XLinq Extensions

XLinqExtensions

using System;
using System.Linq;
using System.Xml.Linq;
using System.Runtime.CompilerServices;
using System.Diagnostics;

//This class is simply used as a demonsration on how to use the extensions
public class Foo
{
    public static void Main()
    {
        XElement initial = new XElement("test", new XElement("Child"), new XElement("Child1", new XElement("Child1a")));

        for(int i = 0; i < 10; i++)
        {
           XElement merge = new XElement("test", new XElement("Child" + i));
        	initial.Merge(merge);
        }
        Console.WriteLine(initial.ToString());
        Console.WriteLine(new XElement("test", "Value").ValueOrEmpty());
        Console.WriteLine(new XElement("test", "1").ValueOrEmpty());
        Console.WriteLine(new XElement("test", "1").ValueOrDefault<int>());
        Console.WriteLine(new XElement("test", "1.000005").ValueOrDefault<double>());
        Console.WriteLine(new XElement("test", new XElement("test1", "True")).ValueOrDefault<Boolean>());
        Console.WriteLine(new XElement("test", "1").ValueOrDefault<test>());
        Console.WriteLine(new XElement("test").ValueOrDefault<int>());
        Console.WriteLine(new XElement("test").ValueOrDefault<double>());
        Console.WriteLine(new XElement("test").ValueOrDefault<String>());
        Console.WriteLine(new XElement("test", new XElement("test1")).ValueOrDefault<Boolean>());
        Console.WriteLine(new XElement("test").ValueOrDefault<test>());
        
        Console.Read();
    }
    
 
}

//Used for example purposes
public enum test
{
	one,
	two

}

//Extensions class
public static class XLinqExtensions
{
   //Merges Together Multiple similar XElements
   //In the future planning on having this have Join style behavior
   //And the ability to merge from certain levels
   //And the ability to compare on a certain node
   public static XElement Merge(this XElement obj, XElement merges)
   {
      	XElement objCopy = obj;
       
      	if (objCopy.Name == merges.Name)
      	{
          	foreach(XElement descendant in merges.Elements())
          	{
              	if(objCopy.Elements().Where(x =>x.Name == descendant.Name).Any())
              	{
               	XElement temp = objCopy.Element(descendant.Name);
               	//temp = new XElement(objCopy.Element(descendant.Name).Merge(descendant));
           		temp = (objCopy.Element(descendant.Name).Merge(descendant));
           	}
           	else
           	{
           		objCopy.Add(descendant);
           	}
           }
       }
       else
       {
          objCopy.Add(merges);
       }
       return objCopy;
    }
    
    //Returns the Value at the node or String.Empty
    public static String ValueOrEmpty(this XElement element)
    {
    	return element.Value ?? "";
    }
    
    //Returns a Value of Type T or a default T
    public static T ValueOrDefault<T>(this XElement element)
    {
    	return (T)genConvert<T>(element.Value);
    }
	
	//Used for conversion of the Value to a T
	private static T genConvert<T>(String str)
	{
		//Try to get a converter for T
		var converter = System.ComponentModel.TypeDescriptor.GetConverter(typeof(T));
		
		//Is there a converter
    	if(converter != null)
    	{
    		//For now try the conversion, if it doesn't work return the default value for T
    		try
    		{
       	 		return (T)converter.ConvertFromString(str);
       	 	}
       	 	catch
       	 	{
       	 		return default(T);
       	 	}
    	}
    	return default(T);
	}
}