C#でPDFファイルを保存する方法（初心者向けチュートリアル）

private void Save_Click(object sender, EventArgs e)
{
    // Get the file path to save the PDF file.
    string filename = getFilePath();

    // If the file path is not empty or null, proceed with saving the PDF file.
    if (!String.IsNullOrEmpty(filename))
    {
        // Create a new instance of the ChromePdfRenderer class.
        var renderer = new ChromePdfRenderer();

        // Render the file contents of the text box as a PDF document using the ChromePdfRenderer.
        var pdfDocument = renderer.RenderHtmlAsPdf(pdfContent.Text);

        // Save the PDF document to the specified file path using the SaveAs method.
        pdfDocument.SaveAs(filename);

        // Show a message box to indicate that the PDF file has been saved successfully.
        MessageBox.Show("PDF has been saved Successfully!");
    }
}

Private Sub Save_Click(ByVal sender As Object, ByVal e As EventArgs)
	' Get the file path to save the PDF file.
	Dim filename As String = getFilePath()

	' If the file path is not empty or null, proceed with saving the PDF file.
	If Not String.IsNullOrEmpty(filename) Then
		' Create a new instance of the ChromePdfRenderer class.
		Dim renderer = New ChromePdfRenderer()

		' Render the file contents of the text box as a PDF document using the ChromePdfRenderer.
		Dim pdfDocument = renderer.RenderHtmlAsPdf(pdfContent.Text)

		' Save the PDF document to the specified file path using the SaveAs method.
		pdfDocument.SaveAs(filename)

		' Show a message box to indicate that the PDF file has been saved successfully.
		MessageBox.Show("PDF has been saved Successfully!")
	End If
End Sub

public string getFilePath()
{
    // Create a new instance of the SaveFileDialog class.
    SaveFileDialog saveFileDialog1 = new SaveFileDialog();

    // Set the initial directory where the SaveFileDialog will open.
    saveFileDialog1.InitialDirectory = @"D:\";

    // Set the title of the SaveFileDialog.
    saveFileDialog1.Title = "Save the PDF Files";

    // Set the SaveFileDialog to check if the specified path exists.
    saveFileDialog1.CheckPathExists = true;

    // Set the default extension for the file type.
    saveFileDialog1.DefaultExt = ".pdf";

    // Set the filter to display only PDF files or all files.
    saveFileDialog1.Filter = "PDF files (*.pdf)|*.pdf|All files (*.*)|*.*";

    // Set the filter index to display the PDF filter as the default.
    saveFileDialog1.FilterIndex = 2;

    // Set the RestoreDirectory property to true so that the SaveFileDialog
    // restores the current directory before closing.
    saveFileDialog1.RestoreDirectory = true;

    // Show the SaveFileDialog and get the result.
    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
    {
        // If the user clicked the OK button in the SaveFileDialog, return the selected file path.
        return saveFileDialog1.FileName;
    }
    // If the user did not click the OK button, return an empty string.
    return String.Empty;
}

Public Function getFilePath() As String
	' Create a new instance of the SaveFileDialog class.
	Dim saveFileDialog1 As New SaveFileDialog()

	' Set the initial directory where the SaveFileDialog will open.
	saveFileDialog1.InitialDirectory = "D:\"

	' Set the title of the SaveFileDialog.
	saveFileDialog1.Title = "Save the PDF Files"

	' Set the SaveFileDialog to check if the specified path exists.
	saveFileDialog1.CheckPathExists = True

	' Set the default extension for the file type.
	saveFileDialog1.DefaultExt = ".pdf"

	' Set the filter to display only PDF files or all files.
	saveFileDialog1.Filter = "PDF files (*.pdf)|*.pdf|All files (*.*)|*.*"

	' Set the filter index to display the PDF filter as the default.
	saveFileDialog1.FilterIndex = 2

	' Set the RestoreDirectory property to true so that the SaveFileDialog
	' restores the current directory before closing.
	saveFileDialog1.RestoreDirectory = True

	' Show the SaveFileDialog and get the result.
	If saveFileDialog1.ShowDialog() = DialogResult.OK Then
		' If the user clicked the OK button in the SaveFileDialog, return the selected file path.
		Return saveFileDialog1.FileName
	End If
	' If the user did not click the OK button, return an empty string.
	Return String.Empty
End Function