C# Reverse String（對於開發者的運行原理）

public class Program
{
    // Main method: entry point of the program
    public static void Main()
    {
        string original = "AwesomeIronPDF"; // String variable
        char[] charArray = original.ToCharArray(); // Convert string to character array
        Array.Reverse(charArray); // Reverse the character array
        string reversed = new string(charArray); // Create a new reversed string
        Console.WriteLine(reversed); // Output: FDPnorIemosewA
    }
}

Public Class Program
	' Main method: entry point of the program
	Public Shared Sub Main()
		Dim original As String = "AwesomeIronPDF" ' String variable
		Dim charArray() As Char = original.ToCharArray() ' Convert string to character array
		Array.Reverse(charArray) ' Reverse the character array
		Dim reversed As New String(charArray) ' Create a new reversed string
		Console.WriteLine(reversed) ' Output: FDPnorIemosewA
	End Sub
End Class

public class Program
{
    // Main method: entry point of the program
    public static void Main()
    {
        string someText = "AwesomeIronPDF"; // String variable
        StringBuilder sb = new StringBuilder(); // Create a StringBuilder instance
        for (int i = someText.Length - 1; i >= 0; i--)
        {
            sb.Append(someText[i]); // Append characters in reverse order
        }
        string reversed = sb.ToString(); // Convert StringBuilder to string
        Console.WriteLine(reversed); // Output: FDPnorIemosewA
    }
}

Public Class Program
	' Main method: entry point of the program
	Public Shared Sub Main()
		Dim someText As String = "AwesomeIronPDF" ' String variable
		Dim sb As New StringBuilder() ' Create a StringBuilder instance
		For i As Integer = someText.Length - 1 To 0 Step -1
			sb.Append(someText.Chars(i)) ' Append characters in reverse order
		Next i
		Dim reversed As String = sb.ToString() ' Convert StringBuilder to string
		Console.WriteLine(reversed) ' Output: FDPnorIemosewA
	End Sub
End Class

public class Program
{
    // Main method: entry point of the program
    public static void Main()
    {
        string someText = "AwesomeIronPDF"; // Random string
        string reversed = ReverseString(someText); // Reverse a string
        Console.WriteLine(reversed); // Output: FDPnorIemosewA
    }

    // Recursive method to reverse a string
    public static string ReverseString(string str) 
    {
        if (str.Length <= 1)
            return str;
        return ReverseString(str.Substring(1)) + str[0]; // Recursive call and string concatenation
    }
}

Public Class Program
	' Main method: entry point of the program
	Public Shared Sub Main()
		Dim someText As String = "AwesomeIronPDF" ' Random string
		Dim reversed As String = ReverseString(someText) ' Reverse a string
		Console.WriteLine(reversed) ' Output: FDPnorIemosewA
	End Sub

	' Recursive method to reverse a string
	Public Shared Function ReverseString(ByVal str As String) As String
		If str.Length <= 1 Then
			Return str
		End If
		Return ReverseString(str.Substring(1)) + str.Chars(0) ' Recursive call and string concatenation
	End Function
End Class

using IronPdf;

class Program
{
    // Main method: entry point of the program
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer(); // Create a PDF renderer

        // 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); // Render HTML to PDF
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf"); // Save the PDF file

        // 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); // Render HTML file to PDF
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf"); // Save the PDF file

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

Imports IronPdf

Friend Class Program
	' Main method: entry point of the program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer() ' Create a PDF renderer

		' 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) ' Render HTML to PDF
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf") ' Save the PDF file

		' 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) ' Render HTML file to PDF
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf") ' Save the PDF file

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

public class Program
{
    // Main method: entry point of the program
    public static void Main()
    {
        var content = "<h1>Demonstrate IronPDF with C# LinkedList</h1>";
        content += "<h2>1. Using Array.Reverse Method</h2>";
        string someText = "AwesomeIronPDF"; // New string variable
        content += $"<p>Input String: {someText}</p>";
        char[] charArray = someText.ToCharArray(); // Convert string to character array
        Array.Reverse(charArray); // Reverse the character array
        string reversed1 = new string(charArray); // Create a new reversed string
        Console.WriteLine(reversed1); // Output: FDPnorIemosewA
        content += $"<p>Output: {reversed1}</p>";
        content += "<h2>2. Using StringBuilder</h2>";
        StringBuilder sb = new StringBuilder(); // Create a StringBuilder instance
        content += $"<p>Input String: {someText}</p>";
        for (int i = someText.Length - 1; i >= 0; i--)
        {
            sb.Append(someText[i]); // Append characters in reverse order
        }
        string reversed2 = sb.ToString(); // Convert StringBuilder to string
        Console.WriteLine(reversed2); // Output: FDPnorIemosewA
        content += $"<p>Output: {reversed2}</p>";
        content += "<h2>3. Using Recursive Approach</h2>";
        content += $"<p>Input String: {someText}</p>";
        string reversed3 = ReverseString(someText); // Reverse a string
        Console.WriteLine(reversed3); // Output: FDPnorIemosewA
        content += $"<p>Output: {reversed3}</p>";
        // Create Renderer
        var renderer = new ChromePdfRenderer(); // Create a PDF renderer
        // Create a PDF from HTML string
        var pdf = renderer.RenderHtmlAsPdf(content); // Render HTML to PDF
        // Save to a file or Stream
        pdf.SaveAs("reverseString.pdf"); // Save the PDF file
    }

    // Recursive method to reverse a string
    public static string ReverseString(string str)
    {
        if (str.Length <= 1)
            return str;
        return ReverseString(str.Substring(1)) + str[0]; // Recursive call and string concatenation
    }
}

Public Class Program
	' Main method: entry point of the program
	Public Shared Sub Main()
		Dim content = "<h1>Demonstrate IronPDF with C# LinkedList</h1>"
		content &= "<h2>1. Using Array.Reverse Method</h2>"
		Dim someText As String = "AwesomeIronPDF" ' New string variable
		content &= $"<p>Input String: {someText}</p>"
		Dim charArray() As Char = someText.ToCharArray() ' Convert string to character array
		Array.Reverse(charArray) ' Reverse the character array
		Dim reversed1 As New String(charArray) ' Create a new reversed string
		Console.WriteLine(reversed1) ' Output: FDPnorIemosewA
		content &= $"<p>Output: {reversed1}</p>"
		content &= "<h2>2. Using StringBuilder</h2>"
		Dim sb As New StringBuilder() ' Create a StringBuilder instance
		content &= $"<p>Input String: {someText}</p>"
		For i As Integer = someText.Length - 1 To 0 Step -1
			sb.Append(someText.Chars(i)) ' Append characters in reverse order
		Next i
		Dim reversed2 As String = sb.ToString() ' Convert StringBuilder to string
		Console.WriteLine(reversed2) ' Output: FDPnorIemosewA
		content &= $"<p>Output: {reversed2}</p>"
		content &= "<h2>3. Using Recursive Approach</h2>"
		content &= $"<p>Input String: {someText}</p>"
		Dim reversed3 As String = ReverseString(someText) ' Reverse a string
		Console.WriteLine(reversed3) ' Output: FDPnorIemosewA
		content &= $"<p>Output: {reversed3}</p>"
		' Create Renderer
		Dim renderer = New ChromePdfRenderer() ' Create a PDF renderer
		' Create a PDF from HTML string
		Dim pdf = renderer.RenderHtmlAsPdf(content) ' Render HTML to PDF
		' Save to a file or Stream
		pdf.SaveAs("reverseString.pdf") ' Save the PDF file
	End Sub

	' Recursive method to reverse a string
	Public Shared Function ReverseString(ByVal str As String) As String
		If str.Length <= 1 Then
			Return str
		End If
		Return ReverseString(str.Substring(1)) + str.Chars(0) ' Recursive call and string concatenation
	End Function
End Class