C# 虚拟与抽象（开发人员如何运作）

public abstract class Vehicle
{
// abstract method to be implemented in non abstract child class
    public abstract void DisplayInfo();
}

Public MustInherit Class Vehicle
' abstract method to be implemented in non abstract child class
	Public MustOverride Sub DisplayInfo()
End Class

// non abstract class
public class Animal
{
    public virtual void Speak()
    {
        Console.WriteLine("Some generic animal sound");
    }
}

' non abstract class
Public Class Animal
	Public Overridable Sub Speak()
		Console.WriteLine("Some generic animal sound")
	End Sub
End Class

public abstract class Vehicle
{
    // Abstract method
    public abstract void DisplayInfo();
    // Virtual method
    public virtual void StartEngine()
    {
        Console.WriteLine("Engine started with default configuration.");
    }
}

Public MustInherit Class Vehicle
	' Abstract method
	Public MustOverride Sub DisplayInfo()
	' Virtual method
	Public Overridable Sub StartEngine()
		Console.WriteLine("Engine started with default configuration.")
	End Sub
End Class

public class Car : Vehicle
{
// public override void abstractmethod
    public override void DisplayInfo()
    {
        Console.WriteLine("This is a car.");
    }
    public override void StartEngine()
    {
        Console.WriteLine("Car engine started with custom settings.");
    }
}

Public Class Car
	Inherits Vehicle

' public override void abstractmethod
	Public Overrides Sub DisplayInfo()
		Console.WriteLine("This is a car.")
	End Sub
	Public Overrides Sub StartEngine()
		Console.WriteLine("Car engine started with custom settings.")
	End Sub
End Class

public class ElectricCar : Car
{
    public override void StartEngine()
    {
        base.StartEngine(); // Call the base class implementation
        Console.WriteLine("Electric car engine started with energy-saving mode.");
    }
}

Public Class ElectricCar
	Inherits Car

	Public Overrides Sub StartEngine()
		MyBase.StartEngine() ' Call the base class implementation
		Console.WriteLine("Electric car engine started with energy-saving mode.")
	End Sub
End Class

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();

        // 1. Convert HTML String to PDF
        var htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>";
        var pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent);
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf");

        // 2. Convert HTML File to PDF
        var htmlFilePath = "path_to_your_html_file.html"; // Specify the path to your HTML file
        var pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath);
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf");

        // 3. Convert URL to PDF
        var url = "http://ironpdf.com"; // Specify the URL
        var pdfFromUrl = renderer.RenderUrlAsPdf(url);
        pdfFromUrl.SaveAs("URLToPDF.pdf");
    }
}

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer()

		' 1. Convert HTML String to PDF
		Dim htmlContent = "<h1>Hello, IronPDF!</h1><p>This is a PDF from an HTML string.</p>"
		Dim pdfFromHtmlString = renderer.RenderHtmlAsPdf(htmlContent)
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf")

		' 2. Convert HTML File to PDF
		Dim htmlFilePath = "path_to_your_html_file.html" ' Specify the path to your HTML file
		Dim pdfFromHtmlFile = renderer.RenderHtmlFileAsPdf(htmlFilePath)
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf")

		' 3. Convert URL to PDF
		Dim url = "http://ironpdf.com" ' Specify the URL
		Dim pdfFromUrl = renderer.RenderUrlAsPdf(url)
		pdfFromUrl.SaveAs("URLToPDF.pdf")
	End Sub
End Class

public abstract class PdfReportGenerator
{
    // Use abstract method to force derived classes to implement their custom PDF generation logic.
    public abstract void GenerateReport(string filePath);
    // A virtual function allows derived classes to override the default implementation of PDF setup.
    public virtual void SetupPdfGenerator()
    {
        // Default PDF setup logic that can be overridden by derived classes.
        IronPdf.Installation.TempFolderPath = @"F:\TempPdfFiles";
    }
}
public class MonthlyReportGenerator : PdfReportGenerator
{
    // Override abstract method to provide specific implementation using override modifier.
    public override void GenerateReport(string filePath)
    {
        var pdf = new ChromePdfRenderer();
        pdf.RenderHtmlAsPdf("<h1>Monthly Report</h1> <p>Add Your report content here....</p>").SaveAs(filePath);
    }
    // Optionally override the virtual method to customize the setup.
    public override void SetupPdfGenerator()
    {
        base.SetupPdfGenerator();
        // Additional setup logic specific to monthly reports.
        IronPdf.Installation.TempFolderPath = @"F:\MonthlyReports";
    }
}
class Program
{
    static void Main(string [] args)
    {
        License.LicenseKey = "License-Key";
        PdfReportGenerator reportGenerator = new MonthlyReportGenerator();
        reportGenerator.SetupPdfGenerator();
        reportGenerator.GenerateReport(@"F:\MonthlyReports\MonthlyReport.pdf");
        Console.WriteLine("Report generated successfully.");
    }
}

Public MustInherit Class PdfReportGenerator
	' Use abstract method to force derived classes to implement their custom PDF generation logic.
	Public MustOverride Sub GenerateReport(ByVal filePath As String)
	' A virtual function allows derived classes to override the default implementation of PDF setup.
	Public Overridable Sub SetupPdfGenerator()
		' Default PDF setup logic that can be overridden by derived classes.
		IronPdf.Installation.TempFolderPath = "F:\TempPdfFiles"
	End Sub
End Class
Public Class MonthlyReportGenerator
	Inherits PdfReportGenerator

	' Override abstract method to provide specific implementation using override modifier.
	Public Overrides Sub GenerateReport(ByVal filePath As String)
		Dim pdf = New ChromePdfRenderer()
		pdf.RenderHtmlAsPdf("<h1>Monthly Report</h1> <p>Add Your report content here....</p>").SaveAs(filePath)
	End Sub
	' Optionally override the virtual method to customize the setup.
	Public Overrides Sub SetupPdfGenerator()
		MyBase.SetupPdfGenerator()
		' Additional setup logic specific to monthly reports.
		IronPdf.Installation.TempFolderPath = "F:\MonthlyReports"
	End Sub
End Class
Friend Class Program
	Shared Sub Main(ByVal args() As String)
		License.LicenseKey = "License-Key"
		Dim reportGenerator As PdfReportGenerator = New MonthlyReportGenerator()
		reportGenerator.SetupPdfGenerator()
		reportGenerator.GenerateReport("F:\MonthlyReports\MonthlyReport.pdf")
		Console.WriteLine("Report generated successfully.")
	End Sub
End Class