C# 查找功能（開發者的工作原理）

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

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

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

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

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 Microsoft.VisualBasic
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)
			Return line.Contains("Chain Ring ID")
		End Function

		' 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 line
	End Sub
End Class