Displaying button click results on same view using model which is based on value entered from view

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Posts: 2949

posted 4 years ago

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I create a view from which user can enter value an option from text box and based on the value of option entered by the user, data from the model will be displayed on the view. This works fine if I used 2 views. One for entering the text box option and other for displaying the results. However if I try to to this in the same view, it gives object reference not set error. This is because the model is available only when user enters the text box value and before entering the value itself it will give object reference not set. How can I achieve this using single view?

The code which works fine using 2 views:

Index.cshtml

HelloAction.cshtml

HelloController.cs

using MVCHelloWorld.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MVCHelloWorld.Controllers
{
    public class EmployeeController : Controller
    {

public ActionResult Index()
        {
            return View();
        }

[HttpPost]
        public ActionResult HelloAction(string userSelection)
        {      
            if (userSelection.Equals("option1"))
            {

List<Employee> employees = new List<Employee>()
           {
               new Employee{EmpID = "1", EmpFirstName = "Richard", EmpLastName = "Thomas"},
               new Employee{EmpID = "2", EmpFirstName = "Tom", EmpLastName = "Mathews"},
               new Employee{EmpID = "3", EmpFirstName = "Ronald", EmpLastName = "Walter"},
             
           };

return View(employees);
            }
            else
         
            {
                List<Employee> employees = new List<Employee>()
           {
               new Employee{EmpID = "4", EmpFirstName = "Steve", EmpLastName = "Jones"},
               new Employee{EmpID = "5", EmpFirstName = "Mark", EmpLastName = "Caldes"},
                new Employee{EmpID = "6", EmpFirstName = "Mathew", EmpLastName = "Smith"}
           };

return View(employees);
            }

}
        }
}

Employee.cs

This is the URL using which I run it on local:

http://localhost:57538/Employee/Index

The above code works but how to achieve the same using a single view instead of 2 views?

Thanks

Monica Shiralkar

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Posts: 2949

posted 4 years ago

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That is coming fine now after I have put a null check. Now a new issue has come that is it shows the if statement in the response itself.

This is the code that I have changed:

It shows response as this and shows even the if statement in the response:
if(model!=null) {
1 Richard Thomas
2 Tom Mathews
3 Ronald Walter
}

How can I avoid the if statement to print in the reponse?

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