在C＃中导出到excel并显示错误，而不下载excel

Question

My code, where the collection of values retrived from DB and that values stored one by one in datatable.And loading that dataTable to worksheet of Excel

var dataTable = new DataTable();
var sb = new StringBuilder();
var resultvalues=methodtogetvalues() ;


if (resultvalues!= null && resultvalues.Count > 0)
{
    var icount = 1;

    foreach (var values in resultvalues)
    {
        if (icount == 1)
        {
            sb.Append(values.Id);
            icount += 1;
        }

        dataTable.Columns.Add("ID");
        dataTable.Rows.Add(values.Id);
    }
}

var firstName = context.Request.Params["FirstName"];
var lastName = context.Request.Params["LastName"];
var fileName = firstName+lastName+"_ProgramStatusHistory_"+DateTime.Now;

var tempText = Convert.ToString(sb);
var workBook = new ExpertXls.ExcelLib.ExcelWorkbook(ExpertXls.ExcelLib.ExcelWorkbookFormat.Xlsx_2007);
var accessedRangeStyle = workBook.Styles.AddStyle("ΑccessedRangeStyle");
accessedRangeStyle.Font.Size = 10;
accessedRangeStyle.Font.Bold = true;
accessedRangeStyle.Alignment.VerticalAlignment = ExpertXls.ExcelLib.ExcelCellVerticalAlignmentType.Center;
accessedRangeStyle.Alignment.HorizontalAlignment = ExpertXls.ExcelLib.ExcelCellHorizontalAlignmentType.Left;
workBook.Worksheets.AddWorksheet();

var workSheet = workBook.Worksheets[0];
workSheet.LoadDataTable(dataTable, 1, 1, true);
workSheet.AutofitColumns();
workBook.Worksheets.RemoveWorksheet("Sheet2");
workBook.Worksheets.RemoveWorksheet("Sheet3");
workBook.Worksheets.RemoveWorksheet("Sheet4");
workBook.LicenseKey = "gqmworCworOysrWitKyyorGzrLOwrLu7u7s=";

context.Response.Clear();
context.Response.Buffer = true;
context.Response.Charset = "";
context.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
context.Response.AddHeader("content-disposition", "attachment;filename=" + fileName);

using (var MyMemoryStream = new System.IO.MemoryStream())
{
    workBook.Save(MyMemoryStream);
    MyMemoryStream.WriteTo(context.Response.OutputStream);
    context.Response.Flush();
    context.Response.End();
}

This code simply shows an alert box with the error message "Error".

I don't understand whats wrong. Can anyone redirect me with correct way.

Answer 1

I would move this line of code outside the using statement:

context.Response.End();

also show your catch block. It's unlikely to be giving just a message of 'Error' I would suggest placing a breakpoint in the catch block and looking inside the error object.