Check existence
Check whether a Key exists in Redis IDatabase.KeyExists(string key)Purpose: Check whether the specified key exists in Redis It returns true as long as the key exists, works for all data …
Read value
Redis Get Value Examples Notes Read value
Write value
StackExchange.Redis Generic Set / Get for write‑and‑read operations Required namespaces The example below uses Set, accepts a key, byte array, and expiration duration. Notes The earlier WinForms sample used hard‑coded …
Connect to Redis
This lesson demonstrates Redis operations inside WinForms. The logic applies to other project types; WinForms is used only for demonstration purposes. After you install Redis, it runs as an independent …
Demonstrate Redis with WinForms
This section covers C# WinForms Redis cache wrapper based on StackExchange.Redis Open Visual Studio, create a WinForms project, then install dependency packages via NuGet Install Dependencies Redis Wrapper Methods Demonstrate …
Installation
Windows Redis 3.2.100 Installation and Startup Download Links Core Files After Extraction File Purpose redis‑server.exe Redis server program redis‑cli.exe Redis command‑line client tool redis.windows.conf Default configuration file redis.windows‑service.conf Dedicated config …
Introduction
Redis Basic Definition Redis is an open‑source software written in ANSI C, network‑accessible key‑value database / storage system that supports in‑memory storage and data persistence. It provides client APIs for …
Escape characters and #if conditionals
Backslash Escape + #if Conditional Syntax 1. Backslash \ Escape Rules Pre‑defined variable：#set($dog = “woof woof”) VTL Code Rendered Output Explanation $dog woof woof Normal variable resolution \$dog $dog Single …
Extension methods
1. Backend Person Entity Code (C#) Set object variables in C# backend code 2. VTL Template Code & Rendering Notes 1. $pTest.getMyName() ✅ Velocity parameter‑less method call: parentheses () can …
Supplementary notes on variable boundaries
Variable preset: #set ($valok = “hello foxdevelop”) Variable Boundary ${} vs . Access Distinction Code Rendered Output Explanation $valok hello foxdevelop Basic variable output $valok.com hello foxdevelop.com Velocity tries to …
Iterate collections
Velocity #foreach Iterate over Collections & Objects 1. Iterate over String List C# Back‑end Code Velocity Template Code Execution result: Loop through each string in the list and output with …
Comments
1. Distinction of Template Comments Syntax Type Features <!– HTML comment –> Native HTML comment Output to final webpage source code, visible when viewing page source in browser ## Single‑line …
Template reuse
1. Core Purpose The Velocity template engine achieves template reuse via #include / #parse.Common webpage sections such as page header navigation _head.htm and footer copyright _footer.htm can be extracted into …
Define variables inside templates
The variables covered so far are defined in C# code‑behind files and then consumed in templates. In fact, you can define variables directly inside templates using the set directive. 1. …
Fundamental template syntax
1. Pass Entity Objects to Templates 1.1 PageInfo Entity Class Previously we passed simple strings, which is inefficient and hard‑to‑maintain. Wrapping data into entity objects makes code much clearer. 1.2 …
Array serialization and deserialization
Example Notes ① Serialize List to JSON array string ② Deserialize JSON‑array string to List Array serialization and deserialization
Serialization and deserialization
Let’s recap serialization from the previous section, which converts an entity object into a JSON string. Serialization Generated JSON output Deserialization Convert a JSON string back to an entity object …
Introduction
1. Introduction to Newtonsoft.Json Newtonsoft.Json (commonly known as Json.NET) is an open‑source JSON serialization/deserialization library for the .NET ecosystem 2. What is JSON JSON（JavaScript Object Notation） II. Define Entity Classes …
Other Operations
1. FlushAll() Clear Cache Key Notes 2. TryGet Safe Cache Retrieval Get() vs TryGet() Method Characteristics Use‑case mClient.Get(key) Returns null for missing keys; cannot tell apart a null‑valued cache entry …
Object Persistence
In this lesson, we will learn how to store class objects, including object storage and retrieval. This code demonstrates Memcached storing primitive types (int/bool) and custom Class objects, and highlights …