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
/// <summary>
/// Returns the names of files in a specified directories that match the specified patterns using LINQ
/// </summary>
/// <param name="srcDirs">The directories to seach</param>
/// <param name="searchPatterns">the list of search patterns</param>
/// <param name="searchOption"></param>
/// <returns>The list of files that match the specified pattern</returns>
public static string[] GetFilesUsingLINQ(string[] srcDirs,
string[] searchPatterns,
SearchOption searchOption = SearchOption.AllDirectories)
{
var r = from dir in srcDirs
from searchPattern in searchPatterns
from f in Directory.GetFiles(dir, searchPattern, searchOption)
select f;
return r.ToArray();
}
其他回答
for
var exts = new[] { "mp3", "jpg" };
你可以:
public IEnumerable<string> FilterFiles(string path, params string[] exts) {
return
Directory
.EnumerateFiles(path, "*.*")
.Where(file => exts.Any(x => file.EndsWith(x, StringComparison.OrdinalIgnoreCase)));
}
不要忘记新的。net 4目录。EnumerateFiles用于性能提升(目录和文件的区别是什么?EnumerateFiles vs Directory.GetFiles?) “IgnoreCase”应该比“ToLower”(。EndsWith("aspx", stringcompare . ordinalignorecase)而不是。tolower ().EndsWith("aspx"))
但EnumerateFiles的真正好处体现在你拆分过滤器并合并结果时:
public IEnumerable<string> FilterFiles(string path, params string[] exts) {
return
exts.Select(x => "*." + x) // turn into globs
.SelectMany(x =>
Directory.EnumerateFiles(path, x)
);
}
如果你不需要将它们转换为glob(即exts = new[] {"*.mp3", "*.jpg"}),它会变得更快一些。
基于以下LinqPad测试的性能评估(注意:Perf只是重复委托10000次) https://gist.github.com/zaus/7454021
(从'duplicate'重新发布和扩展,因为这个问题特别要求没有LINQ:多个文件扩展searchPattern for System.IO.Directory.GetFiles)
对于。net 4.0及更高版本,
var files = Directory.EnumerateFiles("C:\\path", "*.*", SearchOption.AllDirectories)
.Where(s => s.EndsWith(".mp3") || s.EndsWith(".jpg"));
对于。net的早期版本,
var files = Directory.GetFiles("C:\\path", "*.*", SearchOption.AllDirectories)
.Where(s => s.EndsWith(".mp3") || s.EndsWith(".jpg"));
编辑:请阅读评论。Paul Farry提出的改进,以及Christian提出的记忆/性能问题。K点都很重要。
List<string> FileList = new List<string>();
DirectoryInfo di = new DirectoryInfo("C:\\DirName");
IEnumerable<FileInfo> fileList = di.GetFiles("*.*");
//Create the query
IEnumerable<FileInfo> fileQuery = from file in fileList
where (file.Extension.ToLower() == ".jpg" || file.Extension.ToLower() == ".png")
orderby file.LastWriteTime
select file;
foreach (System.IO.FileInfo fi in fileQuery)
{
fi.Attributes = FileAttributes.Normal;
FileList.Add(fi.FullName);
}
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
没有。试试下面的方法:
List<string> _searchPatternList = new List<string>();
...
List<string> fileList = new List<string>();
foreach ( string ext in _searchPatternList )
{
foreach ( string subFile in Directory.GetFiles( folderName, ext )
{
fileList.Add( subFile );
}
}
// Sort alpabetically
fileList.Sort();
// Add files to the file browser control
foreach ( string fileName in fileList )
{
...;
}
摘自:http://blogs.msdn.com/markda/archive/2006/04/20/580075.aspx