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C# Runde auf 2 Dezimalstellen (Funktionsweise für Entwickler)

Q: Wie kann Midpoint-Rounding in C# gesteuert werden?

In C# kann Midpoint-Rounding mithilfe des MidpointRounding -Enums gesteuert werden, das Ihnen ermöglicht, zu definieren, wie Zahlen, die genau zwischen zwei möglichen gerundeten Werten liegen, behandelt werden sollen.

Curtis Chau

Aktualisiert:Juli 28, 2025

Rounding numbers in programming is a common task, especially when you are working with financial data or measurements where precision up to a certain number of decimal places is required. In C#, there are several ways to round a decimal number or double number to two decimal places. This tutorial will explain the concepts clearly and provide you with comprehensive knowledge on how to achieve this precision using C#. We will look into the IronPDF library's capabilities and various methods and functions provided by the C# language to manipulate decimal numbers to a specified precision.

Understanding Decimal and Double Value Types in C#

Before diving into the rounding numbers techniques, it's important to understand the types of numbers we'll be dealing with. In C#, decimal and double are two different types used for numeric values. A decimal variable is typically used when the highest level of precision is needed, for example in financial calculations. On the other hand, a double result is used where floating-point calculations are sufficient and performance is a more critical factor than the exact precision. Both these types can be rounded using specific methods in the C# library.

Using Math.Round to Round to Two Decimal Places

The Math.Round method is the most straightforward approach to round decimal values or double values to a specified number of decimal places. You can also use this math function to round double values to the nearest integer. This Math.Round method is versatile as it allows you to specify how many digits you want to retain after the decimal point, and it also lets you choose the rounding strategy if the number is exactly halfway between two intervals.

Rounding a Decimal Value to Decimal Places

To round a decimal number to two decimal places, you can use the Math.Round method that takes two parameters: the number to be rounded and the number of decimal places. Here is a simple example:

decimal d = 3.14519M; // decimal number
// Round the decimal value to two decimal places
decimal roundedValue = Math.Round(d, 2);
Console.WriteLine(roundedValue);  // Outputs: 3.15

decimal d = 3.14519M; // decimal number
// Round the decimal value to two decimal places
decimal roundedValue = Math.Round(d, 2);
Console.WriteLine(roundedValue);  // Outputs: 3.15

Dim d As Decimal = 3.14519D ' decimal number
' Round the decimal value to two decimal places
Dim roundedValue As Decimal = Math.Round(d, 2)
Console.WriteLine(roundedValue) ' Outputs: 3.15

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In this example, the decimal value 3.14519 is rounded to 3.15. The method Math.Round takes the decimal d and rounds it to two decimal places.

C# Round to 2 Decimal Places (How It Works For Developers): Figure 1 - Rounding to Two Decimal Places Example Output

Rounding a Double Value

Rounding a double value works similarly to rounding a decimal value. Here’s the code on how you can round a double number to two decimal places:

double num = 3.14519;
// Round the double value to two decimal places
double result = Math.Round(num, 2);
Console.WriteLine(result);  // Output: 3.15

double num = 3.14519;
// Round the double value to two decimal places
double result = Math.Round(num, 2);
Console.WriteLine(result);  // Output: 3.15

Dim num As Double = 3.14519
' Round the double value to two decimal places
Dim result As Double = Math.Round(num, 2)
Console.WriteLine(result) ' Output: 3.15

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This code snippet effectively rounds the double number 3.14519 to the nearest value with two decimal places, 3.15. The second argument for Math.Round specifies that the rounding should be done to two decimal places.

Handling Midpoint Rounding

One important aspect of rounding is how to handle cases where the number is exactly at the midpoint between two possible rounded values. C# provides an option to specify the rounding behavior through the MidpointRounding enum. This allows for control over the rounding direction in such cases.

double midpointNumber = 2.345; // double value
// Round with a strategy that rounds midpoints away from zero
double midpointResult = Math.Round(midpointNumber, 2, MidpointRounding.AwayFromZero);
Console.WriteLine(midpointResult);  // Outputs: 2.35

double midpointNumber = 2.345; // double value
// Round with a strategy that rounds midpoints away from zero
double midpointResult = Math.Round(midpointNumber, 2, MidpointRounding.AwayFromZero);
Console.WriteLine(midpointResult);  // Outputs: 2.35

Dim midpointNumber As Double = 2.345 ' double value
' Round with a strategy that rounds midpoints away from zero
Dim midpointResult As Double = Math.Round(midpointNumber, 2, MidpointRounding.AwayFromZero)
Console.WriteLine(midpointResult) ' Outputs: 2.35

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C# Round to 2 Decimal Places (How It Works For Developers): Figure 2 - Midpoint Rounding to 2 Decimal Output

In the above example, MidpointRounding.AwayFromZero instructs the method to round the midpoint number 2.345 to the nearest number away from zero, resulting in 2.35. This is particularly useful in financial calculations where rounding up is commonly used.

Using IronPDF with C# to Round Numbers and Generate PDFs

C# Round to 2 Decimal Places (How It Works For Developers): Figure 3 - IronPDF

IronPDF is a comprehensive PDF generation library specifically designed for the .NET platform and written in C#. It is well-regarded for its ability to create high-quality PDFs by rendering HTML, CSS, and JavaScript, and images. This capability ensures that developers can leverage their existing web development skills for PDF generation. IronPDF utilizes a Chrome rendering engine to produce pixel-perfect PDF documents, mirroring the layout seen in web browsers.

The key feature of IronPDF is its HTML to PDF conversion capabilities, ensuring that your layouts and styles are preserved. It converts web content into PDFs, suitable for reports, invoices, and documentation. You can easily convert HTML files, URLs, and HTML strings to PDFs.

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");
    }
}

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

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IronPDF can be seamlessly integrated with C# to handle precise tasks, such as rounding decimals to two decimal places before embedding them in a PDF. This is especially useful in financial reports or invoices where numerical accuracy is important.

Example: Generating a PDF with Rounded Decimal Values

In this example, we will create a simple C# application that uses IronPDF to generate a PDF document containing a list of numbers rounded to two decimal places. This demonstrates how you can integrate numeric computations with PDF generation in a real-world scenario.

First, you'll need to install IronPDF. You can do this via NuGet:

Install-Package IronPdf

Once IronPDF is installed, here's how you can create a PDF from HTML content, including numbers that have been rounded to two decimal places:

using IronPdf;
using System;

class Program
{
    static void Main()
    {
        // Make sure to set the license key if using a trial or licensed version
        License.LicenseKey = "License-Key";

        var Renderer = new ChromePdfRenderer();

        // Sample data that might come from a database or computation
        double initialValue = 2.345678;
        double roundedValue = Math.Round(initialValue, 2);

        // HTML content including the rounded value
        var htmlContent = $@"
            <html>
            <head>
                <title>PDF Report</title>
            </head>
            <body>
                <h1>Financial Report</h1>
                <p>Value after rounding: {roundedValue}</p>
            </body>
            </html>";

        // Convert HTML to PDF
        var pdfDocument = Renderer.RenderHtmlAsPdf(htmlContent);
        pdfDocument.SaveAs("Report.pdf");

        Console.WriteLine("PDF generated successfully.");
    }
}

using IronPdf;
using System;

class Program
{
    static void Main()
    {
        // Make sure to set the license key if using a trial or licensed version
        License.LicenseKey = "License-Key";

        var Renderer = new ChromePdfRenderer();

        // Sample data that might come from a database or computation
        double initialValue = 2.345678;
        double roundedValue = Math.Round(initialValue, 2);

        // HTML content including the rounded value
        var htmlContent = $@"
            <html>
            <head>
                <title>PDF Report</title>
            </head>
            <body>
                <h1>Financial Report</h1>
                <p>Value after rounding: {roundedValue}</p>
            </body>
            </html>";

        // Convert HTML to PDF
        var pdfDocument = Renderer.RenderHtmlAsPdf(htmlContent);
        pdfDocument.SaveAs("Report.pdf");

        Console.WriteLine("PDF generated successfully.");
    }
}

Imports IronPdf
Imports System

Friend Class Program
	Shared Sub Main()
		' Make sure to set the license key if using a trial or licensed version
		License.LicenseKey = "License-Key"

		Dim Renderer = New ChromePdfRenderer()

		' Sample data that might come from a database or computation
		Dim initialValue As Double = 2.345678
		Dim roundedValue As Double = Math.Round(initialValue, 2)

		' HTML content including the rounded value
		Dim htmlContent = $"
            <html>
            <head>
                <title>PDF Report</title>
            </head>
            <body>
                <h1>Financial Report</h1>
                <p>Value after rounding: {roundedValue}</p>
            </body>
            </html>"

		' Convert HTML to PDF
		Dim pdfDocument = Renderer.RenderHtmlAsPdf(htmlContent)
		pdfDocument.SaveAs("Report.pdf")

		Console.WriteLine("PDF generated successfully.")
	End Sub
End Class

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C# Round to 2 Decimal Places (How It Works For Developers): Figure 4 - PDF Output

This example shows how you can combine the precision of C# mathematical operations with the document generation capabilities of IronPDF to create detailed and accurate PDF reports. Whether it’s a financial summary, a technical report, or any other document where numeric accuracy is important, this method will make sure that your data is presented clearly and correctly.

Conclusion

C# Round to 2 Decimal Places (How It Works For Developers): Figure 5 - Licensing

Rounding numbers to a specified number of decimal places is a fundamental aspect of dealing with decimal and double values in C#. In this tutorial, we explored how to round to two decimal places using the Math.Round function. We also discussed how to handle situations where the number falls right in the middle of two numbers that could be rounded to. IronPDF offers a free trial on their licensing page for developers to explore its features before making a purchase. If you decide it's the right tool for your needs, licensing for commercial use starts at $799.

Häufig gestellte Fragen

Was ist der effektivste Weg, um Zahlen in C# auf zwei Dezimalstellen zu runden?

Der effektivste Weg, um Zahlen in C# auf zwei Dezimalstellen zu runden, ist die Verwendung der Math.Round-Methode, mit der Sie die Anzahl der Dezimalstellen und die Rundungsstrategie angeben können.

Warum Dezimalzahlen gegenüber Double für finanzielle Berechnungen in C# wählen?

Dezimalzahlen werden gegenüber Doubles für finanzielle Berechnungen in C# aufgrund ihrer höheren Präzision bevorzugt, was entscheidend für den Umgang mit Geld und anderen präzisen numerischen Operationen ist.

Wie kann Midpoint-Rounding in C# gesteuert werden?

In C# kann Midpoint-Rounding mithilfe des MidpointRounding-Enums gesteuert werden, das Ihnen ermöglicht, zu definieren, wie Zahlen, die genau zwischen zwei möglichen gerundeten Werten liegen, behandelt werden sollen.

Wie kann HTML-Inhalt in C# in PDF umgewandelt werden?

Sie können HTML-Inhalt in C# mit IronPDF in PDF umwandeln, das HTML-Strings, Dateien und Webseiten effizient in qualitativ hochwertige PDFs rendert und das ursprüngliche Layout und den Stil beibehält.

Was ist erforderlich, um eine C#-Bibliothek zur PDF-Erstellung zu verwenden?

Um IronPDF zur Erstellung von PDFs in C# zu verwenden, müssen Sie das IronPDF-Paket über NuGet installieren, das die notwendigen Werkzeuge für die Erstellung und Bearbeitung von PDF bietet.

Welche Methoden können verwendet werden, um gerundete Zahlen in ein PDF zu integrieren?

Sie können IronPDF verwenden, um gerundete Zahlen in ein PDF zu integrieren, indem Sie zuerst Ihre Zahlen mit Math.Round runden und sie dann nahtlos in Ihren PDF-Inhalt einfügen.

Was sind die Vorteile der Verwendung von IronPDF zur Dokumentenerstellung in C#?

IronPDF ist vorteilhaft für die Dokumentenerstellung in C#, da es die Umwandlung von HTML in PDF unter Wahrung der Styles ermöglicht, verschiedene Webstandards unterstützt und die Einbettung präziser nummerischer Daten erlaubt.

Wie kann ich die richtige Rundungsstrategie in Finanzanwendungen sicherstellen?

Um die richtige Rundungsstrategie in Finanzanwendungen sicherzustellen, verwenden Sie MidpointRounding.AwayFromZero mit Math.Round, was Zwischenpunktwerte von Null weg rundet und mit Standardfinanzrundungspraktiken übereinstimmt.

Was sollte beim Speichern einer PDF-Datei in C# beachtet werden?

Beim Speichern einer PDF-Datei in C#, die mit IronPDF erstellt wurde, ist es wichtig, die SaveAs-Methode zu verwenden, den gewünschten Dateipfad anzugeben und dafür zu sorgen, dass die Datei für die vorgesehenen Nutzer zugänglich ist.

Wie funktioniert die Lizenzierung für die Verwendung von IronPDF in kommerziellen Projekten?

Für die kommerzielle Nutzung von IronPDF müssen Sie eine Lizenz erwerben, die in verschiedenen Stufen erhältlich ist. Auch eine kostenlose Testversion ist für Entwickler verfügbar, um die Fähigkeiten der Software vor dem Kauf zu bewerten.

Curtis Chau

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Technischer Autor

Curtis Chau hat einen Bachelor-Abschluss in Informatik von der Carleton University und ist spezialisiert auf Frontend-Entwicklung mit Expertise in Node.js, TypeScript, JavaScript und React. Leidenschaftlich widmet er sich der Erstellung intuitiver und ästhetisch ansprechender Benutzerschnittstellen und arbeitet gerne mit modernen Frameworks sowie der Erstellung gut strukturierter, optisch ansprechender ...