Misc

The New C# 6.0 Language Features Explained

Misc, Software, Web

I am a professional and passionate software developer and have been using the Microsoft :NET platform for more than a decade now.

A few months ago the new C# compiler was released which supports the new language version C# 6.0.

The following video which I recorded “wiff ze German English accent” I explain some of the new syntax features.

Below the video on Youtube – but here as well – you’ll find the time indices at which a new feature begins:


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Yield return & using IDisposable

Misc, Software

Deutsche Version

“Yield return” is a powerful and handy statement if you want to quickly and easily an iteratable list without creating an Array or a List first:

using System;
using System.Collections.Generic;
using System.Drawing;

class Program
{
    static void Main()
    {
        var colors = Rainbow;

        Console.WriteLine("colors.GetType(): {0}", colors.GetType());
        Console.WriteLine();

        foreach (Color color in colors)
        {
            Console.WriteLine(color.Name);
        }

        Console.ReadLine();
    }

    static IEnumerable<Color> Rainbow
    {
        get
        {
            yield return (Color.Red);
            yield return (Color.Orange);
            yield return (Color.Yellow);
            yield return (Color.Green);
            yield return (Color.LightBlue);
            yield return (Color.Indigo);
            yield return (Color.Violet);
        }
    }
}

Red
Orange
Yellow
Green
LightBlue
Indigo
Violet

The .NET compiler then creates the necessary IEnumerable- and IEnumerator-implementing classes and the state machine in the background and everything is fine and clear.
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Linq: Split()

Misc, Software

Deutsche Version

Terminator T1000

So you know the Cinderella saying “The good ones go into the pot, the bad ones go into your crop.”?

Well, .NET Linq does have a solution for either one, it’s called Where(). If you use that, your solution probably looks like this:

var evens = list.Where(number => ((number % 2) == 0));
var odds =  list.Where(number => ((number % 2) != 0));

But it does not have a solution for both. So I wrote myself one:

public static void Split<T>(this IEnumerable<T> source
    , Func<T, Boolean> predicate
    , out IEnumerable<T> trueList
    , out IEnumerable<T> falseList)
{
    trueList = source.Where(predicate);
    falseList = source.Except(trueList);
}

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WPF: MVVM & Responsive UI

Misc, Software

Deutsche Version

A few days ago I wrote about my first tumbling steps into the world of WPF & MVVM.

Now a friend of mine – who’s been working in that very field – has challlenged me:

a) My GUI should remain responsive while the merge is being executed.

b) I should not re-evaluate the entire GUi after every single user action.

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