C# 文件夹中的文件数
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File count from a folder
提问by Sreejesh Kumar
How do I get number of Files from a folder using ASP.NET with C#?
如何使用 ASP.NET 和 C# 从文件夹中获取文件数？
采纳答案by X4lldux
System.IO.Directory myDir = GetMyDirectoryForTheExample();
int count = myDir.GetFiles().Length;
回答by rahul
You can use the Directory.GetFilesmethod
您可以使用Directory.GetFiles方法
Also see Directory.GetFiles Method (String, String, SearchOption)
另请参阅Directory.GetFiles 方法（字符串、字符串、搜索选项）
You can specify the search option in this overload.
您可以在此重载中指定搜索选项。
TopDirectoryOnly: Includes only the current directory in a search.
TopDirectoryOnly：仅包括搜索中的当前目录。
AllDirectories: Includes the current directory and all the subdirectories in a search operation. This option includes reparse points like mounted drives and symbolic links in the search.
AllDirectories：在搜索操作中包括当前目录和所有子目录。此选项包括重新分析点，如搜索中的已安装驱动器和符号链接。
// searches the current directory and sub directory
int fCount = Directory.GetFiles(path, "*", SearchOption.AllDirectories).Length;
// searches the current directory
int fCount = Directory.GetFiles(path, "*", SearchOption.TopDirectoryOnly).Length;
回答by Dean
回答by Krishna Thota
System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo("SourcePath");
int count = dir.GetFiles().Length;
You can use this.
你可以用这个。
回答by Nalan Madheswaran
Reading PDF files from a directory:
从目录中读取 PDF 文件：
var list = Directory.GetFiles(@"C:\ScanPDF", "*.pdf");
if (list.Length > 0)
{
}
回答by Wessam El Mahdy
To get the count of certain type extensions using LINQyou could use this simple code:
要使用LINQ获取某些类型扩展的数量，您可以使用以下简单代码：
Dim exts() As String = {".docx", ".ppt", ".pdf"}
Dim query = (From f As FileInfo In directory.GetFiles()).Where(Function(f) exts.Contains(f.Extension.ToLower()))
Response.Write(query.Count())
回答by anagha
Try following code to get count of files in the folder
尝试以下代码以获取文件夹中的文件数
string strDocPath = Server.MapPath('Enter your path here');
int docCount = Directory.GetFiles(strDocPath, "*",
SearchOption.TopDirectoryOnly).Length;
回答by detale
.NET methods Directory.GetFiles(dir) or DirectoryInfo.GetFiles() are not very fast for just getting a total file count. If you use this file count method very heavily, consider using WinAPI directly, which saves about 50% of time.
.NET 方法 Directory.GetFiles(dir) 或 DirectoryInfo.GetFiles() 仅用于获取文件总数并不是很快。如果你非常频繁地使用这种文件计数方法，可以考虑直接使用 WinAPI，这样可以节省大约 50% 的时间。
Here's the WinAPI approach where I encapsulate WinAPI calls to a C# method:
这是我将 WinAPI 调用封装到 C# 方法的 WinAPI 方法：
int GetFileCount(string dir, bool includeSubdirectories = false)
Complete code:
完整代码：
[Serializable, StructLayout(LayoutKind.Sequential)]
private struct WIN32_FIND_DATA
{
public int dwFileAttributes;
public int ftCreationTime_dwLowDateTime;
public int ftCreationTime_dwHighDateTime;
public int ftLastAccessTime_dwLowDateTime;
public int ftLastAccessTime_dwHighDateTime;
public int ftLastWriteTime_dwLowDateTime;
public int ftLastWriteTime_dwHighDateTime;
public int nFileSizeHigh;
public int nFileSizeLow;
public int dwReserved0;
public int dwReserved1;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string cFileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public string cAlternateFileName;
}
[DllImport("kernel32.dll")]
private static extern IntPtr FindFirstFile(string pFileName, ref WIN32_FIND_DATA pFindFileData);
[DllImport("kernel32.dll")]
private static extern bool FindNextFile(IntPtr hFindFile, ref WIN32_FIND_DATA lpFindFileData);
[DllImport("kernel32.dll")]
private static extern bool FindClose(IntPtr hFindFile);
private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
private const int FILE_ATTRIBUTE_DIRECTORY = 16;
private int GetFileCount(string dir, bool includeSubdirectories = false)
{
string searchPattern = Path.Combine(dir, "*");
var findFileData = new WIN32_FIND_DATA();
IntPtr hFindFile = FindFirstFile(searchPattern, ref findFileData);
if (hFindFile == INVALID_HANDLE_VALUE)
throw new Exception("Directory not found: " + dir);
int fileCount = 0;
do
{
if (findFileData.dwFileAttributes != FILE_ATTRIBUTE_DIRECTORY)
{
fileCount++;
continue;
}
if (includeSubdirectories && findFileData.cFileName != "." && findFileData.cFileName != "..")
{
string subDir = Path.Combine(dir, findFileData.cFileName);
fileCount += GetFileCount(subDir, true);
}
}
while (FindNextFile(hFindFile, ref findFileData));
FindClose(hFindFile);
return fileCount;
}
When I search in a folder with 13000 files on my computer - Average: 110ms
当我在计算机上搜索包含 13000 个文件的文件夹时 - 平均：110 毫秒
int fileCount = GetFileCount(searchDir, true); // using WinAPI
.NET built-in method: Directory.GetFiles(dir) - Average: 230ms
.NET 内置方法：Directory.GetFiles(dir) - 平均：230 毫秒
int fileCount = Directory.GetFiles(searchDir, "*", SearchOption.AllDirectories).Length;
Note: first run of either of the methods will be 60% - 100% slower respectively because the hard drive takes a little longer to locate the sectors. Subsequent calls will be semi-cached by Windows, I guess.
注意：第一次运行任何一种方法都会分别慢 60% - 100%，因为硬盘驱动器需要更长的时间来定位扇区。我猜后续调用将被 Windows 半缓存。
回答by Josue Martinez
int filesCount = Directory.EnumerateFiles(Directory).Count();
回答by Varun
int fileCount = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories).Length; // Will Retrieve count of all files in directry and sub directries
int fileCount = Directory.GetFiles(path, "*.*", SearchOption.TopDirectory).Length; // Will Retrieve count of all files in directry but not sub directries
int fileCount = Directory.GetFiles(path, "*.xml", SearchOption.AllDirectories).Length; // Will Retrieve count of files XML extension in directry and sub directries
