使用C#,如何删除目录中的所有文件和文件夹,但仍然保留根目录?
当前回答
以下代码将清理目录,但将根目录保留在那里(递归)。
Action<string> DelPath = null;
DelPath = p =>
{
Directory.EnumerateFiles(p).ToList().ForEach(File.Delete);
Directory.EnumerateDirectories(p).ToList().ForEach(DelPath);
Directory.EnumerateDirectories(p).ToList().ForEach(Directory.Delete);
};
DelPath(path);
其他回答
我们也可以表现出对LINQ的热爱:
using System.IO;
using System.Linq;
…
var directory = Directory.GetParent(TestContext.TestDir);
directory.EnumerateFiles()
.ToList().ForEach(f => f.Delete());
directory.EnumerateDirectories()
.ToList().ForEach(d => d.Delete(true));
请注意,我这里的解决方案不是高性能的,因为我使用的是Get*().ToList().ForEach(…),它两次生成相同的IEnumerable。我使用扩展方法来避免此问题:
using System.IO;
using System.Linq;
…
var directory = Directory.GetParent(TestContext.TestDir);
directory.EnumerateFiles()
.ForEachInEnumerable(f => f.Delete());
directory.EnumerateDirectories()
.ForEachInEnumerable(d => d.Delete(true));
这是扩展方法:
/// <summary>
/// Extensions for <see cref="System.Collections.Generic.IEnumerable"/>.
/// </summary>
public static class IEnumerableOfTExtensions
{
/// <summary>
/// Performs the <see cref="System.Action"/>
/// on each item in the enumerable object.
/// </summary>
/// <typeparam name="TEnumerable">The type of the enumerable.</typeparam>
/// <param name="enumerable">The enumerable.</param>
/// <param name="action">The action.</param>
/// <remarks>
/// “I am philosophically opposed to providing such a method, for two reasons.
/// …The first reason is that doing so violates the functional programming principles
/// that all the other sequence operators are based upon. Clearly the sole purpose of a call
/// to this method is to cause side effects.”
/// —Eric Lippert, “foreach” vs “ForEach” [http://blogs.msdn.com/b/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx]
/// </remarks>
public static void ForEachInEnumerable<TEnumerable>(this IEnumerable<TEnumerable> enumerable, Action<TEnumerable> action)
{
foreach (var item in enumerable)
{
action(item);
}
}
}
DirectoryInfo Folder = new DirectoryInfo(Server.MapPath(path));
if (Folder .Exists)
{
foreach (FileInfo fl in Folder .GetFiles())
{
fl.Delete();
}
Folder .Delete();
}
System.IO.DirectoryInfo di = new DirectoryInfo("YourPath");
foreach (FileInfo file in di.GetFiles())
{
file.Delete();
}
foreach (DirectoryInfo dir in di.GetDirectories())
{
dir.Delete(true);
}
如果您的目录可能有许多文件,EnumerateFiles()比GetFiles()更有效,因为当您使用EnumerateFile()时,您可以在返回整个集合之前开始枚举它,而不是GetFiles(,在开始枚举之前,您需要在内存中加载整个集合。请参阅此处的引用:
因此,当您使用许多文件和目录时,EnumerateFiles()可以更有效。
这同样适用于EnumerateDirectories()和GetDirectory()。所以代码应该是:
foreach (FileInfo file in di.EnumerateFiles())
{
file.Delete();
}
foreach (DirectoryInfo dir in di.EnumerateDirectories())
{
dir.Delete(true);
}
对于这个问题,确实没有理由使用GetFiles()和GetDirectories()。
private void ClearFolder(string FolderName)
{
DirectoryInfo dir = new DirectoryInfo(FolderName);
foreach(FileInfo fi in dir.GetFiles())
{
try
{
fi.Delete();
}
catch(Exception) { } // Ignore all exceptions
}
foreach(DirectoryInfo di in dir.GetDirectories())
{
ClearFolder(di.FullName);
try
{
di.Delete();
}
catch(Exception) { } // Ignore all exceptions
}
}
如果您知道没有子文件夹,那么像这样的操作可能是最简单的:
Array.ForEach(Directory.GetFiles(folderName), File.Delete);
new System.IO.DirectoryInfo(@"C:\Temp").Delete(true);
//Or
System.IO.Directory.Delete(@"C:\Temp", true);