使用 Html.RadioButtonFor 通过检查 html 属性

Question

I want to use @Html.RadioButtonFor(expression, value, htmlAttributes) in ASP.NET MVC with one of the radio buttons checked by default, but it is not working. I've read a lot of posts about this in StackOverflow, but none of them has able to solve the issue. Any help on how to get this working is appreciated. Below is how my MVC looks like:

View

<h4>Search Book by:</h4>
<span>Title: </span> @Html.RadioButtonFor(expression: m => m.Input.SearchBy,value: "Title", htmlAttributes: new{@checked = true})
<span> | Isbn: </span> @Html.RadioButtonFor(m => m.Input.SearchBy,"Isbn")
<span> | Author: </span> @Html.RadioButtonFor(m => m.Input.SearchBy,"Author")
<span> | Publisher: </span> @Html.RadioButtonFor(m => m.Input.SearchBy,"Publisher")

<button id="FindSubmit" type="submit" class="w-100 btn btn-lg btn-primary">Find</button>

Model

public class GetBooksByConditionsParameters : AdminBookParametersBase
    {
        public InputModel Input { get; set; }
        public GetBooksByConditionsParameters() => OrderBy = "title";
        public uint MinPrice { get; set; }
        public uint MaxPrice { get; set; } = 10000;

        public bool ValidPriceRange => MinPrice < MaxPrice;      

        public class InputModel
        {
            public string? SearchTerm { get; set; }
            public string SearchBy = "Title";           
        }            
    }

Controller

[HttpGet]
public IActionResult Find()
{
    return View();           
}

Answer 1

You can try to use @Html.RadioButton to replace @Html.RadioButtonFor :

<span>Title: </span> @Html.RadioButton("Input.SearchBy", "Title", new { @checked = "checked" })
<span> | Isbn: </span> @Html.RadioButton("Input.SearchBy", "Isbn")
<span> | Author: </span> @Html.RadioButton("Input.SearchBy", "Author")
<span> | Publisher: </span> @Html.RadioButton("Input.SearchBy", "Publisher")

result: