Question

我遇到一个问题，文件生成过程可以按预期工作，但是当我打开excel文件时，它说文件已损坏，需要修复。修复完成后，将打开文件，并且所有数据都在其中。

我收到的错误消息如下：

已删除的记录：/xl/worksheets/sheet1.xml部分中的单元格信息

我的代码如下：

using (var workbookDocument = SpreadsheetDocument.Create(staging, DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook))
{
    var count = query.Count();
    var worksheetNumber = 1;
    var worksheetCapacity = Convert.ToInt32(100000);
    var worksheetCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(count) / worksheetCapacity));
    var workbookPart = workbookDocument.AddWorkbookPart();
    var worksheetInfo = new List<WorksheetData>();
    OpenXmlWriter worksheetWriter;

    while (worksheetNumber <= worksheetCount)
    {
        var worksheetLine = 1;
        var worksheetName = sheet + "_" + Convert.ToString(worksheetNumber);
        var worksheetPart = workbookDocument.WorkbookPart.AddNewPart<WorksheetPart>                        
        var worksheetId = workbookDocument.WorkbookPart.GetIdOfPart(worksheetPart);
        var worksheetKey = Convert.ToUInt32(worksheetNumber);
        var worksheetAttributes = new List<OpenXmlAttribute>();

        worksheetAttributes.Add(new OpenXmlAttribute("r", null, worksheetLine.ToString()));
        worksheetInfo.Add(new WorksheetData() { Id = worksheetId, Key = worksheetKey, Name = worksheetName });
        worksheetWriter = OpenXmlWriter.Create(worksheetPart);
        worksheetWriter.WriteStartElement(new Worksheet());
        worksheetWriter.WriteStartElement(new SheetData());

        worksheetWriter.WriteStartElement(new Row(), worksheetAttributes);
        for (var i = 0; i < headers.Count; i++)
        {
            var worksheetCell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
            var worksheetValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(headers[i]);
            worksheetAttributes.Clear();
            worksheetAttributes.Add(new OpenXmlAttribute("t", null, "str"));
            worksheetAttributes.Add(new OpenXmlAttribute("r", null, GetColumnReference(worksheetLine, i)));
            worksheetWriter.WriteStartElement(worksheetCell, worksheetAttributes);
            worksheetWriter.WriteElement(worksheetValue);
            worksheetWriter.WriteEndElement();
        }
        worksheetWriter.WriteEndElement();
        worksheetLine++;

        var skip = ((worksheetNumber - 1) * worksheetCapacity);
        var results = query.SelectProperties(columns).Skip(skip).Take(worksheetCapacity).ToList();
        for (var j = 0; j < results.Count; j++)
        {
            worksheetAttributes.Clear();
            worksheetAttributes.Add(new OpenXmlAttribute("r", null, worksheetLine.ToString()));
            worksheetWriter.WriteStartElement(new Row());
            for (var k = 0; k < columns.Count(); k++)
            {
                var column = columns[k].Split((".").ToCharArray()).Last();
                var value = results[j].GetType().GetField(column).GetValue(results[j]);
                var type = value?.GetType().Name;
                var text = ExportFormatter.Format(type, value);
                worksheetAttributes.Clear();
                worksheetAttributes.Add(new OpenXmlAttribute("t", null, "str"));
                worksheetAttributes.Add(new OpenXmlAttribute("r", null, GetColumnReference(worksheetLine, j)));
                worksheetWriter.WriteStartElement(new Cell());
                worksheetWriter.WriteElement(new CellValue(text));
                worksheetWriter.WriteEndElement();
            }
            worksheetWriter.WriteEndElement();
            worksheetLine++;
        }

        worksheetWriter.WriteEndElement();
        worksheetWriter.WriteEndElement();
        worksheetWriter.Close();
        worksheetNumber++;
    }

    worksheetWriter = OpenXmlWriter.Create(workbookDocument.WorkbookPart);
    worksheetWriter.WriteStartElement(new Workbook());
    worksheetWriter.WriteStartElement(new Sheets());
    for (var i = 0; i < worksheetInfo.Count; i++)
    {
        worksheetWriter.WriteElement(new Sheet()
        {
            Name = worksheetInfo[i].Name,
            SheetId = worksheetInfo[i].Key,
            Id = worksheetInfo[i].Id
            });
        }
    worksheetWriter.WriteEndElement();
    worksheetWriter.WriteEndElement();
    worksheetWriter.Close();
}

我使用下面的类来跟踪工作表信息：

private class WorksheetData
    {
        public String Id { get; set; }
        public UInt32 Key { get; set; }
        public String Name { get; set; }
    }

谁能确定为什么会这样？也许还有多余的结束标记或丢失的标记？

Answer 1

最后使它起作用，有一些问题。

单元格引用A1 A2 A3等...在代码中不正确。
未正确跟踪行号。
应用于单元格元素的属性不正确，因为在写入之前未清除它们。
CallValue的使用未按预期运行。不知道确切的原因，但是当使用“单元格值”时，它在excel中无法正确打开。只需使用单元格并设置DataType和CellValue属性即可。注意-两者之间的基础xml看起来完全相同，但是只有第二个有效。

最终的代码如下：

public static ExportInfo Export<T>(this IQueryable<T> query, String temp, String path, List<ExportField> fields)
    {
        var worker = new ExportWorker();
        return worker.Export<T>(query, temp, path, fields);
    }

public static class ExportFormatter
{
    public static String Format(String type, Object value)
    {
        if (value == null)
        {
            return "";
        }
        else
        {
            var text = "";
            switch (type)
            {
                case "Decimal":
                    var decimalValue = (Decimal)value;
                    text = decimal.Round(decimalValue, 2, MidpointRounding.AwayFromZero).ToString();
                    break;
                case "DateTimeOffset":
                    var dateTimeOffset = (DateTimeOffset)value;
                    text = dateTimeOffset.ToUniversalTime().ToString("MM/dd/yyyy");
                    break;
                case "DateTime":
                    var dateTime = (DateTime)value;
                    text = dateTime.ToUniversalTime().ToString("MM/dd/yyyy");
                    break;
                default:
                    text = Convert.ToString(value);
                    break;
            }
            return text;
        }

public class ExportWorker
{
    String record;
    String staging;
    String destination;
    Thread thread;
    Timer timer;

    public ExportInfo Export<T>(IQueryable<T> query, String temp, String path, List<ExportField> fields)
    {
        var selections = from a in fields group a by new { a.Field } into g select new { g.Key.Field, Header = g.Max(x => x.Header) };
        var headers = (from a in selections select a.Header).ToList();
        var columns = (from a in selections select a.Field).Distinct().ToList();
        var entity = query.ElementType.ToString();
        var array = entity.Split((".").ToCharArray());
        var sheet = array[array.Length - 1];
        var key = Guid.NewGuid().ToString().Replace("-", "_");
        var name = key + ".xlsx";
        var log = key + ".txt";
        var timeout = 60 * 60000;

        staging = temp + name;
        destination = path + name;
        record = path + log;
        thread = new Thread(
                new ThreadStart(() =>
                {
                    try
                    {
                        using (var workbookDocument = SpreadsheetDocument.Create(staging, DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook))
                        {
                            var count = query.Count();
                            var worksheetNumber = 1;
                            var worksheetCapacity = Convert.ToInt32(100000);
                            var worksheetCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(count) / worksheetCapacity));
                            var workbookPart = workbookDocument.AddWorkbookPart();
                            var worksheetInfo = new List<WorksheetData>();
                            OpenXmlWriter worksheetWriter;

                            while (worksheetNumber <= worksheetCount)
                            {
                                var worksheetLine = 1;
                                var worksheetThrottle = 0;
                                var worksheetName = sheet + "_" + Convert.ToString(worksheetNumber);
                                var worksheetPart = workbookDocument.WorkbookPart.AddNewPart<WorksheetPart>();
                                var worksheetId = workbookDocument.WorkbookPart.GetIdOfPart(worksheetPart);
                                var worksheetKey = Convert.ToUInt32(worksheetNumber);
                                var worksheetAttributes = new List<OpenXmlAttribute>();

                                worksheetAttributes.Add(new OpenXmlAttribute("r", null, worksheetLine.ToString()));
                                worksheetInfo.Add(new WorksheetData() { Id = worksheetId, Key = worksheetKey, Name = worksheetName });
                                worksheetWriter = OpenXmlWriter.Create(worksheetPart);
                                worksheetWriter.WriteStartElement(new Worksheet());
                                worksheetWriter.WriteStartElement(new SheetData());

                                worksheetWriter.WriteStartElement(new Row(), worksheetAttributes);
                                for (var i = 0; i < headers.Count; i++)
                                {
                                    var worksheetCell = new Cell();
                                    worksheetCell.DataType = CellValues.String;
                                    worksheetCell.CellValue = new CellValue(headers[i]);
                                    worksheetWriter.WriteElement(worksheetCell);
                                    worksheetAttributes.Clear();
                                }
                                worksheetWriter.WriteEndElement();
                                worksheetLine++;

                                var skip = ((worksheetNumber - 1) * worksheetCapacity);
                                var results = query.SelectProperties(columns).Skip(skip).Take(worksheetCapacity).ToList();
                                for (var j = 0; j < results.Count; j++)
                                {
                                    if (worksheetThrottle >= 5) { worksheetThrottle = 0; System.Threading.Thread.Sleep(1); }
                                    worksheetAttributes.Clear();
                                    worksheetAttributes.Add(new OpenXmlAttribute("r", null, worksheetLine.ToString()));
                                    worksheetWriter.WriteStartElement(new Row(), worksheetAttributes);
                                    for (var k = 0; k < columns.Count(); k++)
                                    {
                                        var column = columns[k].Split((".").ToCharArray()).Last();
                                        var value = results[j].GetType().GetField(column).GetValue(results[j]);
                                        var type = value?.GetType().Name;
                                        var text = (String)ExportFormatter.Format(type, value);
                                        var worksheetCell = new Cell();
                                        worksheetCell.DataType = CellValues.String;
                                        worksheetCell.CellValue = new CellValue(text);
                                        worksheetWriter.WriteElement(worksheetCell);
                                        worksheetAttributes.Clear();
                                    }
                                    worksheetWriter.WriteEndElement();
                                    worksheetLine++;
                                    worksheetThrottle++;
                                }

                                worksheetWriter.WriteEndElement();
                                worksheetWriter.WriteEndElement();
                                worksheetWriter.Close();
                                worksheetNumber++;
                            }

                            worksheetWriter = OpenXmlWriter.Create(workbookDocument.WorkbookPart);
                            worksheetWriter.WriteStartElement(new Workbook());
                            worksheetWriter.WriteStartElement(new Sheets());
                            for (var i = 0; i < worksheetInfo.Count; i++)
                            {
                                worksheetWriter.WriteElement(new Sheet()
                                {
                                    Name = worksheetInfo[i].Name,
                                    SheetId = worksheetInfo[i].Key,
                                    Id = worksheetInfo[i].Id
                                });
                            }
                            worksheetWriter.WriteEndElement();
                            worksheetWriter.WriteEndElement();
                            worksheetWriter.Close();
                        }

                        var logsfile = File.CreateText(record);
                        var datafile = (new DirectoryInfo(temp)).GetFiles().FirstOrDefault(a => a.Name == name);
                        datafile.MoveTo(destination);
                        logsfile.WriteLine("succeeded");
                        logsfile.Close();
                    }
                    catch (Exception ex)
                    {
                        try { File.Delete(staging); } catch (Exception) { }
                        var logsfile = File.CreateText(record);
                        logsfile.WriteLine("failed");
                        logsfile.WriteLine(ex.ToString());
                        logsfile.Close();
                    }
                })
            );
        thread.Start();
        timer = new Timer(Expire, null, timeout, Timeout.Infinite);
        return new ExportInfo() { File = destination, Log = record };
    }

    void Expire(object state)
    {
        try { File.Delete(staging); } catch (Exception) { }
        var logsfile = File.CreateText(record);
        logsfile.WriteLine("timeout");
        logsfile.Close();
        thread.Abort();
    }

    private class WorksheetData
    {
        public String Id { get; set; }
        public UInt32 Key { get; set; }
        public String Name { get; set; }
    }
}

进行这些调整后，导出效果很好。另外，open xml解决了我在内存管理方面遇到的许多问题。使用上述方法，我可以在大约10分钟的时间内导出3个文件，每个文件包含150万行（40列）。在导出过程中，CPU利用率从未超过35％，并且从未使用过超过1/10的内存。太棒了...

打开Xml-需要修复文件才能打开

1 个答案: