System.InvalidOperationException: Response Content-Length mismatch: too few bytes written (0 of 1628

今天记录下通过微软官方开源技术open-xml-sdk操作excel写入内存流，并将该内存流返回给Web客户端，该方法服务器端不用保存本地Excel文件，没有和磁盘的IO开销，效率更高，也不存在服务器excel文件太多需要删除的情况。废话不多说，直接上代码：

public static IActionResult ExportTest(string fileName){MemoryStream stream = new MemoryStream();//第一步，从输入输出流创建Excel文档包SpreadsheetDocument，这里使用内存流SpreadsheetDocument document = SpreadsheetDocument.Create(stream, DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook);//第二步，添加WorkbookPart,并创建Workbook对象WorkbookPart workbookPart = document.AddWorkbookPart();workbookPart.Workbook = new DocumentFormat.OpenXml.Spreadsheet.Workbook();//第三步，添加WorksheetPart，并创建Worksheet对象WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>();worksheetPart.Worksheet = new DocumentFormat.OpenXml.Spreadsheet.Worksheet(new SheetData());//第四步，给Workbook添加WorksheetsSheets sheets = document.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());//第五步，创建Sheet对象实例，并绑定到给Workbook中，并将此sheet加入SheetsSheet sheet = new Sheet() { Id=document.WorkbookPart.GetIdOfPart(worksheetPart),SheetId=1,Name="mySheet"};sheets.Append(sheet);//第六步，保存workbookworkbookPart.Workbook.Save();//第七步，关闭Excel文档包SpreadsheetDocumentdocument.Close();//必须将流的当前位置置0，否则将引发异常//如果不设置为0，则流的当前位置在流的末端1629，然后读流就会从索引1629开始读取，实际上流的最大索引是1628，就会引发无效操作异常System.InvalidOperationException//System.InvalidOperationException: Response Content-Length mismatch: too few bytes written (0 of 1628)stream.Position = 0;string fileExt = Path.GetExtension(fileName);var provider = new FileExtensionContentTypeProvider();var memi = provider.Mappings[fileExt];FileStreamResult fileStreamResult = new FileStreamResult(stream, memi) { FileDownloadName = fileName };return fileStreamResult;}

需要添加的引用：

using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.StaticFiles;

此过程中比较容易出错的点就是很多人容易忘记“stream.Position = 0;”这行代码，所以我记录下来，供大家参考。

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