如何使用流读取器c#逐行正确读取文件
本文关键字:读取 文件 逐行 何使用 | 更新日期: 2023-09-27 18:21:43
如何逐行读取文件中的文本?
我使用的这个代码在第一轮中读取第一行和第二行。以下内容不起作用,因为它在方法sr.ReadLine()
中返回了两个不同的字符串。ReadLine()
方法是否从文件中提取下一行而不是当前行?
List<string> allInformation = new List<string>();
DateTime minimumDateTime = times[this.Step].AddMinutes(-different);
DateTime maximumDateTime = times[this.Step].AddMinutes(different);
using (FileStream fs = System.IO.File.Open(this.File, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (BufferedStream bs = new BufferedStream(fs))
using (StreamReader sr = new StreamReader(bs))
{
DateTime thisTime;
string[] info = new string[6];
while (sr.Peek() >= 0)
{
info = sr.ReadLine().Split(new string[] { ", ", ",", "'"" }, StringSplitOptions.RemoveEmptyEntries);
thisTime = DateTime.ParseExact(info[FileConstants.DATE], "yyyy-M-d H:m:s", null);
if (thisTime > minimumDateTime && thisTime < maximumDateTime)
{
allInformation.Add(sr.ReadLine());
}
}
}
您在循环中使用了两次ReadLine
。将StreamReader.ReadLine
的返回值存储在字符串变量中。否则,您将使读者进入下一行。
while (sr.Peek() >= 0)
{
string line = sr.ReadLine();
info = line.Split(new string[] { ", ", ",", "'"" }, StringSplitOptions.RemoveEmptyEntries);
thisTime = DateTime.ParseExact(info[FileConstants.DATE], "yyyy-M-d H:m:s", null);
if (thisTime > minimumDateTime && thisTime < maximumDateTime)
{
allInformation.Add(line);
}
}
我知道你已经有了答案,但我只是想指出,你可以像这样使用Linq更简洁地编写整个方法:
var minimumDateTime = times[this.Step].AddMinutes(-different);
var maximumDateTime = times[this.Step].AddMinutes(different);
var linesInDateRange =
from line in System.IO.File.ReadLines(this.File)
let info = line.Split(new[] {", ", ",", "'""}, StringSplitOptions.RemoveEmptyEntries)
let thisTime = DateTime.ParseExact(info[FileConstants.DATE], "yyyy-M-d H:m:s", null)
where thisTime > minimumDateTime && thisTime < maximumDateTime
select line;
var allInformation = linesInDateRange.ToList();