C# Find功能如何為開發者工作？

C# Find功能允許開發者定位集合、陣列或列表中滿足由謂詞定義的特定條件的第一個元素。此功能有助於簡化編碼過程。

什麼是謂詞，在C#中如何使用？

在C#中，謂詞是一種表示具有特定條件的方法的委派。它用於像 Find 這樣的方法中，測試集合中的每個元素，返回滿足條件的元素。

我可以在C#中使用自定義類別與Find方法一起使用嗎？

是的，您可以使用自定義類別與Find方法一起使用，通過定義匹配該類別元素搜索條件的謂詞，例如發現具有特定屬性值的物件。

如果在Find方法中沒有元素匹配條件會怎麼樣？

如果沒有元素匹配Find方法中由謂詞指定的條件，它將返回預設值，比如對於引用型別為 null ，對於值型別為 0 。

Find和FindAll在C#中的差異是什麼？

Find方法返回第一個匹配謂詞的元素，而FindAll返回滿足謂詞條件的所有元素的列表。

FindIndex和FindLastIndex方法有何不同？

FindIndex返回第一個匹配謂詞的元素的索引，而FindLastIndex返回匹配條件的最後一個元素的索引。

我如何使用C# Find整合PDF程式庫以進行文字搜索？

利用PDF程式庫，您可以從PDF中提取文字，並使用Find方法來搜索文字中特定內容，使其在文件處理中非常有效。

可以使用Find按屬性搜索元素嗎？

是的，您可以根據元素屬性定義謂詞以搜索特定條件，例如定位具有特定ID或屬性的物件。

Find方法對大資料集合的效率如何？

Find方法執行線性搜索，按順序檢查每個元素。雖然簡單直接，但對於非常大的集合來說，它可能不是最有效的，因為它的時間複雜度為O(n)。

PDF程式庫為C#開發者提供了哪些好處？

PDF程式庫提供了強大的PDF處理能力，使開發者可以輕鬆地使用C#提取、操作和搜索PDF內容，從而提高與文件相關的任務效率。

C# PDF程式庫

Explore IronPDF 開始免費試用

HTML 轉 PDF

Online Demo 查看所有程式碼範例

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

開發者更新

C# 查找功能（開發者的工作原理）

Jacob Mellor

Updated: 2025年7月28日

歡迎來到我們的C#實用Find函式教程。您剛剛發現了一個可以簡化您的編碼過程的強大功能。因此，無論您是經驗豐富的程式設計師還是剛剛起步，本教程將引導您了解所有元素，以便開始使用。

查找的基本知識

從根本上說，Find是一個函式，可讓您找到集合、陣列或列表中滿足指定條件的第一個元素。您會問，什麼是謂詞？在程式設計中，謂詞是一個函式，用於測試元素在集合中定義的某些條件。

現在，讓我們深入了解一個公共類別範例。

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

在此程式碼中，BikePart是我們的公共類別，它包含一個公共字串ID以識別每個單車部件。我們重寫了GetHashCode方法以用於比較目的。

使用謂詞應用Find

現在我們有了BikePart類，我們可以建立一個單車部件列表並使用Find來根據它們的ID定位特定部分。讓我們來看以下例子：

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

在此程式碼中，我們建立了四個具有唯一ID的BikePart物件。接下來，我們建立了檢查單車部件是否具有"鏈輪ID"的謂詞findChainRingPredicate。最後，我們使用我們定義的謂詞在我們的單車部件列表上調用Find並將找到的部件ID列印到控制台。

了解謂詞參數

您可能對我們Find方法中的謂詞匹配參數感到好奇。這是您定義Find方法返回一個元素的條件的地方。在我們的情況下，我們希望Find方法返回與"鏈輪ID"匹配的第一個元素。

如果沒有元素滿足您謂詞中定義的條件，Find方法將返回一個預設值。例如，如果您正在使用整數陣列，而您的謂詞未找到匹配項，Find方法將返回'0'，這是C#中整數的預設值。

線性搜索原則

需要注意的是，Find函式在整個陣列、列表或集合中進行線性搜索。這意味著它從第一個元素開始，按順序檢查每個後續元素，直到定位到滿足謂詞的第一個元素出現。

在某些情況下，您可能希望定位滿足謂詞的最後一個元素，而不是第一個。為此，C#提供了FindLast函式。

`FindLastIndex`

就像FindLastIndex方法，分別為您提供匹配條件的第一個和最後一個元素的索引。

讓我們嘗試一個例子：

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

顧名思義，FindAll方法檢索集合中滿足謂詞的所有元素。當您需要根據某些條件篩選元素時會使用它。 FindAll方法返回一個包含所有匹配元素的新列表。

這是一個程式碼範例：

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

將IronPDF引入畫面

我們的C#查找知識可用於PDF內容操作的一個重要領域是使用IronPDF，一個用於PDF處理的強大C#程式庫。

假設我們正在處理包含各種單車部件資訊的PDF文件。通常，我們需要在此內容中定位特定部件。這就是IronPDF和C#查找方法相結合提供強大解決方案的地方。

首先，我們會使用IronPDF來從PDF中提取文字，然後可以使用我們之前學到的FindAll方法定位提取文字中的特定部分。

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

在此程式碼中，我們載入了一個PDF，提取了文字，將其分割成行，然後使用FindAll來定位所有提到'鏈輪ID'的行。

如何在VB.NET中查看PDF文件：圖1

這是一個關於如何在實際場景中與IronPDF一起使用Find方法的基本例子。它演示了C#與強大的程式庫一起使用的實用性和多樣性，這有助於使您的程式設計任務更加簡單和高效。

結論

在本教程中，我們深入探討了C# Find方法及其相關 lang="en">的FindAll。我們探討了它們的用途，探索了一些程式碼範例，並揭示了它們最有效的使用情境。

我們還探索了使用IronPDF程式庫進行PDF操作的世界。同樣地，我們看到了在PDF文件內提取和搜索內容的實際應用中使用Find方法知識的實際應用。

IronPDF提供了免費試用IronPDF的機會，使您可以探索其功能並確定它如何能為您的C#專案帶來益處。如果您決定在試用後繼續使用IronPDF, 授權起價為$999。

Jacob Mellor

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首席技術官

Jacob Mellor是Iron Software的首席技術官，一位在C# PDF技術上開創先河的遠見工程師。作為Iron Software核心程式碼庫的原開發者，他從創立以來就一直在塑造公司的產品架構，與首席執行官Cameron Rimington一起將公司轉變為服務於NASA、特斯拉和全球政府公司的50多名人員的公司。

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