假设我有两个字符串:
如果您必须知道,xml和xsl数据存储在数据库列中。
如何在C#中转换XML w / o首先将xml和xsl保存为文件?我希望输出也是一个字符串(转换中的HTML)。
似乎C#更喜欢通过文件进行转换。我在XslCompiledTransform中找不到Load()的字符串输入重载。所以,这就是我要问的原因。
答案 0 :(得分:37)
这就是我的用途。这是你的答案的组合。我投了这些灵感的答案:
string output = String.Empty;
using (StringReader srt = new StringReader(xslInput)) // xslInput is a string that contains xsl
using (StringReader sri = new StringReader(xmlInput)) // xmlInput is a string that contains xml
{
using (XmlReader xrt = XmlReader.Create(srt))
using (XmlReader xri = XmlReader.Create(sri))
{
XslCompiledTransform xslt = new XslCompiledTransform();
xslt.Load(xrt);
using (StringWriter sw = new StringWriter())
using (XmlWriter xwo = XmlWriter.Create(sw, xslt.OutputSettings)) // use OutputSettings of xsl, so it can be output as HTML
{
xslt.Transform(xri, xwo);
output = sw.ToString();
}
}
}
注意:xsl中需要此语句,以便以HTML格式输出:
<xsl:output method="html" omit-xml-declaration="yes" />
答案 1 :(得分:5)
如果您使用正确的习语,我花了很长时间(几年)才能弄清楚使用Stream
和/或TextWriter
的简洁代码。
假设transform
和input
是字符串:
StringWriter sw = new StringWriter();
using (XmlReader xrt = XmlReader.Create(new StringReader(transform))
using (XmlReader xri = XmlReader.Create(new StringReader(input))
using (XmlWriter xwo = XmlWriter.Create(sw))
{
XslCompiledTransform xslt = new XslCompiledTransform();
xslt.Load(xrt);
xslt.Transform(xri, xwo);
}
string output = sw.ToString();
答案 2 :(得分:4)
您可以XmlReader.Create() from a StringReader或MemoryStream。 XslCompileTransfrom可以Load() from an XmlReader。
答案 3 :(得分:1)
编辑:添加了使用块
// input-xml
string xmlinput = String.Empty;
// xslt
string xsltinput = String.Empty;
// output-xml
string xmloutput = String.Empty;
// Prepare input-xml
XPathDocument doc = new XPathDocument(new StringReader(xmlinput));
// Prepare XSLT
XslTransform xslt = new XslTransform();
// Creates a XmlReader from your xsl string
using (XmlReader xmlreader = XmlReader.Create(new StringReader(xsltinput)))
{
//Load the stylesheet.
xslt.Load(xmlreader);
// transform
using (StringWriter sw = new StringWriter())
{
xslt.Transform(doc, null, sw);
// save to string
xmloutput = sw.ToString();
}
}
答案 4 :(得分:1)
我发送xml内容然后加载XSLT文档,应用转换然后返回新的xml。
public static string Transform(string xmlString)
{
string output = String.Empty;
try
{
// Load an XML string into the XPathDocument.
StringReader rdr = new StringReader(xmlString);
XPathDocument myXPathDoc = new XPathDocument(rdr);
var myXslTrans = new XslTransform();
//load the Xsl
myXslTrans.Load("XSLTFile.xslt");
//create the output stream
StringWriter sw = new StringWriter();
XmlWriter xwo = XmlWriter.Create(sw);
//do the actual transform of Xml
myXslTrans.Transform(myXPathDoc, null, xwo);
output = sw.ToString();
xwo.Close();
return output;
}
catch (Exception e)
{
Console.WriteLine("Exception: {0}", e.ToString());
throw;
}
}
注意:“XSLTFile.xslt”它被添加到解决方案中并将属性“Copy to Output Directory”设置为“Always always”。
答案 5 :(得分:0)
受Robert Rossney的回答启发的VB.Net版本:
Private Function TransformXML(XMLPath As String, XSLPath As String) As String
Dim XSLT As XslCompiledTransform = New XslCompiledTransform()
Dim sWriter As StringWriter = New StringWriter
Dim xReader As XmlReader = XmlReader.Create(XMLPath)
Using xWriter As XmlWriter = XmlWriter.Create(sWriter)
XSLT.Load(XSLPath)
XSLT.Transform(xReader, xWriter)
End Using
Return sWriter.ToString
End Function
答案 6 :(得分:-1)
我会使用XmlReader.Create(DatabaseBlobStream)
和XmlWriter.Create(StringBuilder)
重载。使用以下DatabaseBlobStream对象
internal class DatabaseBlobStream : Stream
{
private readonly IDataReader reader;
private readonly int columnIndex;
private long streamPosition;
internal DatabaseBlobStream(IDataReader reader, int columnIndex)
{
this.reader = reader;
this.columnIndex = columnIndex;
}
public override bool CanRead
{
get
{
return reader.GetFieldType(columnIndex) == typeof (byte[])
&& !reader.IsDBNull(columnIndex);
}
}
public override bool CanSeek
{
get { return false; }
}
public override bool CanWrite
{
get { return false; }
}
public override void Flush()
{
throw new Exception("This stream does not support writing.");
}
public override long Length
{
get { throw new Exception("This stream does not support the Length property."); }
}
public override long Position
{
get
{
return streamPosition;
}
set
{
streamPosition = value;
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (reader.IsDBNull(columnIndex))
return 0;
int bytesRead = (int)reader.GetBytes(columnIndex, streamPosition + offset, buffer, 0, count);
streamPosition += bytesRead;
return bytesRead;
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new Exception("This stream does not support seeking.");
}
public override void SetLength(long value)
{
throw new Exception("This stream does not support setting the Length.");
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new Exception("This stream does not support writing.");
}
public override void Close()
{
try
{
reader.Close();
}
finally
{
base.Close();
}
}
protected override void Dispose(bool disposing)
{
try
{
reader.Dispose();
}
finally
{
base.Dispose(disposing);
}
}
}