DirectoryInfo.EnumerateFiles Method (String, SearchOption)
Returns an enumerable collection of file information that matches a specified search pattern and search subdirectory option.
Assembly: mscorlib (in mscorlib.dll)
member EnumerateFiles : searchPattern:string * searchOption:SearchOption -> IEnumerable<FileInfo>
- Type: System.String
The search string to match against the names of files. 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 a null reference (Nothing in Visual Basic).
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, EnumerateFiles can be more efficient.
This method pre-populates the values of the following FileInfo properties:
The returned collection is not cached; each call to the GetEnumerator method on the collection will start a new enumeration.
The following example shows how to enumerate files in a directory by using different search options. The example assumes a directory that has files named log1.txt, log2.txt, test1.txt, test2.txt, test3.txt, and a subdirectory that has a file named SubFile.txt.