I have a no. of records being inserted in a List<>.I have IQueryable returning more then one recordI want to check whether the records IQueryable returns are present in the list or not?
View 1 RepliesI am making a class with an optional paramiter which will be a List<> paramiter. I want to set it's default value to null so I have used List<Params> Param = null. What am not 100% sure is checking the list to see if it was set to null or not. Is using:
if (Param == null)
I have a list<string> which have a bunch of Employee Names
Second, i have a list<Employee> (employee object )
Employee.Employee Name
Employee.status ........
Now
how can i filter list<Employee> , so that i can have the list with only the names from the List<string>
I have below class and function. Could I use LINQ to select from class list?? What the syntax should be??
class ItemsPromo
{
public long itemID;
public long promotionID;[code]....
I have declared a simple class
[Code]....
And Pass some values to it :
[Code]....
Then I use Linq to select rows :
[Code]....
How I can enumerate it?! I used this, but it has error
[Code]....
[Code]....
say i have the code above which adds a single row to a list how would i add all the information in a linq query or a var to the list?
There is a session on a web form that holds the holidays of a year.I just intend to remove any repetitive days.... but couldn't get index of item in list.
Protected Sub PersianDateCalendar1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PersianDateCalendar1.ValueChanged
[Code]....
End sub
I have a class Trans with various properties, including a boolean named Deleted.I have a generic list of Trans that are loaded from the database. I want to use linq to set all the Trans in this list to Deleted. Can I use linq to do this?
[Code]....
I have list of words. I type in a word misspelled. Can I query the list using linq to get words that sounds like (soundex) the misspelled word?
View 2 RepliesI have zero experience with LINQ but had occasion to use it today. I implemented a working solution but do have a question.First, let me provide the background:I have 20 large web pages that altogether have several hundred data input controls on them. There are strong similarities between how each type of control is handled. Rather than wire up each control individually (ie. hard code it in the layout page)
foreach (View view in multiView.Controls)
foreach (Control ctrl in view.Controls)
switch (ctrl.GetType().Name)
case "DropDownList":
DropDownList ddList = (DropDownList)ctrl;
[code]...
I want to create something like this using a DataList and Flow markup:
|-----------------------|
| Title |
|-----------------------|
| [x] Title |
| [x] Title |
| ... |
-------------------------
I have a table (modeled in Linq2Sql) Foo that has these fields
int id;
int? parentId;
string title;
Foo Parent;
EntitySet<Foo> Children;
Now, when there is a null parent, it means it's a top level category, and if the parent has a value, it's part of the category list.
I have created a DataList, and used a LinqDataSource with a query that looks like this:
[Code].....
This obviously doesn't work. How can I utilize the Children collection in a repeater of a DataList item?
Is there a way to use linq to get a list of textboxes in a web page regardless of their position in the tree hierarchy or containers. So instead of looping through the ControlCollection of each container to find the textboxes, do the same thing in linq, maybe in a single linq statement?
View 2 RepliesI am using Linq To Sql to get List of objects with data from database. To bind data with a grid view i am creating a dataset explicitly and then adding List values to that explicitly created dataset.
Now my question is whether it is a good pratice to do what i am doing (in terms of resource utilization) or is there any better way to this...
I am trying to create linq from A list:
[Code]....
But I always get this error:
[Code]....
I'm using this class to do search:[URL]
I have the following one-to-many relation between two objects.
Parent
--> IList<Child>
Now, I have a List of Parent objects and I want the First Child of each parent in the list.
What is the best way to do this using Linq?
How do you create a databound checkbox list using linq-sql and asp.net mvc
View 1 Replieshow to extract DataTable or DataSet from Linq Query or List. e.g I have linq query like this
MyDBpDataContext dcSp = new MyDBpDataContext();
dcSp.myProgrammSP().ToList();
I wrote an Sp which sends a Table as result and I have code which is already using DataTable So I want to convert this result in DataTable.
I am converting my datatable to LISt using LINQ how do I handle nulls coming from database
List<Port> portDetails = new List<Port>();
DataTable dt = ds.Tables[0];
portDetails = (from q in dt.AsEnumerable()
select new Port
{
PortCode = q.Field<string>("Code"),
ExtCode = q.Field<string>("Nb"),
Name = q.Field<string>("Name"))
}).ToList();
In the above query if Code is null I do not want property portcode to be set to the value it should only set if it is not null or not blank
PortCode = q.Field<string>("Code"),
What should be syntax
I was trying somethign like this which doesnt work
Portcode = q.Field<bool>("Code") == null ? null : q.Field<bool>("Code")
I'm new on LINQ and I'm searching the best way to do this:
I have an object client that has a list of subscriptions. Subcription has a boolean attribute "Active". Now I want load only the clients with list > 0 and subscription active.
The question is: If a client has 3 subscriptions, but only 2 are active, how can I load only the latters ? I tried in this way:
[Code]....
The query selects clients that has at least one subscription active, but viewing the results, it loads also subscriptions not active of the same client.
If you still clicked this after seeing the title, you are probably like me and sometimes code just for fun. So, that's the spirit of this; all new approaches that solve this will be marked as answer.I have a template that I can't imagine ever using again, but use 5 times on a page. I wanted to DRY up my page a little:
[Code]....
While doing this, I realized that Lambdas confuse me - I had the feeling there was a much simpler way to code it.
I am wondering into the unknown field of OOA and was looking for a way to separate my business logic from my UI. A small example is as followed:
Two DropDowns where the second one is depended on the selection in the first DropDown. You have Cars, planes, etc. inm the first DropDown and Toyota, Chrysler, etc in the second (depending on the value in the first DD.I have som Lin syntax. The file is situated in the App_Code folder and NOT as code behind. [Code]....
I would like to know how i can make populate my second Dropdown list with results. At this point it's just putting in the complete ProductSubCategory.
List<ThemeObject> themeList = (from theme in database.Themes
join image in database.DBImages on theme.imageID equals image.imageID
into resultSet
from item in resultSet
select new ThemeObject { Name = theme.Name, ImageID = item.imageID}).ToList();
dgvGridView.DataSource = themeList;
dgvGridView.DataBind();
The list object populates fine. The datagrid is setup with 2 columns. A textbox column for the "Name" which is bound to "Name" An image column which is bound to the "ImageID" field. When I execute the code I receive the following error on the DataBind() Could not determine a MetaTable. A MetaTable could not be determined for the data source '' and one could not be inferred from the request URL. Make sure that the table is mapped to the dats source, or that the data source is configured with a valid context type and table name, or that the request is part of a registered DynamicDataRoute. I'm not using any dynamicdataroutes as far as I can tell. Has anyone experienced this error before?
I would like to write Set difference minus operation with Linq on list objects using Except method. [Code]....
Tha above code always returns lstrbb objects.
Say I have a table Comments with these columns: Id, Comment, Category, CreatedDate, CommenterIdI want to get the top 5 categories from the Comments table (based on the count of each category in that table). How can I do this in linq, to return either List or IQueryable?
View 2 RepliesI'm new to Linq. I have searched and searched the web for a soluion, and can't find anything. I have a Linq query and I want to insert a row ("Select User") to the top before I pass it to the drop down list. I've been trying to use the Union but to now avail (it keeps telling me that my object doesn't support the Union method). My code, prior to attempting to inser a row, is very simple.
public SelectList DropDown_Users()
{
var context = new VivarianDataContext();
var query = from t in context.AspnetUsers
select new { t.UserId, t.LastName };
list = new SelectList(query.AsEnumerable(), "UserId", "LastName");
return list;
}
Now I try to insert a row and I found this on the internet and it seems to say that his solution will work. But it is filled with syntax errors. [URL]
I tried to implement it using the following code, but it doesn't compile.
public SelectList DropDown_Users()
{
SelectList list;
//get the original data
var context = new SQL2005633131VivarianDataContext();
var query = from t in context.AspnetUsers
select new { t.UserId, t.LastName };
//create a dummy table with an empty row
var AllUsers = new List<AspnetUsers>();
var BlankUser = new AspnetUsers()
{UserId=System.Guid.Empty, LastName="Select One"};
AllUsers.Add(BlankUser);
//use Union to join the data - ERRORS HERE
var newTable = AllUsers.Union(query);
list = new SelectList(newTable.AsEnumerable(), "UserId", "LastName");
return list;
}