Javascript, CSS - Javascript transitions.

Cool Javascript transitions
http://animejs.com/

Visual Studio hangs - Touch Screen bug Cause and fix

This is a known issue that will be addressed in an upcoming Windows Update.

Until the fix is available, to work around this issue, turn off all pen and touch support for Visual Studio. To do this,

1. Find the devenv.exe.config file. It is located in the folder <VS Install Location>\Common7\IDE.
2. Copy devenv.exe.config to a non-protected folder, for example your Documents folder, and then create a backup copy of devenv.exe.config.
3. Open devenv.exe.config, and modify the <AppContextSwitchOverrides> element to add “Switch.System.Windows.Input.Stylus.DisableStylusAndTouchSupport=true”
   • For example

     • <AppContextSwitchOverrides value="Switch.System.Threading.ThrowExceptionIfDisposedCancellationTokenSource=false;Switch.System.Windows.Forms.DoNotSupportSelectAllShortcutInMultilineTextBox=false;Switch.System.Windows.Input.Stylus.DisableStylusAndTouchSupport=true" />

4. Copy the edited devenv.exe.config into <VS Install Location>\Common7\IDE.

Once the update to .NET Framework 4.7 is available, remove this property from the “value” string to restore pen and touch input to Visual Studio.

NOTE: because this file is replaced with each update to Visual Studio, you must re-apply this workaround after updating Visual Studio until the update to .NET Framework 4.7 is available.

C# - Implement Generic IEnumerable in Simple Example

class MyList<T> : IEnumerable<T>
{
    T[] m_Items = null;
    int freeIndex = 0;

    public MyList()
    {
        // For the sake of simplicity lets keep them as arrays
        // ideally it should be link list
        m_Items = new T[100];
    }

    public void Add(T item)
    {
        // Let us only worry about adding the item 
        m_Items[freeIndex] = item;
        freeIndex++;
    }

    #region IEnumerable<T> Members

    public IEnumerator<T> GetEnumerator()
    {
        foreach (T t in m_Items)
        {
            // Lets check for end of list (its bad code since we used arrays)
            if (t == null) // this wont work is T is not a nullable type
            {
                break;
            }

            // Return the current element and then on next function call 
            // resume from next element rather than starting all over again;
            yield return t;
        }
    }

    #endregion

    #region IEnumerable Members

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
        // Lets call the generic version here
        return this.GetEnumerator();
    }

    #endregion
}

Use it:

MyList<string> myListOfStrings = new MyList<string>();

    myListOfStrings.Add("one");
    myListOfStrings.Add("two");
    myListOfStrings.Add("three");
    myListOfStrings.Add("four");

    foreach (string s in myListOfStrings)
    {
        Console.WriteLine(s);
    }

C# - Return and Yield differences

static int SimpleReturn()
{
    return 1;
    return 2;
    return 3;
}

static void Main(string[] args)
{
    // Lets see how simeple return works
    Console.WriteLine(SimpleReturn());
    Console.WriteLine(SimpleReturn());
    Console.WriteLine(SimpleReturn());
    Console.WriteLine(SimpleReturn());
}

The reason for this is that the normal return statement does not preserve the state of the function while returning. i.e. every call to this function is a new call and it will return the first value only.

-----------------------------------------------------------------------------------------------------------------------

Where as if I replace the return keyword by yield return then the function will become capable of saving its state while returning the value. i.e. when the function is called second time, it will continue the processing from where is has returned in the previous call.

static IEnumerable<int> YieldReturn()
{
    yield return 1;
    yield return 2;
    yield return 3;
}
static void Main(string[] args)
{
    // Lets see how yield return works
    foreach (int i in YieldReturn())
    {
        Console.WriteLine(i);
    }
}

Razor - Verbatim String in Razor Example

@(SiteSettings.SettingsPage.Debug == true ? @"data-debug=""true""" :  @"data-debug=""false""")

Javascript, jQuery - Toggle Between Two Functions

let Partner = {

init() {

const $ = require('jquery');

var $selector = 11;

var $link = document.querySelector('[data-clickme]');

var $list = $('.partnerblock__grid a');

var $listSize = $('.partnerblock__grid a:visible').length;

hideListVisibility($, $list, $selector);

$($link).on('click', function(e) {

e.preventDefault();

if ($(this).attr('data-click-state') == 1) {

$(this).attr('data-click-state', 0)

hideListVisibility($, $list, 11);

} else {

$(this).attr('data-click-state', 1)

showListVisibility($, $list, 48);

}

})

}

};

function hideListVisibility($, $list, $selector) {

$($list).each(function() {

var $elem = $(this);

if ($elem.index() > $selector) {

$elem.addClass("hide");

};

});

}

function showListVisibility($, $list, $selector) {

$($list).each(function() {

var $elem = $(this);

if ($elem.index() < $selector) {

$elem.removeClass("hide");

};

});

}

export default Partner;

Episerver - Simple Properties Rendering Reminder with PropertyFor