chore: clean up C# example (#143)

- Added the dependency on the JSII Roslyn analyzers package.
- Removed now-unnecessary `null` arguments for "default props".
- Upgraded Lambda's runtime to Node-10.x (Node-8.x being deprecated)

Author: RomainMuller

csharp/my-widget-service/cdk.json

@@ -1,3 +1,3 @@
 {
-  "app": "dotnet src/MyWidgetService/bin/Debug/netcoreapp2.1/MyWidgetService.dll"
+  "app": "dotnet src/MyWidgetService/bin/Debug/netcoreapp3.0/MyWidgetService.dll"
 }

csharp/my-widget-service/src/MyWidgetService/MyWidgetService.csproj

@@ -2,14 +2,15 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Amazon.CDK" Version="1.2.0-devpreview" />
-    <PackageReference Include="Amazon.CDK.AWS.ApiGateway" Version="1.2.0-devpreview" />
-    <PackageReference Include="Amazon.CDK.AWS.Lambda" Version="1.2.0-devpreview" />
-    <PackageReference Include="Amazon.CDK.AWS.S3" Version="1.2.0-devpreview" />
+    <PackageReference Include="Amazon.CDK" Version="1.14.0-devpreview" />
+    <PackageReference Include="Amazon.CDK.AWS.ApiGateway" Version="1.14.0-devpreview" />
+    <PackageReference Include="Amazon.CDK.AWS.Lambda" Version="1.14.0-devpreview" />
+    <PackageReference Include="Amazon.CDK.AWS.S3" Version="1.14.0-devpreview" />
+    <PackageReference Include="Amazon.JSII.Analyzers" Version="0.19.0" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>

csharp/my-widget-service/src/MyWidgetService/MyWidgetServiceStack.cs

@@ -6,22 +6,22 @@
 
 namespace MyWidgetService
 {
-    public class MyWidgetServiceStack : Stack
+    internal sealed class MyWidgetServiceStack : Stack
     {
         public MyWidgetServiceStack(Construct parent, string id, IStackProps props) : base(parent, id, props)
         {
-            var bucket = new Bucket(this, "WidgetStore", null);
+            var bucket = new Bucket(this, "WidgetStore");
 
             var handler = new Function(this, "WidgetHandler", new FunctionProps {
-                Runtime = Runtime.NODEJS_8_10,
-                Code = AssetCode.Asset("src/MyWidgetService/resources"),
+                Runtime = Runtime.NODEJS_10_X,
+                Code = Code.FromAsset("src/MyWidgetService/resources"),
                 Handler = "widgets.main",
-                Environment = new Dictionary<string, object>{
+                Environment = new Dictionary<string, string>{
                     { "BUCKET", bucket.BucketName }
                 }
             });
 
-            bucket.GrantReadWrite(handler, null);
+            bucket.GrantReadWrite(handler);
 
             var api = new RestApi(this, "widgets-api", new RestApiProps {
                 RestApiName = "Widget Service",
@@ -34,17 +34,17 @@ public MyWidgetServiceStack(Construct parent, string id, IStackProps props) : ba
                 },
             });
 
-            api.Root.AddMethod("GET", getWidgetsIntegration, null);
+            api.Root.AddMethod("GET", getWidgetsIntegration);
 
-            var widget = api.Root.AddResource("{id}", null);
+            var widget = api.Root.AddResource("{id}");
 
-            var postWidgetIntegration = new LambdaIntegration(handler, null);
-            var getWidgetIntegration = new LambdaIntegration(handler, null);
-            var deleteWidgetIntegration = new LambdaIntegration(handler, null);
+            var postWidgetIntegration = new LambdaIntegration(handler);
+            var getWidgetIntegration = new LambdaIntegration(handler);
+            var deleteWidgetIntegration = new LambdaIntegration(handler);
 
-            widget.AddMethod("POST", postWidgetIntegration, null);
-            widget.AddMethod("GET", getWidgetIntegration, null);
-            widget.AddMethod("DELETE", deleteWidgetIntegration, null);
+            widget.AddMethod("POST", postWidgetIntegration);
+            widget.AddMethod("GET", getWidgetIntegration);
+            widget.AddMethod("DELETE", deleteWidgetIntegration);
         }
     }
 }

csharp/my-widget-service/src/MyWidgetService/Program.cs

@@ -5,11 +5,11 @@
 
 namespace MyWidgetService
 {
-    class Program
+    public sealed class Program
     {
-        static void Main(string[] args)
+        public static void Main(string[] args)
         {
-            var app = new App(null);
+            var app = new App();
             new MyWidgetServiceStack(app, "MyWidgetServiceStack", new StackProps());
             app.Synth();
         }