Refactor configuration file handling in OpenApiCSharpCodeGenerator to ensure extension is not null before processing

Author: christianhelle

src/Core/ApiClientCodeGen.Core/Generators/OpenApi/OpenApiCSharpCodeGenerator.cs

@@ -81,15 +81,18 @@ public string GenerateCode(IProgressReporter? pGenerateProgress)
                 if (openApiGeneratorOptions.UseConfigurationFile)
                 {
                     var extension = Path.GetExtension(swaggerFile);
-                    var configFilename = swaggerFile.Replace(extension, $".config{extension}");
-                    var jsonConfigFilename = swaggerFile.Replace(extension, ".config.json");
-                    var yamlConfigFilename = swaggerFile.Replace(extension, ".config.yaml");
-
-                    var configFilenames = new[] { configFilename, jsonConfigFilename, yamlConfigFilename };
-                    var configFile = Array.Find(configFilenames, File.Exists);
-                    if (configFile != null)
+                    if (extension != null)
                     {
-                        arguments += $"-c \"{configFile}\" ";
+                        var configFilename = swaggerFile.Replace(extension, $".config{extension}");
+                        var jsonConfigFilename = swaggerFile.Replace(extension, ".config.json");
+                        var yamlConfigFilename = swaggerFile.Replace(extension, ".config.yaml");
+
+                        var configFilenames = new[] { configFilename, jsonConfigFilename, yamlConfigFilename };
+                        var configFile = Array.Find(configFilenames, File.Exists);
+                        if (configFile != null)
+                        {
+                            arguments += $"-c \"{configFile}\" ";
+                        }
                     }
                 }