c# - 从 ASP.NET 页面下载 EXCEL 文件，无需在服务器上生成物理文件(动态)

Question

我正在尝试使用 Microsoft Office EXCEL INTEROP 即时将 C# DataTable 导出到 EXCEL 文件(不创建物理文件)，并通过 Response 对象通过 asp.net 网页下载它。我能够使用库生成内存流但是不知何故文件没有通过内存流保存。引用代码如下。您将需要引用 DocumentFormat.OpenXml.dll 和 WindowsBase.DLL(您可以从 Microsoft 站点下载)。

知道如何解决这个问题吗？ ？ ？

Private void DownloadFile()
{
                DataSet objTable = ReadTableFromViewstate();
            if (objTable != null && objTable.Rows.Count > 0)
            {

                string strDownloadableFilename = "TestExcelFileName.xls";
                MemoryStream fs1 = new MemoryStream();
                if (CreateExcelFile.CreateExcelDocument(objTable, fs1))
                {
                    Response.Clear();
                        byte[] data1 = new byte[fs1.Length];
                        fs1.Read(data1, 0, data1.Length);
                        fs1.Close();

                    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                    Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", strDownloadableFilename));
                    Response.BinaryWrite(data1); ;
                   Response.End();

                }
                else
                {
                    LblErrorMessage.Text = "Error Exporting File.";
                }
            }

        }

..

public static bool CreateExcelDocument(DataSet ds, System.IO.Stream excelFileStream)
    {
        try
        {
            using (SpreadsheetDocument document = SpreadsheetDocument.Create(excelFileStream, SpreadsheetDocumentType.Workbook))
            {
                CreateParts(ds, document);
            }

            Trace.WriteLine("Successfully created: " + excelFileStream);
            return true;
        }
        catch (Exception ex)
        {
            Trace.WriteLine("Failed, exception thrown: " + ex.Message);
            return false;
        }
    }
..




private static void CreateParts(DataSet ds, SpreadsheetDocument document)
        {
            WorkbookPart workbookPart = document.AddWorkbookPart();
            Workbook workbook = new Workbook();
            workbookPart.Workbook = workbook;

            //  If we don't add a "WorkbookStylesPart", OLEDB will refuse to connect to this .xlsx file !

                WorkbookStylesPart workbookStylesPart = workbookPart.AddNewPart<WorkbookStylesPart>("rIdStyles");
            Stylesheet stylesheet = new Stylesheet();

            workbookStylesPart.Stylesheet = stylesheet;

            Sheets sheets = new Sheets();

            //  Loop through each of the DataTables in our DataSet, and create a new Excel Worksheet for each.
        uint worksheetNumber = 1;
        foreach (DataTable dt in ds.Tables)
        {
            //  For each worksheet you want to create
            string workSheetID = "rId" + worksheetNumber.ToString();
            string worksheetName = dt.TableName;

            WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>(workSheetID);
            WriteDataTableToExcelWorksheet(dt, worksheetPart);

            Sheet sheet = new Sheet() { Name = worksheetName, SheetId = (UInt32Value)worksheetNumber, Id = workSheetID };
            sheets.Append(sheet);

            worksheetNumber++;
        }

        workbook.Append(sheets);
    }

Answer 1

感谢大家，终于我得到了我的问题的解决方案。我刚刚替换了以下代码行:

                    byte[] data1 = new byte[fs1.Length];
                    fs1.Read(data1, 0, data1.Length);
                    fs1.Close();

用这条线

                    byte[] data1 = fs1.ToArray();

我的问题得到了解决。