Save user form input to model and display in view (“Object reference not set to an instance of an object”)

Edit;

Sharing the code as it looks after some changes aswell as with the right variable names etc.

So I have an input form that looks like this:

@model InluppEtt.Models.UserInfo

@using (Html.BeginForm("Hello", "Second", FormMethod.Post))

@Html.LabelFor(m => m.Name)
@Html.TextBoxFor(m => m.Name)

@Html.LabelFor(m => m.Age)
@Html.TextBoxFor(m => m.Age)

@Html.LabelFor(m => m.Location)
@Html.TextBoxFor(m => m.Location)

<input type="submit" value="Send" />


@Html.DisplayName(Model.DisplayInfo)


It supposed to get posted to this action:

[HttpPost]
public ActionResult Hello(UserInfo userInfo)

var ui = new UserInfo()

Name = userInfo.Name,
Age = userInfo.Age,
Location = userInfo.Location
;

ViewBag.Message = "Success";
return View("Hello", ui);



Now I am trying to save the input into this model here but I am unable to make it work it seems.

public class UserInfo

public String Name get; set;
public String Age get; set;
public String Location get; set;

public String DisplayInfo

get

return "Name: " + Name + " Age: "
+ Age + " Location: " + Location;






I am trying to show the data underneath the form in the view but as I visit that page the first thing I get is an "Object reference not set to an instance of an object." error at the

@Html.DisplayName(Model.DisplayInfo)


Thanks

Html.BeginForm()

Hello

Request

@Model.DisplayText

@Html.DisplayText

2 Answers
2

Edit

view:

@model Test.Models.UserInfo
@
ViewBag.Title = "Hello";
Layout = "~/Views/Shared/_Layout.cshtml";


@using (Html.BeginForm("Hello", "Test"))

@Html.LabelFor(m => m.Name)
@Html.TextBoxFor(m => m.Name)

@Html.LabelFor(m => m.Age)
@Html.TextBoxFor(m => m.Age)

@Html.LabelFor(m => m.Location)
@Html.TextBoxFor(m => m.Location)

<input type="submit" value="Send" />


@ViewBag.Message
<br />
@Html.DisplayName(Model.DisplayInfo)


controller:

using System;
using System.Web.Mvc;
using Test.Models;

namespace Test.Controllers

public class TestController : Controller

public ActionResult Hello(UserInfo userInfo)

if (!String.IsNullOrEmpty(userInfo.Name))
ViewBag.Message = "Success";
return View(userInfo);





model:

using System;

namespace Test.Models

public class UserInfo

public String Name get; set;
public String Age get; set;
public String Location get; set;

public String DisplayInfo => "Name: " + Name + " Age: " + Age + " Location: " + Location;




return View("location_to_your_cshtml_view_file", displayInfo);

displayInfo

View(displayInfo);

Yes, because you(DefaultModelBinder) are accessing object without initializing it into your view GET Request. I hope there is no object instantiation in your [httpget] of ActionMethod. You need to instantiate first then pass to your ActionMethod get request and this will show empty string (what value types are initialized to default).

[httpget]

[HttpGet]
public ActionResult Hello(UserInfo userInfo)

var ui = new UserInfo();
return View("Hello", ui);



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