OpenXML SpreadsheetDocument SaveAs() 给出文件使用错误

Question

我正在尝试使用从 ASP.Net Core Web 应用程序调用的 OpenXMLPowerTools v4.5.3.2、DocumentFormat.OpenXML v2.9.1 动态生成 Excel 电子表格。

我已经验证可以生成电子表格了。

问题是我需要生成电子表格......并将其作为 MEMORY STREAM 返回（因此 ASP.Net Core Web 控制器

HCExcelReport.cs：

   class HCExcelReport
    {
        protected SpreadsheetDocument doc;
        protected MemorySpreadsheet ms;
        protected string tmpFile = System.IO.Path.GetTempFileName();

        public MemoryStream Generate(List<CandidateRecords> candidateRecords)
        {
            MemoryStream memoryStream = null;
            using (OpenXmlMemoryStreamDocument streamDoc = OpenXmlMemoryStreamDocument.CreateSpreadsheetDocument())
            {
                doc = streamDoc.GetSpreadsheetDocument();
                ms = new MemorySpreadsheet();

                ...
                // Save to disk=
                doc.SaveAs(tmpFile);  // <-- Successfully writes .. but file remains open
                doc.Dispose();   // <-- file *STILL* remains open
            }

            // Copy to memory stream
            using (FileStream fileStream = new FileStream(tmpFile, FileMode.Open, FileAccess.Read))  // <-- Exception: the file is in use by another process!!!!
            {
                memoryStream = new MemoryStream();
                fileStream.CopyTo(memoryStream);
                memoryStream.Position = 0;
            }
            return memoryStream;

我尝试了无数的东西......

...但是如果我使用 PowerTools，我看不到任何替代 doc.SaveAs()...

...如果我使用doc.SaveAs()，该文件似乎会一直“使用中”，直到我的网络应用退出。

问：有什么建议吗？

Answer 1

请看这个帖子How to copy a file while it is being used by another process

// Copy to memory stream
using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
    memoryStream  = new MemoryStream();
    fs.CopyTo(memoryStream );
    fs.Close();
}
return memoryStream;

问候马塞尔