C# 将共享部分视图呈现为字符串时出错

我使用我找到的这段代码将局部视图渲染为字符串

    public string RenderPartialViewToString(string controlName, object viewData)
    {
        ViewPage viewPage = new ViewPage() { ViewContext = new ViewContext() };
        viewPage.ViewData = new ViewDataDictionary(viewData);
        viewPage.Controls.Add(viewPage.LoadControl(controlName));

        StringBuilder sb = new StringBuilder();
        using (StringWriter sw = new StringWriter(sb))
        {
            using (HtmlTextWriter tw = new HtmlTextWriter(sw))
            {
                viewPage.RenderControl(tw);
            }
        }
        return sb.ToString();
    }

我正在像这样输入函数：

var s = RenderPartialViewToString("~/Views/Shared/_MyPartialView.cshtml", MyModel);

但我得到了以下错误：

Type 'ASP._Page_Views_Shared__MyPartialView_cshtml' does not inherit from 'System.Web.UI.UserControl'.

---

有人知道我如何修复此错误吗？

ViewPage

用于Web表单视图，而不是Razor视图

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