c# Flashcards
c#: To create a class, type
class ClassName
{
}
c#: To write a method that doesnt return anything, type
static void MethodName()
{
}
c#: the first mandatory method called in any script is
static void Main()
{
}
c#: To create a comment, type
//
c#: .NET is
the library ecosystem that c# can import and use
c#: You must end all lines with a
;
c#: A common compiler for c# is
mono
c#: You can compile c# scripts using mono by typing
mcs ScriptName.cs
c#: You run c# scripts on mac or linux, type
mono ScriptName.exe
c#: To initialize a string variable, type
string varName = “string”;
c#: To write to the console, type
System.Console.Write(“string”);
System.Console.WriteLine(“string”);
c#: To get input into the console, type
System.Console.ReadLine();
c#: Methods are
capitalized
c#: Method calls in c# require you to
call the namespace, then the class, then the method
NameSpaceName.ClassName.MethodName();
c#: To set the namespace, type
namespace NameSpaceName
{
}
c#: To avoid having to write the namespace, type
using NameSpaceName
note: No ;
c#: Namespaces can be named
NameSpaceName.NameSpaceName.NameSpaceName
c#: To enter the c# repl, type
csharp
c#: The types are
int
double
string
c#: To convert a number string into an int, type
int.Parse(“10”)
c#: types can also have
methods.
e. g.
int. Parse(“10”)
c#: To initialize a variable with a boolean value, type
bool varName = false;
c#: To create a while loop, type
bool varName = true;
while(varName == true)
{
Console.WriteLine(“string”);
}
c#: To create an if else statement, type
if (varName == "string") {
...
}
else
{
...
}c#: To create an if, else if, else statement, type
if (varName == "string") {
...
}
else if
{
...
}
else
{
...
}c#: To make a loop start back from the beginning, type
continue;
c#: To create a try catch statement, type
try
{
}
catch(ExceptionName)
{
}
c#: variables are only
accessible from within the curly brackets they were declared in. Not in parallel or parent brackets, only child brackets.
c#: To convert a string to lower case, type
stringVar.ToLower()
c#: The type that can hold decimals is
double
c#: To declare a double, type
double varName = 10.0;
c#: To make a variable available in parent brackets
declare the variable in them and just initialize it in the child brackets
c#: Any equation using both an int and a double returns
a double
c#: Any equation of two ints will return
an int
c#: To cast an double into an int, type
(int)(10.0)
c#: Casting a number does not
round it. It truncates.
c#: To create a variable without declaring it’s type, type
var varName = 0;
c#: DNX stands for
the .Net execution environment
c#: When debugging always ensure that
all lines end with ;
c#: To add references in Xamarin
Hover over the References folder
Click gear button
In the menu click “add references”
c#: “using” statements automatically
call the dispose function on the object after it is used
c#: To send an http get request, type
using System;
using System.Net;
using System.IO;
using System.Net.Http;
using (WebClient client = new WebClient())
{
htmlCode = client.DownloadString("http://site.com");
}
c#: To initialize an int array var with array values, type
int[] varName = new int[5] {1,2,3,4,5}
or
var varName = new int[5] {1,2,3,4,5}
