我已经实现了一个 csv 文件构建器,它接收一个 xml 文档,对其应用 xsl 转换并将其附加到一个文件中。
public class CsvBatchPrinter : BaseBatchPrinter
{
public CsvBatchPrinter() : base(".csv")
{
RemoveDiatrics = false;
}
protected override void PrintDocuments(System.Collections.Generic.List<XmlDocument> documents, string xsltFileName, string directory, string tempImageDirectory)
{
base.PrintDocuments(documents, xsltFileName, directory, tempImageDirectory);
foreach (var file in new DirectoryInfo(tempImageDirectory).GetFiles())
{
var destination = directory + file.Name;
if (!File.Exists(destination))
file.CopyTo(destination);
}
}
protected override void PrintDocument(XmlDocument document, string xsltFileName, string directory, string tempImageDirectory)
{
StringUtils.EscapeQuotesInXmlNode(document);
if (RemoveDiatrics)
{
var docXml = StringUtils.RemoveDiatrics(document.OuterXml);
document = new XmlDocument();
document.LoadXml(docXml);
}
using (var writer = new StreamWriter(string.Format("{0}{1}{2}", directory, "batch", FileExtension), true, Encoding.ASCII))
{
Transform(document, xsltFileName, writer);
}
}
public bool RemoveDiatrics { get; set; }
}
我有大量的 xml 文档要添加到这个 csv 文件中,在多次调用它之后,它偶尔会抛出一个 IOExceptionThe process cannot access the file 'batch.csv' because it is being used by another process.
这会是某种锁定问题吗?
是否可以通过以下方式解决:
lock(this)
{
using (var writer = new StreamWriter(string.Format("{0}{1}{2}", directory, "batch", FileExtension), true, Encoding.ASCII))
{
Transform(document, xsltFileName, writer);
}
}
编辑:
这是我的堆栈跟踪:
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
at System.IO.StreamWriter.CreateFile(String path, Boolean append)
at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize)
at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding)
at Receipts.Facade.Utilities.BatchPrinters.CsvBatchPrinter.PrintDocument(XmlDocument document, String xsltFileName, String directory, String tempImageDirectory) in CsvBatchPrinter.cs:line 37
at Receipts.Facade.Utilities.BatchPrinters.BaseBatchPrinter.PrintDocuments(List`1 documents, String xsltFileName, String directory, String tempImageDirectory) in BaseBatchPrinter.cs:line 30
at Receipts.Facade.Utilities.BatchPrinters.CsvBatchPrinter.PrintDocuments(List`1 documents, String xsltFileName, String directory, String tempImageDirectory) in CsvBatchPrinter.cs:line 17
at Receipts.Facade.Utilities.BatchPrinters.BaseBatchPrinter.Print(List`1 documents, String xsltFileName, String destinationDirectory, String tempImageDirectory) in BaseBatchPrinter.cs:line 23
at Receipts.Facade.Modules.FinanceDocuments.FinanceDocumentActuator`2.printXmlFiles(List`1 xmlDocuments, String tempImagesDirectory) in FinanceDocumentActuator.cs:line 137
和我的基类:
public abstract class BaseBatchPrinter : IBatchPrinter
{
private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
protected readonly string FileExtension;
protected BaseBatchPrinter(string fileExtension)
{
FileExtension = fileExtension;
}
public void Print(List<XmlDocument> documents, string xsltFileName, string destinationDirectory, string tempImageDirectory)
{
Log.InfoFormat("Printing to directory: {0}", destinationDirectory);
PrintDocuments(documents, xsltFileName, destinationDirectory, tempImageDirectory);
}
protected virtual void PrintDocuments(List<XmlDocument> documents, string xsltFileName, string directory, string tempImageDirectory)
{
foreach (var document in documents)
{
PrintDocument(document, xsltFileName, directory, tempImageDirectory);
}
}
/// <summary>
/// Needs to Call Transform(XmlDocument document, string xsltFileName, string directory)
/// </summary>
protected abstract void PrintDocument(XmlDocument document, string xsltFileName, string directory, string tempImageDirectory);
protected void Transform(XmlDocument document, string xsltFileName, StreamWriter writer)
{
//TODO: look into XslCompiledTransform to replace the XslTransform
var xslTransform = new XslTransform();
xslTransform.Load(xsltFileName);
xslTransform.Transform(createNavigator(document), null, writer);
}
protected string CreateFileName(string directory, XmlDocument doc)
{
var conId = createNavigator(doc).SelectSingleNode(Config.SELECT_CONSTITUENT_ID_XPATH).Value;
return string.Format(@"{0}{1}{2}", directory, conId, FileExtension.IndexOf('.') > -1 ? FileExtension : "." + FileExtension);
}
protected XPathNavigator createNavigator(XmlDocument document)
{
return document.DocumentElement == null ? document.CreateNavigator() : document.DocumentElement.CreateNavigator();
}
}
干杯。