C# 泛型（對於開發者的運行原理）

public class Box<T>
{
    private T data;

    public Box(T data)
    {
        this.data = data;
    }

    public T Data
    {
        get { return data; }
    }
}

Public Class Box(Of T)
'INSTANT VB NOTE: The field data was renamed since Visual Basic does not allow fields to have the same name as other class members:
	Private data_Conflict As T

	Public Sub New(ByVal data As T)
		Me.data_Conflict = data
	End Sub

	Public ReadOnly Property Data() As T
		Get
			Return data_Conflict
		End Get
	End Property
End Class

Box<int> integerBox = new Box<int>(123);
Box<string> stringBox = new Box<string>("Hello");

Dim integerBox As New Box(Of Integer)(123)
Dim stringBox As New Box(Of String)("Hello")

public class Utility
{
    // Swaps two elements by reference using generics
    public static void Swap<T>(ref T lhs, ref T rhs)
    {
        T temp = lhs; // Store lhs in a temporary variable
        lhs = rhs;    // Assign rhs to lhs
        rhs = temp;   // Assign temp (original lhs) to rhs
    }
}

Public Class Utility
	' Swaps two elements by reference using generics
	Public Shared Sub Swap(Of T)(ByRef lhs As T, ByRef rhs As T)
		Dim temp As T = lhs ' Store lhs in a temporary variable
		lhs = rhs ' Assign rhs to lhs
		rhs = temp ' Assign temp (original lhs) to rhs
	End Sub
End Class

int a = 1, b = 2;
Utility.Swap<int>(ref a, ref b);

string first = "world", second = "hello";
Utility.Swap(ref first, ref second);

Dim a As Integer = 1, b As Integer = 2
Utility.Swap(Of Integer)(a, b)

Dim first As String = "world", second As String = "hello"
Utility.Swap(first, second)

public interface IRepository<T>
{
    void Add(T item);
    T GetById(int id);
    IEnumerable<T> GetAll();
}

Public Interface IRepository(Of T)
	Sub Add(ByVal item As T)
	Function GetById(ByVal id As Integer) As T
	Function GetAll() As IEnumerable(Of T)
End Interface

public delegate void Action<T>(T item);

Public Delegate Sub Action(Of T)(ByVal item As T)

public class Result<T>
{
    public bool Success { get; private set; }
    public T Data { get; private set; }
    public string Message { get; private set; }

    public Result(bool success, T data, string message = "")
    {
        Success = success;
        Data = data;
        Message = message;
    }
}

Public Class Result(Of T)
	Private privateSuccess As Boolean
	Public Property Success() As Boolean
		Get
			Return privateSuccess
		End Get
		Private Set(ByVal value As Boolean)
			privateSuccess = value
		End Set
	End Property
	Private privateData As T
	Public Property Data() As T
		Get
			Return privateData
		End Get
		Private Set(ByVal value As T)
			privateData = value
		End Set
	End Property
	Private privateMessage As String
	Public Property Message() As String
		Get
			Return privateMessage
		End Get
		Private Set(ByVal value As String)
			privateMessage = value
		End Set
	End Property

	Public Sub New(ByVal success As Boolean, ByVal data As T, Optional ByVal message As String = "")
		Me.Success = success
		Me.Data = data
		Me.Message = message
	End Sub
End Class

public class PdfOptions<T>
{
    public T Metadata { get; set; }
    public string HtmlContent { get; set; }
}

Public Class PdfOptions(Of T)
	Public Property Metadata() As T
	Public Property HtmlContent() As String
End Class

using IronPdf; // Make sure to include the necessary namespace for IronPDF

public static class PdfGenerator
{
    // Generates a PDF from provided HTML content and options
    public static void GeneratePdf<T>(PdfOptions<T> options)
    {
        // Initialize the IronPDF HtmlToPdf renderer
        var renderer = new ChromePdfRenderer();

        // Optional: Apply any renderer options here, for example, setting the paper size
        renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;

        // Generate the PDF from HTML content
        var pdfDocument = renderer.RenderHtmlAsPdf(options.HtmlContent);

        // Optional: Here, you can use options.Metadata in some way, depending on your generic type T
        // For simplicity, we're just printing the metadata to console if it's of type string
        if (options.Metadata is string metadataString)
        {
            Console.WriteLine($"Metadata: {metadataString}");
        }

        // Save the PDF to a file
        var fileName = $"GeneratedPdf_{DateTime.Now.Ticks}.pdf";
        pdfDocument.SaveAs(fileName);
        Console.WriteLine($"PDF generated and saved as {fileName}");
    }
}

Imports IronPdf ' Make sure to include the necessary namespace for IronPDF

Public Module PdfGenerator
	' Generates a PDF from provided HTML content and options
	Public Sub GeneratePdf(Of T)(ByVal options As PdfOptions(Of T))
		' Initialize the IronPDF HtmlToPdf renderer
		Dim renderer = New ChromePdfRenderer()

		' Optional: Apply any renderer options here, for example, setting the paper size
		renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4

		' Generate the PDF from HTML content
		Dim pdfDocument = renderer.RenderHtmlAsPdf(options.HtmlContent)

		' Optional: Here, you can use options.Metadata in some way, depending on your generic type T
		' For simplicity, we're just printing the metadata to console if it's of type string
		Dim tempVar As Boolean = TypeOf options.Metadata Is String
		Dim metadataString As String = If(tempVar, CStr(options.Metadata), Nothing)
		If tempVar Then
			Console.WriteLine($"Metadata: {metadataString}")
		End If

		' Save the PDF to a file
		Dim fileName = $"GeneratedPdf_{DateTime.Now.Ticks}.pdf"
		pdfDocument.SaveAs(fileName)
		Console.WriteLine($"PDF generated and saved as {fileName}")
	End Sub
End Module

class Program
{
    static void Main(string[] args)
    {
        // Set the license key for IronPDF if needed
        License.LicenseKey = "Your-License-Key-Here";

        // Create PDF options with HTML content and metadata
        var options = new PdfOptions<string>
        {
            HtmlContent = "<h1>Hello, World!</h1><p>This is a test PDF document generated from HTML.</p>",
            Metadata = "Test PDF Title"
        };

        // Generate the PDF using the specified options
        PdfGenerator.GeneratePdf(options);
    }
}

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Set the license key for IronPDF if needed
		License.LicenseKey = "Your-License-Key-Here"

		' Create PDF options with HTML content and metadata
		Dim options = New PdfOptions(Of String) With {
			.HtmlContent = "<h1>Hello, World!</h1><p>This is a test PDF document generated from HTML.</p>",
			.Metadata = "Test PDF Title"
		}

		' Generate the PDF using the specified options
		PdfGenerator.GeneratePdf(options)
	End Sub
End Class