Microsoft.Extensions.Primitives 9.0.0

About

Microsoft.Extensions.Primitives contains isolated types that are used in many places within console or ASP.NET Core applications using framework extensions.

Key Features

  • IChangeToken: An interface that represents a token that can notify when a change occurs. This can be used to trigger actions or invalidate caches when something changes. For example, the configuration and file providers libraries use this interface to reload settings or files when they are modified.
  • StringValues: A struct that represents a single string or an array of strings. This can be used to efficiently store and manipulate multiple values that are logically a single value. For example, the HTTP headers and query strings libraries use this struct to handle multiple values for the same key.
  • StringSegment: A struct that represents a substring of another string. This can be used to avoid allocating new strings when performing operations on parts of a string. For example, the configuration and logging libraries use this struct to parse and format strings.

How to Use

IChangeToken with configuration example

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Primitives;
using System;

class Program
{
    static void Main(string[] args)
    {
        // Create a configuration builder
        var configurationBuilder = new ConfigurationBuilder()
            .SetBasePath(Environment.CurrentDirectory)
            // appsettings.json expected to have the following contents:
            // {
            //   "SomeKey": "SomeValue"
            // }
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);

        // Build the configuration
        IConfiguration configuration = configurationBuilder.Build();

        // Create a change token for the configuration
        IChangeToken changeToken = configuration.GetReloadToken();

        // Attach a change callback
        IDisposable changeTokenRegistration = changeToken.RegisterChangeCallback(state =>
        {
            Console.WriteLine("Configuration changed!");
            IConfigurationRoot root = (IConfigurationRoot)state;
            var someValue = root["SomeKey"]; // Access the updated configuration value
            Console.WriteLine($"New value of SomeKey: {someValue}");
        }, configuration);

        // go and update the value of the key SomeKey in appsettings.json.
        // The change callback will be invoked when the file is saved.
        Console.WriteLine("Listening for configuration changes. Press any key to exit.");
        Console.ReadKey();

        // Clean up the change token registration when no longer needed
        changeTokenRegistration.Dispose();
    }
}

StringValues example

using System;
using Microsoft.Extensions.Primitives;

namespace StringValuesSample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a StringValues object from a single string or an array of strings
            StringValues single = "Hello";
            StringValues multiple = new string[] { "Hello", "World" };

            // Use the implicit conversion to string or the ToString method to get the values
            Console.WriteLine($"Single: {single}"); // Single: Hello
            Console.WriteLine($"Multiple: {multiple}"); // Multiple: Hello,World

            // Use the indexer, the Count property, and the IsNullOrEmpty method to access the values
            Console.WriteLine($"Multiple[1]: {multiple[1]}"); // Multiple[1]: World
            Console.WriteLine($"Single.Count: {single.Count}"); // Single.Count: 1
            Console.WriteLine($"Multiple.IsNullOrEmpty: {StringValues.IsNullOrEmpty(multiple)}"); // Multiple.IsNullOrEmpty: False

            // Use the Equals method or the == operator to compare two StringValues objects
            Console.WriteLine($"single == \"Hello\": {single == "Hello"}"); // single == "Hello": True
            Console.WriteLine($"multiple == \"Hello\": {multiple == "Hello"}"); // multiple == "Hello": False
       }
    }
}

Main Types

The main types provided by this library are:

  • IChangeToken
  • StringValues
  • StringSegment

Additional Documentation

Feedback & Contributing

Microsoft.Extensions.Primitives is released as open source under the MIT license. Bug reports and contributions are welcome at the GitHub repository.

Showing the top 20 packages that depend on Microsoft.Extensions.Primitives.

Packages Downloads
Microsoft.AspNetCore.ResponseCaching.Abstractions
ASP.NET Core response caching middleware abstractions and feature interface definitions.
68
Microsoft.Extensions.Caching.Abstractions
Caching abstractions for in-memory cache and distributed cache. Commonly used types: Microsoft.Extensions.Caching.Distributed.IDistributedCache Microsoft.Extensions.Caching.Memory.IMemoryCache
63
Microsoft.AspNetCore.ResponseCaching.Abstractions
ASP.NET Core response caching middleware abstractions and feature interface definitions.
60
Microsoft.AspNetCore.WebUtilities
ASP.NET Core utilities, such as for working with forms, multipart messages, and query strings.
59
Microsoft.AspNetCore.Mvc.TagHelpers
ASP.NET Core MVC default tag helpers. Contains tag helpers for anchor tags, HTML input elements, caching, scripts, links (for CSS), and more. This package was built from the source code at https://github.com/aspnet/Mvc/tree/a6199bbfbab05583f987bae322fb04566841aaea
58
Microsoft.Net.Http.Headers
HTTP header parser implementations.
57
Microsoft.AspNetCore.ResponseCaching.Abstractions
ASP.NET Core response caching middleware abstractions and feature interface definitions.
56
Microsoft.Extensions.FileProviders.Composite
Composite file and directory providers for Microsoft.Extensions.FileProviders.
54
Microsoft.Extensions.FileProviders.Composite
Composite file and directory providers for Microsoft.Extensions.FileProviders. When using NuGet 3.x this package requires at least version 3.4.
54
Microsoft.Extensions.Options
Provides a strongly typed way of specifying and accessing settings using dependency injection.
54
Microsoft.AspNetCore.Mvc.TagHelpers
ASP.NET Core MVC default tag helpers. Contains tag helpers for anchor tags, HTML input elements, caching, scripts, links (for CSS), and more.
53
Microsoft.AspNetCore.Http.Features
ASP.NET Core HTTP feature interface definitions. This package was built from the source code at https://github.com/dotnet/aspnetcore/tree/c0ae1d179dba6f3acd0e55be55718c97c9028698
52
Microsoft.AspNetCore.Mvc.TagHelpers
ASP.NET Core MVC default tag helpers. Contains tag helpers for anchor tags, HTML input elements, caching, scripts, links (for CSS), and more.
52
Microsoft.AspNetCore.WebUtilities
ASP.NET Core utilities, such as for working with forms, multipart messages, and query strings.
51
Microsoft.Extensions.FileProviders.Abstractions
Abstractions of files and directories. Commonly used types: Microsoft.Extensions.FileProviders.IDirectoryContents Microsoft.Extensions.FileProviders.IFileInfo Microsoft.Extensions.FileProviders.IFileProvider
51
Microsoft.Net.Http.Headers
HTTP header parser implementations.
51
Microsoft.AspNetCore.Mvc.TagHelpers
ASP.NET Core MVC default tag helpers. Contains tag helpers for anchor tags, HTML input elements, caching, scripts, links (for CSS), and more.
50
Microsoft.AspNetCore.ResponseCaching.Abstractions
ASP.NET Core response caching middleware abstractions and feature interface definitions. This package was built from the source code at https://github.com/aspnet/ResponseCaching/tree/9f49398f28d7c1e0dc0305f8080351c413b0f297
50

.NET Framework 4.6.2

.NET 8.0

  • No dependencies.

.NET 9.0

  • No dependencies.

.NET Standard 2.0

Version Downloads Last updated
9.0.0 4 11/16/2024
9.0.0-rc.2.24473.5 8 10/25/2024
9.0.0-rc.1.24431.7 11 9/12/2024
9.0.0-preview.7.24405.7 17 8/13/2024
9.0.0-preview.6.24327.7 24 7/10/2024
9.0.0-preview.5.24306.7 13 6/14/2024
9.0.0-preview.4.24266.19 17 5/22/2024
9.0.0-preview.3.24172.9 15 4/27/2024
9.0.0-preview.2.24128.5 19 3/29/2024
9.0.0-preview.1.24080.9 21 2/23/2024
8.0.0 31 11/15/2023
8.0.0-rc.2.23479.6 28 10/31/2023
8.0.0-rc.1.23419.4 38 9/15/2023
8.0.0-preview.7.23375.6 26 8/22/2023
8.0.0-preview.6.23329.7 40 7/31/2023
8.0.0-preview.5.23280.8 37 7/28/2023
8.0.0-preview.4.23259.5 43 7/17/2023
8.0.0-preview.3.23174.8 39 5/12/2023
8.0.0-preview.2.23128.3 42 4/11/2023
8.0.0-preview.1.23110.8 34 2/23/2023
7.0.0 42 12/3/2022
7.0.0-rc.2.22472.3 45 10/21/2022
7.0.0-rc.1.22426.10 39 9/15/2022
7.0.0-preview.7.22375.6 35 9/15/2022
7.0.0-preview.6.22324.4 38 8/8/2022
7.0.0-preview.5.22301.12 30 6/27/2022
7.0.0-preview.4.22229.4 39 6/27/2022
7.0.0-preview.3.22175.4 46 6/27/2022
7.0.0-preview.2.22152.2 50 6/27/2022
7.0.0-preview.1.22076.8 38 6/27/2022
6.0.2-mauipre.1.22102.15 48 6/27/2022
6.0.2-mauipre.1.22054.8 45 6/27/2022
6.0.1 3 11/16/2024
6.0.0 40 6/27/2022
6.0.0-rc.2.21480.5 36 6/27/2022
6.0.0-rc.1.21451.13 52 6/27/2022
6.0.0-preview.7.21377.19 38 6/27/2022
6.0.0-preview.6.21352.12 53 6/27/2022
6.0.0-preview.5.21301.5 44 6/27/2022
6.0.0-preview.4.21253.7 44 6/27/2022
6.0.0-preview.3.21201.4 40 6/27/2022
6.0.0-preview.2.21154.6 45 6/27/2022
6.0.0-preview.1.21102.12 45 6/27/2022
5.0.1 40 6/27/2022
5.0.0 46 6/27/2022
5.0.0-rc.2.20475.5 46 6/27/2022
5.0.0-rc.1.20451.14 35 6/27/2022
5.0.0-preview.8.20407.11 42 6/27/2022
5.0.0-preview.7.20364.11 42 6/27/2022
5.0.0-preview.6.20305.6 31 6/26/2022
5.0.0-preview.5.20278.1 49 6/26/2022
5.0.0-preview.4.20251.6 50 6/26/2022
5.0.0-preview.3.20215.2 46 6/26/2022
5.0.0-preview.2.20160.3 49 6/26/2022
5.0.0-preview.1.20120.4 47 6/26/2022
3.1.32 44 2/21/2023
3.1.31 35 12/2/2022
3.1.30 34 10/13/2022
3.1.29 39 9/15/2022
3.1.28 48 9/15/2022
3.1.27 54 9/15/2022
3.1.26 36 6/26/2022
3.1.25 35 6/26/2022
3.1.24 41 6/26/2022
3.1.23 37 6/26/2022
3.1.22 34 6/26/2022
3.1.21 33 6/26/2022
3.1.20 39 6/26/2022
3.1.19 52 6/26/2022
3.1.18 38 6/26/2022
3.1.17 41 6/26/2022
3.1.16 39 6/26/2022
3.1.15 41 6/26/2022
3.1.14 42 6/26/2022
3.1.13 34 6/26/2022
3.1.12 41 6/26/2022
3.1.11 47 6/26/2022
3.1.10 37 6/26/2022
3.1.9 44 6/26/2022
3.1.8 56 6/26/2022
3.1.7 39 6/26/2022
3.1.6 40 6/26/2022
3.1.5 51 6/26/2022
3.1.4 46 6/26/2022
3.1.3 49 6/26/2022
3.1.2 53 6/26/2022
3.1.1 36 6/26/2022
3.1.0 35 6/26/2022
3.1.0-preview3.19553.2 42 6/26/2022
3.1.0-preview2.19525.4 44 6/26/2022
3.1.0-preview1.19506.1 46 6/26/2022
3.0.3 42 6/26/2022
3.0.2 49 6/26/2022
3.0.1 39 6/26/2022
3.0.0 52 6/26/2022
3.0.0-rc1.19456.10 42 6/26/2022
3.0.0-preview9.19423.4 39 6/26/2022
3.0.0-preview8.19405.4 37 6/26/2022
3.0.0-preview7.19362.4 44 6/26/2022
3.0.0-preview6.19304.6 42 6/26/2022
3.0.0-preview5.19227.9 40 6/26/2022
3.0.0-preview4.19216.2 42 6/26/2022
3.0.0-preview3.19153.1 45 6/26/2022
3.0.0-preview.19074.2 36 6/26/2022
3.0.0-preview.18572.1 39 6/26/2022
2.2.0 42 6/26/2022
2.2.0-preview3-35497 36 6/26/2022
2.2.0-preview2-35157 40 6/26/2022
2.2.0-preview1-35029 39 6/26/2022
2.1.6 41 6/26/2022
2.1.1 42 6/26/2022
2.1.0 43 6/26/2022
2.1.0-rc1-final 47 6/26/2022
2.1.0-preview2-final 33 6/26/2022
2.1.0-preview1-final 37 6/26/2022
2.0.0 39 6/26/2022
2.0.0-preview2-final 43 6/26/2022
2.0.0-preview1-final 38 6/26/2022
1.1.1 40 6/13/2022
1.1.0 29 6/26/2022
1.1.0-preview1-final 41 6/26/2022
1.0.1 50 6/26/2022
1.0.0 31 6/26/2022
1.0.0-rc2-final 52 6/26/2022
1.0.0-rc1-final 33 6/26/2022