C# Vitrual Vs Abstract（對於開發者的運行原理）

public class Car : Vehicle
{
    // Override the abstract method
    public override void DisplayInfo()
    {
        Console.WriteLine("This is a car.");
    }

    // Override the virtual method
    public override void StartEngine()
    {
        Console.WriteLine("Car engine started with custom settings.");
    }
}

Public Class Car
	Inherits Vehicle

	' Override the abstract method
	Public Overrides Sub DisplayInfo()
		Console.WriteLine("This is a car.")
	End Sub

	' Override the virtual method
	Public Overrides Sub StartEngine()
		Console.WriteLine("Car engine started with custom settings.")
	End Sub
End Class

public class ElectricCar : Car
{
    // Override the StartEngine method
    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

	' Override the StartEngine method
	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

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
    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
	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