Question

我有以下代码段

this.xslCompiledTransform = new XslCompiledTransform();

// initialize xsl transform
using (Stream xsltStream = currentAssembly.GetManifestResourceStream(this.TransformationFile))
using (XmlReader schemaReader = XmlReader.Create(xsltStream))
{
    XsltSettings settings = new XsltSettings() { EnableScript = true };
    this.xslCompiledTransform.Load(schemaReader, settings, null);
}

它会在某个时间抛出NullReferenceExcecption，有时它会在同一个xslt文件上运行。

您能否告诉我上述代码有什么问题？任何帮助将不胜感激。

下面是堆栈跟踪

    Object reference not set to an instance of an object.

Stack Trace:
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitFor(QilIterator ndFor)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisitEnsureStack(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitXPathNodeValue(QilUnary ndVal)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisitEnsureStack(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitXsltInvokeEarlyBound(QilInvokeEarlyBound ndInvoke)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitTextCtor(QilUnary ndText, Boolean disableOutputEscaping)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitLoop(QilLoop ndLoop)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitElementCtor(QilBinary ndElem)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitElementCtor(QilBinary ndElem)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitSequence(QilList ndSeq)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitElementCtor(QilBinary ndElem)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.VisitConditional(QilTernary ndCond)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd, Type itemStorageType, Boolean isCached)
   at System.Xml.Xsl.IlGen.XmlILVisitor.NestedVisit(QilNode nd)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Function(QilFunction ndFunc)
   at System.Xml.Xsl.IlGen.XmlILVisitor.Visit(QilExpression qil, GenerateHelper helper, MethodInfo methRoot)
   at System.Xml.Xsl.XmlILGenerator.Generate(QilExpression query, TypeBuilder typeBldr)
   at System.Xml.Xsl.XslCompiledTransform.LoadInternal(Object stylesheet, XsltSettings settings, XmlResolver stylesheetResolver)

Answer 1

直接从XslCompiledTransform.Load Method注释部分复制：

在调试模式下编译的XSLT与XSLT之间存在差异在发布模式下编译。在某些情况下，编译的样式表调试模式不会在Load期间抛出错误，但稍后会失败在变换期间。在发布模式下编译的相同样式表将加载期间失败。这种行为的一个例子是当一个变量不是将节点集类型分配给表达式中的a 节点集是必需的。

XmlCompiledTransform.Load间歇性地抛出NullReferenceException

1 个答案: