Linq methodology in ASP.NET MVC.I do use detached entities and always try to do updates without first querying the database for the original entity. To update an entity I use context.Attach(entity, true) followed by context.SubmitChanges() and all is fine. The sql statement that gets executed looks like:
[Code]...
Ive created a new LINQ To SQL class and dragged several tables across from my server, in my code I access them like this
[Code]....this is all ok, however, I have several stored procedures that I want to use as well, but when I drag the stored procedures across I get a compilatiopn error
Error 60 'DB_BL.DB_BLDataContext': type used in a using statement must be implicitly convertible to 'System.IDisposable'
how do I use stored procedures from LINQ with a using clause ?
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?
I'm having trouble writing what should be a simple sub-query using LINQ to Entities. I have two tables: Customers and Orders that have a relation on the CustID field. Not all Customers have a record in the Orders table, while some have mutiple records. In traditional SQL, you could write the query like this: SELECT * FROM Orders where CustID IN (SELECT CustID FROM Customers) I know this could be done as a JOIN in both SQL and L2E, but my actual query is more complex (about 8-9 joins), so I am hoping to find a L2E sub-query equivalent. Something like this:
[Code]....
I know LINQ to Entities does not support the " IN " clause, so I am looking for something that will work in its place.
I have the code below could to rewrite from LINq to SQL to Linq to Entity.
[code].....
I have two tables, subscriptions and topics. Each subscription is related to a specific TopicID (PK for topics table). The first query works fine and retrieves the topicID's of all videos that were uploaded today. The problem occurs when I try and then use the results of query1 as a where-in clause for query 2. I keep receiving object reference not set to instance of an object.
Query 1 IQueryable<int> topics = (from t in dataLayer.Videos
where SqlMethods.DateDiffDay(t.DateCreated, DateTime.Today) == 0
select t.TopicID).Distinct(); [code]....
I have looked at some samples around the net and they all seem to be identical to mine.
var query = from p in dc.Patients
select p.PAge;
Can i get PAge value in an any int like....
int PAge = query.Single();
I'm trying Convert.ToInt32(-----------------)
but this give me Error on run time
how convert this sql query in linq,
SELECT COUNT(AdvisorID) AS AdvisorRegisterLast2Days FROM ob_Advisor WHERE CONVERT(varchar,CreationDate,101) BETWEEN CONVERT(varchar,DATEADD(day,-4,DATEADD(day,2,GETDATE())),101) AND CONVERT(varchar,GETDATE(),101)
I have an sql statement I want to convert to LINQ (VB.Net).
View 2 RepliesIs there option to convert from Linq.IQueryable to DataTable with some sort of CopyToDataTable() function. I am trying this.
View 2 RepliesI have the following query in which I have to convert the 'bool' valu into 'string' value as "Y" or "N". I have a class defined called ChartDosCodeInfoStruct which definesQAIndicator as String. The value I am feteching from DB is a bool value. I need to take this bool value and accordingly assignQAIndicator= "Y" or "N".
UserManager userManager = (UserManager)BaseEntityManager<DataAccessLayer.User>.GetSingleInstance();
List<User> user = userManager.GetCodersForChart(_currentChart.ChartId);
UIConfigurationObject.CoderForChart.value = user.First().FullName.ToString();
[code]...
how to convert a linq query to a datatable
this is my query
[Code]....
i have this procedure:
[Code]....
the difficulties are the follows:
1)i cannot know how to execute stored procedure with LINQ
2)how can i set value to my properties after a selection?
3)how can i set optional parameters in a stored procedure by LINQ?
string pdfpath = Server.MapPath("images");
string imagepath = Server.MapPath("Images");
using (Stream inputPdfStream = new FileStream(pdfpath + "\NLI_Filled_out.pdf", FileMode.Open, FileAccess.Read, FileShare.Read))
using (Stream inputImageStream = new FileStream(imagepath + "\sign2.gif", FileMode.Open, FileAccess.Read, FileShare.Read))
using (Stream outputPdfStream = new FileStream(pdfpath + "\NLI_Filled_output.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
{
var reader = new PdfReader(inputPdfStream);
var stamper = new PdfStamper(reader, outputPdfStream);
var pdfContentByte = stamper.GetOverContent(3);
iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(inputImageStream);
image.ScalePercent(24f);
image.SetAbsolutePosition(100, 130);
pdfContentByte.AddImage(image);
stamper.Close();
}
I have the above code in 3.5 using linq..i want to convert it into dotnet 2.0..
SELECT *
FROM dc.accounts t1
INNER JOIN dc.profiles t2 ON t1.AccountID = t2.AccountID
WHERE EXISTS
(
SELECT *
FROM dc.profileblocks t3
WHERE t3.AccountID = '14' and t1.AccountID = t3.AccountID
)
How can I convert this sql query to LINQ ?
[code]...
cannot convert string to bool error in LINQthis is my code:
[Code]....
I would like to ask the programmers to help me in C# with LINQ to SQL.
I have this code conn.Open();
SqlDataReader dr = DB.ExecSpReader("select AttachmentName from AttachmentTable where TicketId=" + ticketID, param);
while (dr.Read())
{[code]....
and I need to convert it to LINQ SQL.
I like to think I know my way around eSQL, but I'm pretty ignorant when it comes to LINQ. Can anyone tell me how I would write the following ObjectQuery in LINQ?
[Code]....
There is a many-to-many association between Countries and Sponsorships (a Country may have many Sponsorships, and a Sponsorship may have many Countries). I want to find all Countries related to a specific Sponsorship based on the Sponsorship primary key.
I call a stored procedure using linq. I want to convert the ISingleResult output to datatable. what can I do?
DataClassesDataContext Dac = new DataClassesDataContext();
var ExitResult = Dac.Retrieverelations(WorkshopCode);
now I'm using below code for converting but I need a better solution.
D
dataTable dt = new DataTable();
dt.Columns.Add("Id", typeof(Int64));[code]....