OpenXML SpreadsheetDocument SaveAs() 给出正在使用的文件错误

Question

我正在尝试使用 OpenXMLPowerTools v4.5.3.2、DocumentFormat.OpenXML v2.9.1 动态生成 Excel 电子表格，从 ASP.Net 核心网络应用调用。

我已经确认能够生成电子表格。

问题是我需要生成电子表格...并且return它作为内存流（所以ASP.Net核心网络控制器

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;

我尝试过无数种方法...

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

的任何替代方案

...如果我使用 doc.SaveAs()，该文件似乎会保留 "in use"，直到我的网络应用程序退出。

问：有什么建议吗？

Answer 1

请看这个postHow 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

OpenXML SpreadsheetDocument SaveAs() 给出正在使用的文件错误

OpenXML SpreadsheetDocument SaveAs() giving file-in-use error

c#

excel

openxml

openxml-powertools