C# - Pass hidden value from .NET Core View to Controller-CodePudding

I am trying to pass a hidden value from View to Controller in ASP.NET Core.

@using (Html.BeginForm("PostTest", "Test", FormMethod.Post)
{
    @Html.HiddenFor(model => model.id, new { @Value = "123456789" })
}

In my controller, I am receiving it as a model

public ActionResult TestId(ObjTest objTest)
{
     string result = objTest.id;
     Console.WriteLine(result) 
}

This is my model:

    public class ObjTest
    {
        public string id { get; set; }
    }

However, I am unable to retrieve the value "123456789".

CodePudding user response：

Can you modify the code like this?

<form method="post">
    <input type="hidden" asp-for="Id" value="123456789">
    <input type="submit" value="Submit" />
</form>

Use the asp-for attribute instead of @Html.HiddenFor

CodePudding user response：

You can use @Html.Hidden

@using (Html.BeginForm())
{
    @Html.Hidden("id", "123456789" )
  
    <input type="submit" value="Submit" />
}

result:

If you want to use @Html.HiddenFor, you need to set the value in the get method, like below:

public ActionResult TestId()
        {
            var model = new ObjTest();
            model.id = "123456789";
            return View(model);
        }
        [HttpPost]
        public ActionResult TestId(ObjTest objTest)
        {
            string result = objTest.id;
            Console.WriteLine(result);
            return View();
        }

Then

@Html.HiddenFor(model => model.id)