Question

我编写了以下代码将数据导出到excel。此代码在本地工作正常，但是当我们在服务器（UAT）上部署此代码时，它不起作用。如果我们重新启动服务器，它会工作一段时间，但一段时间后它会失败。

代码：

public void ExportToExcelFunction(string FlName, DataTable mydt, string DispColName, string BindCols)
    {
        Excel.Application xlObj = new Excel.Application();
        object oMissing = System.Reflection.Missing.Value;
        xlObj.Visible = false;
        //vinod
        string filepath = Server.MapPath("Export");
        string strFlName = filepath + "\\Master.xlsx";

        Excel.Workbook xlWB = xlObj.Workbooks.Open(strFlName, 0, true, 5, "", "", false, Excel.XlPlatform.xlWindows, "", true, true, 0, true);
        Excel.Worksheet xlSheet = (Excel.Worksheet)xlWB.ActiveSheet;

        int cols = mydt.Columns.Count;
        int rows = mydt.Rows.Count;

        //Added for export to excel
        try
        {
            //For Column
            string[] strCols = DispColName.Split(',');
            for (int i = 1; i <= strCols.Length; i++)
            {
                if (strCols[i - 1].Length > 0 && strCols[i - 1] != null)
                    xlSheet.Cells[1, i] = Convert.ToString(strCols[i - 1]);
            }

            // for Row   
            string[] strColBind = BindCols.Split(',');
            for (int r = 0; r < rows; r++)
            {
                for (int c = 0; c < strColBind.Length; c++)
                {
                    xlSheet.Cells[r + 2, c + 1] = mydt.Rows[r][strColBind[c]];
                }
            }
        }
        catch (Exception ex)
        {
        }


        String newFlName = "\\" + DateTime.Now.Ticks.ToString() + "_" + FlName + ".xls";
        xlWB.SaveAs(filepath + newFlName, Excel.XlFileFormat.xlWorkbookNormal, "", "", false, false, Excel.XlSaveAsAccessMode.xlExclusive, true, false, "", true);

        xlWB.Close(true, oMissing, oMissing);
        xlObj.Quit();

        System.IO.FileInfo file = new System.IO.FileInfo(@"" + filepath + newFlName + "");
        Response.Clear();
        Response.ClearHeaders();
        Response.ClearContent();
        Response.AppendHeader("Content-Disposition", "attachment; filename = " + FlName + ".xls");
        Response.AppendHeader("Content-Length", file.Length.ToString());
        Response.ContentType = "application/download";
        Response.WriteFile(file.FullName);
        Response.Flush();
        Response.Close();
        Response.End();

    }

Answer 1

你应该知道两件事。

首先，您的代码似乎使用Excel Interop Services，因此需要在服务器上安装Excel。

第二件事是Microsoft不支持在服务器端使用Excel Interop Services，for a number of good reasons。

相反，我建议使用替代库，例如EPPlus或Open Office XML SDK，这两个库都可以在服务器端运行。

在服务器上部署时，代码不起作用

1 个答案: