我正在尝试使用OpenXML库编写Excel文件。
我尝试了以下操作：
try
{
excel.AddRow(toWrite.JobTitle.StripOutInvalidXmlCharacters(),
toWrite.LegalEntity.StripOutInvalidXmlCharacters(), toWrite.WorkingLocation.StripOutInvalidXmlCharacters(), toWrite.WorkingCountry.StripOutInvalidXmlCharacters(), toWrite.JobDescription.StripOutInvalidXmlCharacters(), toWrite.Qualifications.StripOutInvalidXmlCharacters(), toWrite.StatusOfJob.ToString().StripOutInvalidXmlCharacters(), toWrite.PositionOpenDate.StripOutInvalidXmlCharacters(), toWrite.InternalOnly.StripOutInvalidXmlCharacters(), toWrite.StatusOfJob.In(JobStatus.CREATED, JobStatus.INTERVIEW, JobStatus.OFFER, JobStatus.SOURCING) ? "Active" : "Inactive", toWrite.Language?.StripOutInvalidXmlCharacters() ?? "", postingStatus.StripOutInvalidXmlCharacters());
}
catch (ArgumentException e)
{
Logger.Log($"Exception while writing to Excel file. Details:{Environment.NewLine}{e.ToString()}");
}
这里是AddRow以及类中的相关属性和方法：
public SheetData Data { get; private set; }
public void AddRow(params string[] values)
{
if (disposed)
{
throw new ObjectDisposedException("FastExcelUtility");
}
Row r = new Row();
foreach (string value in values)
{
r.Append(ConstructCell(value));
}
Data.AppendChild(r);
}
private Cell ConstructCell(string value, CellValues type)
{
return new Cell()
{
CellValue = new CellValue(value),
DataType = new EnumValue<CellValues>(type)
};
}
但是，对于某些行，由于字符无效-特别是0x0C，我得到了ArgumentException。这是完整的堆栈跟踪：
Exception terminated the running report at 5/21/2019 7:55:42 PM. Details:
System.AggregateException: One or more errors occurred. ---> System.ArgumentException: '', hexadecimal value 0x0C, is an invalid character.
at System.Xml.XmlUtf8RawTextWriter.InvalidXmlChar(Int32 ch, Byte* pDst, Boolean entitize)
at System.Xml.XmlUtf8RawTextWriter.WriteElementTextBlock(Char* pSrc, Char* pSrcEnd)
at System.Xml.XmlUtf8RawTextWriter.WriteString(String text)
at System.Xml.XmlWellFormedWriter.WriteString(String text)
at DocumentFormat.OpenXml.OpenXmlLeafTextElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.Save(Stream stream)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.SaveToPart(OpenXmlPart openXmlPart)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.Save()
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.TrySavePartContent(OpenXmlPart part)
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.SavePartContents(Boolean save)
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.Dispose(Boolean disposing)
at Reports.General_Classes.FastExcelUtility.Dispose(Boolean disposing)
at Reports.General_Classes.FastExcelUtility.Dispose()
at Reports.Reports.QualificationReport.<GetCSV>d__1.MoveNext()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at Report_Runner.Program.Main(String[] args)
---> (Inner Exception #0) System.ArgumentException: '', hexadecimal value 0x0C, is an invalid character.
at System.Xml.XmlUtf8RawTextWriter.InvalidXmlChar(Int32 ch, Byte* pDst, Boolean entitize)
at System.Xml.XmlUtf8RawTextWriter.WriteElementTextBlock(Char* pSrc, Char* pSrcEnd)
at System.Xml.XmlUtf8RawTextWriter.WriteString(String text)
at System.Xml.XmlWellFormedWriter.WriteString(String text)
at DocumentFormat.OpenXml.OpenXmlLeafTextElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlCompositeElement.WriteContentTo(XmlWriter w)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.WriteTo(XmlWriter xmlWriter)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.Save(Stream stream)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.SaveToPart(OpenXmlPart openXmlPart)
at DocumentFormat.OpenXml.OpenXmlPartRootElement.Save()
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.TrySavePartContent(OpenXmlPart part)
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.SavePartContents(Boolean save)
at DocumentFormat.OpenXml.Packaging.OpenXmlPackage.Dispose(Boolean disposing)
at Reports.General_Classes.FastExcelUtility.Dispose(Boolean disposing)
at Reports.General_Classes.FastExcelUtility.Dispose()
at Reports.Reports.QualificationReport.<GetCSV>d__1.MoveNext()<---
我尝试通过在字符串上使用以下扩展方法来解决此问题：
public static string StripOutInvalidXmlCharacters(this string str)
{
var sb = new StringBuilder();
for (int i = 0; i < str.Length; i++)
{
if (XmlConvert.IsXmlChar(str[i]))
{
sb.Append(str[i]);
}
}
return sb.ToString();
}
但是它不能完全解决问题。
在实施此方法之前，无效字符为0x03；现在是0x0C，文件最终比崩溃前更大。该方法还通过了以下单元测试：
[TestMethod]
public void StripOutInvalidChars()
{
var str = new string(new[] { 'a', 'b', (char)0x03, 'c' });
// Make sure that I didn't screw up setting up the test
Assert.AreNotEqual(str, "abc");
// str is invalid - make sure that it strips out the invalid char
Assert.AreEqual(str.StripOutInvalidXmlCharacters(), "abc");
// Should have no effect whatever on a valid string
str = new string(new[] { 'a', 'b', 'c' });
Assert.AreEqual(str.StripOutInvalidXmlCharacters(), "abc");
}
话虽这么说，但我认为实际上是在消除一些无效字符，但显然并没有消除所有无效字符。
try - catch块也没有帮助。发生此异常时，Excel会说该文件已损坏，无法打开或修复。当程序无例外运行时，我可以很好地打开报告。
愚蠢的解决方案只是手动检查0x0C并将其删除，但我担心这种解决方案的效果如何。特别是，我担心此方法可能缺少其他字符，在这种情况下，我的过程可能仍然不稳定。