1.迭代文件的行
复制代码 代码如下:
public static IEnumerable ReadLines(string fileName)
{
using (TextReader reader = File.OpenText(fileName))
{
string line;
if ((line = reader.ReadLine()) != null)
{
yield return line;
}
}
}
static void Main()
{
foreach (string line in Iterator.ReadLines(""))
{
Console.WriteLine(line);
}
}
2.使用迭代器和谓词对文件中的行进行筛选
复制代码 代码如下:
public static IEnumerable where(IEnumerable source, Predicate predicate)
{
if (source == null || predicate == null)
{
throw new ArgumentNullException();
}
return WhereImplemeter(source, predicate);
}
private static IEnumerable WhereImplemeter(IEnumerable source, Predicate predicate)
{
foreach (T item in source)
{
if (predicate(item))
{
yield return item;
}
}
}
static void Main()
{
IEnumerable lines = File.ReadAllLines(@"your file name");
Predicate predicate = delegate(string line)
{
return line.StartsWith("using");
};
foreach (string str in where(lines, predicate))
{
Console.WriteLine(str);
}
}
http://www.bkjia.com/PHPjc/327537.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/327537.htmlTechArticle1.迭代文件的行 复制代码 代码如下: public static IEnumerablestring ReadLines(string fileName) { using (TextReader reader = File.OpenText(fileName)) { string line; if (...
Statement：The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
