向用户显示文件的XML值的最佳方法是什么？

Question

I got a XML File, looking familiar to this :

<root>
 <carnumber>12</carnumber>
 <carcolor>2</carcolor>
 <cartype>5</cartype>
</root>

Like you see I got some Elements with values/text in it. The car element for example can take values from 1 to 1000. But the element carcolor can take values from 1 - 5 and the cartype from 1 - 10.

The important thing is that the values of the carcolor and cartype elements mean something. carcolor "2" means red, "1" blue and so on.

So I need to present the user not the values but the real meaning of the values.

I found myself creating some classes that represent the elements with there valid values and things got really complicated and I dont know if this was/is the best way.

A friend of mine suggested me to use XML serialization because my XML file is static. It will never change.

My question is simple. I just wanna know how you would solve this problem. My idea contains classes that represent the XML element, for example cartype within this class I have a Dictonary with a pair. This represent the values within the XML file and the string is the meaning of this value. And I use a lot of Linq to navigate and edit the values.

Thanks again!

Answer 1

This can be as complicated or easy as you want it to be. I would, however, second your friends suggestion to use XML Serialization, something like:

[XmlRoot("Car")]
public class Car
{
     public Car() 
     {
     }

     [XmlElement("Number")]
     public int Number { get; set; }

     [XmlElement("Color")]
     public int Color { get; set; }

     [XmlElement("Type")]
     public int Type { get; set; }
}

Serialization:

Car myCar = new Car();
myCar.Number = 1;
myCar.Color = 2;
myCar.Type = 3;

XmlSerializer s = new XmlSerializer(typeof(Car));
TextWriter w = new StreamWriter( @"c:\Car.xml" );
s.Serialize(w, myCar);
w.Close();

Deserialization:

Car myCar;
TextReader r = new StreamReader("Car.xml");
myCar = (Car)s.Deserialize(r);
r.Close();

You could further improve this by exposing a custom enum for the likes of your Type field and internally serializing the number relating to it. Also perhaps exposing the Color enum for the car and internally storing a numerical value.

Answer 2

Give this a try:

[XmlRoot("root")]
public class Car
{
    private static XmlSerializer serializer = new XmlSerializer(typeof(Car));

    [XmlElement("carnumber")]
    public int Number { get; set; }

    [XmlElement("carcolor")]
    public int Color { get; set; }

    [XmlElement("cartype")]
    public int Type { get; set; }

    [XmlIgnore]
    public CarColor CarColor
    {
        get
        {
            return (CarColor)Color;
        }
        set
        {
            Color = (int)value;
        }
    }

    [XmlIgnore]
    public CarType CarType
    {
        get
        {
            return (CarType)Type;
        }
        set
        {
            Type = (int)value;
        }
    }

    public string CarColorString
    {
        get
        {
            return this.CarColor.ToString().Replace('_', ' ');
        }
    }

    public string CarTypeString
    {
        get
        {
            return this.CarType.ToString().Replace('_', ' ');
        }
    }

    public string Serialize()
    {
        StringBuilder sb = new StringBuilder();
        using (StringWriter writer = new StringWriter(sb))
        {
            serializer.Serialize(writer, this);
        }
        return sb.ToString();
    }

    public static Car Deserialize(string xml)
    {
        using (StringReader reader = new StringReader(xml))
        {
            return (Car)serializer.Deserialize(reader);
        }
    }
}

public enum CarColor
{
    Red = 1,
    Blue = 2,
    Green = 3,
    Light_Brown = 4
    // and so on...
}

public enum CarType
{
    Sedan = 1,
    Coupe = 2,
    Hatchback = 3,
    SUV = 4,
    Pickup_Truck = 5
    // and so on...
}

I've added some enums to allow for presentation.

You can set the values of a Car and serialize it to an xml string:

Car car = new Car();
car.Number = 1;
car.CarColor = CarColor.Blue;
car.CarType = CarType.Coupe;
string xml = car.Serialize();

And deserialize an xml string into a car:

string example = 
@"<root>
 <carnumber>12</carnumber>
 <carcolor>2</carcolor>
 <cartype>5</cartype>
</root>";

Car car = Car.Deserialize(example);

For presentation, you can use the CarColorString and CarTypeString properties, which, in case your enum values contain more than one word, replace underscores with spaces.

Console.WriteLine(car.CarColorString);
Console.WriteLine(car.CarTypeString);

Answer 3

Why not format your XML file more like:

<root>
 <carnumber code="2" name="John's Car"/>
 <carcolor code="3" name="Red"/>
 <cartype code="2" name="Hatchback"/>
</root>

Answer 4

I would build the UI in WPF, not WinForms. Set up a data context that binds to the XML as an XML data source, write type converters to round trip the data between the internal and human-readable values, bind combo boxes to the various elements, and Bob's your uncle.

I recognize that this answer isn't very useful to you if you're not using WPF.