asp.net-mvc

问题 There are several posts where people are asking how to merge generic lists. However, in my case I have two seperate linq statements where I am returning two separate database results .ToList() var appleList = (from al in db.Apples where al.Id == id select al).ToList(); var bananaList = (from bl in db.Bananas where bl.Id == id select bl).ToList(); I tried merging these list like so: appleList.Concat(bananaList); but this causes the following error: 'List' does not contain a definition for

问题 I have a model class called ClientPackage and in my controller action method i receive a FormCollection from an ajax post call that i would like to convert it to the model class ClientPackage. public class ClientPackage { public int DemandeId { get; set; } public string NumeroRequette { get; set; } public string NumeroModification { get; set; } public int CasId { get; set; } public string NumeroDossier { get; set; } public string NomPatient { get; set; } public string PrenomPatient { get; set

问题 I have a model class called ClientPackage and in my controller action method i receive a FormCollection from an ajax post call that i would like to convert it to the model class ClientPackage. public class ClientPackage { public int DemandeId { get; set; } public string NumeroRequette { get; set; } public string NumeroModification { get; set; } public int CasId { get; set; } public string NumeroDossier { get; set; } public string NomPatient { get; set; } public string PrenomPatient { get; set

问题 I'm working on a CRUD application in ASP.net C #. My problem is that when I click the Submit button and ModelState.IsValid = false, the data in the grid is lost. Does anyone know how to fix this? I have a form in html and razor, I could not leave all the work to an ajax request, so what I did was add the onsubmit event to the form with the function "sendingContacts", This function gets the grid information in a JSON string and then I assign it in a hidden field in the form, so my controller

问题 I have an ever-changing list of Industries that I'd like a user to select from when creating a new Survey. I could accomplish this with either a ViewModel or ViewBag (I think). I'm attempting to do it with ViewBag. Getting the DropDownListFor error: CS1928 HtmlHelper<Survey> does not contain a definition for DropDownListFor and the best extension method overload SelectExtensions.DropDownListFor<TModel, TProperty>(HtmlHelper<TModel>, Expression<Func<TModel, TProperty>>, IEnumerable

问题 I have a field in database stored as string and i need to convert it back to datetime and then compare if it equals to date. Below is the current implementation I have presently. var date = DateTime.UtcNow ; var zone = TimeZoneInfo.FindSystemTimeZoneById("W. Central Africa Standard Time"); DateTime currentTime = TimeZoneInfo.ConvertTimeFromUtc(date, zone); var loanDate = currentTime.Date.ToString("dd/MM/yyyy").Replace("-", "/"); if (DateTime.ParseExact(firstRepay, "dd/MM/yyyy", CultureInfo

问题 I am trying to create my first View Component in my MVC project but have come to a halt. When I try to invoke my View Component from the razor view page I get an error that states: "The name 'await' does not exist in the current context". Code I use to call the View Component: @await Component.InvokeAsync("Example") View Component class: namespace MyWebApp.ViewComponents { public class ExampleViewComponent : ViewComponent { public IViewComponentResult Invoke() { var user = Account.GetCurrent(

问题 Could anyone provide some insight or new links on using Azure B2C with MVC, .NET Core 3.1. Most examples are based on Core 2.2 https://docs.microsoft.com/en-us/samples/azure-samples/active-directory-b2c-dotnetcore-webapp/an-aspnet-core-web-app-with-azure-ad-b2c/ However, it seems more than a few things are done differently with 3.1. The error I encounter in 2.2 is: System.ArgumentNullException: Value cannot be null. (Parameter 'uriString') at System.Uri..ctor(String uriString) at Microsoft

问题 Could anyone provide some insight or new links on using Azure B2C with MVC, .NET Core 3.1. Most examples are based on Core 2.2 https://docs.microsoft.com/en-us/samples/azure-samples/active-directory-b2c-dotnetcore-webapp/an-aspnet-core-web-app-with-azure-ad-b2c/ However, it seems more than a few things are done differently with 3.1. The error I encounter in 2.2 is: System.ArgumentNullException: Value cannot be null. (Parameter 'uriString') at System.Uri..ctor(String uriString) at Microsoft

问题 Could anyone provide some insight or new links on using Azure B2C with MVC, .NET Core 3.1. Most examples are based on Core 2.2 https://docs.microsoft.com/en-us/samples/azure-samples/active-directory-b2c-dotnetcore-webapp/an-aspnet-core-web-app-with-azure-ad-b2c/ However, it seems more than a few things are done differently with 3.1. The error I encounter in 2.2 is: System.ArgumentNullException: Value cannot be null. (Parameter 'uriString') at System.Uri..ctor(String uriString) at Microsoft