为什么 JQuery Validate 在 ASP.NET Core MVC 中标记为默认必需的输入字段-解网

问：

我有一个简单的视图，它绑定到一个模型，其中两个属性都不是必需的（并且都是字符串）。默认情况下，生成的标记将该字段标记为必填字段，即使我没有指出此字段在任何地方都是必填字段。[nullable]Question

它为什么要这样做？我需要做些什么来指示此字段不是必需的？

视图：

@model EightBallModel
@{
    Layout = null;
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Magic 8-Ball Game</title>

    <!-- CSS Includes -->
    <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">

    <style type="text/css">

        .field-validation-error {
            color: #ff0000;
        }

    </style>
</head>

<body>
    <div class="container">
        <div class="col-md-6 col-md-offset-3">
            <h1>Ask the Magic 8-Ball Anything</h1>
    
            <form method="post" asp-action="GetAnswer" asp-controller="Home">
                @Html.AntiForgeryToken()
                <div class="form-group">
                    @Html.LabelFor(m => m.Question)
                    @Html.TextBoxFor(model => model.Question, new {@class="form-control"})
                    @Html.ValidationMessageFor(model => model.Question)
                </div>
                <button type="submit" class="btn btn-success submit">Ask</button>
                <br/><br/>
                @Html.ValueFor(x => x.Answer)
            </form>

        </div>
    </div>

    <!-- JS includes -->
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
    <script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>

    <script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
    <script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>

</body>
</html>

模型类：

using System.ComponentModel.DataAnnotations;

namespace MagicEightBall.Models
{
    public class EightBallModel
    {
        public string Answer { get; set; } = string.Empty;
        public string Question { get; set; } = string.Empty;
    }
}

控制器动作方法：

public IActionResult Index()
{
    return View(new EightBallModel());
}

结果：

生成的标记：

asp.net-core-mvc net-6.0 不显眼验证

为什么 JQuery Validate 在 ASP.NET Core MVC 中标记为默认必需的输入字段

Why is JQuery Validate marking an input field required by default in ASP.NET Core MVC

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