C# 选择案例（开发者用法）

switch (variable)
{
    case value1:
        // action for value1
        break;
    case value2:
        // action for value2
        break;
    default:
        // default action if no case matches
        break;
}

Select Case variable
	Case value1
		' action for value1
	Case value2
		' action for value2
	Case Else
		' default action if no case matches
End Select

using IronPdf;
using System;

public class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine("What do you want to create?");
        Console.WriteLine("a. Report");
        Console.WriteLine("b. Invoice");
        var input = Console.ReadLine();
        string docType;

        if (input == "a")
        {
            GeneratePdf("Report");
        }
        else if (input == "b")
        {
            GeneratePdf("Invoice");
        }
        else
        {
            GeneratePdf(null);
        }
    }

    public static void GeneratePdf(string docType)
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        switch (docType)
        {
            case "Report":
                string reportHtml = "<h1>Report</h1><p>This is a dynamically generated report.</p>";
                PdfDocument reportPdf = renderer.RenderHtmlAsPdf(reportHtml);
                reportPdf.SaveAs("Report.pdf");
                break;
            case "Invoice":
                string invoiceHtml = "<h1>Invoice</h1><p>This is a dynamically generated invoice.</p>";
                PdfDocument invoicePdf = renderer.RenderHtmlAsPdf(invoiceHtml);
                invoicePdf.SaveAs("Invoice.pdf");
                break;
            default:
                string defaultHtml = "<h1>Document</h1><p>This is a default PDF document.</p>";
                PdfDocument defaultPdf = renderer.RenderHtmlAsPdf(defaultHtml);
                defaultPdf.SaveAs("Default.pdf");
                break;
        }
    }
}

Imports IronPdf
Imports System

Public Class Program
	Public Shared Sub Main(ByVal args() As String)
		Console.WriteLine("What do you want to create?")
		Console.WriteLine("a. Report")
		Console.WriteLine("b. Invoice")
		Dim input = Console.ReadLine()
		Dim docType As String

		If input = "a" Then
			GeneratePdf("Report")
		ElseIf input = "b" Then
			GeneratePdf("Invoice")
		Else
			GeneratePdf(Nothing)
		End If
	End Sub

	Public Shared Sub GeneratePdf(ByVal docType As String)
		Dim renderer As New ChromePdfRenderer()
		Select Case docType
			Case "Report"
				Dim reportHtml As String = "<h1>Report</h1><p>This is a dynamically generated report.</p>"
				Dim reportPdf As PdfDocument = renderer.RenderHtmlAsPdf(reportHtml)
				reportPdf.SaveAs("Report.pdf")
			Case "Invoice"
				Dim invoiceHtml As String = "<h1>Invoice</h1><p>This is a dynamically generated invoice.</p>"
				Dim invoicePdf As PdfDocument = renderer.RenderHtmlAsPdf(invoiceHtml)
				invoicePdf.SaveAs("Invoice.pdf")
			Case Else
				Dim defaultHtml As String = "<h1>Document</h1><p>This is a default PDF document.</p>"
				Dim defaultPdf As PdfDocument = renderer.RenderHtmlAsPdf(defaultHtml)
				defaultPdf.SaveAs("Default.pdf")
		End Select
	End Sub
End Class