Fix for BaseUrl in C# base class not being used - Correction

Fixed If in template and added test case for when there is a base class

src/NSwag.CodeGeneration.CSharp.Tests/CSharpClientSettingsTests.cs

@@ -89,6 +89,31 @@ public async Task WhenUsingBaseUrl_ButNoProperty_ThenPropertyIsNotUsedAndFieldIs
             Assert.Contains("string _baseUrl", code);
         }
 
+        [Fact]
+        public async Task WhenUsingBaseUrl_ButNoPropertyWithBaseClass_ThenPropertyIsUsedAndFieldIsNotGenerated()
+        {
+            // Arrange
+            var swaggerGenerator = new WebApiOpenApiDocumentGenerator(new WebApiOpenApiDocumentGeneratorSettings
+            {
+                SchemaSettings = new NewtonsoftJsonSchemaGeneratorSettings()
+            });
+
+            var document = await swaggerGenerator.GenerateForControllerAsync<FooController>();
+            var generator = new CSharpClientGenerator(document, new CSharpClientGeneratorSettings
+            {
+                UseBaseUrl = true,
+                GenerateBaseUrlProperty = false,
+                ClientBaseClass = "MyBaseClass"
+            });
+
+            // Act
+            var code = generator.GenerateFile();
+
+            // Assert
+            Assert.Contains("BaseUrl", code);
+            Assert.DoesNotContain("string _baseUrl", code);
+        }
+
         [Fact]
         public async Task When_parameter_name_is_reserved_keyword_then_it_is_appended_with_at()
         {

src/NSwag.CodeGeneration.CSharp/Templates/Client.Class.liquid

@@ -2,11 +2,13 @@
 [System.CodeDom.Compiler.GeneratedCode("NSwag", "{{ ToolchainVersion }}")]
 {{ ClientClassAccessModifier }} partial class {{ Class }} {% if HasBaseType %}: {% endif %}{% if HasBaseClass %}{{ BaseClass }}{% if GenerateClientInterfaces %}, {% endif %}{% endif %}{% if GenerateClientInterfaces %}I{{ Class }}{% endif %}
 {
-{% if UseBaseUrl and HasBaseClass == false and GenerateBaseUrlProperty == true -%}
+{% if UseBaseUrl -%}
+{%     if HasBaseClass == false or GenerateBaseUrlProperty == true -%}
     #pragma warning disable 8618
     private string _baseUrl;
     #pragma warning restore 8618
 
+{%     endif -%}
 {% endif -%}
 {% if InjectHttpClient -%}
     private {{ HttpClientType }} _httpClient;