Ramstack.FileProviders.Composition 2.2.1

Ramstack.FileProviders.Composition

Represents a .NET library that provides a helper class for flattening and composing IFileProvider instances.

Getting Started

To install the Ramstack.FileProviders.Composition NuGet package in your project, run the following command:

dotnet add package Ramstack.FileProviders.Composition

Flattening Providers

The FlattenProvider method attempts to flatten a given IFileProvider into a single list of file providers.

This is especially useful when dealing with nested CompositeFileProvider instances, which might have been created during different stages of a pipeline or configuration. Flattening helps in removing unnecessary indirectness and improving efficiency by consolidating all file providers into a single level.

var builder = WebApplication.CreateBuilder(args);

// Application pipeline configuration
...

builder.Environment.ContentRootFileProvider = FileProviderComposer.FlattenProvider(
    builder.Environment.ContentRootFileProvider);

Composing Providers

The ComposeProviders method combines a list of IFileProvider instances into a single IFileProvider. During this process, all encountered CompositeFileProvider instances recursively flattened and merged into a single level. This eliminates unnecessary indirectness and streamline the file provider hierarchy.

string packagesPath = Path.Combine(environment.ContentRootPath, "../Packages");
string themesPath   = Path.Combine(environment.ContentRootPath, "../Themes");

environment.ContentRootFileProvider = FileProviderComposer.ComposeProviders(
    // Inject external Modules directory
    new PrefixedFileProvider("/Packages", new PhysicalFileProvider(packagesPath)),

    // Inject external Themes directory
    new PrefixedFileProvider("/Themes", new PhysicalFileProvider(themesPath)),

    // Current provider
    environment.ContentRootFileProvider);

In this example, the ComposeProviders method handles any unnecessary nesting that might occur, including when the current environment.ContentRootFileProvider is a CompositeFileProvider. This ensures that all file providers merged into a single flat structure, avoiding unnecessary indirectness.

Related Packages

• Ramstack.FileProviders.Extensions — Useful and convenient extensions for IFileProvider, bringing its capabilities and experience closer to what's provided by the DirectoryInfo and FileInfo classes.
• Ramstack.FileProviders — Additional file providers, including ZipFileProvider, PrefixedFileProvider, and SubFileProvider.
• Ramstack.FileProviders.Globbing — A file provider that filters files using include and/or exclude glob patterns. Include patterns make only matching files visible, while exclude patterns hide specific files. Both include and exclude patterns can be combined for flexible file visibility control.

Supported versions

Contributions

Bug reports and contributions are welcome.

License

This package is released as open source under the MIT License. See the LICENSE file for more details.