Model binding is not working, when I enter the values in text box view , it is not assigned to action method parameter in controller.

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Index.cshtml page has text box and search button , when we click search button the value of the text box needs to be assigned to action method parameter , The action method searchById is in Home controller,

I am getting below error ,

The parameters dictionary contains a null entry for parameter 'Id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult SearchById(Int32)' in 'ModelBinding.Controllers.HomeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters

What I have tried:

Index.cshtml page

@model IEnumerable< ModelBinding.Models.Employee>
           

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    @using (Html.BeginForm("SearchById","Home"))
    {
        <p>
            <label>Enter ID:<input type="number" id="Id" /></label>
        </p>
        <button>Search</button>
    }

Home controller SearchbyId method with integer parameter:

public ActionResult SearchById(int Id)
       {
           return View("Index", empList.Where(x => x.Id == Id));
       }

Posted 17-Dec-17 18:22pm

Meiyarasan K

Updated 18-Dec-17 8:27am

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2 solutions

Solution 2

Hello Meiyarasan,

Do changes on your view:

replace
@model IEnumerable< ModelBinding.Models.Employee>
to
@model ModelBinding.Models.Employee

and

to
@html.textboxfor(m=>m.Id,new(ID="ID"))

Posted 17-Dec-17 18:45pm

Rahul Newara

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Richard Deeming · Accepted Answer · 2017-12-18T08:22:00

Solution 3

HTML form controls only send their value to the server if they have a name attribute. Your <input> only has an id attribute, so the value won't be submitted.

HTML

<label>Enter ID: <input type="number" id="Id" name="Id" /></label>

HTML input tag[^]

Posted 18-Dec-17 8:22am

Richard Deeming