我试图使用Directory.GetFiles()方法检索多种类型的文件列表,如mp3的和jpg的。以下两种方法我都试过了,但都没有成功:
Directory.GetFiles("C:\\path", "*.mp3|*.jpg", SearchOption.AllDirectories);
Directory.GetFiles("C:\\path", "*.mp3;*.jpg", SearchOption.AllDirectories);
有没有办法一次就能搞定?
我试图使用Directory.GetFiles()方法检索多种类型的文件列表,如mp3的和jpg的。以下两种方法我都试过了,但都没有成功:
Directory.GetFiles("C:\\path", "*.mp3|*.jpg", SearchOption.AllDirectories);
Directory.GetFiles("C:\\path", "*.mp3;*.jpg", SearchOption.AllDirectories);
有没有办法一次就能搞定?
当前回答
还有一个下降解决方案,似乎没有任何内存或性能开销,而且相当优雅:
string[] filters = new[]{"*.jpg", "*.png", "*.gif"};
string[] filePaths = filters.SelectMany(f => Directory.GetFiles(basePath, f)).ToArray();
其他回答
是什么
string[] filesPNG = Directory.GetFiles(path, "*.png");
string[] filesJPG = Directory.GetFiles(path, "*.jpg");
string[] filesJPEG = Directory.GetFiles(path, "*.jpeg");
int totalArraySizeAll = filesPNG.Length + filesJPG.Length + filesJPEG.Length;
List<string> filesAll = new List<string>(totalArraySizeAll);
filesAll.AddRange(filesPNG);
filesAll.AddRange(filesJPG);
filesAll.AddRange(filesJPEG);
另一种使用Linq的方式,但是不需要返回所有内容并在内存中过滤。
var files = Directory.GetFiles("C:\\path", "*.mp3", SearchOption.AllDirectories).Union(Directory.GetFiles("C:\\path", "*.jpg", SearchOption.AllDirectories));
它实际上是对GetFiles()的2次调用,但我认为这与问题的精神是一致的,并以一个可枚举的形式返回它们。
Let
var set = new HashSet<string>(
new[] { ".mp3", ".jpg" },
StringComparer.OrdinalIgnoreCase); // ignore case
var dir = new DirectoryInfo(path);
Then
dir.EnumerateFiles("*.*", SearchOption.AllDirectories)
.Where(f => set.Contains(f.Extension));
or
from file in dir.EnumerateFiles("*.*", SearchOption.AllDirectories)
from ext in set // makes sense only if it's just IEnumerable<string> or similar
where String.Equals(ext, file.Extension, StringComparison.OrdinalIgnoreCase)
select file;
下面的函数搜索多个以逗号分隔的模式。你也可以指定一个排除,例如:"!web。Config”将搜索所有文件并排除“web.config”。模式可以混合使用。
private string[] FindFiles(string directory, string filters, SearchOption searchOption)
{
if (!Directory.Exists(directory)) return new string[] { };
var include = (from filter in filters.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries) where !string.IsNullOrEmpty(filter.Trim()) select filter.Trim());
var exclude = (from filter in include where filter.Contains(@"!") select filter);
include = include.Except(exclude);
if (include.Count() == 0) include = new string[] { "*" };
var rxfilters = from filter in exclude select string.Format("^{0}$", filter.Replace("!", "").Replace(".", @"\.").Replace("*", ".*").Replace("?", "."));
Regex regex = new Regex(string.Join("|", rxfilters.ToArray()));
List<Thread> workers = new List<Thread>();
List<string> files = new List<string>();
foreach (string filter in include)
{
Thread worker = new Thread(
new ThreadStart(
delegate
{
string[] allfiles = Directory.GetFiles(directory, filter, searchOption);
if (exclude.Count() > 0)
{
lock (files)
files.AddRange(allfiles.Where(p => !regex.Match(p).Success));
}
else
{
lock (files)
files.AddRange(allfiles);
}
}
));
workers.Add(worker);
worker.Start();
}
foreach (Thread worker in workers)
{
worker.Join();
}
return files.ToArray();
}
用法:
foreach (string file in FindFiles(@"D:\628.2.11", @"!*.config, !*.js", SearchOption.AllDirectories))
{
Console.WriteLine(file);
}
只是找到了另一种方法。仍然不是一次操作,而是把它扔出去,看看其他人是怎么想的。
private void getFiles(string path)
{
foreach (string s in Array.FindAll(Directory.GetFiles(path, "*", SearchOption.AllDirectories), predicate_FileMatch))
{
Debug.Print(s);
}
}
private bool predicate_FileMatch(string fileName)
{
if (fileName.EndsWith(".mp3"))
return true;
if (fileName.EndsWith(".jpg"))
return true;
return false;
}