Question

我正在维护一个旧的.NET 1.1应用程序，该应用程序在对大型数据集进行XSL转换期间内存不足。 XML直接写入FileStream：

Dim xslDoc As New System.Xml.Xsl.XslTransform
Dim sourceStream As New System.IO.MemoryStream
Dim sourceStreamWriter As New System.IO.StreamWriter(sourceStream)
Try
  ' Load data and schema from DataSet
  Dim sourceDoc As New System.Xml.XmlDocument
  dataSet.WriteXml(sourceStreamWriter , XmlWriteMode.WriteSchema)
  sourceStreamWriter.Flush()
  sourceStream.Position = 0
  sourceDoc.Load(sourceStream)

  ' Load XSLT
  xslDoc.Load("c:\path\to\transform.xslt")

  ' Transform (FAILS HERE)
  xslDoc.Transform(sourceDoc, Nothing, fileStream, New System.Xml.XmlUrlResolver)
Finally
  schemaStreamWriter.Close()
  schemaStream.Close()
End Try

我在这个问题上找到了类似的问题，但是他们通常会描述这样一种情况：将结果XML写入MemoryStream而不是FileStream，或者参考使用XslCompiledTransform，遗憾的是，只能从.NET 2.0及更高版本获得。

如何在转换过程中避免耗尽所有内存？

（类似（未回答）问题：http://vbcity.com/forums/t/151286.aspx）

Answer 1

你可以尝试什么，而不是

Dim sourceStream As New System.IO.MemoryStream
Dim sourceStreamWriter As New System.IO.StreamWriter(sourceStream)
Try
  ' Load data and schema from DataSet
  Dim sourceDoc As New System.Xml.XmlDocument
  dataSet.WriteXml(sourceStreamWriter , XmlWriteMode.WriteSchema)
  sourceStreamWriter.Flush()
  sourceStream.Position = 0
  sourceDoc.Load(sourceStream)

  ' Load XSLT
  xslDoc.Load("c:\path\to\transform.xslt")

  ' Transform (FAILS HERE)
  xslDoc.Transform(sourceDoc, Nothing, fileStream, New System.Xml.XmlUrlResolver)

使用

Dim dataDoc as XmlDataDocument = new XmlDataDocument(dataSet)
  ' Load XSLT
  xslDoc.Load("c:\path\to\transform.xslt")

  ' Transform (FAILS HERE)
  xslDoc.Transform(dataDoc, Nothing, fileStream, New System.Xml.XmlUrlResolver)

Answer 2

我们发现无法从.NET中解决这个问题。我们可能会在将来尝试优化XSLT。

（目前，客户已同意将数据分成批次，从而产生多个文件）

.NET 1.1中的XSL转换期间的OutOfMemoryException

2 个答案: