Question

这是我的代码：

static void Main(string[] args)
{
    string xml = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/data.xml");
    string xslt = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/dataXslt.xsl");
    string xmlCopy = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/data.xml");

    TransformData(xml, xmlCopy, xslt);
}

static public void TransformData(string data, string xmlCopy, string xslt)
{
    // Create a Processor instance.
    Processor processor = new Processor();

    // Create a compiled stylesheet
    processor.NewXsltCompiler().BaseUri = new Uri("C:/Users/Davíð/source/Saxon/Saxon");
    XsltExecutable templates = processor.NewXsltCompiler().Compile(new XmlTextReader(new StringReader(xslt)));

    // Note: we could actually use the same Xslt30Transformer in this case.
    // But in principle, the two transformations could be done in parallel in separate threads.

    // Do the first transformation
    Console.WriteLine("\n\n----- transform of " + data + " -----");
    Xslt30Transformer transformer1 = templates.Load30();
    XdmNode input1 = processor.NewDocumentBuilder().Build(new XmlTextReader(new StringReader(data)));
    transformer1.ApplyTemplates(input1, processor.NewSerializer(Console.Out));     // default destination is Console.Out

    // Do the second transformation
    Console.WriteLine("\n\n----- transform of " + xmlCopy + " -----");
    Xslt30Transformer transformer2 = templates.Load30();
    XdmNode input2 = processor.NewDocumentBuilder().Build(new XmlTextReader(new StringReader(xmlCopy)));
    transformer2.ApplyTemplates(input2, processor.NewSerializer(Console.Out));     // default destination is Console.Out
}

无论我是否删除BaseUri，这都是我不断得到的错误。

未处理的异常：System.ArgumentNullException：值不能为null。参数名称：BaseUri 在Saxon.Api.XsltCompiler.Compile（XmlReader reader）在Saxon.Program.TransformData（String data，String xmlCopy，String xslt）在C：\ Users \Davíð\ source \ Saxon \ Saxon \ Program.cs：line 33中在C：\ Users \Davíð\ source \ Saxon \ Saxon \ Program.cs：line 22中的Saxon.Program.Main（String [] args）处

基于下面的注释，固定的工作代码：

static void Main(string[] args)

{
    string xml = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/data.xml");
    string xslt = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/dataXslt.xsl");

    TransformData(xml, xml, xslt);
}

static public void TransformData(string data, string xmlCopy, string xslt)
{
    // Create a Processor instance.
    Processor processor = new Processor();

    // Create a compiled stylesheet
    var compiler = processor.NewXsltCompiler();
    compiler.BaseUri = new Uri("C:/Users/Davíð/source/Saxon/Saxon");
    XsltExecutable templates = compiler.Compile(XmlReader.Create(new StringReader(xslt)));

    // Note: we could actually use the same Xslt30Transformer in this case.
    // But in principle, the two transformations could be done in parallel in separate threads.

    // Do the first transformation
    Console.WriteLine("\n\n----- transform of " + data + " -----");
    Xslt30Transformer transformer1 = templates.Load30();
    XdmNode input1 = processor.NewDocumentBuilder().Build(XmlReader.Create(new StringReader(data)));
    transformer1.ApplyTemplates(input1, processor.NewSerializer(Console.Out));     // default destination is Console.Out

    // Do the second transformation
    Console.WriteLine("\n\n----- transform of " + xmlCopy + " -----");
    Xslt30Transformer transformer2 = templates.Load30();
    XdmNode input2 = processor.NewDocumentBuilder().Build(new XmlTextReader(new StringReader(xmlCopy)));
    transformer2.ApplyTemplates(input2, processor.NewSerializer(Console.Out));     // default destination is Console.Out
}

Answer 1

您遇到了一些问题：

processor.NewXsltCompiler()都会返回一个新的XsltCompiler。您称它为两次：
```
processor.NewXsltCompiler().BaseUri = new Uri("C:/Users/Davíð/source/Saxon/Saxon");
XsltExecutable templates = processor.NewXsltCompiler().Compile(new XmlTextReader(new StringReader(xslt)));
```
代码首先设置BaseUri，然后创建另一个代码进行编译。因此，永远不会在实际用于工作的BaseUri上设置XsltCompiler。

这是导致异常的直接原因。未处理的异常：System.ArgumentNullException：值不能为null。参数名称：Saxon.Api.XsltCompiler.Compile（XmlReader reader）处的BaseUri 。

您应该只创建一个XsltCompiler。
您正在使用XmlTextReader，但是XmlTextReader has been deprecated since .Net 2.0已有10多年的历史了。而是使用XmlReader.Create(TextReader)。另外，请确保事后将其丢弃。
您将文件data.xml的内容的两个副本加载到内存xml和xmlCopy中。但是.Net中的字符串是不可变的，因此不需要这样做。

因此您的代码应类似于：

public static void Main(string[] args)
{
    string xml = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/data.xml");
    string xslt = File.ReadAllText("C:/Users/Davíð/source/Saxon/Saxon/dataXslt.xsl");

    TransformData(xml, xml, xslt);
}

static public void TransformData(string xml1, string xml2, string xslt)
{
    // Create a Processor instance.
    var processor = new Processor();

    // Create a compiled stylesheet
    var compiler = processor.NewXsltCompiler();
    compiler.BaseUri = new Uri("C:/Users/Davíð/source/Saxon/Saxon");
    XsltExecutable templates;
    using (var reader = XmlReader.Create(new StringReader(xslt)))
        templates = compiler.Compile(reader);

    // Note: we could actually use the same Xslt30Transformer in this case.
    // But in principle, the two transformations could be done in parallel in separate threads.

    // Do the first transformation
    Console.WriteLine("\n\n----- transform of " + xml1 + " -----");
    TransformData(processor, templates, xml1, Console.Out);

    // Do the second transformation
    Console.WriteLine("\n\n----- transform of " + xml2 + " -----");
    TransformData(processor, templates, xml2, Console.Out);
}

private static void TransformData(Processor processor, XsltExecutable templates, string xml, TextWriter output)
{
    var transformer = templates.Load30();
    using (var reader = XmlReader.Create(new StringReader(xml)))
    {
        var input = processor.NewDocumentBuilder().Build(reader);
        transformer.ApplyTemplates(input, processor.NewSerializer(output));
    }
}

撒克逊语中的BaseUri尝试编译xslt内容时导致问题

1 个答案: