C# Cheat Sheet 2020

C# Syntax Cheat Sheet
C# Reference Sheet
C# Programming Cheat Sheet
C# Cheat Sheet 2020 Printable

C $72.13 -$0.32 -0.4% Price as of April 19, 2021, 4:00 p.m. ET View Interactive C Charts. Tidy Evaluation with rlang Cheatsheet. Tidy Evaluation (Tidy Eval) is a framework for doing non-standard evaluation in R that makes it easier to program with tidyverse functions. Non-standard evaluation, better thought of as “delayed evaluation,” lets you capture a user’s R code to run later in a new environment or against a new data frame.

Data Types

bool

C-like languages feature two versions (pre- and post-) of each operator with slightly different semantics. In languages syntactically derived from B (including C and its various derivatives), the increment operator is written as and the decrement operator is written as -. Several other languages use inc(x) and dec(x) functions.

Boolean valuebyte8-bit unsigned integerchar16-bit Unicode characterdecimal128-bit precise decimal values with 28-29 significant digitsdouble64-bit double-precision floating pointfloat32-bit single-precision floating pointint32-bit signed integerlong64-bit signed integerobjectBase type for all other typessbyte8-bit signed integershort16-bit signed integerstringString valueuint32-bit unsigned integerulong64-bit unsigned integerushort16-bit unsigned integer

Type Conversion Methods

ToBooleanToByteToCharToDateTimeToDecimalToDoubleToInt16ToInt32ToInt64ToSbyteToSingleToStringToTypeToUInt16ToUInt32ToUInt64

Naming Conventions

ClassMyClassMethodMyMethodLocal variablemyLocalVariablePrivate variable_myPrivateVariableConstantMyConstant

Arrays

int[] array = new int[] {1, 2, 3}int[] array = {1, 2, 3}var array = new int[] {1, 2, 3}int[] array = new int[3]

Statements

if-elseif (true) {..}
else if (true) {..}
else {..}switchswitch (var) {
case 1: break;
default: break; }forfor (int i =1; i < 5; i++) {..}foreach-inforeach (int item in array) {..}whilewhile (true) {..}do.. whiledo {..}
while (true);try-catch-finallytry {..}
catch (Exception e) {..}
catch {..}
finally {..}

Classes

Classpublic class Dog {..}Inheritancepublic class Dog: Pet {..}Constructor (no parameters)public Dog () {..}Constructors can co-existConstructor (one parameter)public Dog (string var) {..}Constructors can co-existFieldpublic string nameStatic Classpublic static class Dog {..}Must only have static membersStatic Memberpublic static int = 1Finalizer (destructor)~Dog () {..}Cannot have modifiers or parameters

Access Modifiers

publicAccessible by any other code in the same assembly or another assembly that references itprivateOnly accessible by code in the same class or structprotectedOnly accessible by code in the same class or struct, or in a derived classinternalAccessible by any code in the same assembly, but not from another assemblyprotected internalAccessible by any code in the same assembly, or by any derived class in another assembly

Other Modifiers

abstractIndicates that a class is intended only to be a base class of other classesasyncIndicates that the modified method, lambda expression, or anonymous method is asynchronousconstSpecifies that the value of the field or the local variable cannot be modifiedeventDeclares an eventexternIndicates that the method is implemented externallynewExplicitly hides a member inherited from a base classoverrideProvides a new implementation of a virtual member inherited from a base class

C# Syntax Cheat Sheet

partialDefines partial classes, structs and methods throughout the same assemblyreadonlyDeclares a field that can only be assigned values as part of the declaration or in a constructor in the same classsealedSpecifies that a class cannot be inheritedstaticDeclares a member that belongs to the type itself instead of to a specific objectunsafeDeclares an unsafe contextvirtualDeclares a method or an accessor whose implementation can be changed by an overriding member in a derived classvolatileIndicates that a field can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread

Assignment Operators

=Simple assignment+=Addition assignment-=Subtraction assignment*=Multiplication assignment/=Division assignment%=Remainder assignment&=

C# Reference Sheet

AND assignment|=OR assignment^XOR assignment<<=Left-shift assignment>>=Right-shift assignment

Comparison Operators

<Less than>Greater than<=Less than or equal to>=Greater than or equal toEqual to!=Not equal to

Arithmetic Operators

+Add numbers-Subtract numbers*Multiply numbers/Divide numbers%Compute remainder of division of numbers++Increases integer value by 1--Decreases integer value by 1

Logical and Bitwise Operators

&&Logical AND||Logical OR!Logical NOT&Binary AND|Binary OR^Binary XOR~Binary Ones Complement<<Binary Left Shift>>Binary Right Shift

Other Operators

sizeof()Returns the size of a data typetypeof()Returns the type of a class&Returns the address of a variable*Pointer to a variable? :Conditional expressionisDetermines whether an object is of a specific typeasCast without raising an exception if the cast fails

Locomotives operated by the Chesapeake and Ohio Railway.

Steam locomotives[edit]

Class A: 4-4-0 and 4-4-2[edit]

Class B: 2-10-2[edit]

Class C: 0-6-0, 0-8-0, 0-10-0, and Shays[edit]

Class E: 2-6-0[edit]

Class F: 4-6-0 and 4-6-2[edit]

Class G: 2-8-0[edit]

Class H: 2-6-6-2, 2-8-8-2, 2-6-6-6[edit]

Nero burning rom 2019 full version. Class H was used for the 2-6-6-2, 2-8-8-2, and 2-6-6-6 Allegheny types

Chesapeake and Ohio class H-1 2-6-6-2
Chesapeake and Ohio class H-2 2-6-6-2
Chesapeake and Ohio class H-3 ex-Hocking Valley Railway 2-6-6-2
Chesapeake and Ohio class H-4 2-6-6-2
Chesapeake and Ohio class H-5 2-6-6-2
Chesapeake and Ohio class H-6 2-6-6-2
Chesapeake and Ohio class H-7 and H-7-A 2-8-8-2
Chesapeake and Ohio class H-8 2-6-6-6

Class J: 4-8-2 and 4-8-4[edit]

Class J was used for 4-8-2 Mountain and 4-8-4 Greenbrier types

Chesapeake and Ohio class J-1 4-8-2
Chesapeake and Ohio class J-2 4-8-2
Chesapeake and Ohio class J-3 and J-3-A 4-8-4

Class K: 2-8-2 and 2-8-4[edit]

C&O's 'Big Mike' #2705, a 2-8-4 Class K-4 'Kanawha' built by Alco in 1943, at the B&O Railroad Museum in 2008

Class K was used for 2-8-2 Mikado and 2-8-4 Kanawha types

Chesapeake and Ohio class K ex-Hocking Valley Railway 2-8-2
Chesapeake and Ohio class K-1 2-8-2
Chesapeake and Ohio class K-2 2-8-2
Chesapeake and Ohio classes K-3 and K-3-A 2-8-2
Chesapeake and Ohio class K-4 2-8-4
Chesapeake and Ohio class K-5 ex-Pere Marquette Railway 2-8-2
Chesapeake and Ohio class K-6 ex-Pere Marquette Railway 2-8-2
Chesapeake and Ohio class K-8 ex-Pere Marquette Railway 2-8-2

Class L: 4-6-4[edit]

C&O L-1 class

Class L was used for 4-6-4 'Hudson' types.

Class M: Steam-Turbine-Electric[edit]

Class M was used for a single class of 2-C1+2-C1-2 Steam-turbine electric locomotives.

Class N: 2-8-4[edit]

Chesapeake and Ohio class N ex-Pere Marquette Railway 2-8-4
Chesapeake and Ohio class N-1 ex-Pere Marquette Railway 2-8-4
Chesapeake and Ohio class N-2 ex-Pere Marquette Railway 2-8-4

Class T: 2-10-4[edit]

Class T was used for a single class of 2-10-4 'Texas' types

Diesel locomotives[edit]

ALCO[edit]

S-2 58 engines built 1949–1950
S-4 14 engines built 1953
RS-2 2 engines built 1949, and later sold to Lehigh Valley Railroad
RSD-5 26 engines built 1952
RS-1 2 engines built 1953
RS-3 2 engines built 1955
RSD-12 10 engines built 1956
RSD-7 12 engines built 1956, retired and traded to GE 1969
C-630 4 engines built 1967, and later sold to Robe River Mining of Australia

Baldwin[edit]

DRS-6-6-1500 3 engines built 1949
AS-616 39 engines built 1950–1953

EMD[edit]

Switchers

NW2 35 built for the C&O
SW7 26 built for the C&O
SW9 35 built for the C&O
TR3 Cow-Calf-Calf 2 sets built in 1949
TR4 Cow-Calf 2 sets built and operated together for use on the Dawkins Sub. out of Paintsville, KY.

Passenger Cab units

E8A 31 built for the C&O

Freight Cab units

F7A 94 built for the C&O
F7B 54 built for the C&O
FP7 16 built for the C&O

Road Switchers

C# Programming Cheat Sheet

General Purpose (GP) 4 Axle

GP7 180 built for the C&O
GP9 363 Built for the C&O
GP30 48 Built for the C&O
GP35 41 Built for the C&O
GP38 60 Built for the C&O
GP39 20 Built for the C&O
GP40 50 Built for the C&O

Special Duty (SD) 6 Axle Affinity photo 2020.

SD18 19 Built for the C&O
SD35 14 Built for the C&O
SD40 59 Built for the C&O
SD50 43 Built for the C&O