对于任何有想法的人来说，这有点奇怪……我正在特定页面上渲染一个隐藏的 bool 字段。但是，根据特定事件是否在流程之前发生，我会为同一字段获得两个略有不同的标记。正在生成的两个字段是；

<input id="HasPreviouslyIssuedCard" name="HasPreviouslyIssuedCard" type="hidden" value="false" />

<input id="HasPreviouslyIssuedCard" name="HasPreviouslyIssuedCard" type="hidden" value="False" />

@Html.Hidden("HasPreviouslyIssuedCard", Model.HasPreviouslyIssuedCard?.ToString(), new { id = nameof(Model.HasPreviouslyIssuedCard) })

@Html.HiddenFor(m => m.HasPreviouslyIssuedCard)

private static MvcHtmlString InputHelper(HtmlHelper htmlHelper, InputType inputType, ModelMetadata metadata, string name, object value, bool useViewData, bool isChecked, bool setId, bool isExplicitValue, string format, IDictionary<string, object> htmlAttributes)
{
    string fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
    if (string.IsNullOrEmpty(fullHtmlFieldName))
    {
        throw new ArgumentException(MvcResources.Common_NullOrEmpty, "name");
    }
    TagBuilder tagBuilder = new TagBuilder("input");
    tagBuilder.MergeAttributes<string, object>(htmlAttributes);
    tagBuilder.MergeAttribute("type", HtmlHelper.GetInputTypeString(inputType));
    tagBuilder.MergeAttribute("name", fullHtmlFieldName, true);
    string text = htmlHelper.FormatValue(value, format);
    bool flag = false;
    switch (inputType)
    {
    case InputType.CheckBox:
    {
        bool? flag2 = htmlHelper.GetModelStateValue(fullHtmlFieldName, typeof(bool)) as bool?;
        if (flag2.HasValue)
        {
            isChecked = flag2.Value;
            flag = true;
        }
        break;
    }
    case InputType.Hidden:
        goto IL_131;
    case InputType.Password:
        if (value != null)
        {
            tagBuilder.MergeAttribute("value", text, isExplicitValue);
            goto IL_16C;
        }
        goto IL_16C;
    case InputType.Radio:
        break;
    default:
        goto IL_131;
    }
    if (!flag)
    {
        string text2 = htmlHelper.GetModelStateValue(fullHtmlFieldName, typeof(string)) as string;
        if (text2 != null)
        {
            isChecked = string.Equals(text2, text, StringComparison.Ordinal);
            flag = true;
        }
    }
    if (!flag && useViewData)
    {
        isChecked = htmlHelper.EvalBoolean(fullHtmlFieldName);
    }
    if (isChecked)
    {
        tagBuilder.MergeAttribute("checked", "checked");
    }
    tagBuilder.MergeAttribute("value", text, isExplicitValue);
    goto IL_16C;
    IL_131:
    string text3 = (string)htmlHelper.GetModelStateValue(fullHtmlFieldName, typeof(string));
    tagBuilder.MergeAttribute("value", text3 ?? (useViewData ? htmlHelper.EvalString(fullHtmlFieldName, format) : text), isExplicitValue);
    IL_16C:
    if (setId)
    {
        tagBuilder.GenerateId(fullHtmlFieldName);
    }
    ModelState modelState;
    if (htmlHelper.ViewData.ModelState.TryGetValue(fullHtmlFieldName, out modelState) && modelState.Errors.Count > 0)
    {
        tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
    }
    tagBuilder.MergeAttributes<string, object>(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata));
    if (inputType == InputType.CheckBox)
    {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.Append(tagBuilder.ToString(TagRenderMode.SelfClosing));
        TagBuilder tagBuilder2 = new TagBuilder("input");
        tagBuilder2.MergeAttribute("type", HtmlHelper.GetInputTypeString(InputType.Hidden));
        tagBuilder2.MergeAttribute("name", fullHtmlFieldName);
        tagBuilder2.MergeAttribute("value", "false");
        stringBuilder.Append(tagBuilder2.ToString(TagRenderMode.SelfClosing));
        return MvcHtmlString.Create(stringBuilder.ToString());
    }
    return tagBuilder.ToMvcHtmlString(TagRenderMode.SelfClosing);
}

最佳答案

看来我错了，毕竟是 JS，虽然不是在我试图排除它的时候。重现这一点的事件序列；

public class Test
{
    public bool Sample { get; set; }
}

@model TestModelValueCase.Models.Test
@{
    ViewBag.Title = "Test Page";
}

@using (Html.BeginForm())
{
    @Html.HiddenFor(m => m.Sample)
    <div>
        <label>Hidden Value:</label>
        <span id="_uiValue"></span>
    </div>
    <button type="submit">Try Post</button>
}
@section scripts
{
    <script type="text/javascript" language="javascript">
        $(document).ready(function() {
            var source = $('#@nameof(Model.Sample)');
            $('#_uiValue').html(source.val());
            source.val(true);
        });
    </script>
}

    public ActionResult Index()
    {
        Test model = new Test();
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(Test model)
    {
        return View(model);
    }

关于c# - 不同情况下呈现的 bool 字段，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44720485/