Can I use an XmlWriter to write to both a file and a string?
When writing to a file I do this:
using (var xw = XmlWriter.Create("myFile.xml"))
{
//Build the xml
}
And when writing to a string I do this:
using (var sw = new StringWriter())
{
using (var xw = XmlWriter.Create(sw))
{
// Build the xml
}
return sw.ToString();
}
But can I write to both a file and a string with the same XmlWriter instance?
You could create a method like this:
private static void WriteXML(TextWriter writer)
{
using (var xw = XmlWriter.Create(writer))
{
// Build the xml
}
}
And then call it like:
using (StreamWriter sw = new StreamWriter(...))
WriteXML(sw);
to write a file or
string xml = String.Empty;
using (StringWriter sw = new StringWriter())
{
WriteXML(sw);
xml = sw.ToString();
}
To create the string.
You could even create helper methods:
private static void WriteXMLFile(string fileName)
{
using (StreamWriter sw = new StreamWriter(...))
WriteXML(sw);
}
private static string GetXML()
{
using (StringWriter sw = new StringWriter())
{
WriteXML(sw);
return sw.ToString();
}
}
Create a composite XmlWriter which wraps many XmlWriter instances.
public class CompositeXmlWriter : XmlWriter
{
private readonly IEnumerable<XmlWriter> writers;
public CompositeXmlWriter(IEnumerable<XmlWriter> writers)
{
this.writers = writers;
}
public override void WriteStartDocument()
{
foreach (var writer in writers)
{
writer.WriteStartDocument();
}
}
public override void WriteEndDocument()
{
foreach (var writer in writers)
{
writer.WriteEndDocument();
}
}
...Implement all other methods
}
Create your CompositeXmlWriter with other XmlWriters.
using (var xw = new CompositeXmlWriter(new[] { XmlWriter.Create("myFile.xml"), XmlWriter.Create(new StringWriter())})
{
//Build the xml
}
Now whatever written in xw will be written in all the XmlWriters.
Related
I have a class like this:
public class Response
{
public String AdditionalData = "";
public Boolean Success = false;
public int ErrorCode = 0;
public int WarningCode = 0;
public Transaction TransactionInfo = null;
public PosInfo PosInformation = null;
}
and i can serialize this successfully. but when i serialize this class 2 times and save it in a XML file,multi root error appear in XML editor. i know it needs a XML element to be root to surround other tags, but i don't know how to add root element in a serialize code.
sterilizer class is below:
public class Serializer
{
public void XMLSerializer(Response response)
{
string path = "D:/Serialization.xml";
FileStream fs;
XmlSerializer xs = new XmlSerializer(typeof(Response));
if(!File.Exists(path))
{
fs = new FileStream(path, FileMode.OpenOrCreate);
}
else
{
fs = new FileStream(path, FileMode.Append);
}
StreamWriter sw = new StreamWriter(fs);
XmlTextWriter xw = new XmlTextWriter(sw);
xw.Formatting = System.Xml.Formatting.Indented;
xs.Serialize(xw, response);
xw.Flush();
fs.Close();
}
}
I would recommend improving your code to at least take care of disposable resources.
using Statement
Provides a convenient syntax that ensures the correct use of IDisposable objects.
public class Serializer
{
public void XMLSerializer(Response response)
{
string path = "D:/Serialization.xml";
var xs = new XmlSerializer(typeof(Response));
using (var fs = new FileStream(path, FileMode.OpenOrCreate))
{
using (var sw = new StreamWriter(fs))
{
using (var xw = new XmlTextWriter(sw))
{
xw.Formatting = System.Xml.Formatting.Indented;
xs.Serialize(xw, response);
xw.Flush();
}
}
fs.Close();
}
}
}
i have question!!
=============normal===========
class trx()
{
string trx_name;
string type_id;
}
var 0 = new trx(){trx_name="1",trx_name="2"}
---Entity change to xml
[XmlSerializer serializer = new XmlSerializer(typeof(trx));
[serializer.Serialize(File.OpenWrite(#".\MyXml.xml"), o);]
----XML result------
<trx>
<trx_name>1</trx_name>
<type_id>2</type_id>
</trx>
=============================
Q: but i need trx XML
<trx>
<trx_name>a</trx_name>
<trx_name>b</trx_name>
<trx_name>c</trx_name>
<trx_name>d</trx_name>
</trx>
how to solve the question???
Thanks in advance for your help
Something like this.
public class trx
{
public string trx_name { get; set; }
}
public class CustomSerializer
{
private static void Write(string filename)
{
List<trx> trxs = new List<trx>();
trxs.Add(new trx {trx_name = "Name1"});
trxs.Add(new trx {trx_name = "Name2"});
XmlSerializer x = new XmlSerializer(typeof (List<trx>));
TextWriter writer = new StreamWriter(filename);
x.Serialize(writer, trxs);
}
private static List<trx> Read(string filename)
{
var x = new XmlSerializer(typeof (List<trx>));
TextReader reader = new StreamReader(filename);
return (List<trx>) x.Deserialize(reader);
}
}
}
How can I serialize a property with CData? I have tried a few different methods including making the original property XmlIgnore and introducing a property which returns XmlCDataSection. None have worked so far.
I have the following runnable console test which shows the error. How can I modify this to allow the Regex data to serialize and deserialize.
using System;
using System.Collections.Generic;
using System.Linq;
namespace ConsoleApplication1
{
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Xml;
using System.Xml.Serialization;
[Serializable]
public class MyRegex
{
public string Regex { get; set; }
}
public static class SerializerHelper<T>
{
public static string Serialize(T myobject)
{
XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
StringWriter stringWriter = new StringWriter();
xmlSerializer.Serialize(stringWriter, myobject);
string xml = stringWriter.ToString();
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);
StringWriter sw = new StringWriter();
XmlTextWriter xw = new XmlTextWriter(sw);
xmlDoc.WriteTo(xw);
return sw.ToString();
}
public static T DeSerialize(string xml)
{
XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
StringReader stringReader = new StringReader(xml);
return (T)xmlSerializer.Deserialize(stringReader);
}
}
class Program
{
static void Main(string[] args)
{
MyRegex original = new MyRegex { Regex = "\b[1-3]{1}\b#Must be a value of 1 to 3" };
string xml = SerializerHelper<MyRegex>.Serialize(original);
Console.WriteLine("--- SERIALIZE ---");
Console.WriteLine(xml);
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("--- DESERIALIZE ---");
MyRegex deSerial = SerializerHelper<MyRegex>.DeSerialize(xml);
Console.WriteLine("Equals? " + (deSerial.Regex.Equals(original.Regex)));
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Console.ReadKey();");
Console.ReadKey();
}
}
}
Additional: Attempted replace method - not working
private string _regex;
public string Regex
{
get { return _regex.Replace(#"\\", #"\").Replace("&", "&").Replace("<", "<").Replace(">", ">").Replace(""", "\"").Replace("'", "'"); }
set { _regex = value.Replace(#"\", #"\\").Replace("&", "&").Replace("<", "<").Replace(">", ">").Replace("\"", """).Replace("'", "'"); }
}
You don't need to use CData here - the problem is that your Regex does not have the string "\b", it does have the \u0008 (BS) character - which is not what you need in the regular expression. If you escape the '\' in the MyRegex initialization, it should work:
MyRegex original = new MyRegex { Regex = "\\b[1-3]{1}\\b#Must be a value of 1 to 3" };
This console app is ready to run, and it serializes the data fine (using \b):
public class StackOverflow_6755014
{
public class MyRegex
{
public string Regex { get; set; }
}
public static class SerializerHelper<T>
{
public static string Serialize(T myobject)
{
XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
StringWriter stringWriter = new StringWriter();
xmlSerializer.Serialize(stringWriter, myobject);
string xml = stringWriter.ToString();
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);
StringWriter sw = new StringWriter();
XmlTextWriter xw = new XmlTextWriter(sw);
xmlDoc.WriteTo(xw);
return sw.ToString();
}
public static T DeSerialize(string xml)
{
XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
StringReader stringReader = new StringReader(xml);
return (T)xmlSerializer.Deserialize(stringReader);
}
}
public static void Test()
{
MyRegex original = new MyRegex { Regex = "\\b[1-3]{1}\\b#Must be a value of 1 to 3" };
string xml = SerializerHelper<MyRegex>.Serialize(original);
Console.WriteLine("--- SERIALIZE ---");
Console.WriteLine(xml);
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("--- DESERIALIZE ---");
MyRegex deSerial = SerializerHelper<MyRegex>.DeSerialize(xml);
Console.WriteLine("Equals? " + (deSerial.Regex.Equals(original.Regex)));
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Console.ReadKey();");
Console.ReadKey();
}
}
I am learning XML Serialization and meet an issue, I have two claess
[System.Xml.Serialization.XmlInclude(typeof(SubClass))]
public class BaseClass
{
}
public class SubClass : BaseClass
{
}
I am trying to serialize a SubClass object into XML file, I use blow code
XmlSerializer xs = new XmlSerializer(typeof(Base));
xs.Serialize(fs, SubClassObject);
I noticed Serialization succeed, but the XML file is kind of like
<?xml version="1.0"?>
<BaseClass xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="SubClass">
...
</Employee>
If I use
XmlSerializer xs = new XmlSerializer(typeof(Base));
SubClassObject = xs.Deserialize(fs) as SubClass;
I noticed it will complain xsi:type is unknown attribute(I registered an event), although all information embedded in the XML was parsed successfully and members in SubClassObject was restored correctly.
Anyone has any idea why there is error in parsing xsi:type and anything I did wrong?
Thanks
Here is the program that I wrote
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.IO;
namespace XmlIncludeExample
{
[XmlInclude(typeof(DerivedClass))]
public class BaseClass
{
public string ClassName = "Base Class";
}
public class DerivedClass : BaseClass
{
public string InheritedName = "Derived Class";
}
class Program
{
static void Main(string[] args)
{
string fileName = "Test.xml";
string fileFullPath = Path.Combine(Path.GetTempPath(), fileName);
try
{
DerivedClass dc = new DerivedClass();
using (FileStream fs = new FileStream(fileFullPath, FileMode.CreateNew))
{
XmlSerializer xs = new XmlSerializer(typeof(BaseClass));
xs.Serialize(fs, dc);
}
using (FileStream fs = new FileStream(fileFullPath, FileMode.Open))
{
XmlSerializer xs = new XmlSerializer(typeof(BaseClass));
DerivedClass dc2 = xs.Deserialize(fs) as DerivedClass;
}
}
finally
{
if (File.Exists(fileFullPath))
{
File.Delete(fileFullPath);
}
}
}
}
}
This produced the following xml
<?xml version="1.0" ?>
- <BaseClass xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:type="DerivedClass">
<ClassName>Base Class</ClassName>
<InheritedName>Derived Class</InheritedName>
</BaseClass>
And it worked
I got the same error.
I have not a great answer but this is what I have done:
using System;
using System.IO;
using System.Reflection;
using System.Xml;
using System.Xml.Serialization;
namespace HQ.Util.General
{
/// <summary>
/// Save by default as User Data Preferences
/// </summary>
public class XmlPersistence
{
// ******************************************************************
public static void Save<T>(T obj, string path = null) where T : class
{
if (path == null)
{
path = GetDefaultPath(typeof(T));
}
var serializer = new XmlSerializer(typeof(T));
using (TextWriter writer = new StreamWriter(path))
{
serializer.Serialize(writer, obj);
writer.Close();
}
}
// ******************************************************************
public static T Load<T>(string path = null,
Action<object, XmlNodeEventArgs> actionUnknownNode = null,
Action<object, XmlAttributeEventArgs> actionUnknownAttribute = null) where T : class
{
T obj = null;
if (path == null)
{
path = GetDefaultPath(typeof(T));
}
if (File.Exists(path))
{
var serializer = new XmlSerializer(typeof(T));
if (actionUnknownAttribute == null)
{
actionUnknownAttribute = UnknownAttribute;
}
if (actionUnknownNode == null)
{
actionUnknownNode = UnknownNode;
}
serializer.UnknownAttribute += new XmlAttributeEventHandler(actionUnknownAttribute);
serializer.UnknownNode += new XmlNodeEventHandler(actionUnknownNode);
using (var fs = new FileStream(path, FileMode.Open))
{
// Declares an object variable of the type to be deserialized.
// Uses the Deserialize method to restore the object's state
// with data from the XML document. */
obj = (T)serializer.Deserialize(fs);
}
}
return obj;
}
// ******************************************************************
private static string GetDefaultPath(Type typeOfObjectToSerialize)
{
return Path.Combine(AppInfo.AppDataFolder, typeOfObjectToSerialize.Name + ".xml");
}
// ******************************************************************
private static void UnknownAttribute(object sender, XmlAttributeEventArgs xmlAttributeEventArgs)
{
// Correction according to: https://stackoverflow.com/questions/42342875/xmlserializer-warns-about-unknown-nodes-attributes-when-deserializing-derived-ty/42407193#42407193
if (xmlAttributeEventArgs.Attr.Name == "xsi:type")
{
}
else
{
throw new XmlException("UnknownAttribute" + xmlAttributeEventArgs.ToString());
}
}
// ******************************************************************
private static void UnknownNode(object sender, XmlNodeEventArgs xmlNodeEventArgs)
{
// Correction according to: https://stackoverflow.com/questions/42342875/xmlserializer-warns-about-unknown-nodes-attributes-when-deserializing-derived-ty/42407193#42407193
if (xmlNodeEventArgs.Name == "xsi:type")
{
}
else
{
throw new XmlException("UnknownNode" + xmlNodeEventArgs.ToString());
}
}
// ******************************************************************
}
}
This example uses a StringWriter to hold the serialized data, then calling ToString() gives the actual string value:
Person john = new Person();
XmlSerializer xmlSerializer = new XmlSerializer(typeof(Person));
StringWriter stringWriter = new StringWriter();
xmlSerializer.Serialize(stringWriter, john);
string serializedXML = stringWriter.ToString();
Is there any easier/Cleaner way to do this? All of the Serialize() overloads seem to use a Stream or Writer.
UPDATE: Asked a similar question about serializing an IEnumerable via an Extension Method .
Fun with extension methods...
var ret = john.ToXmlString()
public static class XmlTools
{
public static string ToXmlString<T>(this T input)
{
using (var writer = new StringWriter())
{
input.ToXml(writer);
return writer.ToString();
}
}
public static void ToXml<T>(this T objectToSerialize, Stream stream)
{
new XmlSerializer(typeof(T)).Serialize(stream, objectToSerialize);
}
public static void ToXml<T>(this T objectToSerialize, StringWriter writer)
{
new XmlSerializer(typeof(T)).Serialize(writer, objectToSerialize);
}
}
More or less your same solution, just using an extension method:
static class XmlExtensions {
// serialize an object to an XML string
public static string ToXml(this object obj) {
// remove the default namespaces
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add(string.Empty, string.Empty);
// serialize to string
XmlSerializer xs = new XmlSerializer(obj.GetType());
StringWriter sw = new StringWriter();
xs.Serialize(sw, obj, ns);
return sw.GetStringBuilder().ToString();
}
}
[XmlType("Element")]
public class Element {
[XmlAttribute("name")]
public string name;
}
class Program {
static void Main(string[] args) {
Element el = new Element();
el.name = "test";
Console.WriteLine(el.ToXml());
}
}
I created this helper method, but I haven't tested it yet. Updated the code per orsogufo's comments (twice):
private string ConvertObjectToXml(object objectToSerialize)
{
XmlSerializer xmlSerializer = new XmlSerializer(objectToSerialize.GetType());
StringWriter stringWriter = new StringWriter();
xmlSerializer.Serialize(stringWriter, objectToSerialize);
return stringWriter.ToString();
}
Seems like no body actually answered his question, which is no, there is no way to generate an XML string without using a stream or writer object.