C# 读取大型XLSX文件

我有一个应用程序，必须读取excel并将其转换为数组。到现在为止，一直都还不错。在我尝试转换一个更大的文件之前，所有文件都可以正常工作。我尝试了OpenXML和SAX方法：

using (SpreadsheetDocument xlsx = SpreadsheetDocument.Open(filePath, false))
{
   WorkbookPart workbookPart = xlsx.WorkbookPart;
   List<List<string>> parsedContent = new List<List<string>>();
   foreach (WorksheetPart worksheet in workbookPart.WorksheetParts)
       {
           OpenXmlReader xlsxReader = OpenXmlReader.Create(worksheet);

           while (xlsxReader.Read())
           {
           }
        }
 }

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

使用（SpreadsheetDocument xlsx=SpreadsheetDocument.Open（filePath，false））
{
WorkbookPart WorkbookPart=xlsx.WorkbookPart；
List parsedContent=新列表（）；
foreach（workbookPart.WorksheetParts中的工作表部件工作表）
{
OpenXmlReader xlsxReader=OpenXmlReader.Create（工作表）；
while（xlsxReader.Read（））
{
}
}
}

这对于1-10MB范围内的文件很有效。我的问题是当我尝试加载10+MB文件时。结果是OutOfMemoryException。如何正确读取那大块数据？如何提高内存利用率

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

另外，我尝试使用ClosedXML、EPPlus等库

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

---

每一个解决方案都将受到赞赏。提前感谢

如果您计划只读取excel文件内容，我建议您使用ExcelDataReader库，它将工作表数据提取到数据集对象中

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

使用。通过Nuget很容易安装，只需要几行代码：

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

努吉：

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

Install-Package ExcelDataReader

用法：

        IExcelDataReader reader = null;
        string FilePath = "PathToExcelFile";

        //Load file into a stream
        FileStream stream = File.Open(FilePath, FileMode.Open, FileAccess.Read);

        //Must check file extension to adjust the reader to the excel file type
        if (Path.GetExtension(FilePath).Equals(".xls"))
            reader = ExcelReaderFactory.CreateBinaryReader(stream);
        else if (Path.GetExtension(FilePath).Equals(".xlsx"))
            reader = ExcelReaderFactory.CreateOpenXmlReader(stream);

        if (reader != null)
        {
            //Fill DataSet
            DataSet content = reader.AsDataSet();
            //Read....
        }

 using (FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read))
    {
        using (IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream))
        {
            DataSet result = excelReader.AsDataSet();
            foreach (DataRow dr in result[0])
            {
                //Do stuff
            }
        }
    }

---

可能重复检查此：@VDWWD不是一个好的重复-几乎所有答案都是bad@Vasil为什么要使用1000万个元素的列表？这是导致问题的原因，而不是Excel。当你把所有东西都保存在内存中时，使用阅读器是没有意义的。只有当您立即处理数据时，读卡器才有意义。您是如何处理这些行的，为什么要将它们存储在

列表中？你不应该使用数组吗？一个代码示例将大大提高这个答案的质量，它就像魔术一样。这应该被接受为答案