二进制格式化程序替代方案

如果使用BinaryWriter而不是序列化程序,您将获得所需的(最小)大小。
我不确定速度,但试试看。

你得自己写 对于 循环以写入数据,如下所示:

struct Pair
{
    public double X, Y;
}

static void WritePairs(string filename, Pair[] data)
{
    using (var fs = System.IO.File.Create(filename))
    using (var bw = new System.IO.BinaryWriter(fs))
    {
        for (int i = 0; i < data.Length; i++)
        {
            bw.Write(data[i].X);
            bw.Write(data[i].Y);
        }
    }
}

static void ReadPairs(string fileName, Pair[] data)
{
    using (var fs = System.IO.File.OpenRead(fileName))
    using (var br = new System.IO.BinaryReader(fs))
    {
        for (int i = 0; i < data.Length; i++)
        {
            data[i].X = br.ReadDouble();
            data[i].Y = br.ReadDouble();
        }
    }
}

序列化意味着添加元数据以便可以安全地反序列化数据,这就是导致开销的原因。如果您自己序列化数据而不使用任何元数据,则最终会得到16 MB的数据:

foreach (double d in array) {
   byte[] bin = BitConverter.GetBytes(d);
   stream.Write(bin, 0, bin.Length);
}

当然,这意味着您还必须自己反序列化数据:

using (BinaryReader reader = new BinaryReader(stream)) {
   for (int i = 0; i < array.Length; i++) {
      byte[] data = reader.ReadBytes(8);
      array[i] = BitConverter.ToDouble(data, 0);
   }
}

这更多的是一个评论,但对一个人来说太多了。。。我无法复制你的结果。然而,这个结构还有一些额外的开销。

-------------------------------------------------------------------------------
Testing array of structs

Size of double:  8
Size of doubles.bin:  16777244
Size per array item:  8
Milliseconds to serialize:  143
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
Testing array of structs

Size of dd struct:  16
Size of structs.bin:  52428991
Size per array item:  25
Milliseconds to serialize:  9678
-------------------------------------------------------------------------------

代码:

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System.Diagnostics;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            TestDoubleArray();
            TestStructArray();
        }

        private static void TestStructArray()
        {

            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();

            dd[] d1 = new dd[2097152];
            BinaryFormatter f1 = new BinaryFormatter();
            f1.Serialize(File.Create("structs.bin"), d1);

            stopWatch.Stop();

            Debug.WriteLine("-------------------------------------------------------------------------------");
            Debug.WriteLine("Testing array of structs");
            Debug.WriteLine("");
            Debug.WriteLine("Size of dd struct:  " + System.Runtime.InteropServices.Marshal.SizeOf(typeof(dd)).ToString());
            FileInfo fi = new FileInfo("structs.bin");
            Debug.WriteLine("Size of structs.bin:  " + fi.Length.ToString());
            Debug.WriteLine("Size per array item:  " + (fi.Length / 2097152).ToString());
            Debug.WriteLine("Milliseconds to serialize:  " + stopWatch.ElapsedMilliseconds);
            Debug.WriteLine("-------------------------------------------------------------------------------");
        }

        static void TestDoubleArray()
        {
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();

            double[] d = new double[2097152];
            BinaryFormatter f = new BinaryFormatter();
            f.Serialize(File.Create("doubles.bin"), d);

            stopWatch.Stop();

            Debug.WriteLine("-------------------------------------------------------------------------------");
            Debug.WriteLine("Testing array of structs");
            Debug.WriteLine("");
            Debug.WriteLine("Size of double:  " + sizeof(double).ToString());
            FileInfo fi = new FileInfo("test.bin");
            Debug.WriteLine("Size of doubles.bin:  " + fi.Length.ToString());
            Debug.WriteLine("Size per array item:  " + (fi.Length / 2097152).ToString());
            Debug.WriteLine("Milliseconds to serialize:  " + stopWatch.ElapsedMilliseconds);
            Debug.WriteLine("-------------------------------------------------------------------------------");
        }

        [Serializable]
        struct dd
        {
            double a;
            double b;
        }
    }
}