XFEExtension / .NetCore

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Description

XFEExtension is a C# DLL library designed to optimize common statements in C# code and provide more concise access patterns, rapid server/client setup, a free ChatGPT API interface, a free communication server, an XFE downloader, new formats, and more.

Purpose

The XFEExtension library is suitable for a wide variety of C# projects, especially when improving code readability is a priority. It includes extension methods for many common operations, making code writing more efficient and straightforward. Here are some examples of what XFEExtension can do:

• Simplify code access: XFEExtension provides cleaner syntax, making access operations in your code clearer and more readable.

• Optimize performance: With XFEExtension you can perform various performance-optimization operations to improve application efficiency.

• Accelerate development: By reducing boilerplate code, XFEExtension speeds up project development while improving code maintainability.

Examples (remember to add the appropriate using directives)

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Lazy JSON navigation and serialization

XFEJson.Parse does not parse the complete document when the root node is created. A container is scanned only when it is queried, and unvisited descendants are not materialized or decoded.

Query objects and arrays

using XFEExtension.NetCore.XFETransform.Json;
using XFEExtension.NetCore.StringExtension.Json;

XFEJsonNode json = """
                   {
                     "status": 200,
                     "data": {
                       "items": [
                         { "id": 1, "text": "first", "unused": { "large": true } },
                         { "id": 2, "text": "second" }
                       ]
                     }
                   }
                   """;

var status = json["status"]?.GetInt32();
var secondId = (json > "data" > "items" > 1 > "id")?.GetInt64();
var projections = json["data"]!["items"]!.ProjectArray("id", "text");

Missing properties and out-of-range array indexes return null. Read scalar values with typed APIs such as GetString, GetInt32, GetDouble, and GetBoolean.

Serialize and deserialize

var model = XFEJson.Deserialize<MyModel>(jsonText);
var jsonText = XFEJson.Serialize(model, new XFEJsonOptions
{
    PropertyNamingPolicy = XFEJsonPropertyNamingPolicy.CamelCase,
    WriteIndented = true
});

// Extension forms are also available: model.ToJson(), jsonText.FromJson<MyModel>()

Lazy navigation guarantees only that visited fragments are valid. Call XFEJson.Validate(jsonText) or XFEJson.TryValidate(jsonText, out var error) when the whole input must be checked first. The old QueryableJsonNode and package:* APIs remain available in 5.x but are obsolete.

Using LANDeviceDetector to detect all devices on the local network

Basic usage

var lANDeviceDetector = new LANDeviceDetector();
lANDeviceDetector.DeviceFind += (sender) =>
{
    Console.WriteLine($"IP: {sender.IPAddress}\tDevice name: {sender.DeviceName}");
};
await lANDeviceDetector.StartDetecting();

Custom scan subnet

var lANDeviceDetector = new LANDeviceDetector("100.73.121.*"); // scans 100.73.121.1 – 100.73.121.255
lANDeviceDetector.DeviceFind += (sender) =>
{
    Console.WriteLine($"IP: {sender.IPAddress}\tDevice name: {sender.DeviceName}");
};
await lANDeviceDetector.StartDetecting();

Custom timeout

var lANDeviceDetector = new LANDeviceDetector("100.73.121.*", 2000); // sets timeout to 2000 ms
lANDeviceDetector.DeviceFind += (sender) =>
{
    Console.WriteLine($"IP: {sender.IPAddress}\tDevice name: {sender.DeviceName}");
};
await lANDeviceDetector.StartDetecting();

---

Using the X method to analyze object information and simplify debugging

Output to console (console applications only)

var testClass = new TestClass("Test Name", "Test Description", 15); // the object you want to analyze
testClass.X(); // prints all information about the object to the console

Output to trace/debug output (all C# application types)

var testClass = new TestClass("Test Name", "Test Description", 15); // the object you want to analyze
testClass.XL(); // writes all information about the object to the debug trace output

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XFE ChatGPT usage examples

Simplest usage

// Ask GPT and receive a reply
var result = await XFEChatGPT.SendAndGetGPTResponse("Hello");
Console.WriteLine(result);

General usage

// Use XFEChatGPT for interactive GPT conversations
XFEChatGPT xFEChatGPT = new XFEChatGPT("You are an AI assistant", true);

// Subscribe to events
xFEChatGPT.XFEChatGPTMessageReceived += (sender, e) =>
{
    switch (e.GenerateState)
    {
        case GenerateState.Start:
            Console.Write("[Generation started] ChatGPT:");
            break;
        case GenerateState.Continue:
            Console.Write(e.Message);
            break;
        case GenerateState.End:
            Console.WriteLine("[Generation complete]");
            break;
        case GenerateState.Error:
            Console.WriteLine($"[Error] {e.Message}");
            break;
        default:
            break;
    }
};

// Read the user's question
var askContent = Console.ReadLine();

// Send with a random message ID
xFEChatGPT.SendGPTMessage(Guid.NewGuid().ToString(), askContent);

Recommended usage

// Create a MemorableXFEChatGPT object with conversation memory
MemorableXFEChatGPT memorableXFEChatGPT = new MemorableXFEChatGPT();

// Create a new dialog and set the system message
memorableXFEChatGPT.CreateDialog("dialog-id", "You are an AI assistant developed by XFEstudio", true, true);

// Subscribe to the message-received event
memorableXFEChatGPT.XFEChatGPTMessageReceived += (sender, e) =>
{
    switch (e.GenerateState)
    {
        case GenerateState.Start:
            Console.Write("[Generation started] ChatGPT:");
            break;
        case GenerateState.Continue:
            Console.Write(e.Message);
            break;
        case GenerateState.End:
            Console.WriteLine("[Generation complete]");
            break;
        case GenerateState.Error:
            Console.WriteLine($"[Error] {e.Message}");
            break;
        default:
            break;
    }
};

// Read the user's question
var askContent = Console.ReadLine();

// Send using the dialog ID created above, a random message ID, and the question
memorableXFEChatGPT.AskChatGPT("dialog-id", Guid.NewGuid().ToString(), askContent);

---

IO stream extension examples

// Simplify file read/write operations with XFEExtension
"Hello World!".WriteIn("test.txt");
string txt = "test.txt".ReadOut();

---

XEA encryption algorithm example

// Encrypt and decrypt text using XFEExtension
string text = "This is text that will be encrypted";
$"Plain text: {text}".CW();
string password = "my-secret-key";
string encrypt = text.XEAEncrypt(password); // encrypt
Console.WriteLine("Encrypted: " + encrypt);
Console.WriteLine("Decrypted: " + encrypt.XEADecrypt(password)); // decrypt

---

Attribute access example

// Simplify attribute reading with XFEExtension
string str = testObject.GetAttribute<string>();

---

Testing framework moved to its own package

Starting with XFEExtension.NetCore 5.0, the testing framework is provided by the XFEExtension.NetCore.XUnit 4.0 package. The base extension package no longer defines XFECode, CTest, MTest, or SMTest.

Use [Test], [TestCase], [Benchmark], and Assert from the dedicated package.

---

Quickly set up a network communication server

public class CustomServer
{
    CyberCommServer CyberCommServer { get; } = new("http://127.0.0.1:19019/");
    public async Task StartServer()
    {
        CyberCommServer.ServerStarted += CyberCommServer_ServerStarted;
        CyberCommServer.ConnectionClosed += CyberCommServer_ConnectionClosed;
        CyberCommServer.ClientConnected += CyberCommServer_ClientConnected;
        CyberCommServer.MessageReceived += CyberCommServer_MessageReceived;
        await CyberCommServer.StartCyberCommServer();
    }

    private void CyberCommServer_MessageReceived(object? sender, CyberCommServerEventArgs e)
    {
        e.ReplyMessage("Server received your message");
        Console.WriteLine($"Message from client [{e.IPAddress}]: {e.TextMessage}"); // plain-text example
    }

    private void CyberCommServer_ClientConnected(object? sender, CyberCommServerEventArgs e)
    {
        Console.WriteLine($"New client connected: {e.IPAddress}");
    }

    private void CyberCommServer_ConnectionClosed(object? sender, CyberCommServerEventArgs e)
    {
        Console.WriteLine($"Client [{e.IPAddress}] disconnected");
    }

    private void CyberCommServer_ServerStarted(object? sender, EventArgs e)
    {
        Console.WriteLine("Server started");
    }
}

---

Quickly set up a network communication client

public class CustomClient
{
    CyberCommClient CyberCommClient { get; } = new("http://127.0.0.1:19019/");
    public async Task StartClient()
    {
        CyberCommClient.Connected += CyberCommClient_Connected;
        CyberCommClient.ConnectionClosed += CyberCommClient_ConnectionClosed;
        CyberCommClient.MessageReceived += CyberCommClient_MessageReceived;
        await CyberCommClient.StartCyberCommClient();
    }

    private void CyberCommClient_MessageReceived(object? sender, CyberCommClientEventArgs e)
    {
        Console.WriteLine($"Message received: {e.TextMessage}"); // receive plain-text message
        // reply here if needed:
        // e.ReplyMessage();
    }

    private void CyberCommClient_ConnectionClosed(object? sender, EventArgs e)
    {
        Console.WriteLine("Disconnected from server");
    }

    private void CyberCommClient_Connected(object? sender, EventArgs e)
    {
        Console.WriteLine("Connected to server");
        CyberCommClient.SendTextMessage("This is a test message"); // plain-text example
    }
}

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Build a chat room quickly using the XCC network communication API

XCCNetWork xCCNetWork = new(); // create XCC network base
var group = xCCNetWork.CreateGroup("Test Group", "Member Name"); // create a group, provide group name and member name
#region Subscribe to events
xCCNetWork.Connected += (sender, e) =>
{
    Console.WriteLine($"Group: {e.Group.GroupId}\tConnected");
    group.SendTextMessage("Test message");
};
xCCNetWork.ConnectionClosed += (sender, e) =>
{
    Console.WriteLine($"Group: {e.Group.GroupId}\tDisconnected");
};
xCCNetWork.TextMessageReceived += (sender, e) =>
{
    Console.WriteLine($"Group: {e.Group.GroupId}\tText message received: {e.TextMessage}");
};
#endregion
await group.StartXCC(); // start the group's network communication

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Use XFEDownloader to accelerate file downloads (supports resuming and multi-threaded acceleration)

XFEDownloader xFEDownloader = new()
{
    DownloadUrl = "https://www.nuget.org/api/v2/package/XFEExtension.NetCore/4.1.0",
    SavePath = "XFEExtension.NetCore.nupkg",
    FileSegmentCount = 9 // use 9 threads to accelerate the download (recommended: no more than 15)
};
xFEDownloader.BufferDownloaded += (sender, e) =>
{
    Console.WriteLine($"Progress: {e.DownloadedBufferSize.FileSize()}/{e.TotalBufferSize?.FileSize()}");
};
await xFEDownloader.Download();