具有C#扩展功能的XSLT中的错误消息 [英] Error message in XSLT with C# extension function
问题描述
尝试在XSLT中实现C#扩展功能时收到以下错误。
I am received the following error while trying to implement a C# extension function in XSLT.
扩展功能参数或返回值具有不支持CLR类型'Char []'。**
Extension function parameters or return values which have CLR type 'Char[]' are not supported.**
code:
<xsl:variable name="stringList">
<xsl:value-of select="extension:GetList('AAA BBB CCC', ' ')"/>
</xsl:variable>
<msxsl:script language="C#" implements-prefix="extension">
<![CDATA[
public string[] GetList(string str, char[] delimiter)
{
...
...
return str.Split(delimiter, StringSplitOptions.None);
}
]]>
</msxsl:script>
有人可以解释此错误消息以及如何解决吗?
Can someone explain this error message and how to get past it?
编辑:我需要一个仍然可以实现split函数并利用返回的数组的解决方案。
I need a solution that still lets me implement the split function and make use of the array returned.
谢谢!
推荐答案
XSLT扩展方法必须返回XSL转换支持的类型。下表显示了W3C XPath类型及其对应的.NET类型:
XSLT extension methods must return a type that is supported within XSL transformations. The following table shows the W3C XPath types and their corresponging .NET type:
W3C XPath Type | Equivalent .NET Class (Type)
------------------------------------------------------
String | System.String
Boolean | System.Boolean
Number | System.Double
Result Tree Fragment | System.Xml.XPath.XPathNavigator
Node Set | System.Xml.XPath.XPathNodeIterator
该表摘自Xemt和.NET之间的映射类型部分。在此 MSDN杂志文章中。
The table is taken from the section Mapping Types between XSLT and .NET in this MSDN Magazine article.
与其返回 string []
数组,不如返回一个 XPathNodeIterator
,而不是返回它在以下示例中完成:
Instead of returning a string[]
array you would have to return an XPathNodeIterator
like it is done in the following example:
<msxsl:script implements-prefix="extension" language="C#">
<![CDATA[
public XPathNodeIterator GetList(string str, string delimiter)
{
string[] items = str.Split(delimiter.ToCharArray(), StringSplitOptions.None);
XmlDocument doc = new XmlDocument();
doc.AppendChild(doc.CreateElement("root"));
using (XmlWriter writer = doc.DocumentElement.CreateNavigator().AppendChild())
{
foreach (string item in items)
{
writer.WriteElementString("item", item);
}
}
return doc.DocumentElement.CreateNavigator().Select("item");
}
]]>
</msxsl:script>
在XSL转换中,您可以使用<$ c $遍历返回的节点集中的元素c> xsl:for-each :
In your XSL transform you can then iterate over the elements in the returned node set using xsl:for-each
:
<xsl:template match="/">
<root>
<xsl:for-each select="extension:GetList('one,two,three', ',')">
<value>
<xsl:value-of select="."/>
</value>
</xsl:for-each>
</root>
</xsl:template>
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