C# TryParse（對於開發者的運行原理）

string numberStr = "123";
int number;
if (int.TryParse(numberStr, out number))
{
    Console.WriteLine("Parsed number: " + number);
}
else
{
    Console.WriteLine("Invalid number format");
}

Imports System

Dim numberStr As String = "123"
Dim number As Integer
If Integer.TryParse(numberStr, number) Then
    Console.WriteLine("Parsed number: " & number)
Else
    Console.WriteLine("Invalid number format")
End If

using IronPdf;
using System;

class Program
{
    static void Main(string[] args)
    {
        // Prompt the user for input
        Console.WriteLine("Enter a number:");
        // Read user input as a string
        string userInput = Console.ReadLine();
        // Attempt to parse the input as an integer
        if (int.TryParse(userInput, out int parsedNumber))
        {
            // If parsing succeeds, create a PDF document
            var pdf = new HtmlToPdf();
            // Generate HTML content with the parsed number
            string htmlContent = $"<h1>User's Number: {parsedNumber}</h1>";
            // Convert HTML to PDF
            var pdfDoc = pdf.RenderHtmlAsPdf(htmlContent);
            // Save the PDF document to a file
            pdfDoc.SaveAs("parsed_number.pdf");
            Console.WriteLine("PDF generated successfully.");
        }
        else
        {
            // If parsing fails, display an error message
            Console.WriteLine("Invalid number format. Please enter a valid integer.");
        }
    }
}

Imports IronPdf
Imports System

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		' Prompt the user for input
		Console.WriteLine("Enter a number:")
		' Read user input as a string
		Dim userInput As String = Console.ReadLine()
		' Attempt to parse the input as an integer
		Dim parsedNumber As Integer
		If Integer.TryParse(userInput, parsedNumber) Then
			' If parsing succeeds, create a PDF document
			Dim pdf = New HtmlToPdf()
			' Generate HTML content with the parsed number
			Dim htmlContent As String = $"<h1>User's Number: {parsedNumber}</h1>"
			' Convert HTML to PDF
			Dim pdfDoc = pdf.RenderHtmlAsPdf(htmlContent)
			' Save the PDF document to a file
			pdfDoc.SaveAs("parsed_number.pdf")
			Console.WriteLine("PDF generated successfully.")
		Else
			' If parsing fails, display an error message
			Console.WriteLine("Invalid number format. Please enter a valid integer.")
		End If
	End Sub
End Class