I resume step by step: 1 – Create a console project. 2 – Install EF using Nuget: Install-Package EntityFramework 3 – Create SalesRepresentative: namespace EF { public partial class SalesRepresentative { public int ID { get; set; } public string Name { get; set; } public string Email { get; set; } public string CellPhone … Read more
The error message is pretty clear: The type ‘Edm.String’ of member ‘SEJ_STARDATE’ in type ‘HotelSearch.APP_SEJOUR’ is not compatible with ‘SqlServer.date Change edm.String to a recognizable datetime format (MM/DD/YYYY) by manipulating its contents or using DateTime.Parse solved “Member Mapping specified is not valid” error when saving to a database with Entity Framework
your SQL to LINQ look like this:- try this from po1 in PO join pu in POUnit on po1.POID equals pou.POID join s in Scope on pou.ScopeCodeID equals s.ScopeID join t in Timesheet on s.ScopeID equals t.ScopeID join pr in Projects on s.ProjectID equals pr.ProjectID where s.ProjectID = 1 group by s.ScopeID Select new { … Read more
Finally, I found solution to this. When I install Entity Framework, EF places some default code in application’s config file. As below: Problem Code: <defaultConnectionFactory type=”System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework”> <parameters> <parameter value=”mssqllocaldb” /> </parameters> </defaultConnectionFactory> Solution: This was root of the problem I was facing. By default it was creating a local connection string for itself. I … Read more
[HttpPost] [Route(“Paging”)] public async Task <ActionResult<IQueryable<City>>> Paging(int CurrentPage=1) { var abc= await _dropdowncontext.cities.OrderBy(x=>x.CityId).Skip((CurrentPage – 1) * 5).Take(5).ToListAsync(); if (!abc.Any()) return NotFound(); return Ok(abc); } 1 solved I am try to Pagination using Skip Take in Code Frist Approach But given Error
SaveChanges in Entity Framework causes error Validation failed for one or more entities. See ‘EntityValidationErrors’ solved SaveChanges in Entity Framework causes error Validation failed for one or more entities. See ‘EntityValidationErrors’
Try something like this: List<User> users = db.Users.Where(user => user.Roles.Any(r => r.Name == role)).ToList(); This is the case if you want to compare role names otherwise implement your Equal method 2 solved How to convert for each loop over objects list property into linq statement
DateTime picker can be implemented using jQuery’s date time picker. Or if you want an inbuilt MVC datetime picker, modify your code as : Field: [DataType(DataType.Date)] public DateTime EnrollmentDate { get; set; } and then in view <div class=”form-group”> @Html.LabelFor(model => model.EnrollmentDate , htmlAttributes: new {@class = “control-label col-md-2″ }) <div class=”col-md-10”> @Html.EditorFor(model => model.EnrollmentDate … Read more
“This issue” says that you need to add a reference to: assembly ‘EntityFramework.Core, Version=7.0.0.0 You can solve it by running the following command in the Package Manager Console: Install-Package EntityFramework.Core -Pre 2 solved References Assembly EntityFramework
I cannot answer all of your questions, but I will take a shot at a few of them (Question 1) Basically your assessment sounds right. It could also be said that EF ‘abstracts away’ the SQL that is otherwise needed to persist data to a persistent (generally a disk drive) store. (Question 7) Yes. However, … Read more
You can track the operation, the changed columns and the new values by using Change Tracking. However getting the old Value out of Change Tracking is not possible. SQL Server 2016 offers the new feature “Change data capture”, which gives you the needed Information about the old value before the update/delete happened ( see https://msdn.microsoft.com/en-us/library/bb933994.aspx … Read more
The issue is with these 2 lines: i2.Prodajalna.Add(new Prodajalna() { imeProdajalne = “Nekaj2”, naslovProdajalne = “Koper” }); i3.Prodajalna.Add(new Prodajalna() { imeProdajalne = “Nekaj2”, naslovProdajalne = “Koper” }); What you really want is to create a single Prodajalna and reuse it. The simplest way to accomplish this is to save the object first, and the re-use … Read more
Poor man’s async/await await Task.Factory.StartNew(() => PopulateList()); EDIT For those who want to see the usage of it How can i send email one after one in a row? and its follow-up question How do i make that it will send the email only once? 3 solved How to write async linq
from s in db.tblMaster let t= from u in db.tblUHTs where u.UId=’F7ECFB41-177F-4408-B856-A4F669FAA714′ select u.HTId where t.Contains(s.HTId) select new {s.HTId, s.HTN} 1 solved linq query analogous to sql Not In, In clause
Open and close as quickly as possible. Let ADO.Net connection pooling take care of minimizing overhead of actually connecting to the database over and over. As long as you use the same connection string, closing a connection does not actually close it. It just releases it back to ADO.Net connection pool. The longer you keep … Read more