linq Questions
3
Solved
I have a Collection, I'm trying to use the Distinct method to remove duplicates.
public static Collection<MediaInfo> imagePlaylist
imagePlaylist = imagePlaylist.Distinct(new API.MediaInfoCo...
Gwen asked 30/12, 2011 at 5:15
4
I have a data call in a Linq to Entities powered data access layer that is designed to make paged calls.
In doing so, I need to select a subset of the data, say 50 rows, but also get the count of ...
Mosenthal asked 23/3, 2015 at 18:54
7
Solved
I'd like to order my list by a string converted into an int:
var orderedListOfRfidTags = uow.RfidTags.OrderBy(t => Convert.ToInt32(t.Number)).ToList();
but get: The method 'ToInt32' is not su...
Marianomaribel asked 12/5, 2011 at 21:52
4
Solved
I have a list of checkbox elements in a html page, all selectable and with distinct IDs, and its IDs are send by HTTP POST to my API. For security, I need to check if any of the sent IDs is invalid...
Unborn asked 7/5, 2018 at 22:6
6
Solved
I have a medication table that I'm looking for certain drug names, but I need to search for multiple names. Here is where I currently am with it.
string[] names = new string[2];
names[0] = "apixab...
3
Solved
I want to populate a drop down with the public properties of a particular object, which I have done fine. But now when the user selects the value from the dropdown, I want it to group the DB table ...
Aquileia asked 23/10, 2013 at 11:41
7
Solved
I've got a User table with a bitmask that contains the user's roles. The linq query below returns all the users whose roles include 1, 4 or 16.
var users = from u in dc.Users
where ((u.UserRoles...
6
Solved
I want to search my db with different keys. According to the input, there may be 1 key to 10 keys. Is there a way to add OR/AND clauses to my Linq query dynamically?
keys[k] // I have my keys in ...
Hyperextension asked 14/1, 2013 at 14:10
12
Solved
I simplified the code a little while trying to debug:
[HttpPost]
public ActionResult Register(User model)
{
DateTime bla = new DateTime(2012, 12, 12);
try
{
User user = new User
{
gid = 1,...
Fran asked 30/5, 2012 at 14:49
4
Solved
I would like to know to to write most efficient LINQ (EDIT: to Entities) query with a list as a condition. Here is the thing.
Lets say we have the following data structure:
public class Recipe
...
4
Solved
I have a LINQ expression that is working fine on the production database but throws an error on the SQLite in-memory database of the test context:
The LINQ expression (EntityShaperExpression:
Enti...
Inland asked 3/3, 2020 at 9:1
5
this is my first question and sorry about my weak language.
I've got a table like this model;
public class Menu
{
[Key]
public int ID {get;set;}
public int ParentID {get;set;}
public string...
Sit asked 27/1, 2017 at 13:10
2
Solved
When creating new objects in a LINQ statement, for example:
var list = new List<string>() { "a", "b", "c" };
var created = from i in list select new A();
With class A looking like this:
c...
Lussier asked 20/9, 2013 at 12:45
1
In an answer to my another question I was told to use QueryExtensions to achieve async computations with F# and Entity Framework, and I'm using that advice successfully.
For example, I have the fo...
Rame asked 4/10, 2015 at 10:56
6
Solved
I'm trying to get data from a LocalDb into my MVC Controller. I tried this:
UsersContext db = new UsersContext();
var users = db.UserProfiles.Where(u => u.UserId == WebSecurity.CurrentUserId)
...
Shadowgraph asked 17/12, 2013 at 15:14
12
I know a typical way is like this:
IQueryable query = from staff in dataContext.Staffs;
if(name1 != null)
{
query = from staff in query where (staff.name == name1);
}
However, from a program we...
Underage asked 26/4, 2011 at 8:30
3
Solved
I have this xml
<config>
<audio first="true" second="false" third="true" />
</config>
I want my code to able to do something like this
if (xdoc.getAttr("first")=="true")
Con...
Thorrlow asked 13/12, 2010 at 14:39
2
Solved
It's common in C# to modify objects in private methods as they are commonly reference-types instead of value types, for example:
public void Main()
{
var person = new Person();
SetPersonsName(p...
Looseleaf asked 20/10, 2014 at 10:14
4
Solved
i have to find out whether or not two collections have any intersection, the way that i did that is using LINQ's "Join" to get the Intersection of the two collections and then i use "Any". But i wo...
Bougainville asked 16/5, 2012 at 22:5
5
Solved
I am getting the following exception:
The nested query is not supported. Operation1='Case' Operation2='Collect'
with this query
var Games = context.Games.Select(a => new GameModel
{
Membe...
Laevorotatory asked 1/3, 2013 at 22:34
4
Solved
Linq newbie here, struggling with my first GroupBy query.
I have a list of objects of type KeywordInstance which represents a keyword, and the ID of the database record to which the keyword was app...
8
Solved
I have this sql statement
SELECT userID from users WHERE
(name='name1' AND username='username1') OR
(name='name2' AND username='username2') OR
(name='name3' AND username='username3') OR
.............
Amalberga asked 8/4, 2011 at 12:55
7
Solved
I am looking to perform a query on an example list of objects
Date Username
01/01/2011 james
01/01/2011 jamie
01/01/2011 alex
01/01/2011 james
02/01/2011 matt
02/01/2011 jamie
02/01/2011 alex
02/...
8
Solved
6
Solved
I instantiated a context and want to write a simple query:
var result = db.Set.Where(x => x.Id == num).Select(whatever);
and I can't get rid of the red squiggly under Where complaining about ...
Skiascope asked 8/11, 2013 at 21:59
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