import security only when it's required

Author: HugoMario

src/main/java/io/swagger/codegen/v3/generators/dotnet/AbstractCSharpCodegen.java

@@ -535,6 +535,7 @@ public void updateCodegenPropertyEnum(CodegenProperty var) {
     public Map<String, Object> postProcessOperations(Map<String, Object> objs) {
         super.postProcessOperations(objs);
         if (objs != null) {
+            boolean hasAuthMethods = false;
             Map<String, Object> operations = (Map<String, Object>) objs.get("operations");
             if (operations != null) {
                 List<CodegenOperation> ops = (List<CodegenOperation>) operations.get("operation");
@@ -583,8 +584,12 @@ public Map<String, Object> postProcessOperations(Map<String, Object> objs) {
                     }
 
                     processOperation(operation);
+                    if (getBooleanValue(operation, CodegenConstants.HAS_AUTH_METHODS_EXT_NAME)) {
+                        hasAuthMethods = true;
+                    }
                 }
             }
+            objs.put("hasAuthMethods", hasAuthMethods);
         }
 
         return objs;

src/main/resources/handlebars/aspnetcore/3.0/Startup.mustache

@@ -14,7 +14,7 @@ using Newtonsoft.Json.Serialization;
 using Swashbuckle.AspNetCore.Swagger;
 using Swashbuckle.AspNetCore.SwaggerGen;
 using {{packageName}}.Filters;
-using {{packageName}}.Security;
+{{#hasAuthMethods}}using {{packageName}}.Security;{{/hasAuthMethods}}
 
 namespace {{packageName}}
 {

src/main/resources/mustache/aspnetcore/3.0/Startup.mustache

@@ -14,7 +14,7 @@ using Newtonsoft.Json.Serialization;
 using Swashbuckle.AspNetCore.Swagger;
 using Swashbuckle.AspNetCore.SwaggerGen;
 using {{packageName}}.Filters;
-using {{packageName}}.Security;
+{{#hasAuthMethods}}using {{packageName}}.Security;{{/hasAuthMethods}}
 
 namespace {{packageName}}
 {