即时创建Excel文件并将其下载/保存在客户端上

Question

问题：ASP.NET Core 1.1中以下代码的最后三行的替代方法和/或解决方法是什么？在最后三行VS2015正在抱怨HttpResponse does not contain a definition for OutputStream, Flush(), End()

背景：在我的ASP.NET Core 1.1应用中，我使用EPPlus.Core即时将数据导出到Excel并将其下载/保存在客户端。作为首发，我尝试模仿以下示例（取自here），但VS2015无法识别此代码的last 3 lines。

public void ExportListUsingEPPlus()
{
    var data = new[]{
                        new{ Name="Ram", Email="ram@techbrij.com", Phone="111-222-3333" },
                        new{ Name="Shyam", Email="shyam@techbrij.com", Phone="159-222-1596" },
                        new{ Name="Mohan", Email="mohan@techbrij.com", Phone="456-222-4569" },
                        new{ Name="Sohan", Email="sohan@techbrij.com", Phone="789-456-3333" },
                        new{ Name="Karan", Email="karan@techbrij.com", Phone="111-222-1234" },
                        new{ Name="Brij", Email="brij@techbrij.com", Phone="111-222-3333" }
                };

    ExcelPackage excel = new ExcelPackage();
    var workSheet = excel.Workbook.Worksheets.Add("Sheet1");
    workSheet.Cells[1, 1].LoadFromCollection(data, true);
    using (var memoryStream = new MemoryStream())
    {
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        Response.Headers.Add("content-disposition", "attachment;  filename=Contact.xlsx");
        excel.SaveAs(memoryStream);
        memoryStream.WriteTo(Response.OutputStream);
        Response.Flush();
        Response.End();
    }
}

Answer 1

您可以在“控制器”操作中返回FileStreamResult之一。

它返回指定fileStream中的文件，其中指定的contentType为Content-Type，指定的fileDownloadName为建议的文件名。

public virtual FileStreamResult File(Stream fileStream, string contentType, string fileDownloadName)

修改

示例操作方法 -

var data = new[]{
                        new{ Name="Ram", Email="ram@techbrij.com", Phone="111-222-3333" },
                        new{ Name="Shyam", Email="shyam@techbrij.com", Phone="159-222-1596" },
                        new{ Name="Mohan", Email="mohan@techbrij.com", Phone="456-222-4569" },
                        new{ Name="Sohan", Email="sohan@techbrij.com", Phone="789-456-3333" },
                        new{ Name="Karan", Email="karan@techbrij.com", Phone="111-222-1234" },
                        new{ Name="Brij", Email="brij@techbrij.com", Phone="111-222-3333" }
                };

            ExcelPackage excel = new ExcelPackage();
            var workSheet = excel.Workbook.Worksheets.Add("Sheet1");
            workSheet.Cells[1, 1].LoadFromCollection(data, true);

            //var memoryStream = new MemoryStream(excel.GetAsByteArray());

            //Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            //Response.Headers.Add("content-disposition", "attachment;  filename=Contact.xlsx");
            //excel.SaveAs(memoryStream);
            //memoryStream.WriteTo(Response.OutputStream);
            //Response.Flush();
            //Response.End();

            return File(excel.GetAsByteArray(), "application/vnd.ms-excel", "Contact.xlsx");

生成的Excel屏幕截图 -