如何在C＃中尽可能快地将字符串分为一系列字符串？
简短描述：将字符串拆分到长时间。
更长的描述： 我需要从字符串中提取信息看起来像这样：（
...
5 1 12 1 1 1 466 1277 458 80 92 Assistance
2 1 13 0 0 0 1055 1277 1717 100 -1
3 1 13 1 0 0 1055 1186 1717 191 -1
4 1 13 1 1 0 1055 1277 1717 100 -1
5 1 13 1 1 1 1055 1279 288 78 90 Vehicle
5 1 13 1 1 2 1489 1279 228 98 67 Lights
5 1 13 1 1 3 1856 1281 286 95 74 System
5 1 13 1 1 4 2284 1281 196 95 70 Apps
5 1 13 1 1 5 2618 1277 154 80 77 Info
...
旁注：字符串是作为 page.gettsvtext（0） method的返回而来的。 tesseractengine.process（image）; 注：
为了能够更轻松地使用信息，我编写了一种将字符串变成一系列字符串数组：
private string[][] getDataArray(string source)
{
Stopwatch sw = new Stopwatch();
sw.Start();
Console.WriteLine(source);
string[] rows = source.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
int nrOfRows = rows.Length;
string[][] result = new string[nrOfRows][];
for (int i = 0; i < nrOfRows; i++)
{
result[i] = rows[i].Split(new char[] { ' ', ' ' }, StringSplitOptions.RemoveEmptyEntries);
}
sw.Stop();
Console.WriteLine(" $$$ getDataArray() took: " + sw.ElapsedMilliseconds + " ms");
return result;
}
注：注： 由于某种原因，字符串包含的空间看起来比通常的空间更长。我从控制台日志中拿出了复制纸。它是一个字符，而不是一个选项卡，但比通常的空间char所需的空间/更宽。
问题：
- 当我从内部测量时间该方法时，的时间小于1 ms 。
- 当我从外部测量时间时，如下：
stopwatch.Restart();
// Get data
string[][] data = getDataArray(page.GetTsvText(0));
stopwatch.Stop();
Console.WriteLine(" $$$ $$$ Got data array in: " + stopwatch.ElapsedMilliseconds + " ms");
它需要 2000 ms 。
字符串初始化需要这么长的时间？ 如何更快地获得它，例如50 ms ？
Short description: Splitting a string takes way to long.
Longer description:
I need to extract information from a string looking like this:
...
5 1 12 1 1 1 466 1277 458 80 92 Assistance
2 1 13 0 0 0 1055 1277 1717 100 -1
3 1 13 1 0 0 1055 1186 1717 191 -1
4 1 13 1 1 0 1055 1277 1717 100 -1
5 1 13 1 1 1 1055 1279 288 78 90 Vehicle
5 1 13 1 1 2 1489 1279 228 98 67 Lights
5 1 13 1 1 3 1856 1281 286 95 74 System
5 1 13 1 1 4 2284 1281 196 95 70 Apps
5 1 13 1 1 5 2618 1277 154 80 77 Info
...
(Side Note: the string comes as a return from the page.GetTsvText(0) method; page is a return of TesseractEngine.Process(image); so the string contains information about detected OCR strings, conficendes, bounding boxes coords, etc.)
In order to be able to make easier use of the information, I wrote a method that turns the string into a array of arrays of strings:
private string[][] getDataArray(string source)
{
Stopwatch sw = new Stopwatch();
sw.Start();
Console.WriteLine(source);
string[] rows = source.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
int nrOfRows = rows.Length;
string[][] result = new string[nrOfRows][];
for (int i = 0; i < nrOfRows; i++)
{
result[i] = rows[i].Split(new char[] { ' ', ' ' }, StringSplitOptions.RemoveEmptyEntries);
}
sw.Stop();
Console.WriteLine(" $$ getDataArray() took: " + sw.ElapsedMilliseconds + " ms");
return result;
}
Note: For some reason the string contains spaces that look longer than the usual spaces. I took it with copy-paste from the console log. It is a single character, not a tab, but it takes more space/ is wider than the usual space char.
Problem:
- When I measure the time from inside the method, it takes less than 1 ms.
- When I measure the time from outside, like this:
stopwatch.Restart();
// Get data
string[][] data = getDataArray(page.GetTsvText(0));
stopwatch.Stop();
Console.WriteLine(" $$ $$ Got data array in: " + stopwatch.ElapsedMilliseconds + " ms");
it takes about 2000 ms.
Does the string initialisation take so long? How can I get it faster, like under 50 ms?
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Linq 具有更好的性能和更快的结果。
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