Question

我在Excel文档中下载数据时收到错误Worksheet names cannot be empty。以下是我的错误

的代码

protected void btnDownloadExcel_OnClick(object sender, EventArgs e)
{
    try
    {
        DataTable dt = GetReportData();
        if (dt.Rows.Count > 0)
        {
            string fileName = drpReports.SelectedItem.ToString();
            using (XLWorkbook excel = new XLWorkbook())
            {
                //error from below line
                excel.Worksheets.Add(dt);
                excel.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
                excel.Style.Font.Bold = true;
                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("content-disposition", "attachment;filename=" + fileName + ".xlsx");

                using (var myMemoryStream = new MemoryStream())
                {
                    excel.SaveAs(myMemoryStream);
                    myMemoryStream.WriteTo(Response.OutputStream);
                    Response.Flush();
                    HttpContext.Current.Response.End();
                }
            }
        }
        else
        {
            ScriptManager.RegisterStartupScript(Page, Page.GetType(), "err_msg", "<script language='javascript'>alert('No records found. Please check the selection criteria.');</script>", false);

        }
    }
    catch (Exception ex)
    {
        ScriptManager.RegisterStartupScript(Page, Page.GetType(), "err_msg", "<script language='javascript'>alert('Oops..!! some error occured. Please contact to administrator.');</script>", false);
        log4net.ThreadContext.Properties["loginid"] = LoggedInUserDetails.LoginId.ToString();
        Log.Error(ex.Message, ex);
    }

}

我在将excel.Worksheets.Add(dt);添加到Excel时，Datatable收到错误消息。有人能告诉我我在哪里做错了。

Answer 1

在尝试添加没有表名的DataTable时，我能够看到上述问题。当我尝试使用带有表名的DataTable时，它运行正常。在这种情况下，DataTable名称将保留为工作表的名称。

using ClosedXML.Excel;
using System;
using System.Data;

namespace ClosedXML_Test
{
class Program
{
    /// <summary>
    /// This example method generates a DataTable.
    /// </summary>
    static DataTable GetTable()
    {
        DataTable table = new DataTable("Test");//DataTable with name - works fine
        //DataTable table = new DataTable("Test"); //DataTable without name - issue reproduced as you mentioned
        table.Columns.Add("Dosage", typeof(int));
        table.Columns.Add("Drug", typeof(string));
        table.Columns.Add("Patient", typeof(string));
        table.Columns.Add("Date", typeof(DateTime));

        // Here we add five DataRows.
        table.Rows.Add(25, "Indocin", "David", DateTime.Now);
        table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
        table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
        table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
        table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
        return table;
    }
    static void Main(string[] args)
    {
        var workbook = new XLWorkbook();
        var worksheet = workbook.Worksheets.Add(GetTable());
        workbook.SaveAs("Sample.xlsx");
        workbook.Dispose();

        System.Diagnostics.Process.Start("Sample.xlsx");
    }
}
}

Answer 2

protected void btnDownloadExcel_OnClick(object sender, EventArgs e)
    {
        try
        {
            DataTable dt = GetReportData();
            if (dt.Rows.Count > 0)
            {
                string fileName = drpReports.SelectedItem.ToString();
                string attachment = "attachment;filename=" + fileName + ' ' + DateTime.Now.ToShortDateString() + ".xlsx";
                Response.ClearContent();
                Response.AddHeader("content-disposition", attachment);
                Response.ContentType = "application/vnd.ms-excel";
                string tab = "";
                foreach (DataColumn dc in dt.Columns)
                {
                    Response.Write(tab + dc.ColumnName);
                    tab = "\t";
                }
                Response.Write("\n");
                int i;
                foreach (DataRow dr in dt.Rows)
                {
                    tab = "";
                    for (i = 0; i < dt.Columns.Count; i++)
                    {
                        Response.Write(tab + dr[i].ToString());
                        tab = "\t";
                    }
                    Response.Write("\n");
                }
                HttpContext.Current.Response.Flush(); // Sends all currently buffered output to the client.
                HttpContext.Current.Response.SuppressContent = true;  // Gets or sets a value indicating whether to send HTTP content to the client.
                HttpContext.Current.ApplicationInstance.CompleteRequest(); // Causes ASP.NET to bypass all events and filtering in the HTTP pipeline chain of execution and directly execute the EndRequest event.

            }


            else
            {
                ScriptManager.RegisterStartupScript(Page, Page.GetType(), "err_msg", "<script language='javascript'>alert('No records found. Please check the selection criteria.');</script>", false);

            }
        }
        catch (Exception ex)
        {
            ScriptManager.RegisterStartupScript(Page, Page.GetType(), "err_msg", "<script language='javascript'>alert('Oops..!! some error occured. Please contact to administrator.');</script>", false);
            log4net.ThreadContext.Properties["loginid"] = LoggedInUserDetails.LoginId.ToString();
            Log.Error(ex.Message, ex);
        }

    }

Answer 3

添加

YourDataTableName.TableName = "Enter_a_Name_same_as_Excelsheetname";

在宣布您的

之前

XLWorkbook excel= new XLWorkbook()

或

 var ws= excel.Worksheets.Add(table);    
 ws.Name="Enter_a_Name_same_as_Excelsheetname";

工作表名称不能为空

3 个答案: