c# - 保存xml文件时防止文件损坏

Question

当抛出 OutOfMemoryException 时，下一行有时会破坏 xml 文件并创建一个零长度的 xml。如何防止文件损坏？

xmlDoc.Save(filename)

Save-Exception of type 'System.OutOfMemoryException' was thrown. Save-at System.IO.FileStream.Write(Byte[] array, Int32 offset, Int32 count) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.IO.StreamWriter.Write(Char value) at System.Xml.XmlTextWriter.Indent(Boolean beforeEndElement) at System.Xml.XmlTextWriter.AutoComplete(Token token) at System.Xml.XmlTextWriter.WriteStartElement(String prefix, String localName, String ns) at System.Xml.XmlDOMTextWriter.WriteStartElement(String prefix, String localName, String ns) at System.Xml.XmlElement.WriteTo(XmlWriter w) at System.Xml.XmlElement.WriteContentTo(XmlWriter w) at System.Xml.XmlElement.WriteTo(XmlWriter w) at System.Xml.XmlDocument.WriteContentTo(XmlWriter xw) at System.Xml.XmlDocument.WriteTo(XmlWriter w) at System.Xml.XmlDocument.Save(String filename) at MainOptions.Save(String filename, ItemOptions options)

Answer 1

当您将文件保存到 filename 时，您正在覆盖该文件。要备份旧副本，

• 在保存之前将其移动到另一个位置(如 filename.bak)并之后删除它或
• 将新文件另存为另一个文件(如filename.new)并成功重命名

当抛出异常时，您可以轻松恢复旧/以前版本的 xml 文件。