Receive null value to the controller

Question

Controller 'ViewUser' getting null value from Tempdata["Identifier']. is there another way to pass the value to the controller?

 public IActionResult Details(string Id) { objInsuredList = (from obj in _db.dbLifeData where obj.Identifier.Contains(Id) select obj).ToList(); string strIdentifier = string.Empty; foreach (var item in objInsuredList) { strIdentifier = item.Identifier; } TempData ["Identifier"] = strIdentifier; } public IActionResult ViewUser(string Identifier) { objInsuredList = (from obj in _db.dbLifeData where obj.Identifier.Contains(Identifier) select obj).ToList(); return View(); }

 <div> <a class="btn btn-primary btn-lg" asp-controller="Exposure" asp-action="ViewUser" asp-route-id="@TempData["Identifier"]">Details</a> </div>

Answer 1

Controller 'ViewUser' getting null value from Tempdata["Identifier']. is there another way to pass the value to the controller?

Based on your description and comment it seems that you are trying to pass TempData ["Identifier"] = strIdentifier; value to your route value which is asp-route-id="@TempData["Identifier"]" and then you want to your pass that Identifier value to your controller ViewUser that is IActionResult ViewUser(string Identifier)

Proper Way To Pass Route Value:

<div>
    <a class="btn btn-primary btn-lg" asp-controller="Exposure" asp-action="ViewUser" asp-route-Identifier="@TempData["Identifier"]">Details</a>
</div>

Note: Replace the value with asp-route-Identifier instead of asp-route-id

Output:

Explanation:

Firstly, I am assigning the value kiron to TempData["Identifier"] = "Kiron";

then accessing the value to my view as asp-route-Identifier="@TempData["Identifier"]" and

finally, passing it to ViewUser Controller