XslCompiledTransform.Load引发未设置为对象实例的对象引用 [英] XslCompiledTransform.Load raises Object reference not set to an instance of an object
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问题描述
在XslCompiledTransform中加载xslt时，我得到对象引用未设置为对象的实例。
While loading xslt in XslCompiledTransform, I am getting Object reference not set to an instance of an object.
我从数据库中获取了以下xslt： -
I fetched following xslt from database: -
<xsl:stylesheet version=\"1.0\" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">
<xsl:template match=\"/\">
<html>
<body>
<h2>My CD Collection</h2>
<table border=\"1\">
<tr bgcolor=\"#9acd32\">
<th style=\"text-align:left\">Title</th>
<th style=\"text-align:left\">Artist</th>
</tr>
<xsl:for-each select=\"catalog/cd\">
<tr>
<td>
<xsl:value-of select=\"title\"/>
</td>
<td>
<xsl:value-of select=\"artist\"/>
</td>
</tr>
</xsl:for-each>
</table>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
和以下xml从数据库： -
and following xml from database :-
<?xml version="1.0" encoding="UTF-8"?>
<catalog>
<cd>
<title>Empire Burlesque</title>
<artist>Bob Dylan</artist>
<country>USA</country>
<company>Columbia</company>
<price>10.90</price>
<year>1985</year>
</cd>
</catalog>
使用以下代码转换xslt时： -
When using following code to transform xslt : -
public static string XsltTransform(string xmlContent, string xsltContent)
{
string result = string.Empty;
XmlTextReader xtr = new XmlTextReader(new StringReader(xsltContent));
xsltCompiled.Load(xtr);
using (StringReader srXml = new StringReader(xmlContent))
{
using (XmlReader xrXml = XmlReader.Create(srXml))
{
using (StringWriter sw = new StringWriter())
{
xsltCompiled.Transform(xrXml, null, sw);
result = sw.ToString();
}
}
}
return result;
}
但它引发错误 -
But it throws error "Object reference not set to an instance of an object" at line :-
xsltCompiled.Load(xtr);
有任何建议吗？
更新：
添加更多我在创建XmlTextReader之后得到这个： -
Updates: Just to add more I am getting this after create XmlTextReader : -
推荐答案
您必须删除转义字符。
检查：从字符串中删除转义序列'\'以将其转换为XmlDocument
XsltTransform(xmlContent, xsltContent.Replace("\\\"", "\""));
编辑：（xml，xslt从文件读取）
edited: (xml, xslt read from files)
static void Main(string[] args)
{
string xmlContent = File.ReadAllText("D:/test/data.xml");
string xsltContent = File.ReadAllText("D:/test/style.xslt");
string result = XsltTransform(xmlContent, xsltContent.Replace("\\\"", "\""));
}
static readonly XslCompiledTransform XsltCompiled = new XslCompiledTransform();
public static string XsltTransform(string xmlContent, string xsltContent)
{
string result = string.Empty;
XmlTextReader xtr = new XmlTextReader(new StringReader(xsltContent));
XsltCompiled.Load(xtr);
using (StringReader srXml = new StringReader(xmlContent))
{
using (XmlReader xrXml = XmlReader.Create(srXml))
{
using (StringWriter sw = new StringWriter())
{
XsltCompiled.Transform(xrXml, null, sw);
result = sw.ToString();
}
}
}
return result;
}
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