How to pass var type data which comes as list with index 0,1,2,3 etc

Question

I have var type data coming from db i want to pass it as model can someone share the controller and view example to iterate and show on view asp.net core mvc

Abhishek Yadav · Answer

Certainly! If you have a var type data coming from the database and you want to pass it to a view in ASP.NET Core MVC, you'll need to first cast or convert it to a model or a view model. Here’s an example of how you can do this: Example Scenario Let’s assume you have a database result returned as var that contains a list of Product objects, and you want to display this list in a view. 1. Define Your Model First, define a model that matches the data structure you want to display. For example: public class Product { public int Id { get; set; } public string Name { get; set; } public decimal Price { get; set; } } 2. Create a Controller In your controller, you’ll fetch the data from the database, convert it into a list of Product , and pass it to the view. using Microsoft.AspNetCore.Mvc; using System.Collections.Generic; using System.Linq; public class ProductsController : Controller { // Assume this is your data access service private readonly IDataService _dataService; public ProductsController(IDataService dataService) { _dataService = dataService; } public IActionResult Index() { // Fetch data from the database as `var` var dataFromDb = _dataService.GetProducts(); // This returns `var` type data // Convert `var` type data to List var products = dataFromDb.Cast ().ToList(); // Assuming `dataFromDb` can be cast to IEnumerable // Pass the list to the view return View(products); } } 3. Create a View Create a view named Index.cshtml under Views/Products/ to display the list of products. @model IEnumerable Products Products List ID Name Price @foreach (var product in Model) { @product.Id @product.Name @product.Price.ToString("C") } Notes Casting var Data : In this example, _dataService.GetProducts() returns a var , which is cast to IEnumerable . Ensure the casting is correct based on the actual data type returned from your database. If you’re dealing with DataTable or dynamic , you might need additional steps to map it to your model. Data Service : Replace IDataService and its method GetProducts with your actual data access logic. Error Handling : Consider adding error handling and validation in your real application to manage potential issues with data retrieval and casting. This approach should help you display data from a database in an ASP.NET Core MVC view. Let me know if you have any specific details or additional requirements!

Sam Hobbs · Answer

A `var` type is not actually a type, there is always a real type for the object. Your situation is an example of why I avoid using var. If it were me I would determine what the type actually is and then I probably do not need to cast it to something else.