C# Coding Reference

Loop Syntax

For
for (int x=0; x < myArr.Length; x++) {
 Console.WriteLine(myArr[x]);
}

For Each
foreach (int a in myArr) {
 total += a;
}

While
while (x < 10) {
 Console.WriteLine("still");
 x++;
}

Do While
do {
 Console.WriteLine("still");
 x++;
} while (x < 10);

Linq Commands

Must include "using System.Linq;" when doing any Linq commands.

• .Select(x=>x)
• .Where(x=>x)
• .OrderBy(x=>x)
• .ThenBy(y=>y)
• .OrderByDescending(x=>x)
• .ThenByDescending(y=>y)
• .ToArray()
• .ToDictionary()
• .ToList()
• .Reverse()
• .Take(n)
• .Max()
• .Min()
• .StartsWith()
• .First()
• .FirstOrDefault()

Declaration Syntax

Functions:
public static bool myFunction(int a, int b) {
 return (a == b);
}

Lists:
List<int> myList = new List<int>();
myList.Add(1);

Arrays:
string[] myArr = new string[] {"cat, "dog", "pig"}
myArr[2] = "hamster";

Visual Studio Shortcuts

• cw - Console.WriteLine
• ctor - Constructor

Reference

• Serialize
• Deserialize
• MVVM Example
• Inversion of Control
• Functional Programming in C#

Libraries/Extensions:

• Autofac - Factory pattern framework
• C5 - Generic Collections Library

Null Operators:

• value = Object?.Property (Null Conditional) - If Object is null, assigns null to value. Otherwise assigns Property to value. Prevents Null Reference exception if Object is null.
• value = Array?[1] (Second Null Conditional) - Returns value at index 1 of the array if it exists, otherwise returns null. Prevents exception if index doesn't exist
• value == Object ?? (Null Coalescing Operator) - Returns Object unless it is null, then it returns 0. Allows setting a default if Object is null.
• myDelegate?.Invoke(args) (Null-conditional Delegate Invocation) - Invokes the delegate if not null.