C# 查找函数对开发人员如何工作？

C# 查找函数允许开发人员找到集合、数组或列表中第一个满足特定条件的元素。此功能对简化编码过程很有用。

什么是谓词，在 C# 中如何使用？

在 C# 中，谓词是一个表示具有特定条件的方法的委托。它用于诸如 Find 等方法来测试集合中的每个元素，返回满足条件的元素。

我可以在 C# 中将查找方法与自定义类一起使用吗？

是的，您可以通过定义一个匹配自定义类元素搜索条件的谓词来使用查找方法，例如找到具有特定属性值的对象。

如果在查找方法中没有元素匹配条件，会发生什么？

如果在 Find 方法中没有元素符合谓词指定的条件，则返回默认值，例如引用类型的 null 或值类型的 0 。

Find 和 FindAll 在 C# 中有什么区别？

Find 方法返回第一个符合谓词的元素，而 FindAll 返回所有满足谓词条件的元素列表。

FindIndex 和 FindLastIndex 方法有何不同？

FindIndex 返回第一个符合谓词元素的索引，而 FindLastIndex 返回最后一个符合条件元素的索引。

如何将 PDF 库与 C# Find 集成进行文本搜索？

通过使用 PDF 库，您可以从 PDF 中提取文本并利用查找方法在文本中搜索特定内容，从而提高文档处理的效率。

是否可以使用 Find 根据元素的属性进行搜索？

是的，您可以根据元素属性定义谓词来搜索特定条件，例如找到具有特定 ID 或属性的对象。

Find 方法对于大型数据集合有多高效？

Find 方法执行线性搜索，按顺序检查每个元素。虽然简单，但它可能不是非常大型集合中最有效的，因为它的复杂度是 O(n)。

对于 C# 开发人员来说，PDF 库有什么好处？

PDF 库提供了强大的 PDF 处理能力，允许开发人员轻松提取、操作和搜索 PDF 内容，利用 C# 提高文档相关任务的效率。

C# PDF库

Explore IronPDF 免费试用

HTML到PDF

Online Demo 查看所有%s代码示例

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

PM >Install-Package IronPdf

Install-Package IronPdf

开发者更新

C# 查找（开发者如何使用）

Jacob Mellor

Updated: 2025年7月28日

欢迎来到我们的教程，讲述C#的便捷Find函数。您刚刚发现了一个可以简化编码过程的强大功能。因此，无论您是经验丰富的程序员还是刚刚入门，本教程都将引导您了解所有元素以帮助您启动。

Find 的基础

在其核心，Find是一个函数，允许您在集合、数组或列表中定位满足特定谓词的第一个元素。你问什么是谓词？在编程中，谓词是用于测试集合中元素的某些条件的函数。

现在，让我们深入了解一个公共类的示例。

public class BikePart
{
    public string Id { get; set; } // Property to identify the bike part

    // Override the Equals method to specify how to compare two BikePart objects
    public override bool Equals(object obj)
    {
        if (obj == null || !(obj is BikePart))
            return false;

        return this.Id == ((BikePart)obj).Id;
    }

    // Override GetHashCode for hashing BikePart objects
    public override int GetHashCode()
    {
        return this.Id.GetHashCode();
    }

    // Override ToString to return a custom string representation of the object
    public override string ToString()
    {
        return "BikePart ID: " + this.Id;
    }
}

public class BikePart
{
    public string Id { get; set; } // Property to identify the bike part

    // Override the Equals method to specify how to compare two BikePart objects
    public override bool Equals(object obj)
    {
        if (obj == null || !(obj is BikePart))
            return false;

        return this.Id == ((BikePart)obj).Id;
    }

    // Override GetHashCode for hashing BikePart objects
    public override int GetHashCode()
    {
        return this.Id.GetHashCode();
    }

    // Override ToString to return a custom string representation of the object
    public override string ToString()
    {
        return "BikePart ID: " + this.Id;
    }
}

Public Class BikePart
	Public Property Id() As String ' -  Property to identify the bike part

	' Override the Equals method to specify how to compare two BikePart objects
	Public Overrides Function Equals(ByVal obj As Object) As Boolean
		If obj Is Nothing OrElse Not (TypeOf obj Is BikePart) Then
			Return False
		End If

		Return Me.Id = DirectCast(obj, BikePart).Id
	End Function

	' Override GetHashCode for hashing BikePart objects
	Public Overrides Function GetHashCode() As Integer
		Return Me.Id.GetHashCode()
	End Function

	' Override ToString to return a custom string representation of the object
	Public Overrides Function ToString() As String
		Return "BikePart ID: " & Me.Id
	End Function
End Class

Public Class BikePart
	Public Property Id() As String ' -  Property to identify the bike part

	' Override the Equals method to specify how to compare two BikePart objects
	Public Overrides Function Equals(ByVal obj As Object) As Boolean
		If obj Is Nothing OrElse Not (TypeOf obj Is BikePart) Then
			Return False
		End If

		Return Me.Id = DirectCast(obj, BikePart).Id
	End Function

	' Override GetHashCode for hashing BikePart objects
	Public Overrides Function GetHashCode() As Integer
		Return Me.Id.GetHashCode()
	End Function

	' Override ToString to return a custom string representation of the object
	Public Overrides Function ToString() As String
		Return "BikePart ID: " & Me.Id
	End Function
End Class

在此代码中，BikePart是我们的公共类，它包含一个用于标识每个自行车部件的公共字符串ID。我们重写了GetHashCode方法用于比较目的。

使用谓词调用 Find

现在我们有了BikePart类，我们可以创建一个自行车部件列表并使用Find根据它们的ID定位特定部件。考虑以下示例：

using System;
using System.Collections.Generic;

public static void Main()
{
    // Create a list of BikePart objects
    List<BikePart> bikeParts = new List<BikePart>
    {
        new BikePart { Id = "Chain Ring ID" },
        new BikePart { Id = "Crank Arm ID" },
        new BikePart { Id = "Regular Seat ID" },
        new BikePart { Id = "Banana Seat ID" },
    };

    // Define a predicate to find a BikePart with a specific ID
    Predicate<BikePart> findChainRingPredicate = (BikePart bp) => { return bp.Id == "Chain Ring ID"; };
    BikePart chainRingPart = bikeParts.Find(findChainRingPredicate);

    // Print the found BikePart's ID to the console
    Console.WriteLine(chainRingPart.ToString());
}

using System;
using System.Collections.Generic;

public static void Main()
{
    // Create a list of BikePart objects
    List<BikePart> bikeParts = new List<BikePart>
    {
        new BikePart { Id = "Chain Ring ID" },
        new BikePart { Id = "Crank Arm ID" },
        new BikePart { Id = "Regular Seat ID" },
        new BikePart { Id = "Banana Seat ID" },
    };

    // Define a predicate to find a BikePart with a specific ID
    Predicate<BikePart> findChainRingPredicate = (BikePart bp) => { return bp.Id == "Chain Ring ID"; };
    BikePart chainRingPart = bikeParts.Find(findChainRingPredicate);

    // Print the found BikePart's ID to the console
    Console.WriteLine(chainRingPart.ToString());
}

Imports System
Imports System.Collections.Generic

Public Shared Sub Main()
	' Create a list of BikePart objects
	Dim bikeParts As New List(Of BikePart) From {
		New BikePart With {.Id = "Chain Ring ID"},
		New BikePart With {.Id = "Crank Arm ID"},
		New BikePart With {.Id = "Regular Seat ID"},
		New BikePart With {.Id = "Banana Seat ID"}
	}

	' Define a predicate to find a BikePart with a specific ID
	Dim findChainRingPredicate As Predicate(Of BikePart) = Function(bp As BikePart)
		Return bp.Id = "Chain Ring ID"
	End Function
	Dim chainRingPart As BikePart = bikeParts.Find(findChainRingPredicate)

	' Print the found BikePart's ID to the console
	Console.WriteLine(chainRingPart.ToString())
End Sub

Imports System
Imports System.Collections.Generic

Public Shared Sub Main()
	' Create a list of BikePart objects
	Dim bikeParts As New List(Of BikePart) From {
		New BikePart With {.Id = "Chain Ring ID"},
		New BikePart With {.Id = "Crank Arm ID"},
		New BikePart With {.Id = "Regular Seat ID"},
		New BikePart With {.Id = "Banana Seat ID"}
	}

	' Define a predicate to find a BikePart with a specific ID
	Dim findChainRingPredicate As Predicate(Of BikePart) = Function(bp As BikePart)
		Return bp.Id = "Chain Ring ID"
	End Function
	Dim chainRingPart As BikePart = bikeParts.Find(findChainRingPredicate)

	' Print the found BikePart's ID to the console
	Console.WriteLine(chainRingPart.ToString())
End Sub

在此代码中，我们实例化了四个具有唯一ID的BikePart对象。接下来，我们创建一个谓词findChainRingPredicate，该谓词检查一个自行车部件是否具有ID"Chain Ring ID"。最后，我们使用我们定义的谓词在自行车部件列表上调用Find并将找到的部件ID打印到控制台。

理解谓词参数

您可能会对我们的Find方法中的谓词匹配参数感到好奇。这是您定义Find方法返回元素的条件的地方。在我们的例子中，我们希望Find方法返回第一个匹配"Chain Ring ID"的元素。

如果没有元素满足您在谓词中定义的条件，Find方法将返回默认值。例如，如果您正在处理一个整数数组，并且您的谓词未找到匹配项，Find方法将返回'0'，这是C#中整数的默认值。

线性搜索原则

重要的是要注意，Find函数在整个数组、列表或集合中进行线性搜索。这意味着它从第一个元素开始，并按顺序检查每一个后续元素，直到找到满足谓词的第一个元素为止。

在某些情况下，您可能想找到满足谓词的最后一个元素而不是第一个。为此，C#提供了FindLast函数。

`FindLastIndex`

正如FindLastIndex方法，分别为您提供条件匹配的第一个和最后一个元素的索引。

让我们尝试一个示例：

using System;
using System.Collections.Generic;

public static void Main()
{
    // Create a list of BikePart objects with an additional duplicate entry
    List<BikePart> bikeParts = new List<BikePart>
    {
        new BikePart { Id = "Chain Ring ID" },
        new BikePart { Id = "Crank Arm ID" },
        new BikePart { Id = "Regular Seat ID" },
        new BikePart { Id = "Banana Seat ID" },
        new BikePart { Id = "Chain Ring ID" }, // Added a second chain ring
    };

    // Define a predicate to find a BikePart with a specific ID
    Predicate<BikePart> findChainRingPredicate = (BikePart bp) => { return bp.Id == "Chain Ring ID"; };

    // Find the index of the first and last occurrence of the specified BikePart
    int firstChainRingIndex = bikeParts.FindIndex(findChainRingPredicate);
    int lastChainRingIndex = bikeParts.FindLastIndex(findChainRingPredicate);

    // Print the indices to the console
    Console.WriteLine($"First Chain Ring ID found at index: {firstChainRingIndex}");
    Console.WriteLine($"Last Chain Ring ID found at index: {lastChainRingIndex}");
}

using System;
using System.Collections.Generic;

public static void Main()
{
    // Create a list of BikePart objects with an additional duplicate entry
    List<BikePart> bikeParts = new List<BikePart>
    {
        new BikePart { Id = "Chain Ring ID" },
        new BikePart { Id = "Crank Arm ID" },
        new BikePart { Id = "Regular Seat ID" },
        new BikePart { Id = "Banana Seat ID" },
        new BikePart { Id = "Chain Ring ID" }, // Added a second chain ring
    };

    // Define a predicate to find a BikePart with a specific ID
    Predicate<BikePart> findChainRingPredicate = (BikePart bp) => { return bp.Id == "Chain Ring ID"; };

    // Find the index of the first and last occurrence of the specified BikePart
    int firstChainRingIndex = bikeParts.FindIndex(findChainRingPredicate);
    int lastChainRingIndex = bikeParts.FindLastIndex(findChainRingPredicate);

    // Print the indices to the console
    Console.WriteLine($"First Chain Ring ID found at index: {firstChainRingIndex}");
    Console.WriteLine($"Last Chain Ring ID found at index: {lastChainRingIndex}");
}

Imports System
Imports System.Collections.Generic

Public Shared Sub Main()
	' Create a list of BikePart objects with an additional duplicate entry
	Dim bikeParts As New List(Of BikePart) From {
		New BikePart With {.Id = "Chain Ring ID"},
		New BikePart With {.Id = "Crank Arm ID"},
		New BikePart With {.Id = "Regular Seat ID"},
		New BikePart With {.Id = "Banana Seat ID"},
		New BikePart With {.Id = "Chain Ring ID"}
	}

	' Define a predicate to find a BikePart with a specific ID
	Dim findChainRingPredicate As Predicate(Of BikePart) = Function(bp As BikePart)
		Return bp.Id = "Chain Ring ID"
	End Function

	' Find the index of the first and last occurrence of the specified BikePart
	Dim firstChainRingIndex As Integer = bikeParts.FindIndex(findChainRingPredicate)
	Dim lastChainRingIndex As Integer = bikeParts.FindLastIndex(findChainRingPredicate)

	' Print the indices to the console
	Console.WriteLine($"First Chain Ring ID found at index: {firstChainRingIndex}")
	Console.WriteLine($"Last Chain Ring ID found at index: {lastChainRingIndex}")
End Sub

Imports System
Imports System.Collections.Generic

Public Shared Sub Main()
	' Create a list of BikePart objects with an additional duplicate entry
	Dim bikeParts As New List(Of BikePart) From {
		New BikePart With {.Id = "Chain Ring ID"},
		New BikePart With {.Id = "Crank Arm ID"},
		New BikePart With {.Id = "Regular Seat ID"},
		New BikePart With {.Id = "Banana Seat ID"},
		New BikePart With {.Id = "Chain Ring ID"}
	}

	' Define a predicate to find a BikePart with a specific ID
	Dim findChainRingPredicate As Predicate(Of BikePart) = Function(bp As BikePart)
		Return bp.Id = "Chain Ring ID"
	End Function

	' Find the index of the first and last occurrence of the specified BikePart
	Dim firstChainRingIndex As Integer = bikeParts.FindIndex(findChainRingPredicate)
	Dim lastChainRingIndex As Integer = bikeParts.FindLastIndex(findChainRingPredicate)

	' Print the indices to the console
	Console.WriteLine($"First Chain Ring ID found at index: {firstChainRingIndex}")
	Console.WriteLine($"Last Chain Ring ID found at index: {lastChainRingIndex}")
End Sub

`FindAll`的力量

顾名思义，FindAll方法检索集合中所有满足谓词的元素。它用于需要根据某些条件过滤元素时。 FindAll方法返回一个包含所有匹配元素的新列表。

以下是代码示例：

using System;
using System.Collections.Generic;

public static void Main()
{
    // Create a list of BikePart objects with an additional duplicate entry
    List<BikePart> bikeParts = new List<BikePart>
    {
        new BikePart { Id = "Chain Ring ID" },
        new BikePart { Id = "Crank Arm ID" },
        new BikePart { Id = "Regular Seat ID" },
        new BikePart { Id = "Banana Seat ID" },
        new BikePart { Id = "Chain Ring ID" }, // Added a second chain ring
    };

    // Define a predicate to find all BikeParts with a specific ID
    Predicate<BikePart> findChainRingPredicate = (BikePart bp) => { return bp.Id == "Chain Ring ID"; };

    // Use FindAll to get all matching BikePart objects
    List<BikePart> chainRings = bikeParts.FindAll(findChainRingPredicate);

    // Print the count and details of each found BikePart
    Console.WriteLine($"Found {chainRings.Count} Chain Rings:");
    foreach (BikePart chainRing in chainRings)
    {
        Console.WriteLine(chainRing.ToString());
    }
}

using System;
using System.Collections.Generic;

public static void Main()
{
    // Create a list of BikePart objects with an additional duplicate entry
    List<BikePart> bikeParts = new List<BikePart>
    {
        new BikePart { Id = "Chain Ring ID" },
        new BikePart { Id = "Crank Arm ID" },
        new BikePart { Id = "Regular Seat ID" },
        new BikePart { Id = "Banana Seat ID" },
        new BikePart { Id = "Chain Ring ID" }, // Added a second chain ring
    };

    // Define a predicate to find all BikeParts with a specific ID
    Predicate<BikePart> findChainRingPredicate = (BikePart bp) => { return bp.Id == "Chain Ring ID"; };

    // Use FindAll to get all matching BikePart objects
    List<BikePart> chainRings = bikeParts.FindAll(findChainRingPredicate);

    // Print the count and details of each found BikePart
    Console.WriteLine($"Found {chainRings.Count} Chain Rings:");
    foreach (BikePart chainRing in chainRings)
    {
        Console.WriteLine(chainRing.ToString());
    }
}

Imports System
Imports System.Collections.Generic

Public Shared Sub Main()
	' Create a list of BikePart objects with an additional duplicate entry
	Dim bikeParts As New List(Of BikePart) From {
		New BikePart With {.Id = "Chain Ring ID"},
		New BikePart With {.Id = "Crank Arm ID"},
		New BikePart With {.Id = "Regular Seat ID"},
		New BikePart With {.Id = "Banana Seat ID"},
		New BikePart With {.Id = "Chain Ring ID"}
	}

	' Define a predicate to find all BikeParts with a specific ID
	Dim findChainRingPredicate As Predicate(Of BikePart) = Function(bp As BikePart)
		Return bp.Id = "Chain Ring ID"
	End Function

	' Use FindAll to get all matching BikePart objects
	Dim chainRings As List(Of BikePart) = bikeParts.FindAll(findChainRingPredicate)

	' Print the count and details of each found BikePart
	Console.WriteLine($"Found {chainRings.Count} Chain Rings:")
	For Each chainRing As BikePart In chainRings
		Console.WriteLine(chainRing.ToString())
	Next chainRing
End Sub

Imports System
Imports System.Collections.Generic

Public Shared Sub Main()
	' Create a list of BikePart objects with an additional duplicate entry
	Dim bikeParts As New List(Of BikePart) From {
		New BikePart With {.Id = "Chain Ring ID"},
		New BikePart With {.Id = "Crank Arm ID"},
		New BikePart With {.Id = "Regular Seat ID"},
		New BikePart With {.Id = "Banana Seat ID"},
		New BikePart With {.Id = "Chain Ring ID"}
	}

	' Define a predicate to find all BikeParts with a specific ID
	Dim findChainRingPredicate As Predicate(Of BikePart) = Function(bp As BikePart)
		Return bp.Id = "Chain Ring ID"
	End Function

	' Use FindAll to get all matching BikePart objects
	Dim chainRings As List(Of BikePart) = bikeParts.FindAll(findChainRingPredicate)

	' Print the count and details of each found BikePart
	Console.WriteLine($"Found {chainRings.Count} Chain Rings:")
	For Each chainRing As BikePart In chainRings
		Console.WriteLine(chainRing.ToString())
	Next chainRing
End Sub

引入 IronPDF

我们 C# Find 知识可以应用的一个重要领域是使用 IronPDF 进行 PDF 内容操作，IronPDF 是处理 PDF 的强大 C# 库。

假设我们正在处理一个包含各种自行车零件信息的 PDF 文档。通常，我们需要在这些内容中定位特定部件。这就是 IronPDF 和 C# Find 方法结合提供强大解决方案的地方。

首先，我们会使用IronPDF来从PDF中提取文本，然后我们可以使用此前学到的FindAll方法在提取的文本中定位特定部分。

using IronPdf;
using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public static void Main()
    {
        // Load and extract text from a PDF document
        PdfDocument pdf = PdfDocument.FromFile(@"C:\Users\Administrator\Desktop\bike.pdf");
        string pdfText = pdf.ExtractAllText();

        // Split the extracted text into lines
        List<string> pdfLines = pdfText.Split('\n').ToList();

        // Define a predicate to find lines that contain a specific text
        Predicate<string> findChainRingPredicate = (string line) => { return line.Contains("Chain Ring ID"); };
        
        // Use FindAll to get all lines containing the specified text
        List<string> chainRingLines = pdfLines.FindAll(findChainRingPredicate);

        // Print the count and content of each found line
        Console.WriteLine($"Found {chainRingLines.Count} lines mentioning 'Chain Ring ID':");
        foreach (string line in chainRingLines)
        {
            Console.WriteLine(line);
        }
    }
}

using IronPdf;
using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public static void Main()
    {
        // Load and extract text from a PDF document
        PdfDocument pdf = PdfDocument.FromFile(@"C:\Users\Administrator\Desktop\bike.pdf");
        string pdfText = pdf.ExtractAllText();

        // Split the extracted text into lines
        List<string> pdfLines = pdfText.Split('\n').ToList();

        // Define a predicate to find lines that contain a specific text
        Predicate<string> findChainRingPredicate = (string line) => { return line.Contains("Chain Ring ID"); };
        
        // Use FindAll to get all lines containing the specified text
        List<string> chainRingLines = pdfLines.FindAll(findChainRingPredicate);

        // Print the count and content of each found line
        Console.WriteLine($"Found {chainRingLines.Count} lines mentioning 'Chain Ring ID':");
        foreach (string line in chainRingLines)
        {
            Console.WriteLine(line);
        }
    }
}

Imports IronPdf
Imports System
Imports System.Collections.Generic
Imports System.Linq

Public Class Program
    Public Shared Sub Main()
        ' Load and extract text from a PDF document
        Dim pdf As PdfDocument = PdfDocument.FromFile("C:\Users\Administrator\Desktop\bike.pdf")
        Dim pdfText As String = pdf.ExtractAllText()

        ' Split the extracted text into lines
        Dim pdfLines As List(Of String) = pdfText.Split(ControlChars.Lf).ToList()

        ' Define a predicate to find lines that contain a specific text
        Dim findChainRingPredicate As Predicate(Of String) = Function(line As String) line.Contains("Chain Ring ID")

        ' Use FindAll to get all lines containing the specified text
        Dim chainRingLines As List(Of String) = pdfLines.FindAll(findChainRingPredicate)

        ' Print the count and content of each found line
        Console.WriteLine($"Found {chainRingLines.Count} lines mentioning 'Chain Ring ID':")
        For Each line As String In chainRingLines
            Console.WriteLine(line)
        Next
    End Sub
End Class

Imports IronPdf
Imports System
Imports System.Collections.Generic
Imports System.Linq

Public Class Program
    Public Shared Sub Main()
        ' Load and extract text from a PDF document
        Dim pdf As PdfDocument = PdfDocument.FromFile("C:\Users\Administrator\Desktop\bike.pdf")
        Dim pdfText As String = pdf.ExtractAllText()

        ' Split the extracted text into lines
        Dim pdfLines As List(Of String) = pdfText.Split(ControlChars.Lf).ToList()

        ' Define a predicate to find lines that contain a specific text
        Dim findChainRingPredicate As Predicate(Of String) = Function(line As String) line.Contains("Chain Ring ID")

        ' Use FindAll to get all lines containing the specified text
        Dim chainRingLines As List(Of String) = pdfLines.FindAll(findChainRingPredicate)

        ' Print the count and content of each found line
        Console.WriteLine($"Found {chainRingLines.Count} lines mentioning 'Chain Ring ID':")
        For Each line As String In chainRingLines
            Console.WriteLine(line)
        Next
    End Sub
End Class

在此代码中，我们加载了一个PDF，提取了文本，将其拆分为行，然后使用FindAll定位提到'Chain Ring ID'的所有行。

如何在VB.NET中查看PDF文件：图1

这是一个关于如何在实际场景中将Find方法与IronPDF一起使用的基本示例。它展示了 C# 的实用性和多功能性以及其强大的库，有助于让您的编程任务更轻松、更高效。

结论

在本教程中，我们深入研究了C#的FindAll。我们探索了它们的用法，研究了一些代码示例，并介绍了它们最有效的情况。

我们还进入了使用 IronPDF 库进行 PDF 操作的世界。同样，我们看到我们的Find方法知识在提取和搜索PDF文档内容方面的实际应用。

IronPDF 提供免费的试用版 IronPDF，提供了绝佳的机会来探索其功能并确定它如何能够为您的 C# 项目带来好处。如果您决定在试用后继续使用IronPDF，许可证价格开始于$999。

Jacob Mellor

立即与工程团队聊天

首席技术官

Jacob Mellor 是 Iron Software 的首席技术官，也是一位开创 C# PDF 技术的有远见的工程师。作为 Iron Software 核心代码库的原始开发者，他从公司成立之初就开始塑造公司的产品架构，与首席执行官 Cameron Rimington 一起将公司转变为一家拥有 50 多名员工的公司，为 NASA、特斯拉和全球政府机构提供服务。