GetFiles文件数量有限 [英] GetFiles Limited number of files

问题描述

我有一个Web服务，该服务读取包含40 000个文件的目录的内容，因此每次服务调用GetFiles都需要一定的时间.

我的问题是是否可以请求多个文件，例如GetFiles(Path，StartIndex，Count)

I have a web service which reads the content of a directory which contains 40 000 files so each time the service calls GetFiles it takes ages.

My question is it possible to request a number of files, for something like GetFiles(Path, StartIndex, Count)

推荐答案

，除非您自己编写代码.当然，您可以创建一个进行调用的线程，然后让该应用继续其业务.



编辑您的回复==============

我有点想用户正在等待结果，但是如果使用线程，至少用户可以取消操作.

我在Google上找到此Codeproject文章.

更快的目录枚举器 [

Not unless you write the code yourself. Of course, you could create a thread that makes the call, and let the app go on about its business.



EDIT for your response ==============

I kinda figured that the user is waiting for the results, but by using a thread, at least the user can cancel the operation if he wants to...

I found this Codeproject article with google.

A Faster Directory Enumerator[^]

好问题:我会投票5.

您可能需要P/Invoke才能使用WIN32.

Good question: I''ll vote 5.

You may need P/Invoke to use WIN32.

// The CharSet must match the CharSet of the corresponding PInvoke signature
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
struct WIN32_FIND_DATA
{
    public uint dwFileAttributes;
    public System.Runtime.InteropServices.ComTypes.FILETIME
        ftCreationTime;
    public System.Runtime.InteropServices.ComTypes.FILETIME  
        ftLastAccessTime;
    public System.Runtime.InteropServices.ComTypes.FILETIME 
        ftLastWriteTime;
    public uint nFileSizeHigh;
    public uint nFileSizeLow;
    public uint dwReserved0;
    public uint dwReserved1;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=260)]
    public string cFileName;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=14)]
    public string cAlternateFileName;
}

[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
static extern IntPtr FindFirstFile(string lpFileName,
    out WIN32_FIND_DATA lpFindFileData);

[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
static extern bool FindNextFile(IntPtr hFindFile,
       out WIN32_FIND_DATA lpFindFileData);
}

你看?使用FindFirstFile只能找到一个文件，然后使用FindFirstFile返回的指针使用FindNextFile.
不幸的是，我没有看到如何实现StartIndex.但是，您可以想到此方法与重命名架构的某种组合.

You see? Using FindFirstFile you find only one file, then you work with FindNextFile using a pointer returned by FindFirstFile.
Unfortunately, I don''t see the how to implement StartIndex. However, you can think of some combination of this method with some renaming schema.

为什么不使用DirectoryInfo.EnumerateFiles?

why not use DirectoryInfo.EnumerateFiles ?

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