在几秒钟内用 C# 创建一个巨大的虚拟文件 [英] Creating a Huge Dummy File in a Matter of Seconds in C#

问题描述

我想在几秒钟内创建一个巨大的虚拟文件，比如 1~2 GB.这是我用 C# 写的:

I want to create a huge dummy file say 1~2 GBs in matter of seconds. here is what I've written in C#:

file.writeallbytes("filename",new byte[a huge number]);

另一种指示状态的方式，如下所示:

and another way with indicating the status, was like following:

long FSS = din.TotalFreeSpace;
long segments = FSS / 10000;
long last_seg = FSS % 10000;
BinaryWriter br = new BinaryWriter(fs);

for (long i = 0; i < segments; i++)
{
    br.Write(new byte[10000]);

    this.label2.Text = "segments write :" + i.ToString() + "
" + "segments remain :" + ((segments-i)+1).ToString();
    Application.DoEvents();
}
br.Write(new byte[last_seg]);
this.label2.Text += "
Done!";
br.Close();

其中 din 是磁盘信息对象

where din is Disk Information object

使用这两种方法，编写如此大但虚拟的文件需要大约 2 分钟或更长时间.还有其他更快的方法吗?

well with these two approach it takes something like 2 or more minutes to write such a big but dummy file. Is there any other faster way for doing so?

推荐答案

只需创建文件，寻找合适的大偏移量，然后写入单个字节:

Simply create the file, seek to a suitably large offset, and write a single byte:

FileStream fs = new FileStream(@"c:	mphuge_dummy_file", FileMode.CreateNew);
fs.Seek(2048L * 1024 * 1024, SeekOrigin.Begin);
fs.WriteByte(0);
fs.Close();

这将产生一个 2GB 的文件，其内容基本上是不可预测的，这对您来说应该没问题.

This will yield a 2GB file with basically unpredictable contents, which should be fine for your purposes.

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