Annotate Hosting with nullable

Author: pranavkm

src/Hosting/Abstractions/ref/Microsoft.AspNetCore.Hosting.Abstractions.csproj

@@ -2,6 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <Nullable>annotations</Nullable>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.AspNetCore.Hosting.Abstractions.netcoreapp.cs" />

src/Hosting/Abstractions/ref/Microsoft.AspNetCore.Hosting.Abstractions.netcoreapp.cs

@@ -93,8 +93,8 @@ public partial interface IWebHostBuilder
         Microsoft.AspNetCore.Hosting.IWebHostBuilder ConfigureAppConfiguration(System.Action<Microsoft.AspNetCore.Hosting.WebHostBuilderContext, Microsoft.Extensions.Configuration.IConfigurationBuilder> configureDelegate);
         Microsoft.AspNetCore.Hosting.IWebHostBuilder ConfigureServices(System.Action<Microsoft.AspNetCore.Hosting.WebHostBuilderContext, Microsoft.Extensions.DependencyInjection.IServiceCollection> configureServices);
         Microsoft.AspNetCore.Hosting.IWebHostBuilder ConfigureServices(System.Action<Microsoft.Extensions.DependencyInjection.IServiceCollection> configureServices);
-        string GetSetting(string key);
-        Microsoft.AspNetCore.Hosting.IWebHostBuilder UseSetting(string key, string value);
+        string? GetSetting(string key);
+        Microsoft.AspNetCore.Hosting.IWebHostBuilder UseSetting(string key, string? value);
     }
     public partial interface IWebHostEnvironment : Microsoft.Extensions.Hosting.IHostEnvironment
     {

src/Hosting/Abstractions/src/IWebHostBuilder.cs

@@ -50,14 +50,14 @@ public interface IWebHostBuilder
         /// </summary>
         /// <param name="key">The key of the setting to look up.</param>
         /// <returns>The value the setting currently contains.</returns>
-        string GetSetting(string key);
+        string? GetSetting(string key);
 
         /// <summary>
         /// Add or replace a setting in the configuration.
         /// </summary>
         /// <param name="key">The key of the setting to add or replace.</param>
         /// <param name="value">The value of the setting to add or replace.</param>
         /// <returns>The <see cref="IWebHostBuilder"/>.</returns>
-        IWebHostBuilder UseSetting(string key, string value);
+        IWebHostBuilder UseSetting(string key, string? value);
     }
-}
+}

src/Hosting/Abstractions/src/Microsoft.AspNetCore.Hosting.Abstractions.csproj

@@ -8,6 +8,7 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;hosting</PackageTags>
     <IsPackable>false</IsPackable>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>

src/Hosting/Abstractions/src/WebHostBuilderContext.cs

@@ -13,11 +13,11 @@ public class WebHostBuilderContext
         /// <summary>
         /// The <see cref="IWebHostEnvironment" /> initialized by the <see cref="IWebHost" />.
         /// </summary>
-        public IWebHostEnvironment HostingEnvironment { get; set; }
+        public IWebHostEnvironment HostingEnvironment { get; set; } = default!;
 
         /// <summary>
         /// The <see cref="IConfiguration" /> containing the merged configuration of the application and the <see cref="IWebHost" />.
         /// </summary>
-        public IConfiguration Configuration { get; set; }
+        public IConfiguration Configuration { get; set; } = default!;
     }
 }