DirectoryCatalog
Class
Definition
Discovers attributed parts in the assemblies in a specified directory.
In This Article
public class DirectoryCatalog : System.ComponentModel.Composition.Primitives.ComposablePartCatalog, System.ComponentModel.Composition.Hosting.INotifyComposablePartCatalogChanged, System.ComponentModel.Composition.Primitives.ICompositionElement
Inheritance
Implements
Inherited Members
System.ComponentModel.Composition.Primitives.ComposablePartCatalog
System.Object
Examples
The following example creates a DirectoryCatalog object that searches the directory the application runs from for parts. It uses a simple import to test the catalog. To fulfill this import, a DLL in the directory must have a matching export, as illustrated in the second code block.
public class Test2
{
[Import]
public Test1 data { get; set; }
}
class Program
{
static void Main(string[] args)
{
DirectoryCatalog catalog = new DirectoryCatalog(".");
CompositionContainer container = new CompositionContainer(catalog);
Test2 test = new Test2();
container.SatisfyImportsOnce(test);
Console.WriteLine(test.data.data);
Console.ReadLine();
}
}
Public Class Test2
<Import()>
Public Property data As Test1
End Class
Sub Main()
Dim catalog As New DirectoryCatalog(".")
Dim container As New CompositionContainer(catalog)
Dim test As New Test2()
container.SatisfyImportsOnce(test)
Console.WriteLine(test.data.data)
Console.ReadLine()
End Sub
To create the matching export, the following code must be in a DLL file. To create a DLL file in Visual Studio, add a new project of the type "Class Library" to your solution, and place this code in it.
[Export]
public class Test1
{
public String data = "The data!";
}
<Export()>
Public Class Test1
Public ReadOnly Property data As String
Get
Return "The data!"
End Get
End Property
End Class
Remarks
You can use a DirectoryCatalog object to parse the contents of a designated directory. Any attributed parts contained in dynamic link library (DLL) files are extracted and made available through the catalog.To restrict parsing to specific DLLs, you can specify a search pattern by using the same syntax as the Directory.GetFiles method.
Warning The designated directory should not allow access to non-administrators. For example, using a folder that contains temporary Internet files could create vulnerabilities in your application.
This type implements the IDisposable interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its Dispose method in a try/catch block. To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). For more information, see the "Using an Object that Implements IDisposable" section in the IDisposable interface topic.
Constructors
DirectoryCatalog(String)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on all the DLL files in the specified directory path.
DirectoryCatalog(String, ICompositionElement)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on all the DLL files in the specified directory path with the specified source for parts.
DirectoryCatalog(String, ReflectionContext)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on all the DLL files in the specified directory path, in the specified reflection context.
DirectoryCatalog(String, String)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects that match a specified search pattern in the specified directory path.
DirectoryCatalog(String, ReflectionContext, ICompositionElement)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on all the DLL files in the specified directory path, in the specified reflection context.
DirectoryCatalog(String, String, ICompositionElement)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on the specified search pattern in the specified directory path with the specified source for parts.
DirectoryCatalog(String, String, ReflectionContext)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on the specified search pattern in the specified directory path, using the specified reflection context.
DirectoryCatalog(String, String, ReflectionContext, ICompositionElement)
Initializes a new instance of the DirectoryCatalog class by using ComposablePartDefinition objects based on the specified search pattern in the specified directory path, using the specified reflection context.
Properties
Methods
Events
Changed
Occurs when the contents of the catalog has changed.
Changing
Occurs when the catalog is changing.
Explicit Interface Implementations
Extension Methods
CreateCompositionService(ComposablePartCatalog)
Filter(ComposablePartCatalog, Func<ComposablePartDefinition,Boolean>)
CopyToDataTable<T>(IEnumerable<T>)
CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption)
CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption, FillErrorEventHandler)
Aggregate<TSource>(IEnumerable<TSource>, Func<TSource,TSource,TSource>)
Aggregate<TSource,TAccumulate>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>)
Aggregate<TSource,TAccumulate,TResult>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>, Func<TAccumulate,TResult>)
All<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
Any<TSource>(IEnumerable<TSource>)
Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
Append<TSource>(IEnumerable<TSource>, TSource)
AsEnumerable<TSource>(IEnumerable<TSource>)
Average(IEnumerable<Decimal>)
Average(IEnumerable<Double>)
Average(IEnumerable<Int32>)
Average(IEnumerable<Int64>)
Average(IEnumerable<Nullable<Decimal>>)
Average(IEnumerable<Nullable<Double>>)
Average(IEnumerable<Nullable<Int32>>)
Average(IEnumerable<Nullable<Int64>>)
Average(IEnumerable<Nullable<Single>>)
Average(IEnumerable<Single>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Double>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)
Average<TSource>(IEnumerable<TSource>, Func<TSource,Single>)
Cast<TResult>(IEnumerable)
Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)
Contains<TSource>(IEnumerable<TSource>, TSource)
Contains<TSource>(IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)
Count<TSource>(IEnumerable<TSource>)
Count<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
DefaultIfEmpty<TSource>(IEnumerable<TSource>)
DefaultIfEmpty<TSource>(IEnumerable<TSource>, TSource)
Distinct<TSource>(IEnumerable<TSource>)
Distinct<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)
ElementAt<TSource>(IEnumerable<TSource>, Int32)
ElementAtOrDefault<TSource>(IEnumerable<TSource>, Int32)
Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)
Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)
First<TSource>(IEnumerable<TSource>)
First<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
FirstOrDefault<TSource>(IEnumerable<TSource>)
FirstOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
GroupBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)
GroupBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
GroupBy<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
GroupBy<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
GroupBy<TSource,TKey,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,IEnumerable<TSource>,TResult>)
GroupBy<TSource,TKey,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,IEnumerable<TSource>,TResult>, IEqualityComparer<TKey>)
GroupBy<TSource,TKey,TElement,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, Func<TKey,IEnumerable<TElement>,TResult>)
GroupBy<TSource,TKey,TElement,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, Func<TKey,IEnumerable<TElement>,TResult>, IEqualityComparer<TKey>)
GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>,TResult>)
GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>,TResult>, IEqualityComparer<TKey>)
Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)
Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)
Join<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,TInner,TResult>)
Join<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,TInner,TResult>, IEqualityComparer<TKey>)
Last<TSource>(IEnumerable<TSource>)
Last<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
LastOrDefault<TSource>(IEnumerable<TSource>)
LastOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
LongCount<TSource>(IEnumerable<TSource>)
LongCount<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
Max(IEnumerable<Decimal>)
Max(IEnumerable<Double>)
Max(IEnumerable<Int32>)
Max(IEnumerable<Int64>)
Max(IEnumerable<Nullable<Decimal>>)
Max(IEnumerable<Nullable<Double>>)
Max(IEnumerable<Nullable<Int32>>)
Max(IEnumerable<Nullable<Int64>>)
Max(IEnumerable<Nullable<Single>>)
Max(IEnumerable<Single>)
Max<TSource>(IEnumerable<TSource>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Double>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)
Max<TSource>(IEnumerable<TSource>, Func<TSource,Single>)
Max<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)
Min(IEnumerable<Decimal>)
Min(IEnumerable<Double>)
Min(IEnumerable<Int32>)
Min(IEnumerable<Int64>)
Min(IEnumerable<Nullable<Decimal>>)
Min(IEnumerable<Nullable<Double>>)
Min(IEnumerable<Nullable<Int32>>)
Min(IEnumerable<Nullable<Int64>>)
Min(IEnumerable<Nullable<Single>>)
Min(IEnumerable<Single>)
Min<TSource>(IEnumerable<TSource>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Double>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)
Min<TSource>(IEnumerable<TSource>, Func<TSource,Single>)
Min<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)
OfType<TResult>(IEnumerable)
OrderBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)
OrderBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)
OrderByDescending<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)
OrderByDescending<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)
Prepend<TSource>(IEnumerable<TSource>, TSource)
Reverse<TSource>(IEnumerable<TSource>)
Select<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)
Select<TSource,TResult>(IEnumerable<TSource>, Func<TSource,Int32,TResult>)
SelectMany<TSource,TResult>(IEnumerable<TSource>, Func<TSource,IEnumerable<TResult>>)
SelectMany<TSource,TResult>(IEnumerable<TSource>, Func<TSource,Int32,IEnumerable<TResult>>)
SelectMany<TSource,TCollection,TResult>(IEnumerable<TSource>, Func<TSource,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)
SelectMany<TSource,TCollection,TResult>(IEnumerable<TSource>, Func<TSource,Int32,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)
SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)
SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)
Single<TSource>(IEnumerable<TSource>)
Single<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
SingleOrDefault<TSource>(IEnumerable<TSource>)
SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
Skip<TSource>(IEnumerable<TSource>, Int32)
SkipLast<TSource>(IEnumerable<TSource>, Int32)
SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)
Sum(IEnumerable<Decimal>)
Sum(IEnumerable<Double>)
Sum(IEnumerable<Int32>)
Sum(IEnumerable<Int64>)
Sum(IEnumerable<Nullable<Decimal>>)
Sum(IEnumerable<Nullable<Double>>)
Sum(IEnumerable<Nullable<Int32>>)
Sum(IEnumerable<Nullable<Int64>>)
Sum(IEnumerable<Nullable<Single>>)
Sum(IEnumerable<Single>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Double>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Single>)
Take<TSource>(IEnumerable<TSource>, Int32)
TakeLast<TSource>(IEnumerable<TSource>, Int32)
TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)
ToArray<TSource>(IEnumerable<TSource>)
ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)
ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
ToHashSet<TSource>(IEnumerable<TSource>)
ToHashSet<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)
ToList<TSource>(IEnumerable<TSource>)
ToLookup<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)
ToLookup<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)
ToLookup<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)
ToLookup<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)
Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)
Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)
Where<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)
Where<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)
Zip<TFirst,TSecond,TResult>(IEnumerable<TFirst>, IEnumerable<TSecond>, Func<TFirst,TSecond,TResult>)
AsParallel(IEnumerable)
AsParallel<TSource>(IEnumerable<TSource>)
AsQueryable(IEnumerable)
AsQueryable<TElement>(IEnumerable<TElement>)
Ancestors<T>(IEnumerable<T>)
Ancestors<T>(IEnumerable<T>, XName)
AncestorsAndSelf(IEnumerable<XElement>)
AncestorsAndSelf(IEnumerable<XElement>, XName)
Attributes(IEnumerable<XElement>)
Attributes(IEnumerable<XElement>, XName)
DescendantNodes<T>(IEnumerable<T>)
DescendantNodesAndSelf(IEnumerable<XElement>)
Descendants<T>(IEnumerable<T>)
Descendants<T>(IEnumerable<T>, XName)
DescendantsAndSelf(IEnumerable<XElement>)
DescendantsAndSelf(IEnumerable<XElement>, XName)
Elements<T>(IEnumerable<T>)
Elements<T>(IEnumerable<T>, XName)
InDocumentOrder<T>(IEnumerable<T>)
Nodes<T>(IEnumerable<T>)
Remove(IEnumerable<XAttribute>)
Remove<T>(IEnumerable<T>)