in my application i have bind sql data source to grid view, on click of export button i took gridviews datasource in datatable and created webControl table and write that control to xls file. but i am getting follwowing error:
Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.
My code is as follows:
HttpResponse Response = HttpContext.Current.Response;
Response.Clear();
string StudNm = Request["hidStudnm"];
Response.AddHeader("content-disposition", "attachment;filename=" + "StudentPasswordReport" + ".xls");
Response.Charset = "";
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
System.Web.UI.WebControls.Table tblRept;
tblRept = CreateTable(exportDt);
tblRept.RenderControl(htmlWrite);
please tell me why this error is occurred and how can i resole this error
You could try this
DataTableToExcel(exportDt);
private void DataTableToExcel(DataTable dataTable)
{
StringWriter writer = new StringWriter();
HtmlTextWriter htmlWriter = new HtmlTextWriter(writer);
GridView gridView = new GridView();
gridView.DataSource = dataTable;
gridView.AutoGenerateColumns = true;
gridView.DataBind();
gridView.RenderControl(htmlWriter);
htmlWriter.Close();
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
Response.Charset = "";
Response.Write(writer.ToString());
Response.End();
}
Related
Currently my method is use for export excel file from gridview. Now I want to create dropdown list in some column for each row of excel file. It's possible to do with StringWriter?
There is my code of the method...
string exportFileName = Session["corpUser"].ToString() + "_ProjectExport_" + unixTimestamp + ".xls";
//Create a dummy GridView
GridView dummyGridView = new GridView();
dummyGridView.AllowPaging = false;
dummyGridView.DataSource = dt;
dummyGridView.DataBind();
//Write Dummy Gridview to Excel File
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" + exportFileName);
Response.ContentType = "application/ms-excel";
Response.ContentEncoding = System.Text.Encoding.Unicode;
Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble());
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(sw);
dummyGridView.RenderControl(hw);
Response.Write(sw.ToString());
Response.End();
I want to export all bind repeater data in single excel file.
Using this code only first page of repeater is exporting but I want the whole repeater data.
This is my C# code:
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=Detail.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
rptrdata.RenderControl(htmlWrite);
Response.Write("<table>");
Response.Write(stringWrite.ToString());
Response.Write("</table>");
Response.End();
Ensure that the records that binds in the repeater has all the page values or that current page values.
I want to export a list with over 10000 rows to excel using MVC5 C#.
when I export using DataGrid some columns are not shown in the excel file - 3 columns are disapeard in the excel file but all the 10000 rows appeard.
string filename = Guid.NewGuid() + ".xls";
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
DataGrid dgGrid = new DataGrid();
List registrationsetList = db.RegistrationSet.Where(x => x.QuestionId == TheQuestion.Id).ToList();
dgGrid.DataSource = registrationsetList;
dgGrid.DataBind();
dgGrid.RenderControl(hw);
Response.BinaryWrite(System.Text.Encoding.UTF8.GetPreamble());
Response.ContentType = "application/vnd.ms-excel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
Response.Write(tw.ToString());
Response.End();
If I change DataGrid dgGrid = new DataGrid()
to GridView dgGrid = new GridView();
with list of 600 of rows, the excel looks perfect with all the columns.
the problem is when i export all the list of 10000 rows, the excel file got stuck - i got not responding message.
why ?
Instead of using a DataGrid() try using a WebControl GridView():
string filename = Guid.NewGuid() + ".xls";
var gv = new System.Web.UI.WebControls.GridView();
var registrationsetList = db.RegistrationSet.Where(x => x.QuestionId == TheQuestion.Id);
g.DataSource = registrationsetList;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=" + filename);
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWiter sw = new StringWriter();
var htw = new System.Web.UI.HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
The problem (with that stucked excel file) was solved with DataGrid. The problem was that the DateGrid doen't show columns of nullable fields in the CLASS in the list that i bound to the GridView.
I have a code that will generate an excel report.i am using ASP.NET MVC 4. I googled and found the same code everywhere still my code is not working why. My code in controller is as:
public ActionResult ExportData()
{
string[] abc = { "AAA", "BBB", "CCC" };
GridView gv = new GridView();
gv.DataSource = abc;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=Marklist.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
return RedirectToAction("_EligibilityCriteria");
}
Just to test the export functionality I used an array abc this code is working in .net application but not in ASP.NET MVC 4 application. I have debugged the code but not found a problem or error in code.
What am I doing wrong here?
Finally found a way to export to excel.
public void ExportIniEmployeeToExcel(EligibilityCriteriaModel AllIniEmp)
{
List<AllIniEmployees> emp = new List<AllIniEmployees>();
AllIniEmp.allSuccessEmployeeList.ForEach(x =>
{
AllIniEmployees allEmp = new AllIniEmployees();
allEmp.EmployeeCode = x.EmployeeCode;
allEmp.EmployeeName = x.EmployeeName;
allEmp.Designation = x.Designation;
allEmp.DeliveryTeam = x.DeliveryTeam;
allEmp.ConfirmationDate = x.ConfirmationDate;
emp.Add(allEmp);
});
GridView gv = new GridView();
gv.DataSource = emp;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=InitiatedEmployees.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
here i used parent class as a parameter and used linq.now its working perfectly fine.
thank you all.
You can't just write the output with a StringWriter. After your call to RenderControl, write:
byte[] byteArray = Encoding.ASCII.GetBytes(sw.ToString());
MemoryStream s = new MemoryStream(byteArray);
StreamReader sr = new StreamReader(s, Encoding.ASCII);
Response.Write(sr.ReadToEnd());
Response.End();
Try returning a ContentResult instead of writing directly to the output stream.
I stuck in the issue of exporting excel it gives error System.OutOfMemoryException in excel 2007 we cam export 1000000 rows but while exporting more then 250000 rows its gives the error the logic to upload the excel as i am using is
Response.Clear();
Response.Charset = "";
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";
string FileName = "PoliciesDetailsForBranch";
Response.AppendHeader("content-disposition", "attachment; filename=" + FileName + ".xls");
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(sw);
GridView gv = new GridView();
this.EnableViewState = false;
gv.DataSource = (DataTable)dt;
gv.DataBind();
this.ClearControls(gv);
gv.RenderControl(hw);
Response.Write(sw.ToString());
Response.End();
Can any one give me the solution to cope up with this issue.
Instead of using a StringBuilder and causing the whole thing to be converted to a string in memory, send it directly to the Response.Output.
Response.Buffer = true;//left unmodified, but why were you buffering?
Response.ContentType = "application/vnd.ms-excel";
string FileName = "PoliciesDetailsForBranch";
Response.AppendHeader("content-disposition", "attachment; filename=" + FileName + ".xls");
GridView gv = new GridView();
this.EnableViewState = false;
gv.DataSource = (DataTable)dt;
gv.DataBind();
this.ClearControls(gv);
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(Response.Output);
gv.RenderControl(hw);
Response.End();