In C# 8, range operators allow:

    var dest = source[100..200];

(and a range of other options for open-ended, counted from the end, etc)

Before that, LINQ allows:

    var dest = source.Skip(100).Take(100).ToArray();

or manually:

    var dest = new MyType[100];
    Array.Copy(source, 100, dest, 0, 100);
           // source,source-index,dest,dest-index,count

    

I was thinking to use `Tuple` class to store 2 integer information (StartAddress, EndAddress) I need in my program.

But I discover that `Tuple` items are ReadOnly, so if I need to set a value for an item, I need to re-instantiate a Tuple.

What is the reason behind this design decision?

Why Tuple&#39;s items are ReadOnly?

I have an equation that is only a tiny bit too wide for one line. I&#39;d really like to avoid having the equation number on the next line. How do you achieve this? Currently I&#39;m using `\small`, but this is overkill.

**Please note.** I have tried `scalebox` and `fittowidth` but get errors about missing `\endgroup`. I have also used `\!` to its full extent. I am hoping for a solution that will allow me to scale the proper one-line equation to the width of the page.

Here is an example (not my actual equation):
[![Long equation][1]][1]


  [1]: https://i.stack.imgur.com/CZUHD.png

Scale an equation to fit exact page width

I would like to select a range of items in an array of items.
For example I have an array of 1000 items, and i would like to &quot;extract&quot; items 100 to 200 and put them in another array.

Can you help me how this can be done?

Selecting a range of items inside an array in C#

<p>I would like to select a range of items in an array of items.
For example I have an array of 1000 items, and i would like to "extract" items 100 to 200 and put them in another array.</p>
<p>Can you help me how this can be done?</p>


Given an arbitrary enumeration in C#, how do I select a random value?

(I did not find this very basic question on SO. I&#39;ll post my answer in a minute as reference for anyone, but please feel free to post your own answer.)

How do I select a random value from an enumeration?

Question: I want to define a global exception handler for unhandled exceptions in my console application. In asp.net, one can define one in global.asax, and in windows applications /services, one can define as below



    AppDomain currentDomain = AppDomain.CurrentDomain;
    currentDomain.UnhandledException += new UnhandledExceptionEventHandler(MyExceptionHandler);


But how can I define a global exception handler for a console application ?&lt;br /&gt;
currentDomain seems not to work (.NET 2.0) ?

**Edit:**&lt;br /&gt;

Argh, stupid mistake.&lt;br /&gt;
In VB.NET, one needs to add the &quot;AddHandler&quot; keyword in front of currentDomain, or else one doesn&#39;t see the UnhandledException event in IntelliSense... &lt;br /&gt;
That&#39;s because the VB.NET and C# compilers treat event handling differently.

.NET Global exception handler in console application

&gt; **Possible Duplicate:**  
&gt; [most elegant way to return a string from List&amp;lt;int&amp;gt;](https://stackoverflow.com/questions/1334072/most-elegant-way-to-return-a-string-from-listint)  

&lt;!-- End of automatically inserted text --&gt;

I&#39;m not sure the easiest way to do this.  I simply want to add a ; between each value and spit it out as one string.  I don&#39;t see that you can do this with ToString().  I&#39;d have to loop through and create a stringbuilder and append &amp; add a &quot;;&quot;.

Convert List&lt;int&gt; to delimited string list

I would like to change decimal point to another character in C#. I have a `double` variable `value`

    double value;

and when I use the command:

    Console.WriteLine(value.ToString()); // output is 1,25

I know I can do this:

    Console.WriteLine(value.ToString(
        CultureInfo.CreateSpecificCulture(&quot;en-GB&quot;))); // output is 1.25

but I don&#39;t like it very much because it&#39;s very long and I need it quite often in my program.

Is there a shorter version for setting &quot;decimal point&quot; really as point and not comma as is in my culture is usual?

How to change symbol for decimal point in double.ToString()?

It&#39;s common to see a `_var` variable name in a class field. What does the underscore mean? Is there a reference for all these special naming conventions?


Naming convention - underscore in C++ and C# variables

Is there a way to deserialize JSON content into a C# dynamic type? It would be nice to skip creating a bunch of classes in order to use the `DataContractJsonSerializer`. 

Deserialize JSON into C# dynamic object?

Occasionally I like to spend some time looking at the .NET code just to see how things are implemented behind the scenes. I stumbled upon this gem while looking at the `String.Equals` method via Reflector.

**C#**

    [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
    public override bool Equals(object obj)
    {
        string strB = obj as string;
        if ((strB == null) &amp;&amp; (this != null))
        {
            return false;
        }
        return EqualsHelper(this, strB);
    }

**IL**

    .method public hidebysig virtual instance bool Equals(object obj) cil managed
    {
        .custom instance void System.Runtime.ConstrainedExecution.ReliabilityContractAttribute::.ctor(valuetype System.Runtime.ConstrainedExecution.Consistency, valuetype System.Runtime.ConstrainedExecution.Cer) = { int32(3) int32(1) }
        .maxstack 2
        .locals init (
            [0] string str)
        L_0000: ldarg.1 
        L_0001: isinst string
        L_0006: stloc.0 
        L_0007: ldloc.0 
        L_0008: brtrue.s L_000f
        L_000a: ldarg.0 
        L_000b: brfalse.s L_000f
        L_000d: ldc.i4.0 
        L_000e: ret 
        L_000f: ldarg.0 
        L_0010: ldloc.0 
        L_0011: call bool System.String::EqualsHelper(string, string)
        L_0016: ret 
    }

What is the reasoning for checking `this` against `null`? I have to assume there is purpose otherwise this probably would have been caught and removed by now.





Why check this != null?

Is there a way to declare first and then initialize an array in C?

So far I have been initializing an array like this:


    int myArray[SIZE] = {1,2,3,4....};

But I need to do something like this

    int myArray[SIZE];
    
    myArray = {1,2,3,4....};







Declaring and initializing arrays in C

I&#39;m sure this is an extremely obvious question, and that there&#39;s a function that does exactly this, but I can&#39;t seem to find it. In PHP, I&#39;d like to know if my array has duplicates in it, as efficiently as possible. I don&#39;t want to remove them like `array_unique` does, and I don&#39;t particularly want to run `array_unique` and compare it to the original array to see if they&#39;re the same, as this seems very inefficient. As far as performance is concerned, the &quot;expected condition&quot; is that the array has no duplicates.

I&#39;d just like to be able to do something like

    if (no_dupes($array))
        // this deals with arrays without duplicates
    else
        // this deals with arrays with duplicates

Is there any obvious function I&#39;m not thinking of?  
https://stackoverflow.com/questions/1170807/how-to-detect-duplicate-values-in-php-array  
has the right title, and is a very similar question, however if you actually read the question, he&#39;s looking for array_count_values.

php: check if an array has duplicates

This Ruby code is not behaving as I would expect:

    # create an array of hashes
    sort_me = []
    sort_me.push({&quot;value&quot;=&gt;1, &quot;name&quot;=&gt;&quot;a&quot;})
    sort_me.push({&quot;value&quot;=&gt;3, &quot;name&quot;=&gt;&quot;c&quot;})
    sort_me.push({&quot;value&quot;=&gt;2, &quot;name&quot;=&gt;&quot;b&quot;})
    
    # sort
    sort_me.sort_by { |k| k[&quot;value&quot;]}

    # same order as above!
    puts sort_me

I&#39;m looking to sort the array of hashes by the key &quot;value&quot;, but they are printed unsorted.


How do I sort an array of hashes by a value in the hash?

    int[] array1 = {1, 2, 3, 4, 5, 6, ,7, 8}; - working


    array1 = {1, 1, 1, 1, 2, 5, ,7, 8}; - NOT working

The first line is working, but second line is not working.

 How can I make the initialization from the second line in one single line of code? 

Java: How initialize an array in Java in one line?

I am trying to find the intersection values between multiple arrays.

for example

    code1 = [1,2,3]
    code2 = [2,3,4]
    code3 = [0,2,6]

So the result would be 2

I know in PHP you can do this with array_intersect

I wanted to be able to easily add additional array so I don&#39;t really want to use multiple loops

Any ideas ?

Thanks, Alex

Content Type	Original Author	Original Content on Stackoverflow
Question	mouthpiec	View Question on Stackoverflow
Solution 1 - C#	Marc Gravell	View Answer on Stackoverflow

Selecting a range of items inside an array in C#

C# Problem Overview

C# Solutions

Solution 1 - C#

Scale an equation to fit exact page width

Why Tuple's items are ReadOnly?

Attributions