C# 将文件拆分为两个字节数组

Question

因为字节数组的最大值是 2GB，假设我有一个更大的文件，我需要将它转换为字节数组。由于我不能保存整个文件，我应该如何将其转换为两个？

我试过:

long length = new System.IO.FileInfo(@"c:\a.mp4").Length;
int chunkSize = Convert.ToInt32(length / 2); 


byte[] part2;
FileStream fileStream = new FileStream(filepath, FileMode.Open, FileAccess.Read);
try
{
    part2 = new byte[chunkSize];            // create buffer
    fileStream.Read(part2, 0, chunkSize);
}
finally
{
    fileStream.Close();
}

byte[] part3;
fileStream = new FileStream(filepath, FileMode.Open, FileAccess.Read);
try
{
    part3 = new byte[chunkSize];            // create buffer
    fileStream.Read(part3, 5, (int)(length - (long)chunkSize));
}
finally
{
    fileStream.Close();
}

但它不起作用。

有什么想法吗？

Answer 1

您可以使用StreamReader 读取file too large to read into a byte array

const int max = 1024*1024;

public void ReadALargeFile(string file, int start = 0)
{
    FileStream fileStream = new FileStream(file, FileMode.Open,FileAccess.Read);
    using (fileStream)
    {
        byte[] buffer = new byte[max];
        fileStream.Seek(start, SeekOrigin.Begin);
        int bytesRead = fileStream.Read(buffer, start, max);
        while(bytesRead > 0)
        {
            DoSomething(buffer, bytesRead);
            bytesRead = fileStream.Read(buffer, start, max);
        }
    }
}