原创 Javascript - 繼承 Inheritance
繼承關係 /* Java: 1. Instance fields 2. Instance methods 3. Class fields 4. Class methods Java
2020-06-16 08:46:30
原创 python - pip install 不同 python 版本
py -2 -m pip install SomePackage # default Python 2 py -2.7 -m pip install SomePackage # specifically Python 2.7 p
2020-06-16 08:46:30
原创 c# - events 觀察者模式
using System; namespace EventsDemo { class Program { static void Main(string[] args) {
2020-06-16 08:46:30
原创 c# - 文字 中心 旋轉
public static void DrawRotatedTextAt(Graphics gr, float angle, string txt, float x, float y, Font the_font, Br
2020-06-16 08:46:30
原创 Asp.net Core - Custom middleware
public class PrintSomethingMiddleware { private readonly RequestDelegate _next; public PrintSometh
2020-06-16 08:46:30
原创 Javascript - Callback, Promise and Promise Chaining
// 1. Use callback in an async function, call the callback when necessary during the async call. const getValueFunc1 =
2020-06-16 08:46:30
原创 c# - Expression Tree and Why?
https://www.tutorialsteacher.com/linq/expression-tree using System; using System.Linq.Expressions; namespace LambdaEx
2020-06-16 08:46:30
原创 c# - Getting Started with Entity Framework Core: Database-First Development
https://www.codeproject.com/Articles/1209903/Getting-Started-with-Entity-Framework-Core-Databas
2020-06-16 08:46:30
原创 c# - async, await
using System; using System.Threading; using System.Threading.Tasks; namespace AsyncAwaitDemo { public delegate Ta
2020-06-16 08:46:30
原创 c# - struct和class的區別
1. struct不可以有無參數的構造函數 2. 如果struct存在構造函數，所有屬性必須在構造函數中初始化 3. 不可以在struct中直接初始化屬性 4. struct可以不使用new初始化 5. 若struct沒有使用new初始化
2020-06-16 08:46:30
原创 Javascript - JSON.stringify - Circular Structure
let cache = []; let result = JSON.stringify(pool.pool, (key, value) => { if (typeof value === 'object'
2020-06-16 08:46:30
原创 Cassandra learning notes
Installation: https://www.youtube.com/watch?v=EEXtVn3zAqc&list=PLalrWAGybpB-L1PGA-NfFu2uiWHEsdscD&index=3 Commands:
2020-03-05 09:08:48
原创 c# - Asp.net Core Identity - 操作步驟
1. Define a new class, derived from IdentityUser public class AppUser : IdentityUser { public string Displ
2020-02-20 18:12:17
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原创 Using .net core with Sqlite+password
1. 在.net framework下設置Sqlite密碼，訪問數據，重設密碼，刪除密碼。 using System; using System.Data.SQLite; namespace ConsoleApp1 { cla
2020-02-20 18:12:15
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