我想逐行阅读一个文本文件。我想知道我是否在.NET C#范围内尽可能高效地完成了这项工作。
这就是我到目前为止一直在尝试的:
var filestream = new System.IO.FileStream(textFilePath,
System.IO.FileMode.Open,
System.IO.FileAccess.Read,
System.IO.FileShare.ReadWrite);
var file = new System.IO.StreamReader(filestream, System.Text.Encoding.UTF8, true, 128);
while ((lineOfText = file.ReadLine()) != null)
{
//Do something with the lineOfText
}发布于 2014-07-23 21:12:44
虽然File.ReadAllLines()是读取文件的最简单的方法之一,但它也是最慢的方法之一。
如果您只想读取文件中的行,而不想做太多操作,according to these benchmarks,读取文件的最快方法是古老的方法:
using (StreamReader sr = File.OpenText(fileName))
{
string s = String.Empty;
while ((s = sr.ReadLine()) != null)
{
//do minimal amount of work here
}
}然而,如果你必须对每一行做很多事情,那么this article的结论是最好的方法如下(如果你知道你要读多少行,那么预先分配一个string[]会更快):
AllLines = new string[MAX]; //only allocate memory here
using (StreamReader sr = File.OpenText(fileName))
{
int x = 0;
while (!sr.EndOfStream)
{
AllLines[x] = sr.ReadLine();
x += 1;
}
} //Finished. Close the file
//Now parallel process each line in the file
Parallel.For(0, AllLines.Length, x =>
{
DoYourStuff(AllLines[x]); //do your work here
});https://stackoverflow.com/questions/8037070
复制相似问题