Asp.net core mvc Response.ClearContent（）方法未进入Asp.net核心

给出的错误响应不包含中ClearContent的定义 Asp.net Core在网上找到了这个答案

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希望它能帮助某人

如何

响应。Clear（）？它显示了相同的问题，相同的代码在Asp.net MVC中工作得很好，但在Asp.net Core中没有。这在3.5年后对我有所帮助。谢谢
        System.IO.StringWriter objStringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter objHtmlTextWriter = new System.Web.UI.HtmlTextWriter(objStringWriter);
        gv.RenderControl(objHtmlTextWriter);



        Response.ClearContent();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment; filename=DemoExcel.xls");
        Response.ContentType = "application/ms-excel";

        Response.Charset = "";
        Response.Output.Write(objStringWriter.ToString());
        Response.Flush();
        Response.Close();

Response.Clear();
Response.Headers[HeaderNames.ContentDisposition] = "attachment; filename=DemoExcel.xls";
Response.WriteAsync(objStringWriter.ToString()).Wait()