输出应该是一个大的文本文件,其中每一行都是Number.String,文本是随机的:
347. Bus
20175. Yes Yes
15. The same
2. Hello world
178. Tree
必须以字节为单位指定文件大小。感兴趣的最快的方式,以产生约1000MB的文件和更多。
下面是我生成随机文本的代码:
public string[] GetRandomTextWithIndexes(int size)
{
var result = new string[size];
var sw = Stopwatch.StartNew();
var indexes = Enumerable.Range(0, size).AsParallel().OrderBy(g => GenerateRandomNumber(0, 5)).ToList();
sw.Stop();
Console.WriteLine("Queue fill: " + sw.Elapsed);
sw = Stopwatch.StartNew();
Parallel.For(0, size, i =>
{
var text = GetRandomText(GenerateRandomNumber(1, 20));
result[i] = $"{indexes[i]}. {text}";
});
sw.Stop();
Console.WriteLine("Text fill: " + sw.Elapsed);
return result;
}
public string GetRandomText(int size)
{
var builder = new StringBuilder();
for (var i = 0; i < size; i++)
{
var character = LegalCharacters[GenerateRandomNumber(0, LegalCharacters.Length)];
builder.Append(character);
}
return builder.ToString();
}
private int GenerateRandomNumber(int min, int max)
{
lock (_synlock)
{
if (_random == null)
_random = new Random();
return _random.Next(min, max);
}
}
我不知道如何让这段代码不是字符串的大小,而是MB的大小。当我将size设置为大约1000000000时,我收到OutOfMemoryException
。也许有更快的方法来生成索引
发布于 2018-06-02 01:34:43
之前,无需将所有内容都存储在内存中
using (var fs = File.OpenWrite(@"c:\w\test.txt"))
using (var w = new StreamWriter(fs))
{
for (var i = 0; i < size; i++)
{
var text = GetRandomText(GenerateRandomNumber(1, 20));
var number = GenerateRandomNumber(0, 5);
var line = $"{number}. {text}";
w.WriteLine(line);
}
}
https://stackoverflow.com/questions/50648405
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