在實際環境中測試
在生產環境中測試無浮水印。
在任何需要的地方都能運作。
排序是任何程式語言中的基本操作,而 C# 的 OrderBy 方法是一個強大的工具,用來排列集合中的元素。無論是處理陣列、列表或其他可枚舉結構,了解如何利用 OrderBy 方法可以大大提高程式碼的可讀性和功能性。
稍後在本文中,我們將介紹 IronPDF 以及我們如何使用 LINQ 的 OrderBy 方法和 IronPDF 來生成格式化和排序的 PDF。
OrderBy
方法是LINQ的一部分 (語言集成查詢) 在 C# 中的庫專門設計用於將元素按升序排序,因為這是排序數據的默認方式,因此不需要升序關鍵字。
在 C# 中,有兩種方法可以應用此方法。通過方法語法或查詢語法。我們將使用方法語法,因為它很簡單:
var sortedCollection = collection.OrderBy(item => item.OrderByProperty);
var sortedCollection = collection.OrderBy(item => item.OrderByProperty);
Dim sortedCollection = collection.OrderBy(Function(item) item.OrderByProperty)
這裡,collection
是您想要排序的 IEnumerable
資源集合,而 OrderByProperty
是您希望對元素進行排序的屬性或表達式。OrderBy
中的 Lambda 表達式擴展方法指定了排序標準。
要進行降冪排序,你可以使用方法語法中的 OrderByDescending
方法:
var sortedCollectionDesc = collection.OrderByDescending(item => item.OrderByProperty);
var sortedCollectionDesc = collection.OrderByDescending(item => item.OrderByProperty);
Dim sortedCollectionDesc = collection.OrderByDescending(Function(item) item.OrderByProperty)
在現實情況中,您經常需要根據多個條件對集合進行排序。OrderBy
可以通過鏈接多個 ThenBy
或 ThenByDescending
調用來實現這一點:
var multiSortedCollection = collection
.OrderBy(item => item.OrderByProperty1)
.ThenByDescending(item => item.OrderByProperty2);
var multiSortedCollection = collection
.OrderBy(item => item.OrderByProperty1)
.ThenByDescending(item => item.OrderByProperty2);
Dim multiSortedCollection = collection.OrderBy(Function(item) item.OrderByProperty1).ThenByDescending(Function(item) item.OrderByProperty2)
在此範例中,集合首先按OrderByProperty1的升序排序,對於具有相同OrderByProperty1值的元素,再按OrderByProperty2的降序排序。
對於更複雜的排序需求,您可以使用自訂比較器。OrderBy
方法允許您傳入一個IComparer
var customSortedCollection = collection.OrderBy(item => item.Property, new CustomComparer());
var customSortedCollection = collection.OrderBy(item => item.Property, new CustomComparer());
Dim customSortedCollection = collection.OrderBy(Function(item) item.Property, New CustomComparer())
這裡,CustomComparer
是一個實現 IComparer
的類別
using System;
using System.Linq;
using System.Collections.Generic;
class Program
{
static void Main()
{
List<int> numbers = new List<int> { 5, 2, 8, 1, 7 };
var sortedNumbers = numbers.OrderBy(num => num);
Console.WriteLine("Sorted Numbers:");
foreach (var number in sortedNumbers)
{
Console.WriteLine(number);
}
}
}
using System;
using System.Linq;
using System.Collections.Generic;
class Program
{
static void Main()
{
List<int> numbers = new List<int> { 5, 2, 8, 1, 7 };
var sortedNumbers = numbers.OrderBy(num => num);
Console.WriteLine("Sorted Numbers:");
foreach (var number in sortedNumbers)
{
Console.WriteLine(number);
}
}
}
Imports System
Imports System.Linq
Imports System.Collections.Generic
Friend Class Program
Shared Sub Main()
Dim numbers As New List(Of Integer) From {5, 2, 8, 1, 7}
Dim sortedNumbers = numbers.OrderBy(Function(num) num)
Console.WriteLine("Sorted Numbers:")
For Each number In sortedNumbers
Console.WriteLine(number)
Next number
End Sub
End Class
在此範例中,使用 OrderBy
將整數列表按升序排列。
using System;
using System.Linq;
using System.Collections.Generic;
class Program
{
static void Main()
{
List<string> names = new List<string> { "Alice", "Charlie", "Bob", "David" };
var sortedNames = names.OrderBy(name => name);
Console.WriteLine("Sorted Names:");
foreach (var name in sortedNames)
{
Console.WriteLine(name);
}
}
}
using System;
using System.Linq;
using System.Collections.Generic;
class Program
{
static void Main()
{
List<string> names = new List<string> { "Alice", "Charlie", "Bob", "David" };
var sortedNames = names.OrderBy(name => name);
Console.WriteLine("Sorted Names:");
foreach (var name in sortedNames)
{
Console.WriteLine(name);
}
}
}
Imports System
Imports System.Linq
Imports System.Collections.Generic
Friend Class Program
Shared Sub Main()
Dim names As New List(Of String) From {"Alice", "Charlie", "Bob", "David"}
Dim sortedNames = names.OrderBy(Function(name) name)
Console.WriteLine("Sorted Names:")
For Each name In sortedNames
Console.WriteLine(name)
Next name
End Sub
End Class
此範例演示了按字母順序對字串列表進行遞增排序。
using System;
using System.Linq;
using System.Collections.Generic;
class Person
{
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
}
class Program
{
static void Main()
{
List<Person> people = new List<Person>
{
new Person { FirstName = "John", LastName = "Doe", Age = 30 },
new Person { FirstName = "Alice", LastName = "Smith", Age = 25 },
new Person { FirstName = "Bob", LastName = "Johnson", Age = 35 }
};
var sortedPeople = people.OrderBy(person => person.Age);
Console.WriteLine("Sorted People by Age:");
foreach (var person in sortedPeople)
{
Console.WriteLine($"{person.FirstName} {person.LastName}, Age: {person.Age}");
}
}
}
using System;
using System.Linq;
using System.Collections.Generic;
class Person
{
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
}
class Program
{
static void Main()
{
List<Person> people = new List<Person>
{
new Person { FirstName = "John", LastName = "Doe", Age = 30 },
new Person { FirstName = "Alice", LastName = "Smith", Age = 25 },
new Person { FirstName = "Bob", LastName = "Johnson", Age = 35 }
};
var sortedPeople = people.OrderBy(person => person.Age);
Console.WriteLine("Sorted People by Age:");
foreach (var person in sortedPeople)
{
Console.WriteLine($"{person.FirstName} {person.LastName}, Age: {person.Age}");
}
}
}
Imports System
Imports System.Linq
Imports System.Collections.Generic
Friend Class Person
Public Property FirstName() As String
Public Property LastName() As String
Public Property Age() As Integer
End Class
Friend Class Program
Shared Sub Main()
Dim people As New List(Of Person) From {
New Person With {
.FirstName = "John",
.LastName = "Doe",
.Age = 30
},
New Person With {
.FirstName = "Alice",
.LastName = "Smith",
.Age = 25
},
New Person With {
.FirstName = "Bob",
.LastName = "Johnson",
.Age = 35
}
}
Dim sortedPeople = people.OrderBy(Function(person) person.Age)
Console.WriteLine("Sorted People by Age:")
For Each person In sortedPeople
Console.WriteLine($"{person.FirstName} {person.LastName}, Age: {person.Age}")
Next person
End Sub
End Class
在此範例中,自定義的 Person 物件列表根據年齡屬性按升序排序。
以下輸出可在控制台中看到
在處理字串屬性時,您可能需要確保不區分大小寫的排序:
var sortedPeopleByName = people.OrderBy(person => person.LastName, StringComparer.OrdinalIgnoreCase);
var sortedPeopleByName = people.OrderBy(person => person.LastName, StringComparer.OrdinalIgnoreCase);
Dim sortedPeopleByName = people.OrderBy(Function(person) person.LastName, StringComparer.OrdinalIgnoreCase)
此範例使用 StringComparer.OrdinalIgnoreCase
根據 LastName
屬性進行不區分大小寫的排序。
雖然 LINQ 提供了一種簡潔的方式來排序集合,但必須考慮性能的影響,特別是對於大型數據集。對於性能至關重要的場景,您可能會考慮其他替代方法,例如使用 List
進行原地排序。.Sort
方法。
IronPDF 是一個來自 的 C# PDF 庫 Iron Software 段落有助於閱讀和生成 PDF 文件。它可以輕鬆地將帶有樣式信息的格式化文件轉換為 PDF。IronPDF 可以輕鬆地從 HTML 字符串生成 PDF,或者它可以從 URL 下載 HTML,然後生成 PDF。
IronPDF 在轉換方面表現出色 HTML轉PDF保存所有佈局和樣式。它可以從各種網頁內容(如報告、發票和文檔)生成PDF。該工具可處理HTML文件、URL以及HTML字串來創建PDF文件。
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
IronPDF 可以透過以下方式安裝 NuGet 套件管理控制台或使用 Visual Studio 套件管理器。
dotnet add package IronPdf
dotnet add package IronPdf
'INSTANT VB TODO TASK: The following line uses invalid syntax:
'dotnet add package IronPdf
您也可以使用 NuGet 套件管理員來安裝 IronPDF,只需在 NuGet 套件管理員的搜索欄中搜索 "ironpdf"。
以下是使用 HTML 字串和 IronPDF 生成器生成 PDF 報告的程式碼
// See https://aka.ms/new-console-template for more information
class Person
{
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
}
class Program
{
static void Main()
{
List<Person> people = new List<Person>
{
new Person { FirstName = "John", LastName = "Doe", Age = 30 },
new Person { FirstName = "Alice", LastName = "Smith", Age = 25 },
new Person { FirstName = "Bob", LastName = "Johnson", Age = 35 }
};
var sortedPeople = people.OrderBy(person => person.Age);
string name = "Sam";
var count = people.Count;
string content = $@"<!DOCTYPE html>
<html>
<body>
<h1>Hello, {name}!</h1>
<p>You have {count} people sorted by Age.</p>
" +
string.Join("\n", sortedPeople.Select(person => $"{person.FirstName} {person.LastName}, Age: {person.Age}"))
+ @"
</body>
</html>";
// Create a new PDF document
var pdfDocument = new ChromePdfRenderer();
pdfDocument.RenderHtmlAsPdf(content).SaveAs("personByAge.pdf");
}
}
// See https://aka.ms/new-console-template for more information
class Person
{
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
}
class Program
{
static void Main()
{
List<Person> people = new List<Person>
{
new Person { FirstName = "John", LastName = "Doe", Age = 30 },
new Person { FirstName = "Alice", LastName = "Smith", Age = 25 },
new Person { FirstName = "Bob", LastName = "Johnson", Age = 35 }
};
var sortedPeople = people.OrderBy(person => person.Age);
string name = "Sam";
var count = people.Count;
string content = $@"<!DOCTYPE html>
<html>
<body>
<h1>Hello, {name}!</h1>
<p>You have {count} people sorted by Age.</p>
" +
string.Join("\n", sortedPeople.Select(person => $"{person.FirstName} {person.LastName}, Age: {person.Age}"))
+ @"
</body>
</html>";
// Create a new PDF document
var pdfDocument = new ChromePdfRenderer();
pdfDocument.RenderHtmlAsPdf(content).SaveAs("personByAge.pdf");
}
}
Imports Microsoft.VisualBasic
' See https://aka.ms/new-console-template for more information
Friend Class Person
Public Property FirstName() As String
Public Property LastName() As String
Public Property Age() As Integer
End Class
Friend Class Program
Shared Sub Main()
Dim people As New List(Of Person) From {
New Person With {
.FirstName = "John",
.LastName = "Doe",
.Age = 30
},
New Person With {
.FirstName = "Alice",
.LastName = "Smith",
.Age = 25
},
New Person With {
.FirstName = "Bob",
.LastName = "Johnson",
.Age = 35
}
}
Dim sortedPeople = people.OrderBy(Function(person) person.Age)
Dim name As String = "Sam"
Dim count = people.Count
Dim content As String = $"<!DOCTYPE html>
<html>
<body>
<h1>Hello, {name}!</h1>
<p>You have {count} people sorted by Age.</p>
" & String.Join(vbLf, sortedPeople.Select(Function(person) $"{person.FirstName} {person.LastName}, Age: {person.Age}")) & "
</body>
</html>"
' Create a new PDF document
Dim pdfDocument = New ChromePdfRenderer()
pdfDocument.RenderHtmlAsPdf(content).SaveAs("personByAge.pdf")
End Sub
End Class
首先,我們從 sortedPeople
生成一個 HTML 字串,該字串按照報告所需的格式,以升序排序。然後我們使用 IronPDF 生成 PDF 文件。我們使用 RenderHtmlAsPdf
方法將 HTML 字串轉換為 PDF 文件。
以下輸出可在 PDF 中查看。
可以從以下位置獲取試用金鑰 這裡這個密鑰需要放置在 appsettings.json。
"IronPdf.LicenseKey": "your license key"
"IronPdf.LicenseKey": "your license key"
'INSTANT VB TODO TASK: The following line uses invalid syntax:
'"IronPdf.LicenseKey": "your license key"
提供您的電子郵件以獲取試用許可證。
OrderBy 方法在 C# 中是一種多功能的工具,用於根據各種準則對集合進行排序。無論是按升序或降序排序,按單一或多個準則排序,還是使用自定義比較器,掌握 OrderBy 方法都可以顯著提高你的程式碼的清晰度和效率。
與 IronPDF, 它是生成格式精美且排序整齊的文檔集合的絕佳組合。