Выдает ошибку при считывании большого файла

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I need to order according to the text of a line of text reading, when I read the file size of about 100MB in all normal, but when I read the file size is about 300MB when the memory error occurred.

деталь функции как показано ниже:

var filePath = @"D:\junk\test.txt";
var fileSize = new FileInfo(filePath).Length;
var viewSize = fileSize
List<string> rowArray = new List<string>();
using (var mm = MemoryMappedFile.CreateFromFile(filePath, FileMode.Open, null, 0, MemoryMappedFileAccess.Read))
using (var stream = mm.CreateViewStream(0, viewSize, MemoryMappedFileAccess.Read))
using (var reader = new StreamReader(stream, Encoding.UTF8))
{
    rowArray.Add(reader.ReadLine());
}

The rowArray is provided to the LISTVIEW data source, LISTVIEW uses a virtual mode

Что я уже пробовал:

I use the third party software to read the file, whether it is the size of 100MB or 300MB size, everything is normal

Why I don't use this method of File.ReadAllLines is that it takes 28 seconds to read the 300MB file, and the Third party software takes about 10 seconds
So I used the MemoryMappedFile technology, but unfortunately, the 300MB file size out of memory error.

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