XmlCompiledTransform.Load拋出一個NullReferenceException間歇

Question

我有下面的代碼片段

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); 
} 

它有時拋出NullReferenceExcecption並且有時它工作在同一個XSLT文件。

請問你能告訴上述代碼有什麼問題嗎？任何幫助將不勝感激。

下面是堆棧跟蹤

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

從XslCompiledTransform.Load Method注部分直接複製：

有在調試模式下編譯和XSLT 在Release模式編譯XSLT之間的差異。在某些情況下，編譯爲 調試模式的樣式表在加載過程中不會拋出錯誤，但在變換過程中稍後會失敗 。在發佈模式下編譯的相同樣式表將在加載期間失敗 。這種行爲的一個示例是，將不屬於節點集類型的變量分配給需要 節點集的表達式。