根据从C＃写入文件的方式，两个相同的文件具有不同的文件大小

我正在尝试将序列化为JSON格式的对象数组写入文件。我正在尝试以两种不同的方式编写它，如下所示。

I am trying to write to a file an array of object serialised into JSON format. I am trying to write it in two different way as shown below.

ToSerialise[] Obj = new ToSerialise[10];
        for (int i = 0; i < 10; i++)
        {
            Obj[i] = new ToSerialise();
        }

        //First form of serialising
        UnicodeEncoding uniEncoding = new UnicodeEncoding();
        String SerialisedOutput;
        SerialisedOutput = JsonConvert.SerializeObject(Obj, Formatting.Indented);
        FileStream fs1 = new FileStream(@"C:\file1.log", FileMode.CreateNew);
        fs1.Write(uniEncoding.GetBytes(SerialisedOutput), 0, uniEncoding.GetByteCount(SerialisedOutput));
        fs1.Close();

        //Second form of serialising
        FileStream fs2 = new FileStream(@"C:\file2.log", FileMode.CreateNew);
        StreamWriter sw = new StreamWriter(fs2);
        JsonWriter jw = new JsonTextWriter(sw);
        JsonSerializer js = new JsonSerializer();
        jw.Formatting = Formatting.Indented;
        js.Serialize(jw, Obj);
        jw.Close();
        fs2.Close();

即使两个文件的内容相同，它们的文件大小也不同。实际上，第一个文件恰好是第二个文件的两倍。我尝试使用textpad比较输出，并说它们完全一样。为什么它们的文件大小不同？

Even though the content of both the files are same, they have different file size. Actually the first file is exactly twice the size of the second file. I tried comparing the output using textpad and it says they are excatly the same. Why do they have different file size?

我在Windows 7 32位.Net4上运行此文件

I am running this on Windows 7 32 bit, .Net4

谢谢