.net 保存 excel 文件

问题描述

我不明白是什么问题，我正在从上传文件夹中读取 excel 文件，然后我想更新该文件并将其另存为新的 xlxs 文件

错误异常详细信息：System.Runtime.InteropServices.COMException：无法访问“System.IO.MemoryStream”。

Excel.Application xlApp = new
Microsoft.Office.Interop.Excel.Application();

Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
path = System.IO.Path.Combine(Server.MapPath("~/Uploads/Contactless.xls"));
xlWorkBook = xlApp.Workbooks.Open(path);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet.Cells[2,1] = "will test sheet";
using (var stream  = new MemoryStream())
{
    xlWorkBook.SaveAs(stream);
    var content = stream.ToArray();
    return File(content,"application/vnd.openxmlformats-officedocument-spreadsheetml.sheet","contactless.xlsx");

} 

解决方法

我认为您最终需要清理 InteropServices。

xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Open(sFile);
            xlWorkSheet = xlWorkBook.Worksheets["Sheet1"];

            xlWorkSheet.Cells[2,1] = "will test sheet";

           
            xlWorkBook.Close();
            xlApp.Quit();

            // CLEAN UP.
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkBook);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkSheet);