我正在Asp.netVisual Studio Enterprise 2019中使用www.example.com核心Razor Pages C#构建一个应用程序。我想向现有应用程序添加日历应用程序。我在Pages文件夹下的Calendars文件夹中添加了一个名为CRUDPartial.cshtml的表单。
但是，在第一行代码中会抛出一个错误，并且BeginForm以红色突出显示：

@using (Html.BeginForm(Model.ActionName, Paths.INDEX_PATH, new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
    @Html.AntiForgeryToken()

    <div class="well bs-component custom-background2">
        <div class="row" style="display:none;">
            <div class="form-group">
                <div class="col-md-10 col-md-pull-1">
                    @Html.HiddenFor(m => m.Event_id, new { @readonly = "readonly", placeholder = Html.DisplayNameFor(m => m.Event_id), @class = "form-control" })
                    @Html.HiddenFor(m => m.IsView, new { @readonly = "readonly", placeholder = Html.DisplayNameFor(m => m.IsView), @class = "form-control" })
                    @Html.HiddenFor(m => m.ButtonText, new { @readonly = "readonly", placeholder = Html.DisplayNameFor(m => m.ButtonText), @class = "form-control" })
                    @Html.HiddenFor(m => m.StartDateTime, new { id = "startDateVal", @readonly = "readonly", placeholder = Html.DisplayNameFor(m => m.StartDateTime), @class = "form-control" })
                    @Html.HiddenFor(m => m.EndDateTime, new { id = "endDateVal", @readonly = "readonly", placeholder = Html.DisplayNameFor(m => m.EndDateTime), @class = "form-control" })
                </div>
            </div>
        </div>

错误消息为：
CS 7036：-没有给定与“IHtmlHelper.BeginForm（string，string，object，FormMethod，bool？，object）”所需形参“htmlAttributes”对应的实参
当我建置方案时，建置的输出会在下列位置掷回错误消息：-完成建置项目“ProjectName.csproj”--失败。
随后会显示更多错误消息：- CS 0246-找不到类型或命名空间名称“PrivacyModel”（是否缺少using指令或程序集引用？）
错误消息出现在以下代码行：

public global::Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<PrivacyModel> Html { get; private set; }
public global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<PrivacyModel> ViewData => (global::Microsoft.AspNetCore.Mvc.ViewFeatures.ViewDataDictionary<PrivacyModel>)PageContext?.ViewData;

任何帮助解决这些问题将不胜感激。