本文是小编为大家收集整理的关于根据多个选项过滤列表的处理/解决方法，可以参考本文帮助大家快速定位并解决问题，中文翻译不准确的可切换到English标签页查看源文。
问题描述
目前，我收到所有文件.如何过滤某些类型?
目前，我的代码看起来像这样:
public static List<FileInfo> BuildListOfFiles()
{
var d = new DirectoryInfo(Constants.FolderToMonitor);
if (d.Exists)
{
var files = (from file in d.EnumerateFiles() select file).ToList();
return files;
}
return null;
}
，但我只想要
*.mp4， *.mpg， *.avi， *.mpeg
我认为我需要另一个地方.但是不确定如何干净地处理多种类型.
推荐答案
您可以使用Linq进行过滤:
var searchExtensions = new string[] { ".mp4", ".mpg", ".avi", ".mpeg" };
var files = d.EnumerateFiles()
.Where(f => searchExtensions.Contains(Path.GetExtension(file))
.ToList();
或在查询语法中:
var searchExtensions = new string[] { ".mp4", ".mpg", ".avi", ".mpeg" };
var files =
(from file in d.EnumerateFiles()
where searchExtensions.Contains(Path.GetExtension(file))
select file)
.ToList();
另一种解决方案是建立您的文件列表而不是过滤:
var searchPatterns = new string[] { "*.mp4", "*.mpg", "*.avi", "*.mpeg" };
var files = searchPatterns.SelectMany(p => d.EnumerateFiles(p))
.ToList();
或在查询语法中:
var searchPatterns = new string[] { "*.mp4", "*.mpg", "*.avi", "*.mpeg" };
var files =
(from pattern in searchPatterns
from file in d.EnumerateFiles(pattern))
select file)
.ToList();
其他推荐答案
尝试过这样的方法:
List<FileInfo> mediaFiles = new List<FileInfo>();
foreach (string file in Directory.GetFiles(path))
{
FileInfo matchFiles = new FileInfo(file);
if ((matchFiles.Extension == ".mp4") || (matchFiles.Extension == ".mpg") || (matchFiles.Extension == ".avi") || (matchFiles.Extension == ".mpeg"))
{
mediaFiles.Add(matchFiles);
}
}
其他推荐答案
您可以使用GetFiles()函数
进行此操作var files = d.GetFiles("*.mp4|*.mpg|*.avi|*.mpeg", SearchOptions.AllDirectories).ToList();
问题描述
I want to return a list of files from a folder, based on a specific file extension.
At the moment, I get all files. How do I filter out certain types?
At the moment, my code looks like this:
public static List<FileInfo> BuildListOfFiles()
{
var d = new DirectoryInfo(Constants.FolderToMonitor);
if (d.Exists)
{
var files = (from file in d.EnumerateFiles() select file).ToList();
return files;
}
return null;
}
But I only want
*.mp4, *.mpg, *.avi, *.mpeg
I think I need another .Where, but not sure how to handle multiple types cleanly.
推荐答案
You can use Linq to do the filtering:
var searchExtensions = new string[] { ".mp4", ".mpg", ".avi", ".mpeg" };
var files = d.EnumerateFiles()
.Where(f => searchExtensions.Contains(Path.GetExtension(file))
.ToList();
Or in query syntax:
var searchExtensions = new string[] { ".mp4", ".mpg", ".avi", ".mpeg" };
var files =
(from file in d.EnumerateFiles()
where searchExtensions.Contains(Path.GetExtension(file))
select file)
.ToList();
An alternative solution would be to build up your file list rather than filtering it:
var searchPatterns = new string[] { "*.mp4", "*.mpg", "*.avi", "*.mpeg" };
var files = searchPatterns.SelectMany(p => d.EnumerateFiles(p))
.ToList();
Or in query syntax:
var searchPatterns = new string[] { "*.mp4", "*.mpg", "*.avi", "*.mpeg" };
var files =
(from pattern in searchPatterns
from file in d.EnumerateFiles(pattern))
select file)
.ToList();
其他推荐答案
Tried this way:
List<FileInfo> mediaFiles = new List<FileInfo>();
foreach (string file in Directory.GetFiles(path))
{
FileInfo matchFiles = new FileInfo(file);
if ((matchFiles.Extension == ".mp4") || (matchFiles.Extension == ".mpg") || (matchFiles.Extension == ".avi") || (matchFiles.Extension == ".mpeg"))
{
mediaFiles.Add(matchFiles);
}
}
其他推荐答案
You can do this by using GetFiles() function too
var files = d.GetFiles("*.mp4|*.mpg|*.avi|*.mpeg", SearchOptions.AllDirectories).ToList();
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