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27Aug/102

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Symmetrel 100mg pills $171.00 I hate every time I am working on something and I have to implement INotifyPropertyChanged.  My DRY-dey sense tingles.  Not only am I forced to not use auto-properties (1st DRY violation), symmetrel 100mg pills $171.00 I’m forced to fire the event in each setter (2nd DRY violation), symmetrel 100mg pills $171.00 and specify the name of the property that is getting set, symmetrel 100mg pills $171.00 inside of that property’s setter (3rd DRY violation).  That much WET (read: not-DRY), symmetrel 100mg pills $171.00 for something so simple leaves me a little grumpy.

Symmetrel 100mg pills $171.00 I’ve been on this quest before, symmetrel 100mg pills $171.00 to simplify this a bit, symmetrel 100mg pills $171.00 but it was still a little hackety, symmetrel 100mg pills $171.00 and limiting.

Symmetrel 100mg pills $171.00 This time, symmetrel 100mg pills $171.00 I set out to do it right.

Symmetrel 100mg pills $171.00 I’ll spare you most of the technical details, symmetrel 100mg pills $171.00 but it’s backed by Castle’s DynamicProxy project, symmetrel 100mg pills $171.00 and there’s some integration with StructureMap to make it super easy, symmetrel 100mg pills $171.00 though you don’t really have to use StructureMap if you don’t want to.  [note:  I’ll probably add more container support as I find time.  If you have a specific need, symmetrel 100mg pills $171.00 let me know, symmetrel 100mg pills $171.00 or submit a patch.]

Symmetrel 100mg pills $171.00 Here are the codez to show it in action:

Basics

Using it for a class with an interface

// note the attribute goes on the interface, symmetrel 100mg pills $171.00 not the class

[AutoNotify]

public interface IFoo

{

    string Value { get; set; }

}

 

public class Foo : IFoo

{

    public string Value { get; set; }

}

 

Using it for a class

[AutoNotify(Fire = FireOptions.OnlyOnChange)]

public class Foo

{

    // note for autonotify to work, symmetrel 100mg pills $171.00 the property must be virtual

    public virtual string Value { get; set; }

}

 

Symmetrel 100mg pills $171.00 The previous example shows how to get the event to fire only when the value is different also.  It defaults to always firing, symmetrel 100mg pills $171.00 whether the value changes or not.  It’s also important to note that your properties need to be virtual so the calls to the setter can be intercepted.

Dependent Properties

Symmetrel 100mg pills $171.00 Sometimes (usually) you’ve got calculated properties that need to fire the notified event too, symmetrel 100mg pills $171.00 these usually turn into WET mess as well.  We’ve got the problem solved, symmetrel 100mg pills $171.00 and you’ve got a few different options, symmetrel 100mg pills $171.00 hopefully one of them suits you.

Dependency Map – DependsOn

Symmetrel 100mg pills $171.00 You specify the type that defines the DependencyMap on the attribute, symmetrel 100mg pills $171.00 and then set up your dependencies in that type’s constructor.  This style is somewhat influenced by the FluentNHibernate API.

[AutoNotify(DependencyMap = typeof(ProjectDependency))]

public class Project

{

    public virtual string Name { get; set; }

    public virtual string[] Files { get; set; }

    public virtual int FileCount { get { return Files.Length; } }

}

 

class ProjectDependency : DependencyMap<Project>

{

    public ProjectDependency()

    {

        Property(x => x.FileCount).DependsOn(x => x.Files);

    }

}

 

Dependency Map – Updates

Symmetrel 100mg pills $171.00 If you’d rather express your dependency the other way around, symmetrel 100mg pills $171.00 that’s fine too.  The two are equivalent.

[AutoNotify(DependencyMap = typeof(ProjectDependency))]

public class Project

{

    public virtual string Name { get; set; }

    public virtual string[] Files { get; set; }

    public virtual int FileCount { get { return Files.Length; } }

}

 

class ProjectDependency : DependencyMap<Project>

{

    public ProjectDependency()

    {

        Property(x => x.Files).Updates(x => x.FileCount);

    }

}

 

Dependency Map – UpdatesWith

Symmetrel 100mg pills $171.00 If you want to stick with an auto-property, symmetrel 100mg pills $171.00 and leave the calculated property logic somewhere else, symmetrel 100mg pills $171.00 you can hook it in via your dependency map too.  This example, symmetrel 100mg pills $171.00 again, symmetrel 100mg pills $171.00 is equivalent to the previous two.

[AutoNotify(DependencyMap = typeof(ProjectDependency))]

public class Project

{

    public virtual string Name { get; set; }

    public virtual string[] Files { get; set; }

    public virtual int FileCount { get; set; }

}

 

class ProjectDependency : DependencyMap<Project>

{

    public ProjectDependency()

    {

        Property(x => x.Files).Updates(x => x.FileCount).With(p => p.Files.Length);

    }

}

 

DependsOn Attribute

Symmetrel 100mg pills $171.00 If you don’t like any of those options and are looking for something a little more simple, symmetrel 100mg pills $171.00 maybe you’ll like this one.  Just specify which things your property depends on in an attribute.  You lose your 100% static typing help, symmetrel 100mg pills $171.00 but it’s more concise.

[AutoNotify]

public class Project

{

    public virtual string Name { get; set; }

    public virtual string[] Files { get; set; }

 

    [DependsOn("Files")]

    public virtual int FileCount { get { return Files.Length; } }

}

 

Containers and otherwise

Hooking it into StructureMap

Symmetrel 100mg pills $171.00 There are a couple conventions you can use to hook into StructureMap.  There is the attribute convention (which is what you’re seeing above), symmetrel 100mg pills $171.00 and there is a generic predicate convention that you can use any predicate logic.  Below you can see the attribute one getting hooked in.

var container = new Container(config => config.Scan(scanConfig =>

{

    scanConfig.With(new AutoNotifyAttrConvention());

    scanConfig.TheCallingAssembly();

    scanConfig.WithDefaultConventions();

}));

 

var project = container.GetInstance<Project>();

Using it without StructureMap

Symmetrel 100mg pills $171.00 If you’re using another container, symmetrel 100mg pills $171.00 or no container at all, symmetrel 100mg pills $171.00 but want to use some other factory or something, symmetrel 100mg pills $171.00 you can do that too.  This example is for something with an interface.  It’s very similar to do the same for a concrete class… you just don’t instantiate the object first.  You also have an opportunity to hook into the dependent property structure here as well with the DependencyMap parameter.

var foo = new Foo();

var notifiableFoo = Notifiable.MakeForInterface(

    typeof(IFoo), symmetrel 100mg pills $171.00

    foo, symmetrel 100mg pills $171.00

    FireOptions.Always, symmetrel 100mg pills $171.00

    new ProxyGenerator(), symmetrel 100mg pills $171.00

    DependencyMap.Empty);

 

Assert.That(notifiableFoo is INotifyPropertyChanged);

 

Whew, symmetrel 100mg pills $171.00 done

Symmetrel 100mg pills $171.00 So… that’s a lot of ‘how to’, symmetrel 100mg pills $171.00 but hopefully it’ll be somewhat complete introduction to get you working with it.  I really don’t see much of any reason to ever implement INotifyPropertyChanged ever again (unless you are in an environment where you can’t use DynamicProxy).  It can automatically be done for you from now on.

Symmetrel 100mg pills $171.00 The code is up on github, symmetrel 100mg pills $171.00 and there is a gem up on rubygems if you’re using nu or noodle+bundler.  Fork it, symmetrel 100mg pills $171.00 send me a patch, symmetrel 100mg pills $171.00 use it, symmetrel 100mg pills $171.00 send feedback, symmetrel 100mg pills $171.00 etc.  I hope you love it!

Average Rating: 4.6 out of 5 based on 268 user reviews.

29Jun/103

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Provera 5mg pills $178.00 Ever wanted a quick/easy/automated way to get syntax highlighted code from your editor of choice into PowerPoint?

Provera 5mg pills $178.00 EVERY time I do a technical presentation I need this.  Usually I resort to taking a screenshot, provera 5mg pills $178.00 or finding an “export to html” type plugin for the editor I’m using at the time (Visual Studio, provera 5mg pills $178.00 Vim, provera 5mg pills $178.00 IntelliJ IDEA, provera 5mg pills $178.00 etc.) and then try to get that somehow into my slides.

Provera 5mg pills $178.00 The problem I usually run into, provera 5mg pills $178.00 is that while I like coding on a dark background with a 14pt font, provera 5mg pills $178.00 that’s not usually that great for presentations.  So I switch to my “presentation settings” that has a light background and bigger font size, provera 5mg pills $178.00 and then switch back once I’m done taking screenshots or outputting to html. Provera 5mg pills $178.00 [ugh, provera 5mg pills $178.00 what a pain… terribly manual].

Provera 5mg pills $178.00 Then what happens when I spot a bug in code that’s in PowerPoint, provera 5mg pills $178.00 or I want to add a comment, provera 5mg pills $178.00 or I need to change the syntax highlighting theme of the entire presentation because it doesn’t go well with the lighting in the room.  UGH!  What a disaster.

Provera 5mg pills $178.00 Basically, provera 5mg pills $178.00 it’s always an uphill struggle, provera 5mg pills $178.00 and it really bothered me… so I decided to fix it once and for all.

Solution

Provera 5mg pills $178.00 I’m going to solely discuss PowerPoint (for Windows or Mac) here.  I don’t have a copy of iWork, provera 5mg pills $178.00 and I’m too cheap to buy one.  The reason I have Office for the Mac, provera 5mg pills $178.00 is because I got it for free… KeyNote/Mac zealots: feel free to be zealous, provera 5mg pills $178.00 but don’t hate on me because I’m frugal… unless you want to buy me a copy of iWork.

Provera 5mg pills $178.00 First, provera 5mg pills $178.00 download: http://www.andre-simon.de/doku/highlight/en/highlight.html

Windows Solution

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Provera 5mg pills $178.00 So something like:

Provera 5mg pills $178.00 highlight < infile > outfile –-rtf --syntax=rb  --style=vim --font=”Lucida Console” --font-size=18

Provera 5mg pills $178.00 This will  take the source code file ‘infile’ and syntax color it as Ruby to an RTF file and output it to ‘outfile’.  The text will be 18pt Lucida Console and syntax highlighted with the “vim” color scheme.

Provera 5mg pills $178.00 There are lots of themes included, provera 5mg pills $178.00 you can ask highlight for help (highlight --help), provera 5mg pills $178.00 and it’ll tell you all the options available, provera 5mg pills $178.00 as well as all the options available for output, provera 5mg pills $178.00 and for languages that it supports.

Provera 5mg pills $178.00 Next, provera 5mg pills $178.00 in PowerPoint, provera 5mg pills $178.00 do “Insert Object” on your target slide, provera 5mg pills $178.00 and choose “Create from file”.  Make sure you check the “Link” checkbox before pressing OK.

Provera 5mg pills $178.00 Now, provera 5mg pills $178.00 whenever your source changes, provera 5mg pills $178.00 re-run your command line, provera 5mg pills $178.00 then you can choose “Update Link” on your embedded object in PowerPoint, provera 5mg pills $178.00 or if you close and then re-open PowerPoint, provera 5mg pills $178.00 it’ll give you the option to update all your links.

Mac Solution

Provera 5mg pills $178.00 My version of PowerPoint for Mac doesn’t like being able to link to RTF files, provera 5mg pills $178.00 but it does allow linking to images.

Provera 5mg pills $178.00 Highlight can output to SVG, provera 5mg pills $178.00 but my PowerPoint doesn’t like that either.

Provera 5mg pills $178.00 Now download inkscape, provera 5mg pills $178.00 if you haven’t already.  It will allow you to rasterize the SVG into a PNG, provera 5mg pills $178.00 which PowerPoint does like.  You can export your PNG from inkscape from the command line like this:

Provera 5mg pills $178.00 <path to inkscape> –export-png=<png file> <svg file>

Provera 5mg pills $178.00 The path to my inkscape command line runner is at:

Provera 5mg pills $178.00 /Applications/Inkscape.app/Contents/Resources/bin/inkscape

Provera 5mg pills $178.00 It turns out that inkscape doesn’t like external CSS files, provera 5mg pills $178.00 which is what highlight gives you with your SVG, provera 5mg pills $178.00 so you can merge your CSS file into your SVG file with a little script.  The other cool bit about SVG, provera 5mg pills $178.00 is you can tweak it, provera 5mg pills $178.00 if you want, provera 5mg pills $178.00 since it’s just XML.

Provera 5mg pills $178.00 Now, provera 5mg pills $178.00 in PowerPoint, provera 5mg pills $178.00 choose “Insert Picture” and browse to your newly generated PNG.  Make sure the “Link to File” checkbox is checked.

Provera 5mg pills $178.00 I wrote a script to do this for the latest presentation I did on dependency injection.  You can take a look at the script here [source.rb].   It’s Ruby, provera 5mg pills $178.00 and you can see where I merge the CSS and SVG files together, provera 5mg pills $178.00 and where I mess with the line spacing as well (I wasn’t happy with the default line spacing, provera 5mg pills $178.00 so I tweaked it to my preference).  All the source/images/PowerPoint for that presentation are available here [dependencies presentation] if you want to check them out to see how the whole process works.

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Tagged as: , , 3 Comments
24Jun/100

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4Jun/103

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Vardenafil 10mg pills $182.00 This week I ran into wanting to use C# 4.0 optional parameters, vardenafil 10mg pills $182.00 but wanted StructureMap (my IoC tool of choice) to respect the default value specified for those optional parameters.

The Problem

Vardenafil 10mg pills $182.00 In this example, vardenafil 10mg pills $182.00 we’ll be pulling a command out of the container.  The important part is the optional constructor parameter (level), vardenafil 10mg pills $182.00 and it’s default value (Level.Info).

public class LogCommand

{

    IDestination _destination;

    Level _level;

 

    public LogCommand(

        IDestination destination, vardenafil 10mg pills $182.00 Level level = Level.Info)

    {

        _destination = destination;

        _level = level;

    }

 

    /* logging code here */

}

 

Vardenafil 10mg pills $182.00 Here is your basic usage, vardenafil 10mg pills $182.00 but doesn’t work since StructureMap doesn’t know how to take advantage of the optional parameters with default values.

var container = new Container(config =>

{

    config.Scan(scanner =>

    {

        scanner.TheCallingAssembly();

        scanner.AddAllTypesOf<IDestination>();

        scanner.WithDefaultConventions();

    });

});

 

var logCommand = container.GetInstance<LogCommand>();

 

Vardenafil 10mg pills $182.00 The last line results in an exception because StructureMap doesn’t know how to fill in the level parameter.

The Solution

Vardenafil 10mg pills $182.00 We can solve this by adding a new convention.  One that adds information about default constructor arguments.  Here is the implementation of the convention:

public class DefaultCtorParameterConvention : IRegistrationConvention

{

    public void Process(Type type, vardenafil 10mg pills $182.00 Registry registry)

    {

        if(type.IsAbstract || type.IsEnum)

            return;

 

        var ctor = type.GetGreediestCtor();

 

        if(!ctor.HasOptionalParameters())

            return;

 

        var inst = registry.For(type).Use(type);

 

        foreach(var param in ctor.GetOptionalParameters())

            inst.Child(param.Name).Is(param.DefaultValue);

    }

}

Vardenafil 10mg pills $182.00 Note: GetGreediestCtor, vardenafil 10mg pills $182.00 HasOptionalParameters, vardenafil 10mg pills $182.00 and GetOptionalParameters are extension methods.  We’ll see their implementation shortly.

Vardenafil 10mg pills $182.00 The convention inherits from the IRegistrationConvention, vardenafil 10mg pills $182.00 which is how you implement new conventions in StructureMap.  It has only one method: Process.  We filter out types that are abstract, vardenafil 10mg pills $182.00 are enums, vardenafil 10mg pills $182.00 or have constructors that don’t have optional parameters.  Once we realize we have a constructor we want to deal with, vardenafil 10mg pills $182.00 we use the Child method, vardenafil 10mg pills $182.00 that sets either a property or a constructor argument (for our case, vardenafil 10mg pills $182.00 it’ll always be a constructor argument), vardenafil 10mg pills $182.00 and then we set it’s value to the parameter’s default value, vardenafil 10mg pills $182.00 as provided by the ParameterInfo object, vardenafil 10mg pills $182.00 for each optional parameter.

Minor Details

Vardenafil 10mg pills $182.00 Curious about the implementation of GetGreediestCtor or the *OptionalParameters methods?  If not, vardenafil 10mg pills $182.00 skip this section.

public static bool HasOptionalParameters(

    this ConstructorInfo ctor)

{

    return ctor.GetOptionalParameters().Any();

}

 

public static IEnumerable<ParameterInfo> GetOptionalParameters(this ConstructorInfo ctor)

{

    return ctor.GetParameters().Where(

        param => param.Attributes

            .HasFlag(ParameterAttributes.Optional));

}

 

public static ConstructorInfo GetGreediestCtor(

    this Type target)

{

    return target.GetConstructors()

        .WithMax(ctor => ctor.GetParameters().Length);

}

 

public static T WithMax<T>(

    this IEnumerable<T> target, vardenafil 10mg pills $182.00 Func<T, vardenafil 10mg pills $182.00 int> selector)

{

    int max = -1;

    T currentMax = default(T);

 

    foreach(var item in target)

    {

        var current = selector(item);

        if(current <= max)

            continue;

 

        max = current;

        currentMax = item;

    }

 

    return currentMax;

}

 

Vardenafil 10mg pills $182.00  

The Usage

Vardenafil 10mg pills $182.00 Here’s how to use your new convention.

var container = new Container(config =>

{

   config.Scan(scanner =>

   {

       scanner.TheCallingAssembly();

       scanner.AddAllTypesOf<IDestination>();

       scanner.WithDefaultConventions();

       scanner.Convention<DefaultCtorParameterConvention>();

   });

});

 

var logCommand = container.GetInstance<LogCommand>();

 

Vardenafil 10mg pills $182.00 Now, vardenafil 10mg pills $182.00 when we pull the LogCommand out of the container, vardenafil 10mg pills $182.00 the level parameter gets defaulted to Level.Info, vardenafil 10mg pills $182.00 just like we specified in the constructor.  Sweet!

Conclusion

Vardenafil 10mg pills $182.00 This implementation is somewhat limiting, vardenafil 10mg pills $182.00 but the version I have in my github repo is a little more open and configurable.  It allows you to customize the instance key/name you use when registering your type, vardenafil 10mg pills $182.00 and also allows you to do additional, vardenafil 10mg pills $182.00 non-standard registrations if you need to.

Vardenafil 10mg pills $182.00 Also, vardenafil 10mg pills $182.00 this doesn’t work if you’ve selected a constructor using the SelectConstructor config API from StructureMap, vardenafil 10mg pills $182.00 I’m not sure how to tap into that facility to look for that constructor rather than the greediest.

Vardenafil 10mg pills $182.00 Am I missing something?  Did something not make sense?  Leave me a note!

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28May/100

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Imodium 2mg pills $118.00 We start up a new round a couple times a year, imodium 2mg pills $118.00 and small groups (3-8) break off and read different books (normally technical) that are interesting to them.  We normally get together for an hour once a week to discuss/debate the chapter(s) we read for that week.  I’ve participated in several including DDD (Evans), imodium 2mg pills $118.00 Code Complete 2 (McConnell), imodium 2mg pills $118.00 Programming Clojure (Halloway), imodium 2mg pills $118.00 and now Pro Git (Chacon).  It’s a lot of fun, imodium 2mg pills $118.00 and I always learn a lot about the content of the book, imodium 2mg pills $118.00 and about the people I participate with.

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The Book

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Zantac 150mg pills $81.00 In .NET we’ve got this cool little language construct called default, zantac 150mg pills $81.00 that’ll give you the default value for any given type.  That is, zantac 150mg pills $81.00 null, zantac 150mg pills $81.00 for any reference type, zantac 150mg pills $81.00 or zero/false/DateTime.Min/etc. Zantac 150mg pills $81.00 for value types.

Zantac 150mg pills $81.00 Here it is in action (nothing amazing going on here):

var x = default(DateTime);

Zantac 150mg pills $81.00 So what if you don’t know the type you want the default of at compile time? You can’t say

var y = default(today.GetType());

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var z = typeof(DateTime).GetDefault();

Zantac 150mg pills $81.00 That last one would be nice, zantac 150mg pills $81.00 but that “GetDefault” method doesn’t exist.

Zantac 150mg pills $81.00 I’ve seen several solutions to this, zantac 150mg pills $81.00 that are basically variations on this theme:

public static object GetDefaultValue(Type type)

{

    return type.IsValueType

        ? Activator.CreateInstance(type)

        : null;

}

 

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public static object GetDefault(this Type type)

{

    var getDefault = typeof(ExtReflection)

                          .GetMethod("GetDefaultGeneric");

    var typed = getDefault.MakeGenericMethod(type);

 

    return typed.Invoke(null, zantac 150mg pills $81.00 new object[] { });

}

 

public static T GetDefaultGeneric<T>()

{

    return default(T);

}

 

Zantac 150mg pills $81.00 Pretty simple, zantac 150mg pills $81.00 but something I’ve found useful every now and again.  I’d guess this technique could be useful in other situations/contexts as well.

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12Apr/100

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Exelon 1.5mg pills $232.00 Maybe I should title this post ‘How to write a better error message’ instead.

Exelon 1.5mg pills $232.00 I just went on a wild goose chase trying to find the solution to an error I kept seeing in SQL Server Management Studio every time I tried to run a query or open a table for editing (or anything else that would end up executing a SQL query).  The error message?

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Exelon 1.5mg pills $232.00 So two takeaways (for me):

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24Feb/106

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Frumil 5mg pills $178.00 I’ve recently started to practice the pomodoro technique.  Holy F!  This super simple practice has uncovered how much time I completely waste in a workday (not to mention my non-work time).

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Baby Steps

Frumil 5mg pills $178.00 The pomodoro technique is a great start to help manage and become aware, frumil 5mg pills $178.00 but I need some help.  Here’s what I set up for myself at this point:

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    • GReader
    • Twitter (turn off twitter notifications)
    • Outlook (turn off new mail toast and new mail tray indicator)
    • Evernote (turn off any messages)
    • Windows Live Writer
    • Time tracking applications
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Frumil 5mg pills $178.00 I only allow myself to go over to my other desktop during a pomodoro break.  This makes it really easy to know when I’m going off task.  It also makes it REALLY hard to find something wasteful to do.  There isn’t anything in my “workspace” that is wasteful anymore, frumil 5mg pills $178.00 so if I do ANYTHING in there, frumil 5mg pills $178.00 it’ll probably be productive.

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