如何解决XSL包括从字符串加载XSL转型？ [英] How to resolve XSL includes in a Transformation that loads XSL from a String?
问题描述
.NET 2.0 / VS2005
我试图使用 XslCompiledTransform 类执行XSL转换。我有两个XSL文件，其中第一个包含的形式向其他的参考< XSL：包括> 语句：
Main.xsl：
<的xsl：样式版本= 1.0的xmlns：XSL =http://www.w3.org/1999/XSL/Transform>
< XSL：包括HREF =Included.xsl/>
...
：
< / XSL：样式>
现在，如果我能加载Main.xsl文件本身作为一个URI，我的转换代码就这么简单：
//这是一个可行的功能。为了演示而已。
私人字符串变换（串xslFileURI）
{
XslCompiledTransform XSLT =新XslCompiledTransform（）;
//此负载工作得很好，如果我提供的路径，Main.xsl。
//在xsl：包括自动解决。
xslTransform.Load（xslFileURI）;
StringWriter的SW =新的StringWriter（）;
xslt.Transform（使用Server.Mappath（〜/ XML / input.xml中），空，SW）;
返回sw.ToString（）;
}
的问题是，我收到了Main.xsl文件的内容作为串并需要加载字符串作为的XmlReader / IXpathNavigable 。 的这是在这个时候必要的限制。的当我尝试使用做同样的的XmlReader / XPathDocument中，它失败，因为代码的查找Included.xslC：\Program Files\Microsoft的Visual Studio 8\Common7\IDE\ 文件夹！显然，的XmlResolver 不能，因为它只接收一个字符串作为输入XSL来解决相对URL。
我朝这个方向努力的样子：
//这不工作！ HALP！
私人字符串变换（串xslContents）
{
XslCompiledTransform XSLT =新XslCompiledTransform（）;
XmlUrlResolver解析器=新XmlUrlResolver（）;
resolver.Credentials = CredentialCache.DefaultCredentials;
//方法1：这种方法是行不通的。
XmlReaderSettings设置=新XmlReaderSettings（）;
settings.XmlResolver =解析;
的XmlReader xR的= XmlReader.Create（新StringReader（xslContents），设置）;
xslt.Load（xR的）; //失败
//方法2：不工作的。
XPathDocument的xpDoc =新的XPathDocument（新StringReader（xslContents））;
xslt.Load（xpDoc，新XsltSettings（真实的，真实的），旋转变压器）; //失败。
StringWriter的SW =新的StringWriter（）;
xslt.Transform（使用Server.Mappath（〜/ XML / input.xml中），空，SW）;
返回sw.ToString（）;
}
我曾尝试使用 ResolveUri 的XmlUrlResolver的方法来获取流引用将包含在XSL文件，但很困惑，如何使用此流。
<$ P：IOW，我怎么告诉
XslCompiledTransform 对象除了Main.xsl的XmlReader使用此流$ p> 乌里mainURI =新的URI（Request.PhysicalApplicationPath +Main.xsl）;
乌里URI = resolver.ResolveUri（mainURIIncluded.xsl）;
//我可以确认，在以下流的Included.xsl文件加载。
流S = resolver.GetEntity（URI，空的typeof（流））作为流;
//我如何使用此流在上面的功能？
任何帮助是极大的赞赏。 ！对不起，长的帖子
有关参考，异常堆栈跟踪看起来是这样的：
[FileNotFoundException异常：找不到文件'C：\Program Files\Microsoft Visual Studio的8\Common7\IDE\Included.xsl']
System.IO .__错误。 WinIOError（的Int32的errorCode，字符串maybeFullPath）328
System.IO.FileStream.Init（字符串路径，模式的FileMode，FileAccess的访问，的Int32权利，布尔useRights，文件共享份额，缓冲区大小的Int32，FileOptions选项，SECURITY_ATTRIBUTES secAttrs，字符串MSGPATH，布尔bFromProxy）1038
System.IO.FileStream..ctor（字符串路径，模式的FileMode，FileAccess的访问，文件共享份额的Int32缓冲区大小）+113
System.Xml.XmlDownloadManager.GetStream（URI URI，ICredentials凭证）+78
System.Xml.XmlUrlResolver.GetEntity（URI绝对URI，字符串的作用，类型ofObjectToReturn）+51
System.Xml.Xsl.Xslt.XsltLoader.CreateReader（URI URI，的XmlResolver的XmlResolver）+22
System.Xml.Xsl.Xslt.XsltLoader.LoadStylesheet（URI URI，布尔包括）+33
System.Xml.Xsl.Xslt.XsltLoader.LoadInclude（）349
System.Xml.Xsl.Xslt.XsltLoader.LoadRealStylesheet（）704
System.Xml.Xsl.Xslt.XsltLoader.LoadDocument（）293
System.Xml.Xsl.Xslt.XsltLoader.LoadStylesheet （读者的XmlReader，布尔包括）+173
嘿地狱犬，
使用自定义XmlUrlResolver
类MyXmlUrlResolver：XmlUrlResolver
{
公众覆盖乌里ResolveUri （URI基本URI，串relativeUri）
{
如果（！基本URI = NULL）
返回base.ResolveUri（基本URI，relativeUri）;
，否则
返回base.ResolveUri（新的URI（HTTP：// mypath中/），relativeUri）;
}
}
和在XslCompiledTransform的装载功能使用它，
解析器=新MyXmlUrlResolver（）;
xslt.Load（xR的，空，旋转变压器）;
.NET 2.0/VS2005
I am trying to use the XslCompiledTransform class to perform a XSL Transformation. I have two XSL files, the first of which includes a reference to the other in the form of an <xsl:include> statement :
Main.xsl:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:include href="Included.xsl" />
...
...
</xsl:stylesheet>
Now, If I could load the "Main.xsl" file itself as a URI, my transformation code would be as simple as :
// This is a function that works. For demo only.
private string Transform(string xslFileURI)
{
XslCompiledTransform xslt = new XslCompiledTransform();
// This load works just fine, if I provide the path to "Main.xsl".
// The xsl:include is automatically resolved.
xslTransform.Load(xslFileURI);
StringWriter sw = new StringWriter();
xslt.Transform(Server.MapPath("~/XML/input.xml"), null, sw);
return sw.ToString();
}
The problem is that I receive the contents of the Main.xsl file as a string and need to load the string as an XmlReader/IXpathNavigable. This is a necessary restriction at this time. When I try to do the same using an XmlReader/XpathDocument, it fails because the code looks for "Included.xsl" in the C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\ folder! Obviously, the XmlResolver is not able to resolve the relative URL because it only receives a string as input XSL.
My efforts in this direction look like:
// This doesn't work! Halp!
private string Transform(string xslContents)
{
XslCompiledTransform xslt = new XslCompiledTransform();
XmlUrlResolver resolver = new XmlUrlResolver();
resolver.Credentials = CredentialCache.DefaultCredentials;
//METHOD 1: This method does not work.
XmlReaderSettings settings = new XmlReaderSettings();
settings.XmlResolver = resolver;
XmlReader xR = XmlReader.Create(new StringReader(xslContents), settings);
xslt.Load(xR); // fails
// METHOD 2: Does not work either.
XPathDocument xpDoc = new XPathDocument(new StringReader(xslContents));
xslt.Load(xpDoc, new XsltSettings(true, true), resolver); //fails.
StringWriter sw = new StringWriter();
xslt.Transform(Server.MapPath("~/XML/input.xml"), null, sw);
return sw.ToString();
}
I have tried to use the ResolveUri method of the XmlUrlResolver to obtain a Stream referencing the XSL file to be included, but am confused as to how to use this Stream. IOW, how do I tell the XslCompiledTransform object to use this stream in addition to the Main.xsl XmlReader:
Uri mainURI = new Uri(Request.PhysicalApplicationPath + "Main.xsl");
Uri uri = resolver.ResolveUri(mainURI, "Included.xsl");
// I can verify that the Included.xsl file loads in the Stream below.
Stream s = resolver.GetEntity(uri, null, typeof(Stream)) as Stream;
// How do I use this Stream in the function above??
Any help is greatly appreciated. Sorry for the long post!
For your reference, the Exception StackTrace looks like this:
[FileNotFoundException: Could not find file 'C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\Included.xsl'.]
System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +328
System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) +1038
System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) +113
System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials) +78
System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn) +51
System.Xml.Xsl.Xslt.XsltLoader.CreateReader(Uri uri, XmlResolver xmlResolver) +22
System.Xml.Xsl.Xslt.XsltLoader.LoadStylesheet(Uri uri, Boolean include) +33
System.Xml.Xsl.Xslt.XsltLoader.LoadInclude() +349
System.Xml.Xsl.Xslt.XsltLoader.LoadRealStylesheet() +704
System.Xml.Xsl.Xslt.XsltLoader.LoadDocument() +293
System.Xml.Xsl.Xslt.XsltLoader.LoadStylesheet(XmlReader reader, Boolean include) +173
Hey Cerberus, Use a custom XmlUrlResolver
class MyXmlUrlResolver : XmlUrlResolver
{
public override Uri ResolveUri(Uri baseUri, string relativeUri)
{
if (baseUri != null)
return base.ResolveUri(baseUri, relativeUri);
else
return base.ResolveUri(new Uri("http://mypath/"), relativeUri);
}
}
And use it in load function of XslCompiledTransform,
resolver=new MyXmlUrlResolver();
xslt.Load(xR,null,resolver);
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