是否可以通过某种属性使用.Net XmlSerializer将字符串序列化为CDATA?
Answers:
[XmlRoot("root")]
public class Sample1Xml
{
internal Sample1Xml()
{
}
[XmlElement("node")]
public NodeType Node { get; set; }
#region Nested type: NodeType
public class NodeType
{
[XmlAttribute("attr1")]
public string Attr1 { get; set; }
[XmlAttribute("attr2")]
public string Attr2 { get; set; }
[XmlIgnore]
public string Content { get; set; }
[XmlText]
public XmlNode[] CDataContent
{
get
{
var dummy = new XmlDocument();
return new XmlNode[] {dummy.CreateCDataSection(Content)};
}
set
{
if (value == null)
{
Content = null;
return;
}
if (value.Length != 1)
{
throw new InvalidOperationException(
String.Format(
"Invalid array length {0}", value.Length));
}
Content = value[0].Value;
}
}
}
#endregion
}
[Serializable]
public class MyClass
{
public MyClass() { }
[XmlIgnore]
public string MyString { get; set; }
[XmlElement("MyString")]
public System.Xml.XmlCDataSection MyStringCDATA
{
get
{
return new System.Xml.XmlDocument().CreateCDataSection(MyString);
}
set
{
MyString = value.Value;
}
}
}
用法:
MyClass mc = new MyClass();
mc.MyString = "<test>Hello World</test>";
XmlSerializer serializer = new XmlSerializer(typeof(MyClass));
StringWriter writer = new StringWriter();
serializer.Serialize(writer, mc);
Console.WriteLine(writer.ToString());
输出:
<?xml version="1.0" encoding="utf-16"?>
<MyClass xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<MyString><![CDATA[<test>Hello World</test>]]></MyString>
</MyClass>
XmlDocument().CreateCDataSection(MyString ?? String.Empty);
除了John Saunders发布的方法之外,您还可以直接使用XmlCDataSection作为类型,尽管它归结为几乎相同的东西:
private string _message;
[XmlElement("CDataElement")]
public XmlCDataSection Message
{
get
{
XmlDocument doc = new XmlDocument();
return doc.CreateCDataSection( _message);
}
set
{
_message = value.Value;
}
}
在要序列化的类中:
public CData Content { get; set; }
和CData类:
public class CData : IXmlSerializable
{
private string _value;
/// <summary>
/// Allow direct assignment from string:
/// CData cdata = "abc";
/// </summary>
/// <param name="value">The string being cast to CData.</param>
/// <returns>A CData object</returns>
public static implicit operator CData(string value)
{
return new CData(value);
}
/// <summary>
/// Allow direct assignment to string:
/// string str = cdata;
/// </summary>
/// <param name="cdata">The CData being cast to a string</param>
/// <returns>A string representation of the CData object</returns>
public static implicit operator string(CData cdata)
{
return cdata._value;
}
public CData() : this(string.Empty)
{
}
public CData(string value)
{
_value = value;
}
public override string ToString()
{
return _value;
}
public System.Xml.Schema.XmlSchema GetSchema()
{
return null;
}
public void ReadXml(System.Xml.XmlReader reader)
{
_value = reader.ReadElementString();
}
public void WriteXml(System.Xml.XmlWriter writer)
{
writer.WriteCData(_value);
}
}
就我而言,我使用的是混合字段,有些不是CDATA,至少对我来说,以下解决方案有效。
通过始终读取“值”字段,无论是CDATA还是纯文本,我都可以获取内容。
[XmlElement("")]
public XmlCDataSection CDataValue {
get {
return new XmlDocument().CreateCDataSection(this.Value);
}
set {
this.Value = value.Value;
}
}
[XmlText]
public string Value;
迟到总比不到好。
干杯
我有类似的需求,但需要不同的输出格式-我想要包含CDATA的节点上的属性。我从上述解决方案中得到了一些启发,以创建自己的解决方案。也许将来会对某人有所帮助...
public class EmbedScript
{
[XmlAttribute("type")]
public string Type { get; set; }
[XmlText]
public XmlNode[] Script { get; set; }
public EmbedScript(string type, string script)
{
Type = type;
Script = new XmlNode[] { new XmlDocument().CreateCDataSection(script) };
}
public EmbedScript()
{
}
}
在要序列化的父对象中,我具有以下属性:
[XmlArray("embedScripts")]
[XmlArrayItem("embedScript")]
public List<EmbedScript> EmbedScripts { get; set; }
我得到以下输出:
<embedScripts>
<embedScript type="Desktop Iframe">
<![CDATA[<div id="play_game"><iframe height="100%" src="http://www.myurl.com" width="100%"></iframe></div>]]>
</embedScript>
<embedScript type="JavaScript">
<![CDATA[]]>
</embedScript>
</embedScripts>
此实现可以处理您正在编码的字符串中的嵌套CDATA(基于John Saunders的原始答案)。
例如,假设您想将以下文字字符串编码为CDATA:
I am purposefully putting some <![CDATA[ cdata markers right ]]> in here!!
您可能希望结果输出看起来像这样:
<![CDATA[I am purposefully putting some <![CDATA[ cdata markers right ]]]]><![CDATA[> in here!!]]>
以下实现将遍历字符串,将实例拆分...]]>...
为...]]
,>...
并为每个实例创建单独的CDATA部分。
[XmlRoot("root")]
public class Sample1Xml
{
internal Sample1Xml()
{
}
[XmlElement("node")]
public NodeType Node { get; set; }
#region Nested type: NodeType
public class NodeType
{
[XmlAttribute("attr1")]
public string Attr1 { get; set; }
[XmlAttribute("attr2")]
public string Attr2 { get; set; }
[XmlIgnore]
public string Content { get; set; }
[XmlText]
public XmlNode[] CDataContent
{
get
{
XmlDocument dummy = new XmlDocument();
List<XmlNode> xmlNodes = new List<XmlNode>();
int tokenCount = 0;
int prevSplit = 0;
for (int i = 0; i < Content.Length; i++)
{
char c = Content[i];
//If the current character is > and it was preceded by ]] (i.e. the last 3 characters were ]]>)
if (c == '>' && tokenCount >= 2)
{
//Put everything up to this point in a new CData Section
string thisSection = Content.Substring(prevSplit, i - prevSplit);
xmlNodes.Add(dummy.CreateCDataSection(thisSection));
prevSplit = i;
}
if (c == ']')
{
tokenCount++;
}
else
{
tokenCount = 0;
}
}
//Put the final part of the string into a CData section
string finalSection = Content.Substring(prevSplit, Content.Length - prevSplit);
xmlNodes.Add(dummy.CreateCDataSection(finalSection));
return xmlNodes.ToArray();
}
set
{
if (value == null)
{
Content = null;
return;
}
if (value.Length != 1)
{
throw new InvalidOperationException(
String.Format(
"Invalid array length {0}", value.Length));
}
Content = value[0].Value;
}
}
}
CDataContent
如果您只阅读XML ,则不需要。XmlSerializer.Deserialize
会自动将其转换为文本。