I have a datakey that I'd like to query from my GridView instead of looping through all the rows and comparing the key of each row. So I was wondering if it was possible to just do a linq query on the gridview (not datatable) and filter with the datakey.
View 4 RepliesI'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.
When I populate a gridview with a linq to sql datasource, I get the results I expect, however, when I try to use a linqToSQL query and try to databind that to the gridview, I get no records returns.
My Linq looks fine and I don't recieve any errors, so if someone could take a quick look and point out an obvious flaw.
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New to Linq and Var type have a method where linq query is executed, want to return the result and assign it to GridView. but method don't take the return type as var.
So was wondering how do i return this query result?
Should i assign this result to DataTable first and make the method return type as DataTable?
Here is the code, This is what i want to do but not sure what is the right way
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I am looking for a way to do paging with a GridView when i set the datasource at run time using a linq query. here is my code:
ETDataContext etdc = new ETDataContext();
var accts = from a in etdc.ACCOUNTs
orderby a.account_id
select new
{
Account = a.account_id,
aType = a.SERVICEs.FirstOrDefault().SERVICE_TYPE.service_type_desc,
name = a.SERVICEs.FirstOrDefault().service_name,
[Code]....
But that works well when you use a datatable but not with linq. If I add a rebind in the event, it has to requery 7000 records which can be a little slow. Does anyone know how to fix the paging when using linq like this?
how can I display a linq query in a gridview that has data from multiple tables AND allow the user to edit some of the fields or delete the data from a single table?
I'd like to do this with either a linqdatasource or a linq query. I'm aware I can set the e.Result to the query on the selecting event. I've also been able to build a custom databound control for displaying the linq relations (parent.child).
However, I'm not sure how I can make this work with delete? I'm thinking I may need to handle the delete event with custom code.
I have added a partial class to one generated by the Entity Framework. I wanted to add a calculated field that I could bind to my GridView. However, when I try to access the new property, I get an error message that this is a limitation to Entity Framework.Are there any work arounds to accomplish this?
View 1 RepliesI've got a gridview that will allow clients to edit options they've already entered on another page. The gridview has three radio buttons in it each with a value of 1,2,3. The option value in the dataset is 1,2 or 3 respectively. I would like to have the radiobutton with the corresponding value selected in the gridview so they can see what they previously chose and will then be able to edit, if they wish.
Here's my code so far:
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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.
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]...
select Groupid,GroupName,onorusername from palgroup where groupid in (select distinct Groupid
View 5 RepliesI 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?
I am writing a linq query to select a blogpost,
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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.
I have a web app for our golf club. When I compute handicap index for each golfer, I have to select the most recent scores and then a subset of those scores depending on how many rounds of golf the golfer has played. All the scores are entered into a single SQL Express table called "Rounds". Verbally, this is what I'm trying to do:
1) select the twenty most recent golf scores (sort on date descending, "take(20)") [if less than 20 records, then select all available];
2) for this set of records, select the 10 lowest scores (or smaller number if golfer has less than 20 rounds);
3) compute the average round differential for the subset of records, etc. to calculate handicap index (this step is working ok...)
My current VB code has this LINQ query (which is flawed -- it selects the lowest handicap differential scores of ALL records for the filtered user):
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How do I modify this query to accomplish items 1) & 2) above? It seems this should be simple, but my experience with queries is still limited.
I have a list which contains few email ids
List<string> EmailId= { ....}
Now I have a db table Users. I need to select all users whose email exist in the above list. In sql we could write "where emailid in ('email1', email2' ,...)"
how to do this in linq to sqlquerable<Users> existingUsers = Users.getTable().where (u=>u.emailaddress in EmailId). I want to do some thing similar
I need to figure out how to express this in linq to sql:I have one or more records that contain what is essentially a wildcard sql parameter, like '100_-___-2', which should match 100[any 1 char]-[any 1 char][any 1 char][any 1 char]-2, for example. Each login will have one or more of these 'datamasks' associated with it.I need to write a query in linq to sql that does something like:
select * from something
where fieldA = 'someValue' or fieldB = 'someValue'
so far, simple, but I also need to restrict the returned records to only those that match the user's 'datamasks'. I'm not sure exactly how to translate this to linq to sql... here is what a working query *without* the datamasks part looks like:
[Code]....
I need to tack on the datamasks part... can I do it right there in the same statement? or do I need to do a foreach loop on the datamasks records and append a new && condition for each one? hmmm... just thought of that as I was writing this.. I'll try that out. But I'm posting this anyway for more input... I guess that would look something like:
foreach (string mask in datamasks)
{
query = query.Where(item =>
System.Data.Linq.SqlClient.SqlMethods.Like(item.AccountNum, mask));
}
would that work? would each additional 'where' condition be 'appended' to the existing query definition?
Users
Roles
UserRoles
MenuItems
RoleMenuItems
A User can have multiple Roles and a MenuItem can be accessed by multiple Roles. Now I want to write a method as follows:
public IList<MenuItems> GetMenuItems(UserRoles userRoles)
{
var menus = // LINQ query to get the MenuItems by UserRoles
return menus.ToList();
I need to use Union for below Linq queries. I could use Union it if it was simple "select new whith{" but Now that I Specified Class, I encounter Error using union
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i need to use the like operator in a linq queryfor this:
timb = time.Timbratures.Include("Anagrafica_Dipendente")
.Where(p => p.Anagrafica_Dipendente.Cognome + " " + p.Anagrafica_Dipendente.Nome like "%ci%");
Table User (UserID, Username)
Table Admin (AdminID, Username)
Table PM (PMID, SenderID, Sendertype, RecipientID, RecipientType)
Get all Information from PM
if SenderType == 'A' join SenderID to Admin-Table, get Username
if SenderType == 'U' join SenderID to User-Table, get Username
if RecipientType == 'A' join RecipientID to Admin-Table, get Username
if RecipientType == 'U' join RecipientID to User-Table, Get Username
someone have an Idea how to solve in 1 query?
I need to filter LINQ query using comboboxes and textboxes. The problem is I can't manage to get the result and I always get the empty gridview (used for showing filtered data). Can anyone help me why am I getting no results at all? I've checked the debugger and the data sent to query is valid, although, I'm not sure about "string.Empty" value.
string naziv, nazivEn, adresa, tel, fax, mob, email, web, oib, tip, mjesto;
if (chkMjesto.Checked == true)
{
mjesto = cbMjesto.SelectedItem.Text;
}
[code]....
SELECT Sum(ABS([Minimum Installment])) AS SumOfMonthlyPayments FROM tblAccount
INNER JOIN tblAccountOwner ON tblAccount.[Creditor Registry ID] = tblAccountOwner.
[Creditor Registry ID] AND tblAccount.[Account No] = tblAccountOwner.[Account No]
WHERE (tblAccountOwner.[Account Owner Registry ID] = 731752693037116688)
AND (tblAccount.[Account Type] NOT IN
('CA00', 'CA01', 'CA03', 'CA04', 'CA02', 'PA00', 'PA01', 'PA02', 'PA03', 'PA04'))
AND (DATEDIFF(mm, tblAccount.[State Change Date], GETDATE()) <=
4 OR tblAccount.[State Change Date] IS NULL)
AND ((tblAccount.[Account Type] IN ('CL10','CL11','PL10','PL11')) OR
CONTAINS(tblAccount.[Account Type], 'Mortgage')) AND (tblAccount.[Account Status ID] <> 999)
[code]....
This is my code from my controller:
MGEntities db = new MGEntities();
[HttpPost]
public ActionResult Register(RegisterModel model)
{
if (ModelState.IsValid)
{
// Attempt to register the user
MembershipCreateStatus createStatus = MembershipService.CreateUser(model.UserName, model.Password, model.Email);
if (createStatus == MembershipCreateStatus.Success)
{
FormsService.SignIn(model.UserName, false /* createPersistentCookie */);
MembershipUser myObject = Membership.GetUser();
Guid UserID = (Guid)myObject.ProviderUserKey;
MyProfile profile = new MyProfile();
profile.Address = model.Address;
profile.City = model.City;
profile.Zip = model.Zip;
profile.State = model.State;
profile.UserId = UserID;
Debug.Write(profile.State);
db.aspnet_Profiles.Add(profile);
return RedirectToAction("Index", "Home");
}
else
{
ModelState.AddModelError("", AccountValidation.ErrorCodeToString(createStatus));
}
}
This is my MyProfile Class:
namespace MatchGaming.Models
{
[Bind(Exclude = "ProfileId")]
public class MyProfile
{
[Key]
[ScaffoldColumn(false)]
public int ProfileId { get; set; }
public Guid UserId { get; set; }
[DisplayName("Address")]
public string Address { get; set; }
[DisplayName("City")]
public string City { get; set; }
[DisplayName("Zip")]
public string Zip { get; set; }
[DisplayName("State")]
public string State { get; set; }
}
}
After the linq query is executed, i check my database and nothing is added. I am using POCO for my entities. Here is my class:
namespace MatchGaming.Models
{
public class MGEntities : DbContext
{
public DbSet<MyProfile> aspnet_Profiles { get; set; }
}
}
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 a simple query i.e.
var trips = from t in ctx.Trips
select t;
The problem is that I have an extra property on the Trip object that needs to be assigned, preferably without iterating through the returned IQueryable.
Does anyone know how to set the value during the query? (i.e. select t, t.property = "value")