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DirectoryCatalog Constructor (String, String)

Initializes a new instance of the DirectoryCatalog class with ComposablePartDefinition objects based on the specified search pattern in the specified directory path.

Namespace:  System.ComponentModel.Composition.Hosting
Assembly:  System.ComponentModel.Composition (in System.ComponentModel.Composition.dll)

public DirectoryCatalog(
	string path,
	string searchPattern


Type: System.String
Path to the directory to scan for assemblies to add to the catalog.
The path must be absolute or relative to BaseDirectory.
Type: System.String
The pattern to search with. The format of the pattern should be the same as specified for GetFiles.


The specified path is invalid. For example, it is on an unmapped drive.


path is null or searchPattern is null.


The caller does not have the required permission.


path is a zero-length string, contains only white space, or contains one or more implementation-specific invalid characters.


searchPattern does not contain a valid pattern.


The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based computers, paths must be less than 248 characters and file names must be less than 260 characters.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.