How to export/generate XML file with METADATA in ASP.NET Core using C#?
I need to get data from database, massage it into list of objects, then finally generate an XML file with a METADATA tag (expected result), I think those DATA PACKET, METADATA, etc.. tag is not manually written it, maybe there is some library in ASP.NET Core using C# able to generate it automatically when serializing the data into XML?
Here is the code I tried out, it didn't turns out to expected result as I need it.
public class Book
{
public string title;
public string author;
public string publisher;
public double price;
}
public void GenerateXML()
{
var overview = new List<Book>{
new Book()
{
title = "This is a book",
author = "Somebody wrote it",
publisher = "Someone published it",
price = 999.99
},
new Book()
{
title = "This is a book2",
author = "Somebody wrote it2",
publisher = "Someone published it2",
price = 101010
}
};
System.Xml.Serialization.XmlSerializer writer = new System.Xml.Serialization.XmlSerializer(typeof(Book));
var path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "//myXmFile.xml";
System.IO.FileStream file = Syst开发者_如何学运维em.IO.File.Create(path);
foreach (var item in overview)
{
writer.Serialize(file, item);
}
file.Close();
}
This code produces:
<?xml version="1.0" encoding="utf-8"?>
<Book xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<title>
This is a book
</title>
<author>
Somebody wrote it
</author>
<publisher>
Someone published it
</publisher>
<price>
999.99
</price>
</Book>
<?xml version="1.0" encoding="utf-8"?>
<Book xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<title>
This is a book2
</title>
<author>
Somebody wrote it2
</author>
<publisher>
Someone published it2
</publisher>
<price>
101010
</price>
</Book>
Expected result:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<DATAPACKET Version="2.0">
<METADATA>
<FIELDS>
<FIELD attrname="title" fieldtype="string"/>
<FIELD attrname="author" fieldtype="string"/>
<FIELD attrname="publisher" fieldtype="string"/>
<FIELD attrname="price" fieldtype="r8"/>
</FIELDS>
<PARAMS/>
</METADATA>
<ROWDATA>
<ROW title="This is a book" author="Somebody wrote it" publisher="Someone published it" price="999.99" />
<ROW title="This is a book2" author="Somebody wrote it2" publisher="Someone published it2" price="101010" />
</ROWDATA>
</DATAPACKET>
Is there any library in ASP.NET Core / C# able to generate this expected result?
Here is the code. I generated the class using https://xmltocsharp.azurewebsites.net/
Generated class.
[XmlRoot(ElementName = "FIELD")]
public class Field
{
[XmlAttribute(AttributeName = "attrname")]
public string Attrname { get; set; }
[XmlAttribute(AttributeName = "fieldtype")]
public string Fieldtype { get; set; }
}
[XmlRoot(ElementName = "FIELDS")]
public class Fields
{
[XmlElement(ElementName = "FIELD")]
public List<Field> Field { get; set; }
}
[XmlRoot(ElementName = "METADATA")]
public class MetaData
{
[XmlElement(ElementName = "FIELDS")]
public Fields Fields { get; set; }
[XmlElement(ElementName = "PARAMS")]
public string Params { get; set; }
}
[XmlRoot(ElementName = "ROW")]
public class Book
{
[XmlAttribute(AttributeName = "title")]
public string Title { get; set; }
[XmlAttribute(AttributeName = "author")]
public string Author { get; set; }
[XmlAttribute(AttributeName = "publisher")]
public string Publisher { get; set; }
[XmlAttribute(AttributeName = "price")]
public string Price { get; set; }
}
[XmlRoot(ElementName = "ROW")]
public class Student
{
[XmlAttribute(AttributeName = "name")]
public string Name { get; set; }
[XmlAttribute(AttributeName = "age")]
public int Age { get; set; }
}
[XmlRoot(ElementName = "ROWDATA")]
public class RowData<T>
{
[XmlElement(ElementName = "ROW")]
public List<T> Row { get; set; }
}
[XmlRoot(ElementName = "DATAPACKET")]
public class DataPacket<T>
{
[XmlElement(ElementName = "METADATA")]
public MetaData MetaData { get; set; }
[XmlElement(ElementName = "ROWDATA")]
public RowData<T> RowData { get; set; }
[XmlAttribute(AttributeName = "Version")]
public string Version { get; set; }
}
I modified the generated code a little bit.
And here is the XML generation logic.
public IActionResult GenerateXmlStudent()
{
var dataPacket = new DataPacket<Student>();
dataPacket.MetaData = new MetaData();
dataPacket.MetaData.Fields = new Fields();
dataPacket.MetaData.Fields.Field = new List<Field>();
dataPacket.MetaData.Fields.Field.Add(new Field { Attrname = "name", Fieldtype = "string" });
dataPacket.MetaData.Fields.Field.Add(new Field { Attrname = "age", Fieldtype = "int" });
dataPacket.MetaData.Params = "name,age";
dataPacket.RowData = new RowData<Student>();
dataPacket.RowData.Row = new List<Student>();
dataPacket.RowData.Row.Add(new Student { Name = "Student1", Age = 20 });
dataPacket.RowData.Row.Add(new Student { Name = "Student2", Age = 20 });
dataPacket.RowData.Row.Add(new Student { Name = "Student3", Age = 20 });
dataPacket.RowData.Row.Add(new Student { Name = "Student4", Age = 20 });
var xmlSerializer = new XmlSerializer(typeof(DataPacket<Student>));
using var stringWriter = new StringWriter();
xmlSerializer.Serialize(stringWriter, dataPacket);
var xml = stringWriter.ToString();
return Content(xml, "text/xml");
}
And the other class.
public IActionResult GenerateXmlBook()
{
var dataPacket = new DataPacket<Book>();
dataPacket.MetaData = new MetaData();
dataPacket.MetaData.Fields = new Fields();
dataPacket.MetaData.Fields.Field = new List<Field>();
dataPacket.MetaData.Fields.Field.Add(new Field { Attrname = "title", Fieldtype = "string" });
dataPacket.MetaData.Fields.Field.Add(new Field { Attrname = "author", Fieldtype = "string" });
dataPacket.MetaData.Fields.Field.Add(new Field { Attrname = "publisher", Fieldtype = "string" });
dataPacket.MetaData.Fields.Field.Add(new Field { Attrname = "price", Fieldtype = "string" });
dataPacket.MetaData.Params = "title,author,publisher,price";
dataPacket.RowData = new RowData<Book>();
dataPacket.RowData.Row = new List<Book>();
dataPacket.RowData.Row.Add(new Book { Title = "The Hobbit", Author = "J.R.R. Tolkien", Publisher = "Houghton Mifflin", Price = "29.99" });
dataPacket.RowData.Row.Add(new Book { Title = "Harry Potter and the Sorcerer's Stone", Author = "J.K. Rowling", Publisher = "Scholastic", Price = "29.99" });
dataPacket.RowData.Row.Add(new Book { Title = "The Lord of the Rings", Author = "J.R.R. Tolkien", Publisher = "Houghton Mifflin", Price = "29.99" });
dataPacket.RowData.Row.Add(new Book { Title = "The Da Vinci Code", Author = "Dan Brown", Publisher = "Doubleday", Price = "29.99" });
var xmlSerializer = new XmlSerializer(typeof(DataPacket<Book>));
using var stringWriter = new StringWriter();
xmlSerializer.Serialize(stringWriter, dataPacket);
var xml = stringWriter.ToString();
return Content(xml, "text/xml");
}
And here is the screenshot.
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