Greetings sirHow can I pass the value of the CategoryId to asprouteid using the anchor Tag ltagtHomeControllerViewBagCategories dbCategoriesToListIndex ViewHtmlDropDownListFormodel gt modelCategoryId new SelectListViewBagCategories 34CategoryId34 34CategoryName34 34Select a Category34To able to use it in another viewThe User will select a particular exam from the Drop down menu which is fetched from the database like thisPublic IactionResult index

Hi DestinykidWhy are you using asprouteid You can simply use form post to pass the valueRefer below exampleDatabaseFor this example I have used of Northwind database that you can download using the link given belowDownload Northwind DatabaseModelpublic class Customer DisplayName34Id34 public string CustomerID get set DisplayName34Name34 public string ContactName get set DisplayName34City34 public string City get set DisplayName34Country34 public string Country get set Controllerpublic class HomeController Controller private DBCtx Context get public HomeControllerDBCtx context thisContext context public IActionResult Index ViewBagTest thisContextCustomersTake5Selectx gt new xCustomerID xContactName return Viewnew Customer public IActionResult Detailsstring customerID Customer custom

Pass (Send) DropDownList selected value to Controller on Anchor Link Click in ASP.Net Core MVC

Destinyk...

SOLVED CLOSED ACTIVE ANSWERED
User: Destinykid
Posted: on Feb 04, 2021 10:24 PM
Forum: ASP.Net MVC
Answer: 1
Views: 20455
Sample Code: Download

Greetings sir,

How can I pass the value of the CategoryId to asp-route-id using the anchor Tag <a>

HomeController

ViewBag.Categories = db.Categories.ToList();

Index View

@Html.DropDownListFor(model => model.CategoryId, new SelectList(ViewBag.Categories, "CategoryId", "CategoryName"), "Select a Category")

To able to use it in another view.

The User will select a particular exam from the Drop down menu which is fetched from the database like this

Public IactionResult index(){
   ViewBag.Test = Context.Test.Where(c=>c.IsActive == true).Select(x => new {x.id , x.Name}).Tolist();
   Test test = new Test()
   Return View(test);
}

This will Populate the Select Exam drop-down List in my Index with C# and Java from my database

@model Test
@Html.Label("Select Exam")
@Html.Dropdownlistfor(m=>m.TestId, new SelectList (ViewBag.Test, "Id", "Name"), "Select Exam")
<a asp-action = "ExamInstruction" asp-route-id ="@Model.Id">Next </a>

I want to use the Id of the the selected Exam to fetch the other exam details into the ExamInstruction View like Time allowed, Total Question.

This is where am struck what am trying with where statement is not working, The querystring returns 0 like this

Home/ExamInstruction/0

Public IactionResult ExamInstruction (Test test){
    var Result = Context.Test.Where(e=>e.Id == test.Id).ToList();
    ViewBag.TestName = test.Name
    ViewBag.TestDuration = test.Duration
}

At this stage, All the viewbag returns null in the ExamInstruction View

dharmend...

0 3

Reply
ANSWER
User: dharmendr
Replied: on Feb 05, 2021 01:52 AM
Modified: on Feb 06, 2021 06:31 AM
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Hi Destinykid,

Why are you using asp-route-id. You can simply use form post to pass the value.

Refer below example.

Database

For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

Model

public class Customer
{
    [DisplayName("Id")]
    public string CustomerID { get; set; }
    [DisplayName("Name")]
    public string ContactName { get; set; }
    [DisplayName("City")]
    public string City { get; set; }
    [DisplayName("Country")]
    public string Country { get; set; }
}

Controller

public class HomeController : Controller
{
    private DBCtx Context { get; }
    public HomeController(DBCtx _context)
    {
        this.Context = _context;
    }

    public IActionResult Index()
    {
        ViewBag.Test = this.Context.Customers.Take(5).Select(x => new { x.CustomerID, x.ContactName });
        return View(new Customer());
    }

    public IActionResult Details(string customerID)
    {
        Customer customer = this.Context.Customers.Where(x => x.CustomerID == customerID).FirstOrDefault();
        return View(customer);
    }
}

View

Index

@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@using ViewBag_Model_Core_MVC.Models;
@model Customer

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $('#ddlNames').on('change', function () {
                $('input[name=customerID]').val($(this).val());
            });
        });
    </script>
</head>
<body>
    @Html.DropDownListFor(m => m.CustomerID, new SelectList(ViewBag.Test, "CustomerID", "ContactName"), "Select Name", new { id = "ddlNames" })
    <form asp-controller="Home" method="post" asp-action="Details">
        <input type="hidden" name="customerID" />
        <a href="#" onclick="this.parentElement.submit();">Next</a>
    </form>
</body>
</html>

Details

@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@model ViewBag_Model_Core_MVC.Models.Customer

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Customer Details</title>
</head>
<body>
    <table>
        <tr>
            <th align="right">
                @Html.DisplayNameFor(model => model.CustomerID)
            </th>
            <td>
                : @Html.DisplayFor(model => model.CustomerID)
            </td>
        </tr>
        <tr>
            <th align="right">
                @Html.DisplayNameFor(model => model.ContactName)
            </th>
            <td>
                : @Html.DisplayFor(model => model.ContactName)
            </td>
        </tr>
        <tr>
            <th align="right">
                @Html.DisplayNameFor(model => model.City)
            </th>
            <td>
                : @Html.DisplayFor(model => model.City)
            </td>
        </tr>
        <tr>
            <th align="right">
                @Html.DisplayNameFor(model => model.Country)
            </th>
            <td>
                : @Html.DisplayFor(model => model.Country)
            </td>
        </tr>
    </table>
    <div>
        <a asp-action="Index">Back to Index</a>
    </div>
</body>
</html>

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Pass (Send) DropDownList selected value to Controller on Anchor Link Click in ASP.Net Core MVC

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