Use the [`IsEnum`][1] property:

    if(objectType.IsEnum) {
        return true;
    }


  [1]: http://msdn.microsoft.com/en-us/library/system.type.isenum.aspx

[Type.IsEnum][1] is what your are looking for


  [1]: http://msdn.microsoft.com/en-us/library/system.type.isenum.aspx

I completely misinterpreted the question by focusing too much on the [Description], so in case you ever want to check whether a particular enum has a [description] attribute or not ( in case json throws a fit when there is none ), this is one possible way to check for that:

    public override bool CanConvert(Type objectType)
    {
        FieldInfo[] fieldInfo = objectType.GetFields(BindingFlags.Public | BindingFlags.Static);

        if( fieldInfo.Length &gt; 0 )
        {
            return ( fieldInfo[0].GetCustomAttributes(typeof(DescriptionAttribute),false).Length &gt; 0 );
        }
        else
        {
            return false;
        }
    }



I&#39;m using jQuery, and I have a textarea. When I submit by my button I will alert each text separated by newline. 
How to split my text when there is a newline?

      var ks = $(&#39;#keywords&#39;).val().split(&quot;\n&quot;);
      (function($){
         $(document).ready(function(){
            $(&#39;#data&#39;).submit(function(e){
               e.preventDefault();
               alert(ks[0]);
               $.each(ks, function(k){
                  alert(k);
               });
            });
         });
      })(jQuery);

example input :

    Hello
    There

Result I want is :

    alert(Hello); and
    alert(There)

How to split newline

 1. I&#39;m using a WordPress site.
 2. I&#39;m including this script in the header.

When the script loads, I get this error:

&gt; TypeError: &#39;undefined&#39; is not a function (evaluating &#39;$(document)&#39;)

I have no idea what is causing it or what it even means.

In firebug, I get this:

&gt; $ is not a function

TypeError: &#39;undefined&#39; is not a function (evaluating &#39;$(document)&#39;)

I am writing a JsonConverter for Json.NET which should allow me to convert any enum&#39;s to a string value defined by a [Description] attribute.

For example:


    public enum MyEnum {
        [Description(&quot;Sunday&quot;)] Sunday,
        [Description(&quot;Monday&quot;)] Monday,
        [Description(&quot;Tuesday&quot;)] Tuesday,
        [Description(&quot;Wednesday&quot;)] Wednesday,
        [Description(&quot;Thursday&quot;)] Thursday,
        [Description(&quot;Friday&quot;)] Friday,
        [Description(&quot;Saturday&quot;)] Saturday
    }

I already have the code for supporting `myEnum.Description()` which will obviously return its string description.

In the JsonConverter implementation, there is this method:

        public override bool CanConvert(Type objectType)
        {

        }

I am trying to figure out how to determine if `objectType` is an `Enum` and return true so that the converter knows it can convert this object.  Since I have many `Enum`&#39;s, I cannot explicitly check each one so I was hoping for a more generic way of accomplishing this.

Check if a given Type is an Enum

I am writing a JsonConverter for Json.NET which should allow me to convert any enum's to a string value defined by a [Description] attribute.
For example:
<pre><code class="hljs language-csharp">public enum MyEnum {
 [Description("Sunday")] Sunday,
 [Description("Monday")] Monday,
 [Description("Tuesday")] Tuesday,
 [Description("Wednesday")] Wednesday,
 [Description("Thursday")] Thursday,
 [Description("Friday")] Friday,
 [Description("Saturday")] Saturday
}
</code></pre>
I already have the code for supporting <code>myEnum.Description()</code> which will obviously return its string description.
In the JsonConverter implementation, there is this method:
<pre><code class="hljs language-arduino"> public override bool CanConvert(Type objectType)
 {

 }
</code></pre>
I am trying to figure out how to determine if <code>objectType</code> is an <code>Enum</code> and return true so that the converter knows it can convert this object. Since I have many <code>Enum</code>'s, I cannot explicitly check each one so I was hoping for a more generic way of accomplishing this.

I have a program that is essentially like a paint application. However, my program has some flickering issues. I have the following line in my code (which should get rid of flickering - but doesn&#39;t): 

    this.SetStyle(ControlStyles.AllPaintingInWmPaint 
    | ControlStyles.UserPaint | ControlStyles.DoubleBuffer, true);

my code(minus the super and sub classes for the shapes is as follows:

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;

    namespace Paint
    {
        public partial class Paint : Form
        {
            private Point startPoint;
            private Point endPoint;
            private Rectangle rect = new Rectangle();
            private Int32 brushThickness = 0;
            private Boolean drawSPaint = false;
            private List&lt;Shapes&gt; listOfShapes = new List&lt;Shapes&gt;();
            private Color currentColor;
            private Color currentBoarderColor;
            private Boolean IsShapeRectangle = false;
            private Boolean IsShapeCircle = false;
            private Boolean IsShapeLine = false;
    
            public SPaint()
            {
                
                InitializeComponent();
                this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.DoubleBuffer, true);
                
                currentColor = Color.Red;
                currentBoarderColor = Color.DodgerBlue;
                IsShapeRectangle = true; 
            }
    
            private void panelArea_Paint(object sender, PaintEventArgs e)
            {
                Graphics g = panelArea.CreateGraphics();
    
                if (drawSPaint == true)
                {
                    
                    Pen p = new Pen(Color.Blue);
                    p.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
    
                    if (IsShapeRectangle == true)
                    {
                        g.DrawRectangle(p, rect);
                    }
                    else if (IsShapeCircle == true)
                    {
                        g.DrawEllipse(p, rect);
                    }
                    else if (IsShapeLine == true)
                    {
                        g.DrawLine(p, startPoint, endPoint);
                    }
                }
                foreach (Shapes shape in listOfShapes)
                {
                   
                    shape.Draw(g);
    
                }
            }
    
            private void panelArea_MouseDown(object sender, MouseEventArgs e)
            {
               
                startPoint.X = e.X;
                startPoint.Y = e.Y;
    
                drawSPaint = true;
            }
    
            private void panelArea_MouseMove(object sender, MouseEventArgs e)
            {
                
    
                if (e.Button == System.Windows.Forms.MouseButtons.Left)
                {
    
                    if (e.X &gt; startPoint.X)
                    {
                        rect.X = startPoint.X;
                        rect.Width = e.X - startPoint.X;
                    }
                    else
                    {
                        rect.X = e.X;
                        rect.Width = startPoint.X - e.X;
                    }
                    if (e.Y &gt; startPoint.Y)
                    {
                        rect.Y = startPoint.Y;
                        rect.Height = e.Y - startPoint.Y;
                    }
                    else
                    {
                        rect.Y = e.Y;
                        rect.Height = startPoint.Y - e.Y;
                    }
    
    
                    panelArea.Invalidate();
    
                }
    
            }
    
            private void panelArea_MouseUp(object sender, MouseEventArgs e)
            {
               
                endPoint.X = e.X;
                endPoint.Y = e.Y;
    
                drawSPaint = false;
    
                if (rect.Width &gt; 0 &amp;&amp; rect.Height &gt; 0)
                {
                    if (IsShapeRectangle == true)
                    {
                        listOfShapes.Add(new TheRectangles(rect, currentColor, currentBoarderColor, brushThickness));
                    }
                    else if (IsShapeCircle == true)
                    {
                        listOfShapes.Add(new TheCircles(rect, currentColor, currentBoarderColor, brushThickness));
                    }
                    else if (IsShapeLine == true)
                    {
                        listOfShapes.Add(new TheLines(startPoint, endPoint, currentColor, currentBoarderColor, brushThickness));
                    }
    
                    panelArea.Invalidate();
                }
            }
    
          
            private void rectangleToolStripMenuItem_Click(object sender, EventArgs e)
            {
                IsShapeRectangle = true;
                IsShapeCircle = false;
                IsShapeLine = false; 
            }
    
            private void ellipseToolStripMenuItem_Click(object sender, EventArgs e)
            {
                IsShapeRectangle = false;
                IsShapeCircle = true;
                IsShapeLine = false; 
            }
    
            private void lineToolStripMenuItem_Click(object sender, EventArgs e)
            {
                IsShapeCircle = false;
                IsShapeRectangle = false;
                IsShapeLine = true; 
            }
    
            private void ThicknessLevel0_Click(object sender, EventArgs e)
            {
                brushThickness = 0; 
            }
    
            private void ThicknessLevel2_Click(object sender, EventArgs e)
            {
                brushThickness = 2; 
            }
    
            private void ThicknessLevel4_Click(object sender, EventArgs e)
            {
                brushThickness = 4; 
            }
    
            private void ThicknessLevel6_Click(object sender, EventArgs e)
            {
                brushThickness = 6; 
            }
    
            private void ThicknessLevel8_Click(object sender, EventArgs e)
            {
                brushThickness = 8; 
            }
    
            private void ThicknessLevel10_Click(object sender, EventArgs e)
            {
                brushThickness = 10; 
            }
    
            private void ThicknessLevel12_Click(object sender, EventArgs e)
            {
                brushThickness = 12; 
            }
    
            private void ThicknessLevel14_Click(object sender, EventArgs e)
            {
                brushThickness = 14; 
            }
    
            private void FillColour_Click(object sender, EventArgs e)
            {
               
                ColorDialog fillColourDialog = new ColorDialog();
                fillColourDialog.ShowDialog();
                currentColor = fillColourDialog.Color;
                panelArea.Invalidate(); 
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                 
                ColorDialog fillColourDialog = new ColorDialog();
                fillColourDialog.ShowDialog();
                currentBoarderColor = fillColourDialog.Color;
                panelArea.Invalidate(); 
            }
    
           
        }
    }


How do i stop the flickering?


***UPDATE:***This code actually works great when i&#39;m drawing directly on the form. However, when i try to draw on the panel, flickering becomes an issue

how to stop flickering C# winforms

I need to convert a String to System.IO.Stream type to pass to another method.

I tried this unsuccessfully.

    Stream stream = new StringReader(contents);



Convert String to System.IO.Stream

I want to simulate mouse movement every x seconds. For that, I&#39;ll use a timer (x seconds) and when the timer ticks I&#39;ll make the mouse movement.

But, how can I make the mouse cursor move using C#?

How to move mouse cursor using C#?

I want to know the process and internals of string interning **specific to .Net framework**. Would also like to know the benefits of using interning and the scenarios/situations where we should use string interning to improve the performance. Though I have studied interning from the Jeffery Richter&#39;s CLR book but I am still confused and would like to know it in more detail.

[Editing] to ask a specific question with a sample code as below:

    private void MethodA()
    {
        string s = &quot;String&quot;; // line 1 - interned literal as explained in the answer        

        //s.intern(); // line 2 - what would happen in line 3 if we uncomment this line, will it make any difference?
    }

    private bool MethodB(string compareThis)
    {
        if (compareThis == &quot;String&quot;) // line 3 - will this line use interning (with and without uncommenting line 2 above)?
        {
            return true;
        }
        return false;
    }

String interning in .Net Framework - What are the benefits and when to use interning

Previous working asp.net webforms app now throws this error:

&gt; System.MissingMethodException: Method not found

The `DoThis` method is on the same class and it should work.

I have a generic handler as such:

    public class MyHandler: IHttpHandler
    {
        public void Processrequest(HttpContext context)
        {
          // throws error now System.MissingMethodException: 
          // Method not found.
          this.DoThis(); 
        }
    
        public void DoThis(){ ... }
    }

System.MissingMethodException: Method not found?

I&#39;ve looked at various Q&amp;As on SO similar to this question but haven&#39;t found a solution.

What I have is an enum which represents different ways to view a TV Guide...

In the NDroid `Application` class

    static enum guideView {
        GUIDE_VIEW_SEVEN_DAY,
        GUIDE_VIEW_NOW_SHOWING,
        GUIDE_VIEW_ALL_TIMESLOTS
    }

...when the user changes the view an event handler receives an `int` from 0-2 and I&#39;d like to do something like this...

In an Android `Activity` `onClick(DialogInterface dialog, int which)` event handler

    // &#39;which&#39; is an int from 0-2
    switch (which) {
        case NDroid.guideView.GUIDE_VIEW_SEVEN_DAY:
        ...
        break;
    }

I&#39;m used to C# enums and select/case statements which would allow something like the above and I know Java does things differently but I just can&#39;t make sense of what I need to do.

Am I going to have to resort to `if` statements? There will likely only ever be 3 choices so I could do it but I wondered how it could be done with switch-case in Java.

**EDIT** Sorry I didn&#39;t completely expand on the issue as I was looking at it as being a generic Java issue. I&#39;ve added to the question to explain a bit further.

There isn&#39;t anything that&#39;s Android specific which is why I didn&#39;t tag it as Android but the enum is defined in the `Application` class and the code where I wan&#39;t the switch is in an `Activity`. The enum is static as I need to access it from multiple Activities.

Java using enum with switch statement

This is a C++ interview test question not homework. 

    #include &lt;iostream&gt;
    using namespace std;
    enum months_t { january, february, march, april, may, june, july, august, september,    
      october, november, december} y2k;

     int main ()
      {
        cout &lt;&lt; &quot;sizeof months_t is  &quot; &lt;&lt; sizeof(months_t) &lt;&lt; endl;
        cout &lt;&lt; &quot;sizeof y2k is  &quot; &lt;&lt; sizeof(y2k) &lt;&lt; endl;
        enum months_t1 { january, february, march, april, may, june, july, august,    
           september, october, november, december} y2k1;
        cout &lt;&lt; &quot;sizeof months_t1 is  &quot; &lt;&lt; sizeof(months_t1) &lt;&lt; endl;
        cout &lt;&lt; &quot;sizeof y2k1 is  &quot; &lt;&lt; sizeof(y2k1) &lt;&lt; endl;
     }

Output:
&gt; sizeof months_t is  4  
&gt; sizeof y2k is  4  
&gt; sizeof months_t1 is  4  
&gt; sizeof y2k1 is  4  

Why is the size of all of these 4 bytes? Not 12 x 4 = 48 bytes?  
I know union elements occupy the same memory location, but this is an enum.


what is the size of an enum type data in C++?

I have a function which return a type int. However, I only have a value of the TAX enumeration.

How can I cast the TAX enumeration value to an int?

    public enum TAX {
    	NOTAX(0),SALESTAX(10),IMPORTEDTAX(5);
    		
    	private int value;
    	private TAX(int value){
            this.value = value;
        }
    }

    TAX var = TAX.NOTAX; // This value will differ

    public int getTaxValue()
    {
      // what do do here?
      // return (int)var;
    }



How to convert enum value to int?

I want to make a selectOneMenu dropdown so I can select a status on my question. Is it possible to make the f:selectItem more flexible considering what happens if the order of the enums changes, and if the list was large? And could I do this better? And is it possible to automatically &quot;select&quot; the item that the question have?
 
   **Enum class**

    public enum Status {
    	SUBMITTED,
    	REJECTED,
    	APPROVED
    }

**Question entity**
	

    @Enumerated(EnumType.STRING)
    private Status status;

**JSF**

	&lt;div class=&quot;field&quot;&gt;
		&lt;h:outputLabel for=&quot;questionStatus&quot; value=&quot;Status&quot; /&gt;
		&lt;h:selectOneMenu id=&quot;questionStatus&quot; value=&quot;#{bean.question.status}&quot; &gt;
			&lt;f:selectItem itemLabel=&quot;Submitted&quot; itemValue=&quot;0&quot; /&gt;
			&lt;f:selectItem itemLabel=&quot;Rejected&quot; itemValue=&quot;1&quot; /&gt;
			&lt;f:selectItem itemLabel=&quot;Approved&quot; itemValue=&quot;2&quot; /&gt;
		&lt;/h:selectOneMenu&gt;
		&lt;hr /&gt;
	&lt;/div&gt;

&lt;!----&gt;


How to use enum values in f:selectItem(s)

I have a recurrent chunk of code where I loop over all the members of an `enum class`.

The `for` loop that I currently use looks very unwieldly compared to the new `range-based for`.

Is there any way to take advantage of new C++11 features to cut down on the verbosity for my current `for` loop?

Current Code that I would like to improve:

    enum class COLOR
    {
    	Blue,
    	Red,
    	Green,
    	Purple,
    	First=Blue,
    	Last=Purple
    };
    
    inline COLOR operator++( COLOR&amp; x ) { return x = (COLOR)(((int)(x) + 1)); }
    
    int main(int argc, char** argv)
    {
      // any way to improve the next line with range-based for?
      for( COLOR c=COLOR::First; c!=COLOR::Last; ++c )
      {
        // do work
      }
      return 0;
    }

In other words, it would be nice if I could do something like:

    for( const auto&amp; c : COLOR )
    {
      // do work
    }


Content Type	Original Author	Original Content on Stackoverflow
Question	Bryan Migliorisi	View Question on Stackoverflow
Solution 1 - C#	Ry-	View Answer on Stackoverflow
Solution 2 - C#	parapura rajkumar	View Answer on Stackoverflow
Solution 3 - C#	Tom	View Answer on Stackoverflow

Check if a given Type is an Enum

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

TypeError: 'undefined' is not a function (evaluating '$(document)')

How to split newline

Attributions