c# - 在 C# 中从磁盘读取短数组的最佳方法？

Question

我必须将 4GB short[] 数组写入磁盘或从磁盘写入，因此我找到了写入数组的函数，但我正在努力编写代码以从磁盘读取数组。我通常使用其他语言编写代码，所以如果到目前为止我的尝试有点可悲，请原谅我:

using UnityEngine;
using System.Collections;
using System.IO;

public class RWShort : MonoBehaviour {

    public static void WriteShortArray(short[] values, string path)
    {
        using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
        {
            using (BinaryWriter bw = new BinaryWriter(fs))
            {
                foreach (short value in values)
                {
                    bw.Write(value);
                }
            }
        }
    } //Above is fine, here is where I am confused: 


    public static short[] ReadShortArray(string path) 
    {
        byte[]  thisByteArray= File.ReadAllBytes(fileName);
        short[] thisShortArray= new short[thisByteArray.length/2];      
                for (int i = 0; i < 10; i+=2)
                {
                    thisShortArray[i]= ? convert from byte array;
                }


        return thisShortArray;
    }   
}

Answer 1

shorts是两个字节，所以每次要读入两个字节。我还建议像这样使用 yield return，这样您就不会试图一次性将所有内容都拉入内存。不过，如果您需要将所有短裤放在一起，那对您没有帮助……我想取决于您用它做什么。

void Main()
{
    short[] values = new short[] {
        1, 999, 200, short.MinValue, short.MaxValue
    };

    WriteShortArray(values, @"C:\temp\shorts.txt");

    foreach (var shortInfile in ReadShortArray(@"C:\temp\shorts.txt"))
    {
        Console.WriteLine(shortInfile);
    }
}

public static void WriteShortArray(short[] values, string path)
{
    using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
    {
        using (BinaryWriter bw = new BinaryWriter(fs))
        {
            foreach (short value in values)
            {
                bw.Write(value);
            }
        }
    }
}

public static IEnumerable<short> ReadShortArray(string path)
{
    using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
    using (BinaryReader br = new BinaryReader(fs))
    {
        byte[] buffer = new byte[2];
        while (br.Read(buffer, 0, 2) > 0)
            yield return (short)(buffer[0]|(buffer[1]<<8)); 
    }
}

您也可以这样定义它，利用 BinaryReader:

public static IEnumerable<short> ReadShortArray(string path)
{
    using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
    using (BinaryReader br = new BinaryReader(fs))
    {
        while (br.BaseStream.Position < br.BaseStream.Length)
            yield return br.ReadInt16();
    }
}