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26 Mar

The current version of ADO.Net Data Services (Astoria) for Silverlight generates some extremely Buy valium from trusted pharmacy, Plain Old CLR Objects. As Shawn Wildermuth notes, buy valium online with no prescription, Valium from international pharmacy, you dont even get INotifyPropertyChanged support. You might need this if you want to databind directly to your Astoria entities, cod online valium, Valium overseas, but if you're doing serious Silverlight work, it pays to wrap your entities up in a ViewModel, ordering valium online. Buy valium online without a prescription, Even if you're doing this, having INotifyPropertyChanged support can really help - for example, valium from canadian pharmacy, Valium in mexico, instead of saving every single entity on your model, you only need to fire the ones that change, valium discount. Free valium samples, For example:

entity.PropertyChanged += (sender, e) => dataContext.UpdateObject(sender);

Pretty soon, saturday delivery valium, Buy valium online with no prescription, this functionality will be built into Astoria. In the meantime, however, it's possible to add this functionality thanks to the partial methods in the web reference-generated entity, buy valium from trusted pharmacy. When you add an Astoria web reference to a silverlight project, where can i order valium without prescription, Valium discount, the two most interesting things that get added (expand the service reference to see these files) are:

Reference.cs


This is the C# file that contains all of the code relating to the service reference. Look inside and you will see your DataContext and all of your Entities, valium craiglist. Rx free valium, Note that your entities don't fire property changed events, but they do define partial methods:
        
public string City
{
get
{
return this._City;
}
set
{
this.OnCityChanging(value);
this._City = value;
this.OnCityChanged();
}
}
private string _City;
partial void OnCityChanging(string value);
partial void OnCityChanged();

service.edmx


This is an XML file that defines, order valium from mexican pharmacy, Order valium online overnight delivery no prescription, among other things, each of the entities in your service reference:
      <EntityType Name="Address">
<Key>
<PropertyRef Name="ID" />
</Key>
<Property Name="ID" Type="Edm.Int32" Nullable="false" />
<Property Name="Line1" Type="Edm.String" Nullable="true" />
<Property Name="Line2" Type="Edm.String" Nullable="true" />
<Property Name="City" Type="Edm.String" Nullable="true" />
<Property Name="Country" Type="Edm.String" Nullable="true" />
</EntityType>

This XML file serves as the perfect source for our data generation template, buy valium online without a prescription. Where can i buy cheapest valium online,

DataServiceINotifyPropertyChanged


If you're not familiar with T4 code generation and it's integration into visual studio, now would be a good time to go and read Oleg Sych's blog - he covers EVERYTHING, cod online valium. Buy valium from trusted pharmacy, Or you could just go ahead and incorporate my template into your Silverlight project - it works on my machine! 

In order to make the namespace of the generated file match the namespace of your service classes, you need to put this template into a top level folder that matches the name of your service reference. Valium in mexico, The template will use that directory name to find the edmx file in question:

T4 Template

 

Basically, the template loops over all the entities in the edmx, valium prices, Valium for sale, generates a partial class (which will match the service entities), then loops over all the properties and generated a partial method implementation, valium buy online. Online buy valium without a prescription, Easy.

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30 Sep

Buy yaz from trusted pharmacy, It's been too long since I promised to post this. But it's worth it, sale yaz, Buy generic yaz, I promise you. If you just want to grab the code, online buying yaz hcl, Order yaz from mexican pharmacy, it's at the bottom of this post.

What we have here is another do it yourself dependency injection container, where to buy yaz. Rx free yaz, I release it to you, dear world, buy yaz online without a prescription, Buying yaz online over the counter, free of charge, warranty or care, buy yaz no prescription.

Pros:


  • You can paste the code straight into your project - no DLL dependencies (easy to deploy, get approved, source control)

  • It won't bulk up your silverlight application

  • It performs super-fast if you're using it to resolve singletons

  • It can do lots of the things that the "real" DI containers can do (named parameters, value parameters, lifestyle choices)

  • It's got a fluent interface


Cons



  • There's a bunch of stuff that the real containers can do that mine can't (consider this DIY container a "gateway drug"), buy yaz from trusted pharmacy. Yaz gel, ointment, cream, pill, spray, continuous-release, extended-release, That said, I seem to have covered three of Oren's four basic requirements, yaz overseas, Yaz from canadian pharmacy, and i think it's pretty easy to use...

  • If you are doing a lot of transient resolves (say per each page request) you will find reflection is just too slow.

  • This version depends on LINQ and lambdas, so it's VS 2008 only.



the tests:
[TestClass]
public class DemoContainerTest
{
[TestMethod]
public void NamedRegistration()
{
Container c = new Container();
c.Register<IMathNode, buy yaz without a prescription, Where can i buy yaz online, Zero>("zero");
IMathNode m = c.Resolve<IMathNode>("zero");
Assert.AreEqual(0, m.Calculate());
}

[TestMethod]
public void AnonymousRegistration()
{
Container c = new Container();
c.Register<IMathNode, buy yaz online without prescription, Yaz in australia, Zero>();
IMathNode m = c.Resolve<IMathNode>();
Assert.AreEqual(0, m.Calculate());
}

[TestMethod]
public void AnonymousSubDependency()
{
Container c = new Container();
c.Register<IMathNode, next day yaz, Yaz price, coupon, Zero>();
c.Register<IFormatter, MathFormatter>();
IFormatter m = c.Resolve<IFormatter>();
Assert.AreEqual("$0.00", buy yaz online with no prescription, Delivered overnight yaz, m.Format("C2"));
}

[TestMethod]
public void WithValue()
{
Container c = new Container();
c.Register<IMathNode, Number>("five").WithValue("number", yaz in usa, Yaz in india, 5);
int i = c.Resolve<IMathNode>("five").Calculate();
Assert.AreEqual(5, i);
}

[TestMethod]
public void NamedSubDependency()
{
Container c = new Container();
c.Register<IMathNode, order yaz from United States pharmacy, Yaz paypal, Number>("five").WithValue("number", 5);
c.Register<IMathNode, yaz from international pharmacy, Yaz trusted pharmacy reviews, Number>("six").WithValue("number", 6);
c.Register<IMathNode, ordering yaz online, Yaz san diego, Add>("add").WithDependency("m1", "five").WithDependency("m2", yaz to buy, Yaz prices, "six");
int i = c.Resolve<IMathNode>("add").Calculate();
Assert.AreEqual(11, i);
}

[TestMethod]
public void NamedSubDependencyOutOfOrder()
{

Container c = new Container();
c.Register<IMathNode, where can i buy cheapest yaz online, Yaz medication, Add>("add").WithDependency("m1", "five").WithDependency("m2", where can i find yaz online, Purchase yaz online no prescription, "six");
c.Register<IMathNode, Number>("five").WithValue("number", yaz prescriptions, Cod online yaz, 5);
c.Register<IMathNode, Number>("six").WithValue("number", yaz pills, Over the counter yaz, 6);
int i = c.Resolve<IMathNode>("add").Calculate();
Assert.AreEqual(11, i);
}

[TestMethod]
public void Singleton()
{
Container c = new Container();
c.Register<IMathNode, free yaz samples, Yaz to buy online, Zero>().AsSingleton();
Assert.AreSame(c.Resolve<IMathNode>(), c.Resolve<IMathNode>());
}

[TestMethod]
public void NonSingleton()
{
Container c = new Container();
c.Register<IMathNode, yaz price, coupon, Yaz discount, Zero>();
Assert.AreNotSame(c.Resolve<IMathNode>(), c.Resolve<IMathNode>());
}

public interface IFormatter
{
string Format(string format);
}

public class MathFormatter : IFormatter
{
private readonly IMathNode math;

public MathFormatter(IMathNode math)
{
this.math = math;
}

public string Format(string format)
{
return math.Calculate().ToString(format);
}
}

public interface IMathNode
{
int Calculate();
}

public class Zero : IMathNode
{
public int Calculate()
{
return 0;
}
}

public class Number : IMathNode
{
private int number;

public Number(int number)
{
this.number = number;
}

public int Calculate()
{
return number;
}
}

public class Add : IMathNode
{
private IMathNode m1, online buying yaz hcl, Free yaz samples, m2;

public Add(IMathNode m1, IMathNode m2)
{
this.m1 = m1;
this.m2 = m2;
}

public int Calculate()
{
return m1.Calculate() + m2.Calculate();
}
}

}


The container:

The way this bad boy works is by storing dictionary of services as "Func<object>"s, yaz in us. Yaz over the counter, These are keyed by name, which is usually provided by the Resolve method, purchase yaz. Cod online yaz, If the parameterless overload of resolve is used, then the service name is looked up in the dictionary serviceNames, yaz in canada. Buy yaz without prescription, This simply stores the first  ever registration of a service type's name. Buy yaz from trusted pharmacy, If the nameless Register method is used, then a random name is generated.

Whenever you register a component, yaz in australia, Buy cheap yaz, you get back a "dependency manager" object. That object lets you specify further configuration on your component via a fluent interface, yaz in uk. Yaz buy online, It contains most of the logic for resolving an object, and manages the parent container's Func<object> for resolving that dependency, buy cheap yaz no rx. Buy generic yaz,

public class Container
{
protected readonly Dictionary<string, Func<object>> services = new Dictionary<string, over the counter yaz, Purchase yaz online, Func<object>>();
protected readonly Dictionary<Type, string> serviceNames = new Dictionary<Type, online buy yaz without a prescription, Buy yaz online no prescription, string>();

public DependencyManager Register<S, C>() where C : S
{
return Register<S, purchase yaz online no prescription, Where can i find yaz online, C>(Guid.NewGuid().ToString());
}

public DependencyManager Register<S, C>(string name) where C : S
{
if (!serviceNames.ContainsKey(typeof(S)))
{
serviceNames[typeof(S)] = name;
}
return new DependencyManager(this, yaz for sale, Yaz tablets, name, typeof(C));
}

public T Resolve<T>(string name) where T : class
{
return (T)services[name]();
}

public T Resolve<T>() where T : class
{
return Resolve<T>(serviceNames[typeof(T)]);
}

public class DependencyManager
{
private readonly Container container;
private readonly Dictionary<string, yaz to buy online, Func<object>> args;
private readonly string name;

internal DependencyManager(Container container, string name, Type type)
{
this.container = container;
this.name = name;

ConstructorInfo c = type.GetConstructors().First();
args = c.GetParameters()
.ToDictionary<ParameterInfo, string, Func<object>>(
x => x.Name,
x => (() => container.services[container.serviceNames[x.ParameterType]]())
);

container.services[name] = () => c.Invoke(args.Values.Select(x => x()).ToArray());
}

public DependencyManager AsSingleton()
{
object value = null;
Func<object> service = container.services[name];
container.services[name] = () => value ?. (value = service());
return this;
}

public DependencyManager WithDependency(string parameter, string component)
{
args[parameter] = () => container.services[component]();
return this;
}

public DependencyManager WithValue(string parameter, object value)
{
args[parameter] = () => value;
return this;
}
}
}

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10 Sep

Buy ultram from trusted pharmacy, I don't think I've seen a single project without some form of string parsing: int.Parse(txtName.Text), anyone?.


Here's a cool way to take a string and parse it to whatever you want, enum, double, bool, it works on anything that's both IConvertible and a struct (ok I lied about "anything"). It's an extension method, ultram in india, Ultram medication, but could just be a library call if that pleases you (or your compiler) more.


 


public static T. As<T>(this string s) where T : struct, delivered overnight ultram, Real brand ultram online, IConvertible
{
try
{
Type type = typeof(T);
bool isEnum = typeof(Enum).IsAssignableFrom(type);
return (T)(isEnum
. Enum.Parse(type, buy ultram online with no prescription, Where to buy ultram, s, true)
: Convert.ChangeType(s, buy ultram online without prescription, Order ultram no prescription, type));
}
catch
{
return null;
}
}

Note that it just returns null if the parse fails - this actually ends up being really simple to use:



  • If you KNOW the parse shouldn't fail, you just call .Value - which will give you an exception if the parse somehow did fail (this is a good thing)

  • If you want to see if the parse failed, ultram paypal, Buy ultram from mexico, you can check the .HasValue property

  • If you want to provide a fallback value, you can just use the ?, sale ultram. Fast shipping ultram, operator





Here are the TDD tests for the code, to give you idea of how flexible this is:


[TestMethod]
public void StringAsInt()
{
Assert.AreEqual(5, where can i buy ultram online, Ultram craiglist, "5".As<int>());
Assert.AreEqual(25, "25".As<int>());
Assert.AreEqual(null, saturday delivery ultram, Ultram san diego, "foobar".As<int>());
}

[TestMethod]
public void StringAsDouble()
{
Assert.AreEqual(5.5, "5.5".As<double>());
Assert.AreEqual(-25.2, ordering ultram online, Buy ultram online cod, "-25.2".As<double>());
Assert.AreEqual(null, "foobar".As<double>());
}

[TestMethod]
public void StringAsBool()
{
Assert.AreEqual(true, ultram in japan, Ultram pills, "true".As<bool>());
Assert.AreEqual(false, "false".As<bool>());
Assert.AreEqual(null, buy ultram from canada, Ultram from international pharmacy, "foobar".As<bool>());
}

[TestMethod]
public void StringParseEnum()
{
Assert.AreEqual(ContactPreference.Email, "Email".As<ContactPreference>());
Assert.AreEqual(null, buy ultram no prescription, Ultram overseas, "Schmemail".As<ContactPreference>());
Assert.AreEqual(null, ((string)null).As<ContactPreference>());
Assert.AreEqual(ContactPreference.MobilePhone, buy no prescription ultram online, Ultram prices, "MobilePhone".As<ContactPreference>());
}
enum ContactPreference
{
Email,
MobilePhone
}

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02 Sep

Buy antabuse from trusted pharmacy, Here are my slides and the source code to the TDD & DI talk I gave at CodeCamp Auckland 2008. My intent with the talk was to explain how TDD can be really good, where can i buy cheapest antabuse online, Buy antabuse from canada, and how DI can make TDD easier.

If you weren't at my talk and have any questions - I'm in the market for more comments, antabuse in japan. Online buying antabuse hcl, I've got one more link to add, these podcasts were what actually inspired my subject: http://channel9.msdn.com/shows/ARCast+with+Ron+Jacobs/ARCastnet-Presenter-First-Pattern-Part-1/

Here is my source code (perfectly commented), where can i buy antabuse online, Rx free antabuse, and here are my slides

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Posted in .Net, Testing

 

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31 Aug

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The fact that I got to speak wasn't what made the day so great for me, order lumigan from United States pharmacy. No - it was the content of the other speakers and having such interesting conversations with everyone else who came, buy lumigan from trusted pharmacy. Lumigan in us, The people that turn up to these community things are the ones who really care about what they do.

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Slides & Source from my Silverlight talk

08 Aug
My thanks to everyone who came to my talk... I promised I'd put my slides up on the interwebs. Here are the slides and here is the source code If you do want to run the system, the first thing to do is browse to default.aspx, and then .net will create the membership database (10 megs) for you. I deleted this just before i uploaded the code. You can log in anonymously as well. If anyone's thought of some more questions, please post a comment right here or email me (rob@robfe.com). To the software engineering student who wanted to embed her own silverlight app onto any old web page, I had a brainwave after I answered your question. You can probably use a bookmarklet (like firebug lite do) to insert your own content (div + silverlight loader) into whatever page the user is looking at. It'd definitely be easier than writing a plugin. If you don't want the user to have to click the bookmarklet for every page they want your widget on, GreaseMonkey is a firefox plugin that you can configure to automatically run javascript on any web page. Feel free to email me for more details
 
7 Comments

Posted in .Net

 

Awesome Object to XML conversion

03 Aug
Microsoft are taking their sweet time releasing a production version of LINQ to XSD. I have played with both of the alphas, and they are seriously the most perfect way to deal with strongly typed XML. I hope you've played with the new System.Linq.XML bits, they make xml operations a lot easier. However, when you've got an XSD file, you know exactly what kinds of elements and attributes you should be generating, and it seems like hardcoding in those strings is error-prone. Back in .net 2, I used to use xsd.exe to generate a class that was in effect a strongly typed map to the desired XML format. Then it's totally easy to convert from that object to XML and back. Now, in .net 3.5, you can use vanilla LINQ to populate these data classes, which is certainly nicer to read. But it feels somehow low tech. Plus it feels cumbersome to have to generate the classes from the command prompt, I want visual studio to mollycoddle me (and stop anyone from making changes to the generated file in case I want to regenerate!) The promise of LINQ to XSD, however, is slightly different. And awesome. You put your XSD file into your project. Change the build action (or maybe it's the custom tool, it's been a while since I checked). After that, as a precompile step in your build, visual studio will regenerate a set of classes that strongly type your XSD. What's so cool about that (apart from the fact that you don't have to drop to the command prompt?) Well now the new classes are already backed (ie, keep all their data in) by System.Linq.XML.XElements - no more mucking about with the XMLSerializer. And for two, the classes have been infused with some validation, so if you try to set a property with a value that the schema considers invalid, you'll get an error immediately (ie: you can see which line of code caused the problem). Awesome. For further reading, check out what Scott Hanselman has to say about the "life" of the project. He explains Linq to XSD pretty well too. And if you get a chance, make some noise, I'd really like to see this released!
 
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Posted in .Net