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
让你想要的扩展名为一个字符串,即“.mp3.jpg.wma.wmf”,然后检查每个文件是否包含你想要的扩展名。 这适用于。net 2.0,因为它不使用LINQ。
string myExtensions=".jpg.mp3";
string[] files=System.IO.Directory.GetFiles("C:\myfolder");
foreach(string file in files)
{
if(myExtensions.ToLower().contains(System.IO.Path.GetExtension(s).ToLower()))
{
//this file has passed, do something with this file
}
}
这种方法的优点是你可以添加或删除扩展,而不需要编辑代码,即添加png图像,只需写myExtensions=".jpg.mp3.png"。
其他回答
这个怎么样:
private static string[] GetFiles(string sourceFolder, string filters, System.IO.SearchOption searchOption)
{
return filters.Split('|').SelectMany(filter => System.IO.Directory.GetFiles(sourceFolder, filter, searchOption)).ToArray();
}
我在这里(评论中)找到了它:http://msdn.microsoft.com/en-us/library/wz42302f.aspx
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);
}
如果你使用VB。NET(或将依赖导入到你的c#项目中),实际上存在一个方便的方法,允许过滤多个扩展:
Microsoft.VisualBasic.FileIO.FileSystem.GetFiles("C:\\path", Microsoft.VisualBasic.FileIO.SearchOption.SearchAllSubDirectories, new string[] {"*.mp3", "*.jpg"});
在VB。NET可以通过My-namespace访问:
My.Computer.FileSystem.GetFiles("C:\path", FileIO.SearchOption.SearchAllSubDirectories, {"*.mp3", "*.jpg"})
不幸的是,这些方便的方法不支持像Directory.EnumerateFiles()那样的惰性求值变体。
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;
我不能使用. where方法,因为我在. net Framework 2.0中编程(Linq只在. net Framework 3.5+中被支持)。
下面的代码不区分大小写(因此.cab或.cab也会被列出)。
string[] ext = new string[2] { "*.CAB", "*.MSU" };
foreach (string found in ext)
{
string[] extracted = Directory.GetFiles("C:\\test", found, System.IO.SearchOption.AllDirectories);
foreach (string file in extracted)
{
Console.WriteLine(file);
}
}