发送HTTP标头后，服务器无法清除标头
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为了下载文件，我已经编写了以下代码
[AcceptVerbs(HttpVerbs.Post | HttpVerbs.Get)] public ActionResult Download(string fileName) {
try {
string filepath = @"C:shadow_copy.rar";
Response.ClearHeaders();
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename= " + fileName.TrimEnd());
Response.AddHeader("Content-Length", fileName.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.WriteFile(filepath.TrimEnd());
Response.End();
}
catch (Exception exp)
{
//
}
return Redirect("http://mysite.com");
}
我也用过
if（！Response.IsRequestBeingRedirected）//不会被称为Response.Redirect（“http://www.google.com”）
但它显示错误
“在发送HTTP标头后无法重定向。”
答案
下载文件后无法重定向，您尝试执行2个只能执行第一个操作的操作。
我建议您在新的（弹出窗口）窗口中下载文件，并根据需要重定向主页面。
另一答案
试试这样，它有点容易：
[AcceptVerbs(HttpVerbs.Post | HttpVerbs.Get)]
public ActionResult Download(string fileName)
{
string filepath = @"C:shadow_copy.rar";
return File(filepath, "application/octet-stream", "shadow_copy.rar");
}
此外，您无法在下载后重定向。
另一答案
下载多个excel文件时出现此异常。第一个文件下载成功，但第二个文件下载时间得到此异常。我是按照代码编写的。
public ActionResult CmsBulkUploadDownloadExcelSelectedTemplateForGpro(int CmsYear, string TinsList)
{
var username = CurrentUser.UserName;
List<string> TinList = TinsList.Split('|').ToList();
DataTable dt = new DataTable();
if (TinList.Count <= 0)
{
// Need Select Aleast one Tin
}
else
{
dt.Columns.Add("Tin", typeof(string));
foreach (var item in TinList)
{
DataRow dr = dt.NewRow();
dr["Tin"] = item;
dt.Rows.Add(dr);
}
}
List<CMSFacilityData> list = new List<CMSFacilityData>();
list = FacilityCMSSubmissionBL.GetQMSelectedTinsMeasures(CmsYear, dt)
ViewBag.ex = "";
var iteratecount = Math.Ceiling(Convert.ToDecimal(list.Count) / 4);
var skip = 0;
var next = 4;
for (int x = 0; x < iteratecount; x++)
{
try
{
var list1 = list.Skip(skip).Take(next).ToList();
string myName = Server.UrlEncode("MIPS" + "_" + DateTime.Now.ToString("yyyyMMdd-HHmmss-") + Convert.ToString(x+1)+".xlsx");
var strAppPath = System.Web.HttpRuntime.AppDomainAppVirtualPath.ToString();
if (strAppPath == "/")
{
strAppPath = "";
}
var workbook = new XLWorkbook();
var worksheet = workbook.Worksheets.Add("PQRS Excel Data");
// This is to ensure that this column is text
worksheet.Column(1).Style.NumberFormat.Format = "@";
worksheet.Column(2).Style.NumberFormat.Format = "@";
worksheet.Column(3).Style.NumberFormat.Format = "@";
worksheet.Column(4).Style.NumberFormat.Format = "@";
worksheet.Column(5).Style.NumberFormat.Format = "@";
worksheet.Column(6).Style.NumberFormat.Format = "@";
worksheet.Column(7).Style.NumberFormat.Format = "@";
worksheet.Column(8).Style.NumberFormat.Format = "@";
worksheet.Column(9).Style.NumberFormat.Format = "@";
worksheet.Column(10).Style.NumberFormat.Format = "@";
worksheet.Column(11).Style.NumberFormat.Format = "@";
worksheet.Column(12).Style.NumberFormat.Format = "@";
worksheet.Column(13).Style.NumberFormat.Format = "@";
/// worksheet.Column(13).Style.NumberFormat.Format = "@";
//worksheet.Column(10).Style.NumberFormat.Format = "@";
// worksheet.Column(1).Style.NumberFormat.Format = "mm/dd/yyyy hh:mm:ss";
var i = 1; //max 1048576
do
{
var r = worksheet.Row(i);
for (int c = 1; c < 14; c++)
{
r.Cell(c).SetDataType(XLCellValues.Text);
// r.Cell(c).SetValue("");
var j = i - 1;
switch (c)
{
case 1:
//TIN 1
r.Cell(c).SetValue(Convert.ToString(list1[j].TINNum));
break;
case 2:
///Measure Number -2
r.Cell(c).SetValue(Convert.ToString(list1[j].Mes_Number));
break;
case 3:
///Total_numberof_Exams_mygroup_performed -3
r.Cell(c).SetValue(Convert.ToString(list1[j].measCount));
break;
case 4:
///Number_of_Exams_Submitted_OLD -4
r.Cell(c).SetValue(Convert.ToString(list1[j].RecordsCount));
break;
case 5:
///Number_of_Exams_Submitted_NEW -5
r.Cell(c).SetValue("");
break;
case 6:
///Submitted_Hundred_Percent_OLD -6
r.Cell(c).SetValue(Convert.ToString(list1[j].HundredPercentOfSubmit != null ? (list1[0].HundredPercentOfSubmit == true ? "Y" : "N") : ""));
break;
case 7:
///Submitted_Hundred_Percent_NEW -7
r.Cell(c).SetValue("");
break;
case 8:
///Selected_for_CMS_submission_OLD -8
r.Cell(c).SetValue(Convert.ToString(list1[j].SelectedForCMS != null ? (list1[0].SelectedForCMS == true ? "Y" : "N") : ""));
break;
case 9:
///Selected_for_CMS_submission_NEW -9
r.Cell(c).SetValue("");
break;
case 10:
///Performance_rate -10
r.Cell(c).SetValue(Convert.ToString(list1[j].Performance_rate));
break;
case 11:
///Decile -11
r.Cell(c).SetValue(Convert.ToString(list1[j].Decile_Val));
break;
case 12:
///Completeness -12
r.Cell(c).SetValue(Convert.ToString(list1[j].Reporting_Rate));
break;
case 13:
///isEndtoEndReported -12
r.Cell(c).SetValue(Convert.ToString(list1[j].isEndtoEndReported == true ? "Y" : "N"));
break;
default:
break;
}
}
i++;
} while (i < list1.Count);
var k = list1.Count;
if (list1.Count <= 100000)
do
{
var r = worksheet.Row(k);
for (int c = 1; c < 13; c++)
{
r.Cell(c).SetDataType(XLCellValues.Text);
r.Cell(c).SetValue("");
}
k++;
}
while (k < 100000);
worksheet.Cell("A1").Value = "TIN";
worksheet.Cell("B1").Value = "Measure_Number";
worksheet.Cell("C1").Value = "Total_numberof_Exams_mygroup_performed";
worksheet.Cell("D1").Value = "Number_of_Exams_Submitted_OLD";
worksheet.Cell("E1").Value = "Number_of_Exams_Submitted_NEW";
worksheet.Cell("F1").Value = "Submitted_Hundred_Percent_OLD";
worksheet.Cell("G1").Value = "Submitted_Hundred_Percent_NEW";
worksheet.Cell("H1").Value = "Selected_for_CMS_submission_OLD";
worksheet.Cell("I1").Value = "Selected_for_CMS_submission_NEW";
worksheet.Cell("J1").Value = "Performance_rate";
worksheet.Cell("K1").Value = "Decile";
worksheet.Cell("L1").Value = "Completeness";
worksheet.Cell("M1").Value = "EndtoEndReporting";
//worksheet.Cell("M1").Value = "Measure_Extension_Num";
//worksheet.Cell("N1").Val以上是关于发送HTTP标头后，服务器无法清除标头的主要内容，如果未能解决你的问题，请参考以下文章
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