[csharp] Making example code snippet compilable (#3019)

* fix(okhttp-gson): Updating example

* fix(csharp): Updating example

* fix(csharp): Updating pet project

* fix(csharp): Updating example

Author: saigiridhar21

modules/openapi-generator/src/main/resources/csharp/README.mustache

@@ -102,7 +102,6 @@ Then, publish to a [local feed](https://docs.microsoft.com/en-us/nuget/hosting-p
 ## Getting Started
 
 ```csharp
-using System;
 using System.Diagnostics;
 using {{packageName}}.{{apiPackage}};
 using {{packageName}}.Client;
@@ -112,9 +111,10 @@ namespace Example
 {
     public class {{operationId}}Example
     {
-        public void main()
+        public static void Main()
         {
 {{#apiInfo}}{{#apis}}{{#-first}}{{#operations}}{{#operation}}{{#-first}}
+            Configuration.Default.BasePath = "{{{basePath}}}";
             {{#hasAuthMethods}}
             {{#authMethods}}
             {{#isBasic}}
@@ -135,7 +135,7 @@ namespace Example
             {{/authMethods}}
 
             {{/hasAuthMethods}}
-            var apiInstance = new {{classname}}();
+            var apiInstance = new {{classname}}(Configuration.Default);
             {{#allParams}}
             {{#isPrimitiveType}}
             var {{paramName}} = {{{example}}};  // {{{dataType}}} | {{{description}}}{{^required}} (optional) {{/required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}
@@ -153,9 +153,11 @@ namespace Example
                 {{#returnType}}{{{.}}} result = {{/returnType}}apiInstance.{{{operationId}}}({{#allParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}});{{#returnType}}
                 Debug.WriteLine(result);{{/returnType}}
             }
-            catch (Exception e)
+            catch (ApiException e)
             {
                 Debug.Print("Exception when calling {{classname}}.{{operationId}}: " + e.Message );
+                Debug.Print("Status Code: "+ e.ErrorCode);
+                Debug.Print(e.StackTrace);
             }
 {{/-first}}{{/operation}}{{/operations}}{{/-first}}{{/apis}}{{/apiInfo}}
         }

modules/openapi-generator/src/main/resources/csharp/api_doc.mustache

@@ -23,7 +23,6 @@ Method | HTTP request | Description
 ### Example
 
 ```csharp
-using System;
 using System.Diagnostics;
 using {{packageName}}.{{apiPackage}};
 using {{packageName}}.Client;
@@ -33,8 +32,9 @@ namespace Example
 {
     public class {{operationId}}Example
     {
-        public void main()
+        public static void Main()
         {
+            Configuration.Default.BasePath = "{{{basePath}}}";
             {{#hasAuthMethods}}
             {{#authMethods}}
             {{#isBasic}}
@@ -55,7 +55,7 @@ namespace Example
             {{/authMethods}}
 
             {{/hasAuthMethods}}
-            var apiInstance = new {{classname}}();
+            var apiInstance = new {{classname}}(Configuration.Default);
             {{#allParams}}
             {{#isPrimitiveType}}
             var {{paramName}} = {{{example}}};  // {{{dataType}}} | {{{description}}}{{^required}} (optional) {{/required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}
@@ -73,9 +73,11 @@ namespace Example
                 {{#returnType}}{{returnType}} result = {{/returnType}}apiInstance.{{{operationId}}}({{#allParams}}{{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}});{{#returnType}}
                 Debug.WriteLine(result);{{/returnType}}
             }
-            catch (Exception e)
+            catch (ApiException e)
             {
                 Debug.Print("Exception when calling {{classname}}.{{operationId}}: " + e.Message );
+                Debug.Print("Status Code: "+ e.ErrorCode);
+                Debug.Print(e.StackTrace);
             }
         }
     }

samples/client/petstore/csharp/OpenAPIClient/README.md

@@ -64,7 +64,6 @@ Then, publish to a [local feed](https://docs.microsoft.com/en-us/nuget/hosting-p
 ## Getting Started
 
 ```csharp
-using System;
 using System.Diagnostics;
 using Org.OpenAPITools.Api;
 using Org.OpenAPITools.Client;
@@ -74,10 +73,11 @@ namespace Example
 {
     public class Example
     {
-        public void main()
+        public static void Main()
         {
 
-            var apiInstance = new AnotherFakeApi();
+            Configuration.Default.BasePath = "http://petstore.swagger.io:80/v2";
+            var apiInstance = new AnotherFakeApi(Configuration.Default);
             var body = new ModelClient(); // ModelClient | client model
 
             try
@@ -86,9 +86,11 @@ namespace Example
                 ModelClient result = apiInstance.Call123TestSpecialTags(body);
                 Debug.WriteLine(result);
             }
-            catch (Exception e)
+            catch (ApiException e)
             {
                 Debug.Print("Exception when calling AnotherFakeApi.Call123TestSpecialTags: " + e.Message );
+                Debug.Print("Status Code: "+ e.ErrorCode);
+                Debug.Print(e.StackTrace);
             }
 
         }

samples/client/petstore/csharp/OpenAPIClient/docs/AnotherFakeApi.md

@@ -19,7 +19,6 @@ To test special tags and operation ID starting with number
 ### Example
 
 ```csharp
-using System;
 using System.Diagnostics;
 using Org.OpenAPITools.Api;
 using Org.OpenAPITools.Client;
@@ -29,9 +28,10 @@ namespace Example
 {
     public class Call123TestSpecialTagsExample
     {
-        public void main()
+        public static void Main()
         {
-            var apiInstance = new AnotherFakeApi();
+            Configuration.Default.BasePath = "http://petstore.swagger.io:80/v2";
+            var apiInstance = new AnotherFakeApi(Configuration.Default);
             var body = new ModelClient(); // ModelClient | client model
 
             try
@@ -40,9 +40,11 @@ namespace Example
                 ModelClient result = apiInstance.Call123TestSpecialTags(body);
                 Debug.WriteLine(result);
             }
-            catch (Exception e)
+            catch (ApiException e)
             {
                 Debug.Print("Exception when calling AnotherFakeApi.Call123TestSpecialTags: " + e.Message );
+                Debug.Print("Status Code: "+ e.ErrorCode);
+                Debug.Print(e.StackTrace);
             }
         }
     }