Created Sample Project for Variable in Variable feature

Author: CodingMadeEasy

Samples/Samples.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26124.0
+MinimumVisualStudioVersion = 15.0.26124.0
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VariableInVariable", "VariableInVariable\VariableInVariable.csproj", "{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EnvironmentVariables", "EnvironmentVariables\EnvironmentVariables.csproj", "{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Debug|x64.ActiveCfg = Debug|x64
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Debug|x64.Build.0 = Debug|x64
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Debug|x86.ActiveCfg = Debug|x86
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Debug|x86.Build.0 = Debug|x86
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Release|Any CPU.Build.0 = Release|Any CPU
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Release|x64.ActiveCfg = Release|x64
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Release|x64.Build.0 = Release|x64
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Release|x86.ActiveCfg = Release|x86
+		{457E88B8-BBC0-4342-82F0-D4A7E12B1C73}.Release|x86.Build.0 = Release|x86
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Debug|x64.ActiveCfg = Debug|x64
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Debug|x64.Build.0 = Debug|x64
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Debug|x86.ActiveCfg = Debug|x86
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Debug|x86.Build.0 = Debug|x86
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Release|x64.ActiveCfg = Release|x64
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Release|x64.Build.0 = Release|x64
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Release|x86.ActiveCfg = Release|x86
+		{DACEC79B-DF40-4FB7-90DC-9FF6CE58A0CC}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+EndGlobal

Samples/VariableInVariable/Program.cs

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+using System;
+using C9S.Extensions.Configuration;
+using Microsoft.Extensions.Configuration;
+
+namespace VariableInVariable
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var builder = new ConfigurationBuilder()    
+                .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
+                .AddJsonFile($"appsettings.json", optional: true)
+                .AddEnvironmentVariables();
+
+            var configuration = builder.Build();
+
+            configuration.ResolveVariables();
+
+            Console.WriteLine(configuration.GetSection("Auth:ClientID"));
+        }
+    }
+}

Samples/VariableInVariable/VariableInVariable.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="2.1.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="2.1.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.1.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\C9S.Extensions.Configuration\C9S.Extensions.Configuration.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Update="appsettings.json" CopyToOutputDirectory="Always" />
+  </ItemGroup>
+</Project>

Samples/VariableInVariable/appsettings.json

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+{
+    "App":
+    {
+        "Development": {
+            "ClientId": "FooId"
+        }
+    },
+    "Auth":
+    {
+        "ClientID": "{{App.{{ASPNETCORE_ENVIRONMENT}}.ClientId}}"
+    }
+}