Add StronglyTypedValidation

Author: andrewlock

StronglyTypedValidation/Program.cs

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+using System.ComponentModel.DataAnnotations;
+using Microsoft.Extensions.Options;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Register the IOptions object
+// builder.Services.Configure<SlackApiSettings>(
+//     builder.Configuration.GetSection("SlackApi")); 
+
+builder.Services.AddOptions<SlackApiSettings>()
+    .BindConfiguration("SlackApi")
+    .ValidateDataAnnotations() // <- Enable validation
+    .ValidateOnStart(); // <- Validate on app start
+
+// Explicitly register the settings object by delegating to the IOptions object
+builder.Services.AddSingleton(resolver => 
+        resolver.GetRequiredService<IOptions<SlackApiSettings>>().Value);
+
+var app = builder.Build();
+
+// app.MapGet("/", (IOptions<SlackApiSettings> options) => options.Value);
+app.MapGet("/", (SlackApiSettings options) => options);
+
+app.Run();
+
+public class SlackApiSettings
+{
+    [Required, Url]
+    public string WebhookUrl { get; set; }
+    [Required]
+    public string DisplayName { get; set; }
+    public bool ShouldNotify { get; set; }
+}

StronglyTypedValidation/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:27028",
+      "sslPort": 44379
+    }
+  },
+  "profiles": {
+    "StronglyTypedValidation": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7282;http://localhost:5101",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

StronglyTypedValidation/StronglyTypedValidation.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>

StronglyTypedValidation/StronglyTypedValidation.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StronglyTypedValidation", "StronglyTypedValidation.csproj", "{7F73E113-C770-48B5-A006-4FD7D5148729}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7F73E113-C770-48B5-A006-4FD7D5148729}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7F73E113-C770-48B5-A006-4FD7D5148729}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7F73E113-C770-48B5-A006-4FD7D5148729}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7F73E113-C770-48B5-A006-4FD7D5148729}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

StronglyTypedValidation/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "SlackApi": {
+    "WebhookUrl": "http://example.com/test/url",
+    "DisplayName": null,
+    "ShouldNotify": true
+  }
+}