EnumerateFileSystemInfos Method (String, SearchOption)

DirectoryInfo.EnumerateFileSystemInfos Method (String, SearchOption)


Returns an enumerable collection of file system information that matches a specified search pattern and search subdirectory option.

Namespace:   System.IO
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.

Type: System.IO.SearchOption

One of the enumeration values that specifies whether the search operation should include only the current directory or all subdirectories. The default value is TopDirectoryOnly.

Return Value

Type: System.Collections.Generic.IEnumerable<FileSystemInfo>

An enumerable collection of file system information objects that matches searchPattern and searchOption.

Exception Condition

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.

Wildcard specifier


* (asterisk)

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".

The EnumerateFileSystemInfos and GetFileSystemInfos methods differ as follows:

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.

Universal Windows Platform
Available since 10
.NET Framework
Available since 4.0
Available since 4.0
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