Top 20 NuGet appsettings Packages

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This T4 template that generates a static class to access your app.config and web.config settings.
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The FSharp.Configuration project contains type providers for the configuration of .NET projects.
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A long description of the package. This shows up in the right pane of the Add Package Dialog as well as in the Package Manager Console when listing packages using the Get-Package command.
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Contains an implementation of a overrider for AppConfig for the Invisionware Settings Library
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Contains an implementation of a overrider for CommandLineParser for the Invisionware Settings Library
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Contains a generalize implementation for handling complex configuration/settings within an application. Based off the design of Serilog
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An abstraction of appsettings allowing easy and testable retrieval of settings from arbitrary sources.
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Provides up to date application setting values
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A Simple Dynamic Wrapper around the .NET web.config app settings that gives strongly typed access to app settings. Easily Mockable and extensible.
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An abstraction of appsettings allowing easy and testable retrieval of settings asynchronously from arbitrary sources.
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Automagically parses (with reflection) an AppSettings/Dictionary/DataRow/DataTable to a custom class of yours.
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Makes mapping key/value stores (appSettings, environment variables, NameValueCollections...) to POCs dead simple and highly extensible.
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Enables appsettings reload onchange also drop dependency on IOptions<T>
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The Config Helper Pro Library has the ability to manage all your .NET configuration needs. Read/write to the registry, application/web config, and INI files with a single line of code. Everything is 100% managed code.
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Makes mapping key/value stores (appSettings, environment variables, NameValueCollections...) to POCs dead simple and highly extensible.
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Provides a wrapper around ConfigurationManager.AppSettings to allow dependency injections
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Contains an implementation of a overrider for AzureConfigurationManager for the Invisionware Settings Library
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AppSettings source for smartconf. Visit https://github.com/nemec/smartconf.sources for more information.
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Enables ELMAH SqlErrorLog to read connection string from AppSettings
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Simple auto-mapping of configuration settings to POCOs.