ElasticObject is a multi level dynamic object implementation using .NET 4.0 dynamic features, for fluent access of data types like XML.
For example, consider the XML
<entry name="user"/>
One possible use of ElasticObject is, you can access the same using fluent dynamic wrappers, like
var n=entry.name;
You can also use it like ExpandoObject, with multi level property support. To start with, here are few scenarios you can use ElasticObject
- An easier, fluid way to work with data formats � like XML and JSON. Presently, we�ve some support for XML.
- Cleaner code though it is duck typed
- A hierarchical way to maintain loosely typed data.
###How to use ElasticObject###
You can create dynamic objects with multiple levels of properties. ElasticObject has got its own conventions ;)
dynamic CreateStoreObject()
{
dynamic store = new ElasticObject("Store");
store.Name = "Acme Store";
store.Location.Address = "West Avenue, Heaven Street Road, LA";
store.Products.Count = 2;
store.Owner.FirstName = "Jack";
store.Owner.SecondName = "Jack";
//try to set the internal content for an element
store.Owner <<= "this is some internal content for owner";
//Add a new product
var p1 = store.Products.Product();
p1.Name = "Acme Floor Cleaner";
p1.Price = 20;
//Add another product
var p2 = store.Products.Product();
p2.Name = "Acme Bun";
p2.Price = 22;
return store;
}Now, you can convert this to XML quite easily, using the > operator. You can convert the XML back to elasticobject as well. See below.
var store = CreateStoreObject();
XElement el = store > FormatType.Xml;
dynamic storeClone = el.ToElastic();
XElement elCopy = storeClone > FormatType.Xml;
Assert.AreEqual(el.ToString(), elCopy.ToString());See the unit tests for more examples.
It is pretty easy to use ElasticObject to traverse XML. For example, here is a Console client that gets my Twitter timeline as XML, and print some properties.
Note the ToElastic extension method available for converting XElements to an ElasticObject
class Program
{
static void Main(string[] args)
{
var cl=new WebClient();
Console.WriteLine("Reading public time line");
using (var r = new StreamReader
(cl.OpenRead(@"http://twitter.com/statuses/user_timeline/amazedsaint.xml")))
{
var data = r.ReadToEnd();
IterateTweets(data);
}
Console.ReadLine();
}
static void IterateTweets(string data)
{
dynamic root = XElement.Parse(data).ToElastic();
foreach (var s in root["status"])
{
Console.WriteLine(~s.user.screen_name + " - " + ~s.text);
Console.WriteLine();
}
}
}
You can use ElasticObject to generate code using T4 from simple XML files. To install AmazedSaint.ElasticObject package from nuget, run the following command in the Package Manager Console
Install-Package AmazedSaint.ElasticObject
Or you can install this via the Nuget Package manager, it is your choice. See the example once you install the package.
- [Introduction To ElasticObject] (http://www.amazedsaint.com/2010/02/introducing-elasticobject-for-net-40.html)
- [XML driven Code Generation using T4 and ElasticObject] (http://www.amazedsaint.com/2012/02/xml-driven-ct4-code-generation-with.html)
- [Ariel Ben] (https://twitter.com/ArielBH) added Metro Support, and added a Portable library project file for your convenience
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