Detailed explanation of using iterator to traverse file information

Detailed explanation of using iterator to traverse file information_PHP tutorial

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Release： 2016-07-21 15:07:28

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1. Iterate the lines of the file

Copy the code The code is as follows:

 public static IEnumerable ReadLines(string fileName)
 {
 using (TextReader reader = File.OpenText(fileName))
 {
 string line;
 if (( line = reader.ReadLine()) != null)
                                                                                                                                                                  static void Main()
 {
 foreach (string line in Iterator.ReadLines(" "))
                                                                                                                                                                                                                                                 Console.WriteLine. proceed Filter




Copy code

 The code is as follows:

public static IEnumerable where(IEnumerable predicate)
{ if (source == null || predicate == null)
{ throw new ArgumentNullException();

} WhereImplemeter(source, predicate); } private static IEnumerable WhereImplemeter(IEnumerable source, Predicate predicate) foreach (T item in source )

IEnumerable lines = File.ReadAllLines(@"your file name");
Predicate predicate = delegate(string line)
return line .StartsWith("using" );
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}