Question

第一次它正常工作，但第二次同样的文件上传它显示此错误：

The process cannot access the file 'D:....\UploadedFiles\FileName.xls' because it is being used by another process.

这是我的代码：

 public ActionResult ImportExcel1()
 {
    try
    {
        string path1 = string.Format("{0}/{1}", Server.MapPath("~/UploadedFiles"), Request.Files["FileUpload1"].FileName);
        if (System.IO.File.Exists(path1)) {
            System.IO.File.Delete(path1);
        }
        Request.Files["FileUpload1"].SaveAs(path1);

        Excel.Application xlApp = new Excel.Application();
        Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(path1);
        Excel.Worksheet xlSheet = xlWorkbook.Sheets[1]; // get first sheet
        Excel.Range xlRange = xlSheet.UsedRange; // get the entire used range


        int numberOfRows = xlRange.Rows.Count;
        int numberOfCols = xlRange.Columns.Count;

        string slNo = "";
        string batchCode = "";
        string name = "";
        string districtName = "";
        string rollNo = "";
        List<int> columnsToRead = new List<int>();

        for (int i = 1; i <= numberOfCols; i++)
        {
            //if (xlRange.Cells[1, i].Value2 != null) // ADDED IN EDIT
            //{

                columnsToRead.Add(i);
            //}
        }

        for (int j = 1; j <= numberOfRows; j++)
        {

            //if (xlRange.Cells[1, j].Value2 != null) // ADDED IN EDIT
            //{
            //if (xlRange.Cells[1, i].Value2.ToString().Equals("Currency Code"))
            //{
            //    columnsToRead.Add(i);
            //}
            List<int> rowsToRead = new List<int>();
            rowsToRead.Add(j);
            foreach (int c in columnsToRead)
            {
                // start at 2 because the first row is 1 and the header row
                foreach (int r in rowsToRead)
                {
                    //if (xlRange.Cells[r, c].Value2 != null) // ADDED IN EDIT
                    //{
                    List<string> columnValue = new List<string>();
                    if (xlRange.Cells[r, c].Value2 == null) // ADDED IN EDIT
                    {
                        string x = "";
                        x = (xlRange.Cells[r, c].Value2) = "";
                        columnValue.Add(x);
                    }
                    else {
                        columnValue.Add(xlRange.Cells[r, c].Value2.ToString());
                    }

                    if (c.ToString() == "1") {
                        slNo = columnValue[0].ToString();
                    }
                    if (c.ToString() == "2") {
                        batchCode = columnValue[0].PadLeft(4, '0').ToString();
                    }
                    if (c.ToString() == "3") {
                        name = columnValue[0].ToString();
                    }
                    if (c.ToString() == "4") {
                        districtName = columnValue[0].ToString();
                    }
                    if (c.ToString() == "5") {
                        rollNo = columnValue[0].ToString();
                    }
                }
                if (j > numberOfRows) {
                    break;
                }
            }
            SaveData(slNo, batchCode, name, districtName, rollNo);
        }

        xlApp.Workbooks.Close();
    }
    catch (Exception e) {
    }

    return RedirectToAction("Import");
}

Answer 1

.xls文件未正确关闭。

xlWorkbook.Close(true, Type.Missing, Type.Missing); //Close() should have
//parameters based on your requirements.
xlApp.Workbooks.Close();

也可以使用finally块进行适当的清理。

代码不会在MVC中正确处理第二次上传

1 个答案: