DirectoryInfo.EnumerateFileSystemInfos Method (String, SearchOption)
Returns an enumerable collection of file system information that matches a specified search pattern and search subdirectory option.
Assembly: mscorlib (in mscorlib.dll)
public IEnumerable<FileSystemInfo> EnumerateFileSystemInfos( string searchPattern, SearchOption searchOption )
- Type: System.String
The search string to match against the names of directories. This parameter can contain a combination of valid literal path and wildcard (* and ?) characters (see Remarks), but doesn't support regular expressions. The default pattern is "*", which returns all files.
searchPattern is null.
searchOption is not a valid SearchOption value.
The path encapsulated in the DirectoryInfo object is invalid (for example, it is on an unmapped drive).
The caller does not have the required permission.
searchPattern can be a combination of literal and wildcard characters, but doesn't support regular expressions. The following wildcard specifiers are permitted in searchPattern.
Zero or more characters in that position.
? (question mark)
Zero or one character in that position.
Characters other than the wildcard are literal characters. For example, the string "*t" searches for all names in ending with the letter "t". ". The searchPattern string "s*" searches for all names in path beginning with the letter "s".
Therefore, when you are working with many files and directories, EnumerateFileSystemInfos can be more efficient.
This method pre-populates the values of the following FileSystemInfo properties:
The returned collection is not cached; each call to the GetEnumerator method on the collection will start a new enumeration.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.