add csharp example

Signed-off-by: Sarthak Sharma <sartsharma@microsoft.com>

configuration/csharp/http/README.md

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+# Dapr Configuration API
+
+In this quickstart, you'll create a microservice which makes use of Dapr's Configuration API. Configuration items are key/value pairs containing configuration data such as app ids, partition keys, database names etc. The service gets configuration items from the configuration store and subscribes for configuration updates.
+
+Visit [this](https://docs.dapr.io/developing-applications/building-blocks/configuration/) link for more information about Dapr and Configuration API.
+
+> **Note:** This example leverages HTTP `requests` only.  If you are looking for the example using the Dapr Client SDK (recommended) [click here](../sdk/).
+
+This quickstart includes one service:
+
+- Dotnet service `order-processor`
+
+## Run order-updater app
+
+> **Note:** `order-updater` app adds configuration items to the configuration store and keeps updating their value to simulate dynamic changes to configuration data. You need to start and keep it running before running `order-processor` service.
+
+1. Navigate to [`order-updater`](./../../order-updater/) directory.
+2. Check the [`Readme`](./../../order-updater/README.md) to start the app and keep it running in the terminal.
+
+<!-- STEP
+name: Run order-updater service
+background: true
+timeout: 90
+-->
+
+```bash
+cd ./../../order-updater
+go run .
+```
+
+<!-- END_STEP -->
+
+1. This will add configuration items to redis config store and keep updating their values.
+
+## Run order-processor
+
+1. Open a new terminal and navigate to `order-processor` directory.
+2. Run the service app with Dapr.
+
+<!-- STEP
+name: Run order-processor service
+expected_stdout_lines:
+  - '== APP == Configuration for orderId1: {"orderId1":{"value":'
+  - '== APP == Configuration for orderId2: {"orderId2":{"value":'
+  - '== APP == App subscribed to config changes with subscription id:'
+  - '== APP == Configuration update {"orderId1":{"value":'
+  - '== APP == Configuration update {"orderId2":{"value":'
+  - "Exited App successfully"
+expected_stderr_lines:
+output_match_mode: substring
+match_order: none
+timeout: 30
+-->
+
+```bash
+cd ./order-processor
+dapr run --app-id order-processor-http --components-path ../../../components/ --app-port 7001 -- dotnet run --project .
+```
+
+<!-- END_STEP -->

configuration/csharp/http/makefile

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+include ../../../docker.mk
+include ../../../validate.mk

configuration/csharp/http/order-processor/Program.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+var builder = WebApplication.CreateBuilder(args);
+
+var app = builder.Build();
+
+var baseURL = (Environment.GetEnvironmentVariable("BASE_URL") ?? "http://localhost") + ":"
++ (Environment.GetEnvironmentVariable("DAPR_HTTP_PORT") ?? "3500");
+
+const string DAPR_CONFIGURATION_STORE = "configstore";
+
+var CONFIGURATION_ITEMS = new List<string> { "orderId1", "orderId2" };
+
+var httpClient = new HttpClient();
+httpClient.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
+
+foreach (var item in CONFIGURATION_ITEMS)
+{
+  // Get config items from the config store
+  try
+  {
+    var response = await httpClient.GetStringAsync($"{baseURL}/v1.0-alpha1/configuration/{DAPR_CONFIGURATION_STORE}?key={item.ToString()}");
+    Console.WriteLine("Configuration for " + item + ": " + response);
+  }
+  catch (Exception ex)
+  {
+    Console.WriteLine("Could not get config item, err:" + ex.Message);
+  }
+}
+
+async Task subscribeToConfigUpdates()
+{
+  // Add delay to allow app channel to be ready
+  Thread.Sleep(3000);
+  var subscription = await httpClient.GetStringAsync($"{baseURL}/v1.0-alpha1/configuration/{DAPR_CONFIGURATION_STORE}/subscribe");
+  // subscription.EnsureSuccessStatusCode();
+  Console.WriteLine("App subscribed to config changes with subscription id: " + subscription);
+}
+
+async Task readConfigurationChanges()
+{
+  // Create POST endpoint to receive config updates
+  app.MapPost("/configuration/configstore/{item}", async (HttpRequest request) =>
+  {
+    using var sr = new StreamReader(request.Body);
+    var config = await sr.ReadToEndAsync();
+    dynamic update = JObject.Parse(config);
+    Console.WriteLine("Configuration update "+ update.items.ToString(Formatting.None));
+  });
+  await app.StartAsync();
+}
+
+await readConfigurationChanges();
+await subscribeToConfigUpdates();
+
+// Exit the app after 20 seconds
+await Task.Delay(20000);
+
+
+

configuration/csharp/http/order-processor/Program.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
+  </ItemGroup>
+
+</Project>

configuration/csharp/http/order-processor/Properties/launchSettings.json

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+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+     "CheckoutService": {
+      "commandName": "Project",
+      "dotnetRunMessages": "true",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:7001",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

configuration/csharp/http/order-processor/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

configuration/csharp/http/order-processor/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*"
+}

configuration/csharp/sdk/README.md

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+# Dapr Configuration API
+
+In this quickstart, you'll create a microservice which makes use of Dapr's Configuration API. Configuration items are key/value pairs containing configuration data such as app ids, partition keys, database names etc. The service gets configuration items from the configuration store and subscribes for configuration updates.
+
+Visit [this](https://docs.dapr.io/developing-applications/building-blocks/configuration/) link for more information about Dapr and Configuration API.
+
+This quickstart includes one service:
+
+- Dotnet service `order-processor`
+
+## Run order-updater app
+
+> **Note:** `order-updater` app adds configuration items to the configuration store and keeps updating their value to simulate dynamic changes to configuration data. You need to start and keep it running before running `order-processor` service.
+
+1. Navigate to [`order-updater`](./../../order-updater/) directory.
+2. Check the [`Readme`](./../../order-updater/README.md) to start the app and keep it running in the terminal.
+
+<!-- STEP
+name: Run order-updater service
+background: true
+timeout: 90
+-->
+
+```bash
+cd ./../../order-updater
+go run .
+```
+
+<!-- END_STEP -->
+
+3. This will add configuration items to redis config store and keep updating their values.
+
+## Run order-processor
+
+1. Open a new terminal and navigate to `order-processor` directory.
+2. Run the service app with Dapr.
+
+<!-- STEP
+name: Run order-processor service
+expected_stdout_lines:
+  - '== APP == Configuration for orderId1: {"Value":'
+  - '== APP == Configuration for orderId2: {"Value":'
+  - '== APP == App subscribed to config changes with subscription id:'
+  - '== APP == Configuration update {"orderId1":{"Value":'
+  - '== APP == Configuration update {"orderId2":{"Value":'
+  - "Exited App successfully"
+expected_stderr_lines:
+output_match_mode: substring
+match_order: none
+timeout: 30
+-->
+
+```bash
+cd ./order-processor
+dapr run --app-id order-processor-http --components-path ../../../components/ --app-port 7001 -- dotnet run --project .
+```
+
+<!-- END_STEP -->

configuration/csharp/sdk/makefile

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+include ../../../docker.mk
+include ../../../validate.mk

configuration/csharp/sdk/order-processor/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Dapr.Client;
+
+const string DAPR_CONFIGURATION_STORE = "configstore";
+var CONFIGURATION_ITEMS  = new List<string> { "orderId1", "orderId2" };
+
+var client = new DaprClientBuilder().Build();
+
+// Get config from configuration store
+GetConfigurationResponse config = await client.GetConfiguration(DAPR_CONFIGURATION_STORE, CONFIGURATION_ITEMS );
+foreach (var item in config.Items)
+{
+  var cfg = System.Text.Json.JsonSerializer.Serialize(item.Value);
+  Console.WriteLine("Configuration for " + item.Key + ": " + cfg);
+}
+
+// Exit the app after 20 seconds
+var shutdownTimer = new System.Timers.Timer();
+shutdownTimer.Interval = 20000;
+shutdownTimer.Elapsed += (o, e) => Environment.Exit(0);
+shutdownTimer.Start();
+
+// Subscribe for configuration changes
+SubscribeConfigurationResponse subscribe = await client.SubscribeConfiguration(DAPR_CONFIGURATION_STORE, CONFIGURATION_ITEMS );
+
+// Print configuration changes
+await foreach (var configItem in subscribe.Source)
+{
+  // First invocation when app subscribes to config changes only returns subscription id
+  if (configItem.Keys.Count == 0)
+  {
+    Console.WriteLine("App subscribed to config changes with subscription id: " + subscribe.Id);
+    continue;
+  }
+  var cfg = System.Text.Json.JsonSerializer.Serialize(configItem);
+  Console.WriteLine("Configuration update " + cfg);
+}
+

configuration/csharp/sdk/order-processor/Program.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Dapr.AspNetCore" Version="1.9.0" />
+  </ItemGroup>
+
+</Project>