我需要尽快打开和读取数千个文件。
我对 13 592 个文件进行了一些测试，发现方法 1 比方法 2 稍快。这些文件通常在 800 字节到 4kB 之间。我想知道是否可以做些什么来使这个 I/O 密集的过程更快？
Method 1:
Run 1: 3:05 (don't know what happened here)
Run 2: 1:55
Run 3: 2:06
Run 4: 2:02
Method 2:
Run 1: 2:04
Run 2: 2:08
Run 3: 2:04
Run 4: 2:12
这是代码：
public class FileOpenerUtil
{
/// <summary>
///
/// </summary>
/// <param name="fullFilePath"></param>
/// <returns></returns>
public static string ReadFileToString(string fullFilePath)
{
while (true)
{
try
{
//Methode 1
using (StreamReader sr = File.OpenText(fullFilePath))
{
string fullMessage = "";
string s;
while ((s = sr.ReadLine()) != null)
{
fullMessage += s + "\n";
}
return RemoveCarriageReturn(fullMessage);
}
//Methode 2
/*using (File.Open(fullFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
Console.WriteLine("Output file {0} ready.", fullFilePath);
string[] lines = File.ReadAllLines(fullFilePath);
//Every new line under the previous line
string fullMessage = lines.Aggregate("", (current, s) => current + s + "\n");
return RemoveCarriageReturn(fullMessage);
//ninject kernel
}*/
//Methode 3
}
catch (FileNotFoundException ex)
{
Console.WriteLine("Output file {0} not yet ready ({1})", fullFilePath, ex.Message);
}
catch (IOException ex)
{
Console.WriteLine("Output file {0} not yet ready ({1})", fullFilePath, ex.Message);
}
catch (UnauthorizedAccessException ex)
{
Console.WriteLine("Output file {0} not yet ready ({1})", fullFilePath, ex.Message);
}
}
}
/// <summary>
/// Verwijdert '\r' in een string sequence
/// </summary>
/// <param name="message">The text that has to be changed</param>
/// <returns>The changed text</returns>
private static string RemoveCarriageReturn(string message)
{
return message.Replace("\r", "");
}
}
我正在读取的文件是 .HL7 文件，如下所示：
MSH|^~\&|OAZIS||||20150430235954||ADT^A03|23669166|P|2.3||||||ASCII
EVN|A03|20150430235954||||201504302359
PID|1||6001144000||姓氏^名字^^^Mevr.|姓氏^名字|19600114|F|||GS街道名称号码^^城市^^邮政编码^B^H||09/3444556^^PH~0476519246echtg^ ^CP||NL|M||28783409^^^^VN|0000000000|60011402843||||||B||||N
PD1||||003847^姓氏^名字||||||||N|||0
PV1|1|O|FDAG^000^053^001^0^2|NULL||FDAG^000^053^001|003847^姓氏^名字||006813^姓氏^名字|1900|00||||| |006813^姓氏^名字|0|28783409^^^^VN|1^20150430|01||||||||||||||1|1||D|||||201504301336|201504302359
OBX|1|CE|KIND_OF_DIS|RCM|1^1 手术医疗建议
OBX|2|CE|DESTINATION_DIS|RCM|1^1 Terug naar huis
打开文件后，我用以下命令解析字符串j4jayant 的 HL7 解析器 https://github.com/j4jayant/hl7-cSharp-parser/tree/master/j4jayant.HL7.Parser并关闭文件。
