How can i convert following sql guery to LINQ in C# ? I dont need all columns from both tables and the result set should be IEnumerable<DataRow>
select c.level,cl.name,c.quantity
from dbo.vw_categories c
left join dbo.vw_categoriesLocalization cl on c.level = cl.level and cl.language = 'en'
where c.level like '000%' and c.level <> '000';
I want to delete the rows present in the DataTable by using LINQ (with out looping)
The deleted rows will be come from a LINQ as below
IEnumerable<DataRow> MobileQuery = (from d in dtBillDetail.AsEnumerable()
where (String.Compare(d.Field<string>("Destination"), "MOBILE", StringComparison.InvariantCultureIgnoreCase) == 0) select d );
The DataRows present in the "MobileQuery" should be deleted in the DataTable "dtBillDetail"
I have this ListView that has a Drop Down List.Everything works fine (I think/hope) except that the drop down list are not showing its result correctly.This is the code.
Front-End
[Code]....
The code behind consist of the page_load and the ItemDataBound
[Code]....
I'm having a problem with my Linq to XML query. I'm getting the result data I want, but it's nested so deep that there must be a better way.Here is my XML:
[Code]....
I'm trying to get a list (simple string[]) of all Item IDs where Category Names contains "Other".Here is my Linq:
[Code]....
[Code]....
Here is a snapshot of my result from Visual Studio:The results I want are there ("item100", "item400", "item500"), but buried so deeply in the results var.
How can I get the query to return a simple
string[] = { "item100", "item400", "item500" }
table1 row = _db.table1.FirstOrDefault(r => r.ReferenceID == refNumber);
Is there anyway to cast row to IEnumerable?
((IEnumerable<table1>)row) - does not work
SOLVED. Code has been edited to reflect solution. Given the following GridView:
<asp:GridView runat="server" ID="GridView1" AutoGenerateColumns="false" DataKeyNames="UniqueID"
OnSelectedIndexChanging="GridView1_SelectedIndexChanging" >
<Columns>
<asp:BoundField HeaderText="Remarks" DataField="Remarks" />
<asp:TemplateField HeaderText="Listing">
<ItemTemplate>
<%# ShowListingTitle( Container.DataItem ) %>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Amount" DataField="Amount" DataFormatString="{0:C}" />
</Columns>
</asp:GridView>
which refers to the following code-behind method:
protected String ShowListingTitle( object /* was DataRow */ row )
{
Listing listing = ( Listing ) row;
return NicelyFormattedString( listing.field1, listing.field2, ... );
}
The cast from DataRow to Listing was failing (cannot convert from DataRow to Listing) I'm certain the problem lies in what I'm passing from within the ItemTemplate, which is simply not the right reference to the current record from the LINQ to SQL data set that I've created, which looks like this:
private void PopulateGrid()
{
using ( MyDataContext context = new MyDataContext() )
{
IQueryable < Listing > listings = from l in context.Listings where l.AccountID == myAccountID select l;
GridView1.DataSource = listings;
GridView1.DataBind();
}
}
I am having a lot of the same issue as this poster did with errors on initializing type.
I am trying to learn linq and am about ready to give up - don't get how this is easier...
I'm trying to do a simple update to product names in the product table based on the manufacturer ID
In order to do this I am looping through each record. I was initally successful with changing all names in the column but when I try to query the data, I continually run into multiple problems.
The following poster has had the same issue I have but his solution isn't working for me.
[URL]
I keep getting the same error on the opening bracket on the select statement in the SelectByManufacturerID function...
Error 1 Cannot initialize type 'DataBaseDataManagement.ProductName' with a collection initializer because it does not implement 'System.Collections.IEnumerable'
Button that does the actual updating...
[Code]....
The function that the button calls to get the query... ERROR
[Code]....
The class located in Query.cs...
[Code]....
IEnumerable<DataRow> query = (from obj1 in objeDC.tmpPolicyRenewals.AsEnumerable()
where obj1.AgentCode == "Admin"
select new
{
obj1.Product,
obj1.PolicyNo,
obj1.Insured,
obj1.EffDate,
obj1.ExpDate,
obj1.GrossPrem,
obj1.Status
}) as IEnumerable<DataRow>;
Getting null value. whats error ?
I have taken a DataTable control and have added colums to it. Now i want to add rows to that DataTable but when i am trying to create a DataRow of DataTable, an error is generated, showing "Value of type 'System.Data.DataRow' cannot be converted to 'dataRow'".
exact coding that i have written is as follows:
[Code]....
So, where i am getting wrong?
How can I use Order by on the result of a LinQ to SQL query ?
I have the following Situation:
Dim ret As New Object
ret = From status In tableStatus _
Select status.STATUS_ID, _
Text = Function_GetText(status.TEXT_ID)
Now I have to order this result on the field Text, has anyone an idea? (I can't use in my case Orde by Function_GetText(status.TEXT_ID))
How to randomize a LINQ query result?
Below takes 4 of the records but it won't randomize in every request. [:(]
Dim products = (From p In Northwind _
Order By Guid.NewGuid _
Select New With { _
.Name = p.Name, _
})
Return products.Take(4).ToList()
i want take a single value result from linq query
if i have :[Code]....
the variable result does not return nothing, only tostring() and similar how can i get a single result from linq query and use it in my ID variable?
How can I pass the result of the linq to a textbox?
Code:
string search = txtSearchPO.Text;
IPSBLL.TransactionInfo dbInfo = new IPSBLL.TransactionInfo();
var q = from info in dbInfo.GetTransactionInfo()
where info.PONumber == search
select info;
txtPONumber.Text = q;
I need to access the column data something like this:
Code:
DataTable.Rows[index].columnName
How can I do that in LINQ?
Here is my Controller:
public class MatchManagerController : Controller
{
//
// GET: /MatchManager/
public ActionResult Index()
{
return View();
}
public ActionResult CreateMatch()
{
return View();
}
}
Here is my View:
@model MatchGaming.Models.MatchModel
@{
ViewBag.Title = "CreateMatch";
}
CreateMatch
@using (Html.BeginForm()) {
@Html.ValidationSummary(true).....
I want my MatchTypeId to be a drop down that populates from my table MatchTypes.
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
[Code]....
I drafted 2 ASP.NET applications using LINQ. One connects to MS SQL Server, another to some proprietary memory structure. Both applications work with tables of 3 int fields, having 500 000 records (the memory structure is identical to SQL Server table). The controls used are regular: GridView and ObjectDataSource.
In the applications I calculate the average time needed for each paging click processing.
LINQ + MS SQL application demands 0.1 sec per page change.
LINQ + Memory Structure demands 0.8 sec per page change.
This Is shocking result. Why the application handling data in memory works 8 times slower than the application using hard drive? Can anybody tell me why that happens?
for example,
var result = from category in myEntities.Categories
where category.UserId == userId
orderby category.CategoryName
select category;
What is the type of "result"? I casted it to an IQueryable variable and it worked except it did not have some of the methods normally available, e.g. Count(). In my program I have to cast it to some explicit types and then use the Count() method.
I am running a LINQ query which populates a list used by a DropDownList, I need to insert an "Unassigned" value to the list. The function below queries the values correctly from the db but does not insert the "Unaasinged" value to the list.
[Code]....
I have one sproc with Dynamic Temp Table. Sproc returns dynamic temp table rows and when I drag and drop the sporc on to Linq to Sql Designer I am not getting Return Type as "(Auto-generated Type).
how can I get Return Type as Auto-generated Type.
i have a new question: i read all the tutorials that i found but i cannot understand how to pass a result of a linq to entities result to the view so that i can display the results. My query is actually in the controller function ot the view, i would now loop the results and display them in the page. How?
View 23 RepliesI have two tables: Projects and ProjectsData and I want to execute query with join and get the result in the View. In the Controller I have this code:
ViewBag.projectsData = (from pd in db.ProjectsData
join p in db.Projects on pd.ProjectId equals p.ID
where pd.UserName == this.HttpContext.User.Identity.Name
orderby p.Name, p.ProjectNo
select new { ProjectData = pd, Project = p });
What I should use in the View to extract this data. I tried that:
@foreach (var item in ViewBag.projectsData)
{
@item.pd.UserName
}
but it doesn't work.
I've been looking into how best to do this and wisdom would be appreciated. For read only purposes, I've been happily using LINQ and binding it to a grid. For editing purposes, I've used the LinqDataSource control, enabled the Edit/Delete operations in the process, and I have a nice editable grid bound to some or all of the table's fields.Now I have a situation where I want to edit a few fields in table A, but there are various values in linked table B that I want to display in that grid too (no editing of those). So my query looks like the below. The fields in tblDupes (cleared, notes) are what I want to edit, but I'd like to display those tblVoucher ones.
var theDupes = from d in db.tblDupes
where d.dupeGroup == Ref
select new
[code]...
A similar but different question LINQDataSource - Query Multiple Tables? sent me looking at scott Guthrie's blog entry http://weblogs.asp.net/scottgu/archive/2007/09/07/linq-to-sql-part-9-using-a-custom-linq-expression-with-the-lt-asp-linqdatasource-gt-control.aspx, where he handles various events to have a LinqDataSource with a custom query across tables. This still seems aimed at explicitly designed classes though, even if the class has only a subset of the fields.
So my question is: is there an easy way to allow committing of the changes made to the anonymous collection (a changes.Submit type action), or just an easy way to 'display' fields from another table while not involving them in the updating?EDIT: Thinking more, it doesn't have to be anonymous really. I'd be happy to define a class to contain the elements in that query, since it won't change often. But, those elements would be across two tables, even though only one needs updating. Not sure if that suggests entity framework would be more suitable - I get the feeling it wouldn't - I don't want the whole 'model' always grouping the fields in this way.
I am new to this, and I am trying to implement a linq query similar to db.Genres.Include("Albums") command from
mvc music store using my current DB setup. I realize that the tutorial mentions Checlking the "Include foreign key columns in the method" when creating the tables in ADO.NET, but if I am using LINQ to SQL classes, then how can I obtain the same effect. And how do I use
db.Genres.Include("Albums") to simplify my life?
I want to get data from Projects(which have CourseId) and related CourseName from Courses table.
I have written following code:
var projects = from n in db.Projects
join c in db.Courses on n.CourseId equals c.ID
orderby n.Name
select new { Project = n, Course = c };
return View(projects.ToList());
and I get error:
The model item passed into the dictionary is of type 'System.Collections.Generic.List1[<>f__AnonymousType22[ProjectManager.Models.Project,ProjectManager.Models.Course]]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[ProjectManager.Models.Project]'.
What I need to do in Controller and in View to display this data?
I'm trying to populate a treeview control using linq.
I use the following code
[Code]....
how can I declare c in fillChildren