C# on Luna Wen's Blog

Luna Tech | C# Numeric Types (2)

Sun, 31 Jan 2021 19:19:21 +1100

0. 回顾：整数型

short, ushort, byte, sbyte, int, uint, long, ulong

C# Numeric Types (1)

本文基于《C# 8.0 in a nutshell》Chapter 2 的相关内容。

1. Arithmetic Operators 运算符

+ - * / %

所有的 numeric type 都可以使用，除了 8-bit 和 16-bit integer.

Luna Tech | Walk Through C# Types

Sat, 06 Jun 2020 14:00:06 +1000

Slide in HTML version: https://bit.ly/2Ui4dC2

Agenda

C# Types Overview
Value Type and Reference Type
Nullable Type
Structure type and Enumeration type (struct and enum)
Common Questions & Answers
Wrap up

Overview: A diagram of C# Types

This tutorial will cover most of the terms in the diagram, but we are not going to dive deep into dynamic type.

Value types

most built-in types (all numeric types, the char type, the bool type)
custom struct types
custom enum types

Reference types

string type
object type (all class, array, delegate, interface types)
dynamic type

2. Value Type and Reference Type

Example of different types

// ** Value Type **

// built-in types
Int32 number = 1;
int i = 0;

// struct
struct Point { public int X; public int Y; }

// enum
enum Color { Red, Green, Blue };

// ** Reference Type **

// string type
string s = "abc";
string[] stringArray = ["a", "b", "c"];
List<string> stringList = new List<string>();

// object type
Student student = new Student();
List<Student> studentList = new List<Student>(); // Object List

// dynamic type
dynamic dynamicVariable = 1;

Simple Types (Built-in value types)

Luna Tech | Dive into C# Pattern Matching

Fri, 29 May 2020 14:28:23 +1000

Slide in HTML version: https://bit.ly/3etbRRH

Agenda

Introduction
Pattern Matching in C# 7
Pattern Matching in C# 8
Pattern Matching in C# 9
Wrap up

Pattern Matching

1. What is Pattern Matching?

Pattern matching is a feature that allows you to implement method on both object properties and object type.

2. Pattern Matching in C# 7.0

The “is” Pattern
“switch” supports Type Pattern
The “when” Pattern
Cases can be grouped

C# 7.0: The “is” pattern

var input = 1;
var sum = 0;

if (input is int count)
    sum += count;

Console.WriteLine(sum); // 1

C# 7.0: The “is” pattern - Example

Before