HashSet C#（開發人員如何使用）

// set operations 
HashSet<int> numbers = new HashSet<int>();
// Add elements
numbers.Add(1);
numbers.Add(2);
numbers.Add(3);
// Remove an element, predicate function
numbers.Remove(2);
// Check for membership or duplicate element
bool containsThree = numbers.Contains(3);

' set operations 
Dim numbers As New HashSet(Of Integer)()
' Add elements
numbers.Add(1)
numbers.Add(2)
numbers.Add(3)
' Remove an element, predicate function
numbers.Remove(2)
' Check for membership or duplicate element
Dim containsThree As Boolean = numbers.Contains(3)

List<int> duplicateNumbers = new List<int> { 1, 2, 2, 3, 3, 4 }; // all the elements
HashSet<int> uniqueNumbers = new HashSet<int>(duplicateNumbers);

Dim duplicateNumbers As New List(Of Integer) From {1, 2, 2, 3, 3, 4} ' all the elements
Dim uniqueNumbers As New HashSet(Of Integer)(duplicateNumbers)

HashSet<int> set1 = new HashSet<int> { 1, 2, 3 };
HashSet<int> set2 = new HashSet<int> { 3, 4, 5 };
set1.UnionWith(set2); // set1 now contains { 1, 2, 3, 4, 5 }

Dim set1 As New HashSet(Of Integer) From {1, 2, 3}
Dim set2 As New HashSet(Of Integer) From {3, 4, 5}
set1.UnionWith(set2) ' set1 now contains { 1, 2, 3, 4, 5 }

HashSet<int> set1 = new HashSet<int> { 1, 2, 3 };
HashSet<int> set2 = new HashSet<int> { 3, 4, 5 };
set1.IntersectWith(set2); // set1 now contains { 3 }

Dim set1 As New HashSet(Of Integer) From {1, 2, 3}
Dim set2 As New HashSet(Of Integer) From {3, 4, 5}
set1.IntersectWith(set2) ' set1 now contains { 3 }

HashSet<int> set1 = new HashSet<int> { 1, 2, 3 };
HashSet<int> set2 = new HashSet<int> { 3, 4, 5 };
set1.ExceptWith(set2); // set1 now contains { 1, 2 }

Dim set1 As New HashSet(Of Integer) From {1, 2, 3}
Dim set2 As New HashSet(Of Integer) From {3, 4, 5}
set1.ExceptWith(set2) ' set1 now contains { 1, 2 }

HashSet<int> set1 = new HashSet<int> { 1, 2, 3 };
HashSet<int> set2 = new HashSet<int> { 2, 3 };
bool isSubset = set2.IsSubsetOf(set1); // returns true
bool isSuperset = set1.IsSupersetOf(set2); // returns true

Dim set1 As New HashSet(Of Integer) From {1, 2, 3}
Dim set2 As New HashSet(Of Integer) From {2, 3}
Dim isSubset As Boolean = set2.IsSubsetOf(set1) ' returns true
Dim isSuperset As Boolean = set1.IsSupersetOf(set2) ' returns true

HashSet<int> set1 = new HashSet<int> { 1, 2, 3 };
HashSet<int> set2 = new HashSet<int> { 3, 4, 5 };
set1.SymmetricExceptWith(set2); // set1 now contains { 1, 2, 4, 5 }

Dim set1 As New HashSet(Of Integer) From {1, 2, 3}
Dim set2 As New HashSet(Of Integer) From {3, 4, 5}
set1.SymmetricExceptWith(set2) ' set1 now contains { 1, 2, 4, 5 }

using IronPdf;

class Program
{
    static void Main(string[] args)
    {
        var renderer = new ChromePdfRenderer();

        // 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);
        pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf");

        // 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);
        pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf");

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

Imports IronPdf

Friend Class Program
	Shared Sub Main(ByVal args() As String)
		Dim renderer = New ChromePdfRenderer()

		' 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)
		pdfFromHtmlString.SaveAs("HTMLStringToPDF.pdf")

		' 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)
		pdfFromHtmlFile.SaveAs("HTMLFileToPDF.pdf")

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

using IronPdf;
using System;
using System.Collections.Generic;
using System.IO;
class PdfGenerator
{
    static void Main()
    {
        // Sample user names
        string [] userNames = { "Alice", "Bob", "Charlie", "Bob", "David", "Alice" };
        // Using HashSet to store unique user names
        HashSet<string> uniqueUserNames = new HashSet<string>(userNames);
        // Generating PDF with unique user names
        GeneratePdf(uniqueUserNames);
    }
    static void GeneratePdf(HashSet<string> uniqueUserNames)
    {
        // Create a new PDF document using IronPDF
        IronPdf.HtmlToPdf renderer = new IronPdf.HtmlToPdf();
        PdfDocument pdf = renderer.RenderHtmlAsPdf(BuildHtmlDocument(uniqueUserNames));
        // Save the PDF to a file
        string pdfFilePath = "UniqueUserNames.pdf";
        pdf.SaveAs(pdfFilePath);
        // Display a message with the file path
        Console.WriteLine($"PDF generated successfully. File saved at: {pdfFilePath}");
    }
    static string BuildHtmlDocument(HashSet<string> uniqueUserNames)
    {
        // Build an HTML document with unique user names
        string htmlDocument = "<html><body><ul>";
        foreach (var userName in uniqueUserNames)
        {
            htmlDocument += $"<li>{userName}</li>";
        }
        htmlDocument += "</ul></body></html>";
        return htmlDocument;
    }
}

Imports IronPdf
Imports System
Imports System.Collections.Generic
Imports System.IO
Friend Class PdfGenerator
	Shared Sub Main()
		' Sample user names
		Dim userNames() As String = { "Alice", "Bob", "Charlie", "Bob", "David", "Alice" }
		' Using HashSet to store unique user names
		Dim uniqueUserNames As New HashSet(Of String)(userNames)
		' Generating PDF with unique user names
		GeneratePdf(uniqueUserNames)
	End Sub
	Private Shared Sub GeneratePdf(ByVal uniqueUserNames As HashSet(Of String))
		' Create a new PDF document using IronPDF
		Dim renderer As New IronPdf.HtmlToPdf()
		Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(BuildHtmlDocument(uniqueUserNames))
		' Save the PDF to a file
		Dim pdfFilePath As String = "UniqueUserNames.pdf"
		pdf.SaveAs(pdfFilePath)
		' Display a message with the file path
		Console.WriteLine($"PDF generated successfully. File saved at: {pdfFilePath}")
	End Sub
	Private Shared Function BuildHtmlDocument(ByVal uniqueUserNames As HashSet(Of String)) As String
		' Build an HTML document with unique user names
		Dim htmlDocument As String = "<html><body><ul>"
		For Each userName In uniqueUserNames
			htmlDocument &= $"<li>{userName}</li>"
		Next userName
		htmlDocument &= "</ul></body></html>"
		Return htmlDocument
	End Function
End Class