我有一個使用WCF REST入門套件的預覽版2構建的服務，但我遇到了在調用中傳遞XML樣式數據的問題。這是我的要求對象：使用CDATA和WCF REST入門套件
[DataContract(Namespace = "")]
public class ServiceRequest
{
[DataMember]
public string ContentText { get; set; }
[DataMember]
public string ApiKey { get; set; }
}
一切正常，直到你把''在那裏。是否有一個將ContentText屬性封裝在CDATA或類似的東西中？
Marc Gravell有一個用於序列化CDATA節的解決方案here。
我已將這裏的代碼複製到子孫後代。
更新：前面的例子中並沒有產生一個有效的模式，在XmlSchemaProviderAttribute和相應的方法會產生「XS：字符串」其運作CDataWrapper的[more...]
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Xml;
using System.Xml.Serialization;
using System.ComponentModel;
[XmlSchemaProvider("GenerateSchema")]
public sealed class CDataWrapper : IXmlSerializable
{
// implicit to/from string
public static implicit operator string(CDataWrapper value)
{
return value == null ? null : value.Value;
}
public static implicit operator CDataWrapper(string value)
{
return value == null ? null : new CDataWrapper { Value = value };
}
public System.Xml.Schema.XmlSchema GetSchema()
{
return null;
}
// return "xs:string" as the type in scheme generation
public static XmlQualifiedName GenerateSchema(XmlSchemaSet xs)
{
return XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.String).QualifiedName;
}
// "" => <Node/>
// "Foo" => <Node><![CDATA[Foo]]></Node>
public void WriteXml(XmlWriter writer)
{
if (!string.IsNullOrEmpty(Value))
{
writer.WriteCData(Value);
}
}
// <Node/> => ""
// <Node></Node> => ""
// <Node>Foo</Node> => "Foo"
// <Node><![CDATA[Foo]]></Node> => "Foo"
public void ReadXml(XmlReader reader)
{
if (reader.IsEmptyElement)
{
Value = "";
}
else
{
reader.Read();
switch (reader.NodeType)
{
case XmlNodeType.EndElement:
Value = ""; // empty after all...
break;
case XmlNodeType.Text:
case XmlNodeType.CDATA:
Value = reader.ReadContentAsString();
break;
default:
throw new InvalidOperationException("Expected text/cdata");
}
}
}
// underlying value
public string Value { get; set; }
public override string ToString()
{
return Value;
}
}
// example usage
[DataContract(Namespace="http://myobjects/")]
public sealed class MyType
{
public string SomeValue { get; set; }
[DataMember(Name = "SomeValue", EmitDefaultValue = false)]
private CDataWrapper SomeValueCData
{
get { return SomeValue; }
set { SomeValue = value; }
}
public string EmptyTest { get; set; }
[DataMember(Name = "EmptyTest", EmitDefaultValue = false)]
private CDataWrapper EmptyTestCData
{
get { return EmptyTest; }
set { EmptyTest = value; }
}
public string NullTest { get; set; }
[DataMember(Name = "NullTest", EmitDefaultValue = false)]
private CDataWrapper NullTestCData
{
get { return NullTest ; }
set { NullTest = value; }
}
}
// test rig
static class Program
{
static void Main()
{
DataContractSerializer dcs = new DataContractSerializer(typeof(MyType));
StringWriter writer = new StringWriter();
using (XmlWriter xw = XmlWriter.Create(writer))
{
MyType foo = new MyType
{
SomeValue = @"&<t\d",
NullTest = null,
EmptyTest = ""
};
ShowObject("Original", foo);
dcs.WriteObject(xw, foo);
xw.Close();
}
string xml = writer.ToString();
ShowObject("Xml", xml);
StringReader reader = new StringReader(xml);
using (XmlReader xr = XmlReader.Create(reader))
{
MyType bar = (MyType) dcs.ReadObject(xr);
ShowObject("Recreated", bar);
}
}
static void ShowObject(string caption, object obj)
{
Console.WriteLine();
Console.WriteLine("** {0} **", caption);
Console.WriteLine();
if (obj == null)
{
Console.WriteLine("(null)");
}
else if (obj is string)
{
Console.WriteLine((string)obj);
}
else
{
foreach (PropertyDescriptor prop in TypeDescriptor.GetProperties(obj))
{
Console.WriteLine("{0}:\t{1}", prop.Name, prop.GetValue(obj) ?? "(null)");
}
}
}
}
VB轉換中接受的答案：
Imports System
Imports System.IO
Imports System.Runtime.Serialization
Imports System.Xml
Imports System.Xml.Schema
Imports System.Xml.Serialization
Imports System.ComponentModel
Public Class CDataWrapper
Implements IXmlSerializable
'underlying value
Public Property Value As String
'Implicit to/from string
Public Shared Widening Operator CType(ByVal value As CDataWrapper) As String
If value Is Nothing Then
Return Nothing
Else
Return value.Value
End If
End Operator
Public Shared Widening Operator CType(value As String) As CDataWrapper
If value Is Nothing Then
Return Nothing
Else
Return New CDataWrapper() With {.Value = value}
End If
End Operator
Public Function GetSchema() As XmlSchema Implements IXmlSerializable.GetSchema
Return Nothing
End Function
' <Node/> => ""
' <Node></Node> => ""
' <Node>Foo</Node> => "Foo"
' <Node><![CDATA[Foo]]></Node> => "Foo"
Public Sub ReadXml(reader As XmlReader) Implements IXmlSerializable.ReadXml
If reader.IsEmptyElement Then
Me.Value = ""
Else
reader.Read()
Select Case reader.NodeType
Case XmlNodeType.EndElement
Me.Value = "" ' empty after all...
Case XmlNodeType.Text, XmlNodeType.CDATA
Me.Value = reader.ReadContentAsString()
Case Else
Throw New InvalidOperationException("Expected text/cdata")
End Select
End If
End Sub
' "" => <Node/>
' "Foo" => <Node><![CDATA[Foo]]></Node>
Public Sub WriteXml(writer As XmlWriter) Implements IXmlSerializable.WriteXml
If Not String.IsNullOrEmpty(Me.Value) Then
writer.WriteCData(Me.Value)
End If
End Sub
Public Overrides Function ToString() As String
Return Me.Value
End Function
End Class
上面的代碼缺少一個事實，即您必須在閱讀完內容後才能瀏覽內容。所以這個類現在不適用於一個集合。
將其更改爲以下內容，您現在可以保存CDataWrapper的集合。
Value = reader.ReadContentAsString();
reader.Read();
儘管這是一個較舊的帖子，這裏是我的2¢。我通過將數據成員定義爲XmlElement來解決此問題。
[DataMember(Name = "MyCData")]
public XmlElement MyCDataField { get; set; }
好東西。謝謝凱文！ – 2011-08-11 19:54:35
上面的代碼停止解析CData後的屬性。 當你期望xml中有多個元素時，這是一個問題。 在ReadXML的else標記末尾添加缺少的reader.Read（）修復了此問題。 – Beejee 2014-11-06 13:03:46