最简单的方法：

Directory.Delete(path,true);  
Directory.CreateDirectory(path);

请注意，这可能会删除文件夹上的某些权限。

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);
        }
    }
}

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);

以下代码将递归清除文件夹：

private void clearFolder(string FolderName)
{
    DirectoryInfo dir = new DirectoryInfo(FolderName);

    foreach(FileInfo fi in dir.GetFiles())
    {
        fi.Delete();
    }

    foreach (DirectoryInfo di in dir.GetDirectories())
    {
        clearFolder(di.FullName);
        di.Delete();
    }
}

我用过

Directory.GetFiles(picturePath).ToList().ForEach(File.Delete);

删除旧图片，我不需要此文件夹中的任何对象

此版本不使用递归调用，并解决了只读问题。

public static void EmptyDirectory(string directory)
{
    // First delete all the files, making sure they are not readonly
    var stackA = new Stack<DirectoryInfo>();
    stackA.Push(new DirectoryInfo(directory));

    var stackB = new Stack<DirectoryInfo>();
    while (stackA.Any())
    {
        var dir = stackA.Pop();
        foreach (var file in dir.GetFiles())
        {
            file.IsReadOnly = false;
            file.Delete();
        }
        foreach (var subDir in dir.GetDirectories())
        {
            stackA.Push(subDir);
            stackB.Push(subDir);
        }
    }

    // Then delete the sub directories depth first
    while (stackB.Any())
    {
        stackB.Pop().Delete();
    }
}