读取大PDF文件时的内存峰值高

var barcodeMetadata = new List<BarcodeResult>();
var pageChunks = Enumerable.Range(1, pdf.PageCount)
    .GroupBy(i => i / 50)
    .Select(g => g.ToArray())
    .ToList();
foreach (var chunk in pageChunks)
{
    var readerOptions = new PdfBarcodeReaderOptions
    {
        ExpectMultipleBarcodes = true,
        ExpectBarcodeTypes = IronBarCode.BarcodeEncoding.AllOneDimensional,
        Speed = ReadingSpeed.Detailed,
        ScanMode = BarcodeScanMode.OnlyDetectionModel,
        DPI = 300,
        PageNumbers = chunk
    };
    Console.WriteLine($"Processing pages: Pages {chunk.First()}-{chunk.Last()}");
    var chunkResult = BarcodeReader.ReadPdf(pdf.Stream, readerOptions);
    if (chunkResult != null && chunkResult.Count > 0)
    {
        barcodeMetadata.AddRange(chunkResult);
    }
    // Optional memory pressure relief
    GC.Collect();
    GC.WaitForPendingFinalizers();
}
Console.WriteLine($"Total barcodes found: {barcodeMetadata.Count}");

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports IronBarCode

Dim barcodeMetadata As New List(Of BarcodeResult)()
Dim pageChunks = Enumerable.Range(1, pdf.PageCount) _
    .GroupBy(Function(i) i \ 50) _
    .Select(Function(g) g.ToArray()) _
    .ToList()

For Each chunk In pageChunks
    Dim readerOptions As New PdfBarcodeReaderOptions With {
        .ExpectMultipleBarcodes = True,
        .ExpectBarcodeTypes = BarcodeEncoding.AllOneDimensional,
        .Speed = ReadingSpeed.Detailed,
        .ScanMode = BarcodeScanMode.OnlyDetectionModel,
        .DPI = 300,
        .PageNumbers = chunk
    }
    Console.WriteLine($"Processing pages: Pages {chunk.First()}-{chunk.Last()}")
    Dim chunkResult = BarcodeReader.ReadPdf(pdf.Stream, readerOptions)
    If chunkResult IsNot Nothing AndAlso chunkResult.Count > 0 Then
        barcodeMetadata.AddRange(chunkResult)
    End If
    ' Optional memory pressure relief
    GC.Collect()
    GC.WaitForPendingFinalizers()
Next

Console.WriteLine($"Total barcodes found: {barcodeMetadata.Count}")