Entity Framework Core - Knowledge Base (KB)
17 results for: in tag: razor-pages
Adding a property to a Model in the ViewModel
With the Model...public class Person { public string Forename { get; set; } public string Surname { get; set; } public string DOB { get; set; } } ...I have a ViewModel which I'll be passing through to the View...public class PersonViewMo...
asked by Dave
ef core one to many relationship throw exception Cannot add or update a child row
My Shop and Product entities have a one to many relationship, please see my models...public class Product { public int ID { get; set; } public string Name { get; set; } public string Tag { get; set; } public string Brand { get; set; } publi...
asked by Allen4Tech
Getting System.ObjectDisposedException when redirecting pages
Update: The problem was that the OnGet methods was async. Thank you everyone for the help and input!...In my first page (Home) i'm getting a list of Users: ...HomePageModel:...public async void OnGetAsync() { var everything = await _contex...
asked by aneko5
How Do I make a Razor Form for a complex EF Model
I am beginning to wonder if what I am about to ask is even possible.. But it SHOULD be. ...The MS examples are woefully short of what I am after so maybe EF isn't designed the way I thought. (BTW Scaffold for CRUD for each individual table works great. Bu...
asked by CBERBER
How do I model a 3-table database in a ASP.NET web app using Razor Pages?
Creating my first web app. Using ...ASP.NET... and ...Razor Pages...+.... Developing it in VS 2017....(Note: Similar to unanswered S.O. question ...ASP.NET Core : Generate Razor Pages for all models...)...+In ASP.NET Core tutorials [...https://docs.micros...
asked by William Charlton
IFormFile 'System.InvalidOperationException'
The non-public.member _baseStream attribute in IFormFile in my ASP.NET Core application throws the following exception after uploading a file:...ReadTimeout = ((Microsoft.AspNetCore.Http.Internal.FormFile)BildUpload)._baseStream.ReadTimeout' threw an ex...
asked by pschlz
Select tag helper selected value not rendered in view
I need some help with my select tag helper. ...I have an asp.net MVC View with a select 2 control as follows:...<div class="col-md-3"> <div class="form-group"> <label asp-for="NumberingType.Type" class="control-label" data-toggle="popover" d...
asked by Ferdi
How do I access 2 DBContext in one Razor page
In my Razor page I would like to use a second DBContext that is connected to a different database....I have two DBContext that are connecting to two different database that work fine independently in the same app. DB1 is connected to MS Sql Server running...
asked by Thomas
Issues with binding multiple objects on a razor page
I am trying to build a razor page that allows the user to edit a number of different objects on a single page - specific tests to be run in a lab under a single test run. I have been running around in circles, and have now got to a point where: 1. Posting...
asked by L Robbins
Problem running project after Identity scaffolding in ASP.NET Core MVC project on Linux
I've tried adding ...<PackageReference Include="Microsoft.AspNetCore.Razor.Runtime" Version="2.2.0" /> ...However 2.2.0 is the latest version available at this time, which doesn't match the error. The error is still the same after rebuilding the app....pr...
asked by Juan Gallardo
Adding a new child data item with Razor Pages, AJAX and and Entity Framework Core
Coming from ASP.NET WebForms and feeling a bit overwhelmed. I have an ASP.NET Core Razor Page that loads an incident and all the comments related to that incident. I figured out how to refresh the comments with a partial Razor Page and AJAX, but also want...
asked by DakotaPaul
Entity Framework Core: Including lookup data from an SQL view to display in Razor Page
New to Entity Framework and am trying to include data from an SQL view, which is a list of site codes and names. I'm currently trying to list all the ...Incident...s but display the site name instead of the site code. I started with ...Incident.Site... be...
asked by DakotaPaul
updating data on one to many relation in EF core
I'm trying to update a table(FlightClasses) with multiple rows having relation of one to many with table(Flight) but i can't update it with the changed values Can anyone help me with that ...Model class of Flight i want to update rows on other table of f...
asked by Abdul Rahman Maqbool
Unable to identify where to enable the FirstOrDefaultAsync method for a ASP.NET Core model
I'm having difficulty identifying where in a ASP.NET Core app we specify that a model can have the FirstOrDefaultAsync method enabled. I've previously scaffolded two models to razor pages, and for those I can write async method like so:...component = awai...
asked by Roshan Manuel
How to merge two similar database tables into one SelectList
I have two database tables that each have two columns that are the exact same -- Name and Designator. I want to create a SelectList combining the two tables using Designator as the value and Name as the text. This is what I've tried, but the options come ...
asked by linus72982
Finding Max Date using Entity Framework Core - in Razor Pages
I am building a Razor Pages web application that would register a user into an exam. The ...ExamRegistration... Model has a field called ...MaxDateForExam... that can be nullable as this is a new feature added to existing database at a later time. When ...
asked by Richard Armstrong
I use Distinct in my complex lambda query but is not work
I want to search from two Table that have no any relations these are my tables... public class News { public int Id { get; set; } public string Title { get; set; } public string FullText { get; set; } } public cl...
asked by sunny
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