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Albuterol (Ventolin) For Sale, I had a situation today which I thought was prime for writing some extension methods: I wasn't allowed to modify the original type, and I also couldn't subclass it, either. Extension methods to the rescue, discount Albuterol (Ventolin). Albuterol (Ventolin) results, One thing which made the situation slightly interesting though, was that the original type also had a whole bunch of derived types - and for each of them, is Albuterol (Ventolin) addictive, Purchase Albuterol (Ventolin) for sale, I wanted to customise the relevant extension method. Well, my Albuterol (Ventolin) experience, Albuterol (Ventolin) brand name, that's all well and good, but what I really wanted to know was: lets say I was operating on a collection of the base types (where each individual item was an instance of a derived type), Albuterol (Ventolin) gel, ointment, cream, pill, spray, continuous-release, extended-release, Albuterol (Ventolin) without a prescription, which extension method would get invoked.

Only one way to find out - write some code, cheap Albuterol (Ventolin). For simplicity, I used the base class Animal, and added two derived types: Dog and Elephant, Albuterol (Ventolin) For Sale. Albuterol (Ventolin) steet value, [csharp]
public abstract class Animal
{
public string Name { get; set; }
public bool HasBoyBits { get; set; }
public abstract string Type { get; }
}

public class Dog : Animal
{
public string Breed { get; set; }

public override string Type
{
get { return "Dog"; }
}
}

public class Elephant : Animal
{
public bool HasTusks { get; set; }

public override string Type
{
get { return "Elephant"; }
}
}
[/csharp]

Now for the extension method: CanBreed. For the base type Animal, where can i cheapest Albuterol (Ventolin) online, Real brand Albuterol (Ventolin) online, the rule was simple - the animals had to be of the same type, and of the opposite sex:

[csharp]
public static class AnimalExtensions
{
public static bool CanBreedWith(this Animal animal, buy cheap Albuterol (Ventolin), Where to buy Albuterol (Ventolin), Animal other)
{
return animal.Type == other.Type
&& animal.HasBoyBits != other.HasBoyBits;
}
}
[/csharp]

For dogs, we only want to breed with dogs that are already of the same pedigree; and for elephants, Albuterol (Ventolin) no rx, Albuterol (Ventolin) price, we only want to breed with other elephants that have the same tusk status (yes, it's pretty ambiguous, buy Albuterol (Ventolin) without a prescription, Albuterol (Ventolin) no prescription, but whatever):

[csharp]
public static class DogExtensions
{
public static bool CanBreedWith(this Dog dog, Animal other)
{
return AnimalExtensions.CanBreedWith(dog, Albuterol (Ventolin) cost, Albuterol (Ventolin) used for, other)
&& ((Dog) other).Breed == dog.Breed;
}
}

public static class ElephantExtensions
{
public static bool CanBreedWith(this Elephant elephant, Animal other)
{
return AnimalExtensions.CanBreedWith(elephant, Albuterol (Ventolin) images, Online buy Albuterol (Ventolin) without a prescription, other)
&& ((Elephant) other).HasTusks == elephant.HasTusks;
}
}
[/csharp]

Finally, the test data: two lists of animals, fast shipping Albuterol (Ventolin), Albuterol (Ventolin) coupon, separated by gender:

[csharp]
var baxter = new Dog { Name = "Baxter", HasBoyBits = true, low dose Albuterol (Ventolin), Albuterol (Ventolin) blogs, Breed = "Jack Russell" };
var missy = new Dog { Name = "Missy", HasBoyBits = false, order Albuterol (Ventolin) online overnight delivery no prescription, Buy Albuterol (Ventolin) without prescription, Breed = "Jack Russell" };
var jazzy = new Dog { Name = "Jazzy", HasBoyBits = false, order Albuterol (Ventolin) no prescription, Online buying Albuterol (Ventolin) hcl, Breed = "Poodle" };

List<Animal> boys = new List<Animal>
{
baxter,
new Elephant { Name = "Lance", Albuterol (Ventolin) pharmacy, Is Albuterol (Ventolin) safe, HasBoyBits = true, HasTusks = true }
};

List<Animal> girls = new List<Animal>
{
missy, Albuterol (Ventolin) trusted pharmacy reviews, Effects of Albuterol (Ventolin), jazzy,
new Elephant { Name = "Renee", about Albuterol (Ventolin), HasBoyBits = false, HasTusks = true },
new Elephant { Name = "Hephalump", HasBoyBits = false, HasTusks = false }
};
[/csharp]

Now, what I had to test was if .NET would use the Runtime type of each animal to work out which extension method to invoke. I was pretty confident that both of these would pass:

[csharp]
Assert.IsTrue(baxter.CanBreedWith(missy));
Assert.IsFalse(baxter.CanBreedWith(jazzy));
[/csharp]

And sure enough, the unit test succeeds with flying colours. However, to make things slightly trickier, what if we do this. Albuterol (Ventolin) For Sale, [csharp]
foreach (var boy in boys)
{
foreach (var girl in girls)
{
bool canBreed = boy.CanBreedWith(girl);

Console.WriteLine("{0} can{2} breed with {1}",
boy.Name, girl.Name, canBreed . String.Empty : "'t");
}
}
[/csharp]

Unfortunately, here's what the output looks like:

Baxter can breed with Missy
Baxter can breed with Jazzy
Baxter can't breed with Renee
Baxter can't breed with Hephalump
Lance can't breed with Missy
Lance can't breed with Jazzy
Lance can breed with Renee
Lance can breed with Hephalump

So we can see that the animals aren't allowed to breed when they're of differing types (hence AnimalExtensions.CanBreedWith is being invoked); however, each type of animal is allowed to breed with any other animal of the same type. No joy. (Well, joy for the animals I suppose...)

On retrospect, this is pretty much the behavior that I expected, but I was still disappointed to find out that I had been right. Worse still, once the sample code was up and running, I thought, "Hey, I should have used Rabbits instead of Elephants, and then always returned false in the CanBreed method, because that would have been funnier". Ahh, hindsight, where were you before.

Oh well. Time for some refactoring.

Posted in .Net, C# at July 25th, 2011. 1 Comment.

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Buy Albuterol (Ventolin) Without Prescription, Debugging can be tricky when you're trying to inspect a collection of objects that superficially all look the same. But there's a few things you can do to alleviate that problem, cheap Albuterol (Ventolin) no rx, Herbal Albuterol (Ventolin), and a few gotchas to try and avoid, too, Albuterol (Ventolin) online cod. Canada, mexico, india, Lets say you have a simple class called TimeRange, which defines a start time and an end time, Albuterol (Ventolin) dosage, Albuterol (Ventolin) interactions, and also has a calculated property for the length of time it represents. Your class might look something like this:

[csharp]
public class TimeRange
{
public TimeSpan Start { get; set; }
public TimeSpan End { get; set; }

public TimeSpan Length
{
get { return End.Subtract(Start); }
}
}
[/csharp]

Now, kjøpe Albuterol (Ventolin) på nett, köpa Albuterol (Ventolin) online, Albuterol (Ventolin) maximum dosage, lets say you create a list of these Time Ranges. When you debug your file, Albuterol (Ventolin) reviews, Purchase Albuterol (Ventolin), inspecting the list will give you a picture like this:

That's not very helpful now, is it?, Albuterol (Ventolin) pics. It would be much easier to work out what was going on if the debugger showed us a little bit about each time range, rather than simply the object type's full name, Buy Albuterol (Ventolin) Without Prescription. Japan, craiglist, ebay, overseas, paypal, Thankfully, it's actually pretty easy to customise what the debugger displays during object inspection using one of two methods:

The "hard" way: Decorate your class with the DebuggerDisplayAttribute (which you can read about here), Albuterol (Ventolin) canada, mexico, india. Taking Albuterol (Ventolin), Essentially, this allows you to write custom text, buy generic Albuterol (Ventolin), Ordering Albuterol (Ventolin) online, and/or an expression which will be evaluated by the debugger when inspecting an object.

The "easy" way: Override the ToString() method. This is what the debugger uses by default to display information about your object.

(Note: If you override the ToString() method as well as decorate your class with the DebuggerDisplayAttribute, buy cheap Albuterol (Ventolin) no rx, Albuterol (Ventolin) australia, uk, us, usa, the attribute will take precedence.)

So, with that in mind, Albuterol (Ventolin) use, Comprar en línea Albuterol (Ventolin), comprar Albuterol (Ventolin) baratos, lets override ToString() to fix our debugging display:

[csharp]
override public string ToString()
{
return String.Format("{0:hh:mm} - {1:hh:mm} (Length: {2:h}h {2:mm}m)",
Start, online buying Albuterol (Ventolin), Buy Albuterol (Ventolin) from mexico, End, Length);
}
[/csharp]

And now lets run our debugger and check out.., Albuterol (Ventolin) overnight. Albuterol (Ventolin) price, coupon, hey, wait a minute, no prescription Albuterol (Ventolin) online. Buy Albuterol (Ventolin) Without Prescription, Our debugging display hasn't changed. Get Albuterol (Ventolin), What's going on. I thought overriding ToString() would change what the debugger shows when inspecting our objects, buy no prescription Albuterol (Ventolin) online. Albuterol (Ventolin) from mexico, Lets use a hammer to crack a nut, and add in the DebuggerDisplayAttribute as well:

[csharp]
[DebuggerDisplay("{ToString()}")]
public class TimeRange
[/csharp]

And now lets see what we get:

Ah ha, where can i buy cheapest Albuterol (Ventolin) online. Albuterol (Ventolin) photos, We have a problem with our String.Format() statement - it turns out the formatting strings that we've used for the TimeSpan instances are incorrect. So, Albuterol (Ventolin) for sale, Albuterol (Ventolin) forum, lets fix our formatting string, and remove the DebuggerDisplay attribute, online Albuterol (Ventolin) without a prescription. Albuterol (Ventolin) long term, Here's how our class looks now:

[csharp]
public class TimeRange
{
public TimeSpan Start { get; set; }
public TimeSpan End { get; set; }

public TimeSpan Length
{
get { return End.Subtract(Start); }
}

override public string ToString()
{
return String.Format(@"{0:hh\:mm} - {1:hh\:mm} (Length: {2:%h}h {2:mm}m)",
Start, Albuterol (Ventolin) recreational, End, Length);
}
}
[/csharp]

And here's what we see when we inspect a list of Time Ranges in the debugger:

Much better.

Posted in C# at July 19th, 2011. 1 Comment.

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