Possible Duplicate:
Easiest way to split a string on newlines in .net?
I'm trying to read out and interpret a string line per line. I took a look at the StringReader class, but I need to find out when I'm on the last line. Here's some pseudocode of what I'm trying to accomplish:
while (!stringReaderObject.atEndOfStream()) {
interpret(stringReaderObject.readLine());
}
Does somebody know how to do this?
Thanks!
Yvan
If you are reading it in from a file, it is easier to do just do:
foreach(var myString in File.ReadAllLines(pathToFile))
interpret(myString);
If you are getting the string from somewhere else (a web service class or the like) it is simpler to just split the string:
foreach(var myString in entireString.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries))
interpret(myString);
File.ReadLines (.Net 4.0) which returns a IEnumerable<string> so you get lines while reading the file which is better in two ways: 1. You don't have the whole line-array in memory if you don't need it. 2. ReadAllLines reads the whole file before you get a single line where ReadLines will give you the first line as soon as it is read. (more responsive). Because he is calling a method on each line which interprets it, he properly wants ReadLines and not ReadAllLines.
Like this:
string line;
while (null != (line = reader.ReadLine()) {
Process(line);
}
while(true) { string line = reader.ReadLine(); if(line == null) { break; } Process(line); }. That single line of code is doing too much.
if() is just a distraction.Dismissile is correct:
http://msdn.microsoft.com/en-us/library/system.io.streamreader.endofstream.aspx
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
}
StreamReader. This question is asking about StringReader, which has no such property.The StreamReader class has an EndOfStream property. Have you looked into using that?
I am not sure where you are reading from. If it is from the Console, you can check for the end of inputs string like "quit" to denote end of input
String input;
while((input = reader.readLine()) != "quit"){
// do something
}
private static IEnumerable<string> ReadAllLines(string multiLineString) { if (string.IsNullOrEmpty(multiLineString)) yield break; // Nothing to do using (var reader = new StringReader(multiLineString)) { string line; while ((line = reader.ReadLine()) is object) { yield return line; } } }