你好，我的学徒期结束了，我必须自己创建一个项目。我正在开发某种网站，我想添加一个功能以将Excel信息下载到Excel文件中。在我的本地Visual Studio版本上，它可以完美运行，但是当我尝试使用IIS在我的Web服务器上运行时，由于错误而崩溃，但由于我的有限知识，这至少对我没有帮助。希望这里的人能帮助解决问题。
Export Code:
using System;
using System.Net;
using System.IO;
using System.Web.UI;
using System.Data.SqlClient;
using System.Text;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
using System.Collections.Generic;
if (download_decision == "Partial")
{
//New Excel Application
Excel.Application XL = new Microsoft.Office.Interop.Excel.Application();
//Hiding Alerts and the File
XL.Visible = false;
XL.DisplayAlerts = false;
//Workbook opened
Excel.Workbook WB = XL.Workbooks.Add();
//All Sheets are selected
Excel.Sheets sheets = WB.Worksheets;
//First Worksheets selected and renamed
Excel.Worksheet WS = sheets.get_Item(1);
WS.Name = public_language;
//Name columns
(WS.Cells[1, 1] as Excel.Range).Value = public_language;
(WS.Cells[1, 2] as Excel.Range).Value = "English";
(WS.Cells[1, 1] as Excel.Range).Font.Bold = true;
(WS.Cells[1, 2] as Excel.Range).Font.Bold = true;
(WS.Cells[1, 1] as Excel.Range).HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;
(WS.Cells[1, 2] as Excel.Range).HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;
//SQL Reader
using (SqlConnection conn = new SqlConnection())
{
//SQL Server
conn.ConnectionString = sqlserver;
//Conncection establish
conn.Open();
//Get SQL Information
SqlCommand cmd = new SqlCommand("select * from" + " " + selected_table, conn);
SqlDataReader rdr = cmd.ExecuteReader();
int counter = 3;
while (rdr.Read())
{
string Source = (string)rdr["source"];
string Target = (string)rdr["target"];
//Values are written in file
(WS.Cells[counter, 1] as Excel.Range).Value = Source;
(WS.Cells[counter, 2] as Excel.Range).Value = Target;
counter++;
}
}
//Autofit Cells
Excel.Range workSheet_range = WS.get_Range("A:B");
workSheet_range.EntireColumn.AutoFit();
//Save and Close
WB.SaveAs(path);
WB.Close();
}
该错误向我显示了这一点：
Server Error in '/' Application.
Exception from HRESULT: 0x800AC472
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Runtime.InteropServices.COMException: Exception from HRESULT: 0x800AC472
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[COMException (0x800ac472): Exception from HRESULT: 0x800AC472]
System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData) +1398
Microsoft.Office.Interop.Excel.Font.set_Bold(Object ) +0
Glossary.Dashboard.Download_Click(Object sender, EventArgs e) in C:\Users\myuser\source\repos\project1\project1\Dashboard.aspx.cs:107
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +11773973
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +150
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5062
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2106.0
非常感谢您！
答案 0 :(得分：1)
@Magnetron非常感谢！你的想法很完美。我现在正在使用EPPlus。我更改了代码，作为奖励，它起作用了，并且速度大大提高了。
我的新代码以及有效的解决方案：
using OfficeOpenXml;
using OfficeOpenXml.Style;
using System.Collections.Generic;
if (download_decision == "Partial")
{
//New Excel Application
ExcelPackage excel = new ExcelPackage();
var ws = excel.Workbook.Worksheets.Add(public_language);
//Name columns
using (ExcelRange Rng = ws.Cells[1, 1])
{
Rng.Value = public_language;
Rng.Style.Font.Bold = true;
Rng.Style.HorizontalAlignment = OfficeOpenXml.Style.ExcelHorizontalAlignment.Center;
}
//Name columns
using (ExcelRange Rng = ws.Cells[1, 2])
{
Rng.Value = "English";
Rng.Style.Font.Bold = true;
Rng.Style.HorizontalAlignment = OfficeOpenXml.Style.ExcelHorizontalAlignment.Center;
}
//SQL Reader
using (SqlConnection conn = new SqlConnection())
{
//SQL Server
conn.ConnectionString = sqlserver;
//Conncection establish
conn.Open();
//Get SQL Information
SqlCommand cmd = new SqlCommand("select * from" + " " + selected_table, conn);
SqlDataReader rdr = cmd.ExecuteReader();
int counter = 3;
while (rdr.Read())
{
string Source = (string)rdr["source"];
string Target = (string)rdr["target"];
//Values are written in file
ws.Cells[counter, 1].Value = Source;
ws.Cells[counter, 2].Value = Target;
counter++;
}
}
//Autofit
ws.Column(1).AutoFit();
ws.Column(2).AutoFit();
//Save and Close
Stream stream = File.Create(path);
excel.SaveAs(stream);
stream.Close();
}
//transfer to client
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
FileInfo file = new FileInfo(path);
if (file.Exists)
{
response.Clear();
response.ClearHeaders();
response.ClearContent();
response.AddHeader("content-disposition", "attachment; filename=" + filename);
response.AddHeader("content-type", "application/excel");
response.ContentType = "application/vnd.xls";
response.AddHeader("content-length", file.Length.ToString());
response.WriteFile(file.FullName);
response.Flush();
response.Close();
}
//file deleting
File.Delete(path);