linq

Forcing Entity Framework to not generate NCLOB's when building Linq-to-Sql Code (Model First)

由 不羁的心 提交于 2021-02-19 00:36:01
问题 I have a class with a nullable int property that that for filtering reasons, I need to convert to a string to do some comparisons. I have EF 6.1.2 installed, so using a .ToString() will work for that. queryableData = queryableData.Where(a => a.PropName.HasValue && a.PropName.Value.ToString().Contains("8675309")); When examining the actual SQL being executed, the number is being CAST into an NCLOB type, which is resulting in the following error: ORA-00932: inconsistent datatypes: expected

Forcing Entity Framework to not generate NCLOB's when building Linq-to-Sql Code (Model First)

由 南楼画角 提交于 2021-02-19 00:34:36
问题 I have a class with a nullable int property that that for filtering reasons, I need to convert to a string to do some comparisons. I have EF 6.1.2 installed, so using a .ToString() will work for that. queryableData = queryableData.Where(a => a.PropName.HasValue && a.PropName.Value.ToString().Contains("8675309")); When examining the actual SQL being executed, the number is being CAST into an NCLOB type, which is resulting in the following error: ORA-00932: inconsistent datatypes: expected

Forcing Entity Framework to not generate NCLOB's when building Linq-to-Sql Code (Model First)

由 ￣綄美尐妖づ 提交于 2021-02-19 00:34:11
问题 I have a class with a nullable int property that that for filtering reasons, I need to convert to a string to do some comparisons. I have EF 6.1.2 installed, so using a .ToString() will work for that. queryableData = queryableData.Where(a => a.PropName.HasValue && a.PropName.Value.ToString().Contains("8675309")); When examining the actual SQL being executed, the number is being CAST into an NCLOB type, which is resulting in the following error: ORA-00932: inconsistent datatypes: expected

Should Count() of an IEnumerable be avoided?

由 ╄→гoц情女王★ 提交于 2021-02-18 20:29:32
问题 In general, I am using a List and then returning them as IEnumerable when I no longer need to update them. However, I ran into an issue where I actually need to enumerate through them but first need to know the count. Will IEnumerable enumerate every item and find the count (O(N)), or will it rely on List 's Count property (O(1))? Also, what if the IEnumerable is the result of a LINQ query? 回答1: Will IEnumerable enumerate every item and find the count (O(N)), or will it rely on List's Count

LINQ nested (inner) JOIN does not join children

由 对着背影说爱祢 提交于 2021-02-18 19:42:30
问题 Being rather new to LINQ, I am probably not looking for the correct search terms, that's why I am asking here. I have a data transfer object (DTO) for the current timestep and a DTO for the previous timestep. I am intending to JOIN this information into a single (nested) list and display procentual changes (for all entries of the list). The nested contains nodes of type myObject . In other words, the list consists of a couple of parent entries and (different levels of) child elements of the

How to call multiple actions in View in ASP.NET MVC?

由 最后都变了- 提交于 2021-02-18 19:10:46
问题 Problem is: I am using a textbox to get a string q and want to pass it to 3 different actions in search controller. i.e. action1(string q), action2(string q) and so on Now syntax of my action: public ActionResult action1(string q) { var mydata = from p in fab //LINQ logic select new action1class { data1=p //assignment }; return View("_partialAction1", mydata); } Similarly there are two other actions. I am using 3 different actions because my LINQ logic gets data from 3 different sources so

How to call multiple actions in View in ASP.NET MVC?

由 时光毁灭记忆、已成空白 提交于 2021-02-18 19:10:04
问题 Problem is: I am using a textbox to get a string q and want to pass it to 3 different actions in search controller. i.e. action1(string q), action2(string q) and so on Now syntax of my action: public ActionResult action1(string q) { var mydata = from p in fab //LINQ logic select new action1class { data1=p //assignment }; return View("_partialAction1", mydata); } Similarly there are two other actions. I am using 3 different actions because my LINQ logic gets data from 3 different sources so

Noah Mt4跟单系统制作第十篇 锁篇

由 試著忘記壹切 提交于 2021-02-18 16:43:53
using System; using System.Collections.Concurrent; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; namespace Copier.Core { public sealed class KeyLocker<T> : IDisposable { private static readonly object _lockerDictionary = new object(); private static readonly Dictionary<T, LockerObject> _lockerObjects = new Dictionary<T, LockerObject>(); private T _key; public KeyLocker(T key) { _key = key; LockerObject lockerObject; lock (_lockerDictionary) { if (!_lockerObjects.TryGetValue(_key, out lockerObject)) { lockerObject =

How to Select All with a One to Many Relationship Using Linq

由 情到浓时终转凉″ 提交于 2021-02-18 12:57:32
问题 I have two tables: CREATE TABLE Thing ( Id int, Name nvarchar(max) ); CREATE TABLE SubThing ( Id int, Name nvarchar(max), ThingId int (foreign key) ); I want to select all Things with a listing of SubThings and set them to a ThingViewModel. The Thing ViewModel is simple: public class ThingViewModel { public int Id { get; set; } public string Name { get; set; } public List<SubThingViewModel> SubThings { get; set; } } The SubThingViewModel is: public class SubThingViewModel { public int Id {

Null coalesce not working in LINQ query

由 99封情书 提交于 2021-02-18 12:45:31
问题 Take this: int? item1 = null; int? item2 = null; someObjectList.Where(x => x.SomeItem1 == (item1 ?? x.SomeItem1) && x.SomeItem2 == (item2 ?? x.SomeItem2) ); Where someObjectList is not empty and SomeItem1 and SomeItem2 is null in all the objects in the list. Why is it returning nothing? EDIT: My Code: public void GetPlacementsByMaterial(long clientMaterialID) { ClientMaterial clientMaterial = ((ApplicationEntityModel)NavigationItem.ObjectContext).ClientMaterial.FirstOrDefault(x => x
订阅 linq