71
\$\begingroup\$

What general tips do you have for golfing in C#? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to C# (e.g. "remove comments" is not an answer). Please post one tip per answer.

-- borrowed from marcog's idea ;)

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2
  • 1
    \$\begingroup\$ BEST TIP => Use something beside .NET if you don't want to submit the longest answer for the challenge. .NET is designed to be very verbose and to let the IDE do the typing. Which is actually not as bad as it sounds for general programming as long as you have that IDE crutch but for code golf that strategy is certain fail. \$\endgroup\$
    – krowe
    Jul 2, 2014 at 5:48
  • \$\begingroup\$ Forgive me for the picture of a calendar, it was all I could find on short notice. \$\endgroup\$ Jul 8, 2014 at 12:44

55 Answers 55

63
\$\begingroup\$

Instead of using .ToString() use +"" for numerics and other types that can be natively cast to a string safely.

.ToString() <-- 11 chars
+""         <--  3 chars
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8
  • 7
    \$\begingroup\$ This also works in JS. \$\endgroup\$
    – Cyoce
    Apr 5, 2016 at 18:25
  • 1
    \$\begingroup\$ This is usually actually 5 chars if you need to use the string afterwards for including the braces... (1+"").DoSomethingWith1String(); \$\endgroup\$ May 18, 2017 at 12:48
  • 1
    \$\begingroup\$ If you need the string you're usually storing it. Just about any other usage can natively infer the ToString()... \$\endgroup\$
    – jcolebrand
    May 18, 2017 at 14:38
  • 1
    \$\begingroup\$ Note that this actually calls the static String.Concat(object) with the argument, rather than the virtual calling object.ToString(). Concat explicitly converts null to the empty string (see the reference source). There is no 'native casting' going on, you can convert anything like this, it's just that the result might not be very useful in some cases! (but the null behaviour may well be). \$\endgroup\$ Jul 11, 2017 at 20:01
  • 1
    \$\begingroup\$ Alternative - string interpolation: $"{n}" \$\endgroup\$ Jan 4, 2019 at 11:24
44
\$\begingroup\$

I once deliberately placed my program in namespace System so I can shorten access to a specific class. Compare

using System;using M=System.Math;

to

namespace System{using M=Math;
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5
  • 10
    \$\begingroup\$ Just remember that it is better to fully qualify classes/functions when a single use solves the problem. This is only useful if you have to call something more than once, and even then only for items in the System namespace. \$\endgroup\$ Jan 31, 2011 at 14:43
  • \$\begingroup\$ You can also just do using System;class P.... \$\endgroup\$
    – ldam
    Jun 5, 2015 at 19:15
  • \$\begingroup\$ @Logan: This wasn't about just using System; but also about having an alias for a class in the same namespace, which is shorter the way I've shown here. \$\endgroup\$
    – Joey
    Jun 5, 2015 at 20:28
  • 1
    \$\begingroup\$ It's even shorter to do using static System.Math; in C#6 (add you can use any of those functions as if they were truly global--not in a class). The original suggestion may still be shorter than using static if you need to access multiple classes. \$\endgroup\$
    – milk
    Sep 1, 2016 at 1:51
  • 1
    \$\begingroup\$ @milk: the additional static keyword often is longer than any savings from leaving out M. on the method calls, but yes, it's an option, but it comes at a hefty upfront cost that needs lots of calls to amortise. \$\endgroup\$
    – Joey
    Sep 1, 2016 at 5:44
33
\$\begingroup\$

If using LINQ you can pass a method directly to Select instead of making a lambda.

So, instead of

foo.Select(x=>int.Parse(x))

you can use

foo.Select(int.Parse)

directly.

(Discovered recently when improving on one of Timwi's C# answers.)

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4
  • 2
    \$\begingroup\$ FWITW this is called η-reduction \$\endgroup\$
    – ThreeFx
    Sep 13, 2016 at 11:30
  • \$\begingroup\$ It's also known as "point free" style \$\endgroup\$ Mar 2, 2017 at 18:04
  • 8
    \$\begingroup\$ To the more pragmatic of us, it's simply shorter :-þ \$\endgroup\$
    – Joey
    Mar 3, 2017 at 8:06
  • \$\begingroup\$ Interesting! Would love to learn more. I asked a question over at softwareengineering @ThreeFx \$\endgroup\$
    – David
    Jun 10, 2020 at 9:09
32
\$\begingroup\$

Use var for declaring and initializing (single) variables to save characters on the type:

string x="abc";

becomes

var x="abc";

Isn't particulaly necessary for int, of course.

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1
  • 3
    \$\begingroup\$ Remember that var cannot have multiple declarators, for example var x="x",y="y"; is not possible. \$\endgroup\$
    – Ian H.
    Nov 22, 2017 at 8:57
26
\$\begingroup\$

Remember that the smallest compilable program in C# is 29 characters:

class P
{
    static void Main()
    {   
    }
}

So start by removing that from your length and judge your answer on how much over that it takes. C# cannot compete with other languages when it comes to printing or reading input, which is the heart of most [code-golf] problems, so don't worry about that. As a C# golfer, you're really competing against the language.

A few other things to keep in mind:

  • Reduce all loops and if statements to a single line if possible in order to remove the brackets.
  • If given the option between stdin and command line, always use command line!
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5
  • \$\begingroup\$ This does usually involve ternary as well ;) \$\endgroup\$
    – jcolebrand
    Jan 31, 2011 at 14:47
  • 2
    \$\begingroup\$ As a C# golfer, you're really competing against the language Unbelievably related \$\endgroup\$
    – dorukayhan
    Jul 19, 2016 at 15:07
  • 1
    \$\begingroup\$ Actually, that's not true. It compiles using static int Main() as well, which would be 28 characters. \$\endgroup\$
    – Metoniem
    Feb 14, 2017 at 14:14
  • 2
    \$\begingroup\$ @Metoniem That requires a return something. \$\endgroup\$
    – DELETE_ME
    Mar 27, 2018 at 14:54
  • \$\begingroup\$ Be advised that starting with C# 9 you can use top-level statements thus making the smallest compilable program exactly 0 bytes (docs.microsoft.com/en-us/dotnet/csharp/fundamentals/…) \$\endgroup\$
    – bazzilic
    Feb 19 at 8:05
24
\$\begingroup\$

Instead of

bool a = true;
bool b = false;

do

var a=0<1;
var b=1<0;

If you need multiple variables, use this (suggested by @VisualMelon)

bool a=0<1,b=!a;
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1
  • \$\begingroup\$ Note that if you need multiple variables of the same type it is usually cheaper to declare the type a comma separate the declarations bool a=0<1,b=!a; \$\endgroup\$ Jan 13, 2017 at 9:37
21
\$\begingroup\$

When reading each character of a command line argument, rather than looping up to the string's length:

static void Main(string[]a){
    for(int i=0;i<a[0].Length;)Console.Write(a[0][i++]);
}

You can save a character by using a try/catch block to find the end:

static void Main(string[]a){
    try{for(int i=0;;)Console.Write(a[0][i++]);}catch{}
}

This applies to any array within an array such as:

  • string[]
  • int[][]
  • IList<IList<T>>
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3
  • 10
    \$\begingroup\$ That is truly horrifying... I love it! \$\endgroup\$ Jul 9, 2016 at 18:19
  • 2
    \$\begingroup\$ holy crap this is genius, I actually just saved a character while looping an array \$\endgroup\$
    – Gaspa79
    Apr 9, 2017 at 6:13
  • 3
    \$\begingroup\$ This is truly evil! \$\endgroup\$ Aug 8, 2017 at 17:17
17
\$\begingroup\$

If you need to use Console.ReadLine() multiple times in your code (min 3 times), you could do:

Func<string>r=Console.ReadLine;

and then just use

r()

instead

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5
  • \$\begingroup\$ I think you need to remove () from the first line. \$\endgroup\$
    – mellamokb
    Apr 13, 2012 at 12:51
  • \$\begingroup\$ @mellamokb that's right, thanks! fixed. \$\endgroup\$ Apr 13, 2012 at 13:50
  • 1
    \$\begingroup\$ Can't you do auto r=Console.ReadLine;? \$\endgroup\$
    – Claudiu
    Sep 25, 2014 at 16:36
  • 2
    \$\begingroup\$ @claudiu no, unfortunally not ideone.com/jFsVPX \$\endgroup\$ Sep 25, 2014 at 17:19
  • \$\begingroup\$ @Claudiu, auto is a C++ verb. var is for C#. The reason this can't be done is because Console.ReadLine is overloaded so the function signature needs to be specified in order to tell the compiler which overload is wanted. \$\endgroup\$ Aug 8, 2017 at 17:15
17
\$\begingroup\$

Favor the ternary operator over if..else blocks where appropriate.

For example:

if(i<1)
    j=1;
else
    j=0;

is more efficiently:

j=i<1?1:0;
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6
  • 16
    \$\begingroup\$ Am I the only one that feels that the second case is inherently more readable for things like this in general? I do that routinely. In addition, if I need to avoid a null condition (like on a string) I do something like var x = input ?? ""; (I loves my coalesces) \$\endgroup\$
    – jcolebrand
    Jan 31, 2011 at 14:31
  • \$\begingroup\$ There are times when it is far from being the more readable option, particularly when i < 1 is a complex statement or when the name of j is long. IMO, it also fails to convey side effects very well. In the case where if (i < 1) is something like if (SendEmail(recipient)) which returns true/false depending on the success of the side effects, I prefer the if/then notation. \$\endgroup\$ Jan 31, 2011 at 15:01
  • 11
    \$\begingroup\$ No need for parentheses in the second case - j=i<1?1:0; is enough. \$\endgroup\$ Apr 18, 2011 at 13:28
  • 3
    \$\begingroup\$ The question asks for tips which are somewhat specific to C#. This is one included in the tips for all languages. \$\endgroup\$ Mar 17, 2014 at 20:35
  • 4
    \$\begingroup\$ @PeterTaylor I answered this question over 3 years ago, well before the thread you linked was created \$\endgroup\$
    – Nellius
    Mar 18, 2014 at 15:31
16
\$\begingroup\$

Effective use of using

You can replace float (which is an alias for System.Single) with z using z=System.Single;

Then replace z=System.Single; with z=Single; by placing the program in the namespace System. (As with Joey's answer)

This can be applied for other value types (use what they are an alias for), structs and classes

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14
\$\begingroup\$

LINQ

Instead of using:

Enumerable.Range(0,y).Select(i=>f(i))

to get an Enumerable with the result of function f for every int in [0,y] you can use

new int[y].Select((_,i)=>f(i))

if you need string or anything that implements Enumerable in your program you can use them too

var s="I need this anyway";
s.Select((_,i)=>f(i))
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3
  • \$\begingroup\$ I use this trick in my answer for the Shamir's Secret Sharing challenge. \$\endgroup\$
    – aloisdg
    Jul 7, 2016 at 20:01
  • \$\begingroup\$ I don't think that the string part will execute if you don't iterate the ienumerable with optimization on. Just failed for me until I did .ToArray();. Other than that, amazing tip! \$\endgroup\$
    – Gaspa79
    Apr 9, 2017 at 23:34
  • \$\begingroup\$ Yes enumerables are lazy but that is true for all three examples not just the one with the string. \$\endgroup\$
    – raggy
    Apr 10, 2017 at 16:39
13
\$\begingroup\$

Use lambdas to define a function in C# 6

In C# 6, you can use a lambda to define a function:

int s(int a,int b)=>a+b;

This is shorter than defining a function like this:

int s(int a,int b){return a+b;}
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3
  • 3
    \$\begingroup\$ C#6 gives a whole new range of ability to code-golf \$\endgroup\$
    – jcolebrand
    Jan 11, 2015 at 23:32
  • \$\begingroup\$ In C#7, this can be done inside another function to create local functions. I doubt this will help while golfing, but it's still just a neat trick to know. \$\endgroup\$
    – TehPers
    Aug 4, 2017 at 16:38
  • 2
    \$\begingroup\$ That's not formally a lambda. It's an expression bodied member. \$\endgroup\$
    – recursive
    Nov 22, 2017 at 22:32
13
\$\begingroup\$

In C#, we are not allowed to do if(n%2) to check if n is a even number. If we do, we get a cannot implicity convert int to bool. A naive handling would be to do:

if(n%2==0)

A better way is to use:

if(n%2<1)

I used this to gain one byte here.

note that this only works for positive numbers, as -1%2==-1, it is considered even with this method.

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11
\$\begingroup\$

Looping:

Variable declarations:

int max;
for(int i=1;i<max;i++){
}

become:

int max,i=1;
for(;i<max;i++){
}

And if you have a need to or work with the i variable only once, you could start at -1 (or 0 depending on the loop circumstance) and increment inline:

int max,i=1;
for(;i<max;i++){
  Console.WriteLine(i);
}

to

int max,i=1;
for(;i<max;){
  Console.WriteLine(++i);
}

And that reduces by one character, and slightly obfuscates the code as well. Only do that to the FIRST i reference, like thus: (granted one character optimizations aren't much, but they can help)

int max,i=1;
for(;i<max;i++){
  Console.WriteLine(i + " " + i);
}

to

int max,i=1;
for(;i<max;){
  Console.WriteLine(++i + " " + i);
}

when the loop does not have to increment i (reverse order loop):

for(int i=MAX;--i>0;){
      Console.WriteLine(i);
}
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7
  • \$\begingroup\$ I usually put the ++ in such cases directly into the loop header: for(;++i<max;) which is both easier to follow and harder to get wrong. \$\endgroup\$
    – Joey
    Mar 3, 2011 at 10:49
  • \$\begingroup\$ @Joey In those cases I tend to switch to while(++i<max) which is the same length but easier to read. \$\endgroup\$
    – ICR
    Dec 7, 2011 at 14:17
  • \$\begingroup\$ ICR: depends on whether you can put another (earlier) statement into the for header as well, which would then save a character again. \$\endgroup\$
    – Joey
    Dec 7, 2011 at 15:09
  • \$\begingroup\$ You can move both declarations back into the for clause for a1 byte savings. \$\endgroup\$
    – recursive
    Jul 4, 2016 at 3:39
  • 1
    \$\begingroup\$ If you won't need the variable again, you can use: while(max-->0) { foo;} \$\endgroup\$
    – Zuabros
    Aug 19, 2020 at 20:23
11
\$\begingroup\$

If you need to use a generic Dictionary<TKey, TValue> at least two times in your code, you could declare a dictionary class, like in this example:

class D:Dictionary<int,string>{}

and then just use

D d=new D{{1,"something"},{2,"something else"}};

instead of repeating Dictionary<int,string> for every instantiation.

I have used this technique in this answer

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3
  • 2
    \$\begingroup\$ And also "D d" instead of "var d" \$\endgroup\$
    – Zukki
    Jun 4, 2015 at 19:48
  • \$\begingroup\$ @Zukki Obviously! What was I thinking? :) \$\endgroup\$ Jun 5, 2015 at 6:24
  • 1
    \$\begingroup\$ Alternative: using D = System.Collections.Generic.Dictionary<int,string>; \$\endgroup\$ Jan 4, 2019 at 10:58
10
\$\begingroup\$

For one-line lambda expressions, you can skip the brackets and semicolon. For one-parameter expressions, you can skip the parentheses.

Instead of

SomeCall((x)=>{DoSomething();});

Use

SomeCall(x=>DoSomething);
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3
  • 13
    \$\begingroup\$ I never write the parentheses for one-parameter lambdas, even on production code. \$\endgroup\$ Feb 2, 2011 at 1:34
  • \$\begingroup\$ I always use the brackets because I like to split the lambda into multiple lines for readability. \$\endgroup\$ Feb 2, 2011 at 21:02
  • 3
    \$\begingroup\$ SomeCall(DoSomething) is even better \$\endgroup\$ Aug 8, 2017 at 17:18
10
\$\begingroup\$

You can use float and double literals to save a few bytes.

var x=2.0;
var y=2d;         // saves 1 byte

When you need some int arithmetic to return a float or double you can use the literals to force the conversion.

((float)a+b)/2;  // this is no good
(a+b)/2.0;       // better
(a+b)/2f;        // best      

If you ever run into a situation where you have to to cast you can save a few bytes by using multiplication instead.

((double)x-y)/(x*y);
(x*1d-y)/(x*y);      // saves 5 bytes
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1
  • 1
    \$\begingroup\$ Even shorter: (x-y)*1d/x/y; \$\endgroup\$
    – recursive
    May 21, 2019 at 20:08
9
\$\begingroup\$

Remember where private or public are inherent, such as the following:

class Default{static void Main()

as compared to

public class Default { public static void Main()
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9
  • 5
    \$\begingroup\$ And always make the class one letter only :-) \$\endgroup\$
    – Joey
    Jan 29, 2011 at 11:40
  • 2
    \$\begingroup\$ Oh, and another nice thing, implied here: Main does not need any arguments in contrast to Java, for example. \$\endgroup\$
    – Joey
    Jan 29, 2011 at 19:10
  • \$\begingroup\$ @Joey: and neither does it need to be public. \$\endgroup\$ Jan 31, 2011 at 2:36
  • 1
    \$\begingroup\$ @martinho ~ did you read my answer? ;) no public on main \$\endgroup\$
    – jcolebrand
    Jan 31, 2011 at 13:53
  • \$\begingroup\$ @Joey ~ I was trying to keep it to one per post ;) ... figured someone else would post taht about main or classes only being one letter. Seeing as how nobody else has, I'll go ahead and add that one too. \$\endgroup\$
    – jcolebrand
    Jan 31, 2011 at 13:54
8
\$\begingroup\$

There are circumstances when an output parameter can save characters. Here's a slightly contrived example, a 10 pin bowling score algorithm.

With a return statement:

........10........20........30........40........50........60........70........80........90.......100.......110.......120.......130.......140.......150..
public double c(int[]b){int n,v,i=0,X=10;double t=0;while(i<19){n=b[i]+b[i+1];v=b[i+2];t+=(n<X)?n:X+v;if(b[i]>9)t+=b[i+(i>16|v!=X?3:4)];i+=2;}return t;}

And with an output parameter:

........10........20........30........40........50........60........70........80........90.......100.......110.......120.......130.......140.......
public void d(int[]b,out double t){int n,v,i=0,X=10;t=0;while(i<19){n=b[i]+b[i+1];v=b[i+2];t+=(n<X)?n:X+v;if(b[i]>9)t+=b[i+(i>16|v!=X?3:4)];i+=2;}}

The output parameter here saves a total of 5 characters.

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8
\$\begingroup\$

Use dynamic to group declarations

dynamic is a forgotten feature that literally performs dynamic typing in C#! It has limitations (doesn't support extension methods, is bad at inferring that you want to use it, ...), but can often save bytes by merging declarations of incompatible types. Compare the following:

var a=[something of type IEnumerable<int>];var b=[something of type string];int i=x+~y^z
dynamic a=[something of type IEnumerable<int>],b=[something of type string],i=x+~y^z

That's 4 bytes of savings!

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2
  • \$\begingroup\$ One of the best tips on the page. \$\endgroup\$
    – primo
    May 29, 2020 at 17:51
  • 1
    \$\begingroup\$ With C# 7, you can sometimes save another byte with tuples: var(a,i)=([...],[...]). \$\endgroup\$
    – nwellnhof
    Sep 30, 2020 at 18:36
7
\$\begingroup\$

Use the weird kind of the is operator

a is var b always defines the variable b equal to a and returns true. It is unclear how have the humans who design C# come up with this (inline variable declarations that return true for some reason seem to be beyond Javascript to me), but it works. It can sometimes be used to shorten code (this is an oversimplified example; savings can often be smaller or zero):

a=>{var b=f(a);return g(b,b);}
a=>g(f(a)is var b?b:b,b)
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6
\$\begingroup\$

String Interpolation

A really simple space-saving improvement is interpolation. Instead of:

string.Format("The value is ({0})", (method >> 4) + 8)

just use $ to inline expressions:

$"The value is ({(method >> 4) + 8})"

This, together with the new expression bodies in C#6.0 should make any simple string-calculation challenge pretty golfable in C#.

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4
  • 3
    \$\begingroup\$ Also note that i+$" bottles of beer"; is shorter than $"{i} bottles of beer". \$\endgroup\$
    – aloisdg
    Jul 8, 2016 at 14:56
  • 1
    \$\begingroup\$ @aloisdg In that first case you should leave $ out, though. \$\endgroup\$
    – Metoniem
    Feb 14, 2017 at 14:21
  • \$\begingroup\$ @Metoniem Indeed! I let it because in my original case I had two {i} one in front and one in the middle ;) \$\endgroup\$
    – aloisdg
    Feb 14, 2017 at 14:37
  • \$\begingroup\$ @aloisdg Ahh, I see. Yeah, shame comments can't be edited :( \$\endgroup\$
    – Metoniem
    Feb 14, 2017 at 14:40
6
\$\begingroup\$

If you need to include multiple usings that all fall off of the same hierarchy it is often shorter to use the longest one as the namespace:

using System;
using System.Linq;
//Some code

vs:

namespace System.Linq
{
    //Some code
}
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6
\$\begingroup\$

Use C# lambda. Since PPCG allows lambda for input/output we should use them.

A classic C# methods looks like this:

bool Has(string s, char c)
{
    return s.Contains(c);
}

As a lambda, we will write

Func<string, char, bool> Has = (s, c) => s.Contains(c);

Anonymous lambda are allowed too:

(s, c) => s.Contains(c)

Remove all the noise and focus!

Update:

We can improve one step more with currying as @TheLethalCoder comment:

s => c => s.Contains(c);

Example of curring by @Felix Palmen: How compute WPA key?

It will be helpful when you have exactly 2 parameters, then a empty unused variable _ will be better. See meta post about this. I use this trick here. You will have to change a bit the function. Example: Try it online!

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6
  • 1
    \$\begingroup\$ Not sure if it's anywhere else in the tips but for this example you can use currying too... s=>c=>... \$\endgroup\$ Jan 9, 2017 at 14:30
  • \$\begingroup\$ @TheLethalCoder Indeed we can! I will update the answer thank you! \$\endgroup\$
    – aloisdg
    Jan 10, 2017 at 8:43
  • \$\begingroup\$ Can you use eta-reduction in this case? Something like this: s=>s.Contains. \$\endgroup\$
    – corvus_192
    Jan 11, 2017 at 10:20
  • \$\begingroup\$ Note that C# and Java answers of the 'untyped lambda' variety are falling out of favour, you might wish to join the discussion on this meta post. The suggested alternative is (string s,char c)=>s.Contains(c) \$\endgroup\$ Jan 13, 2017 at 9:34
  • \$\begingroup\$ Discussion about unamed functions \$\endgroup\$
    – aloisdg
    Nov 24, 2017 at 12:34
6
\$\begingroup\$

The Compute instance method of System.Data.DataTable, allows to evaluate a simple string expression, e.g. :

C# (Visual C# Compiler), 166 bytes

namespace System.Data
{
    class P
    {
        static void Main()
        {
            Console.Write(new DataTable().Compute("30*2+50*5/4",""));
        }
    }
}

Try it online!

Not very "golfy" per se, but sometimes might be useful.

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6
\$\begingroup\$

Swapping two variables

Normally, to swap two variables, you have to declare a temporary variable to store the value. It would look like something along the lines of this:

var c=a;a=b;b=c;

That's 16 bytes! There are some other methods of swapping that are better.

//Using tuples
(a,b)=(b,a);
//Bitwise xoring 
a=a^b^(b=a);
//Addition and subtraction
a=a+b-(b=a);
//Multiplication and division
a=a*b/(b=a);

The last three only work for numeric values, and as ASCII-only pointed out, the last two might result in an ArithmeticOverflow exception. All of the above are 12 bytes, a 4 byte saving compared to the first example.

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1
  • \$\begingroup\$ Only applies for numbers though, and even then anything other than tuples and xor risk running into integer limits of you're applying this to integers. Occasionally, other number types will run into limits too \$\endgroup\$
    – ASCII-only
    Feb 20, 2019 at 3:42
6
\$\begingroup\$

Avoid single-statement foreach loops

If the loop's statement returns a non-int (including void!) "value", it can be replaced with LINQ:

foreach(var x in a)Console.WriteLine(F(x));
a.Any(x=>Console.WriteLine(F(x))is int);

If the value happens to be an int, you can use a condition that will always be true or always be false (for example, >0 or <n), a different type and/or All instead of Any.

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5
\$\begingroup\$

Make classnames only one letter. Enhancing on Tips for code-golfing in C# we go from

class Default{static void Main()

to

class D{static void Main()

which knocks out another 6 chars in this case.

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2
  • 1
    \$\begingroup\$ ditto with variable names \$\endgroup\$
    – Nellius
    Jan 31, 2011 at 14:07
  • 13
    \$\begingroup\$ How is this "at least somewhat specific to C#"? \$\endgroup\$ Feb 21, 2014 at 17:49
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Using LinqPad will give you the possibility to remove all the program overhead as you can execute statements directly. (And it should be fully legal in codegolf... No one says you need an .exe)

Output is done using the .Dump() extension method.

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  • 1
    \$\begingroup\$ .NetFiddle support .Dump() ;) \$\endgroup\$
    – aloisdg
    Jul 8, 2016 at 15:04
  • \$\begingroup\$ Could you explain it a bit more? \$\endgroup\$
    – Zuabros
    Sep 18, 2020 at 15:01
4
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Use Action like Func to set a function to a variable. Action returns nothing (void) so it is great for printing.

For example:

Action<string>w=Console.WriteLine;
w("Hello World");

This tips is inspired by @W0lf great example of use of Func with ReadLine.

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