Fix missing Microsoft.Extensions.Configuration using in generated ClientSettings when BindCore is customized

packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/src/Providers/ClientSettingsProvider.cs

@@ -70,7 +70,7 @@ internal ClientSettingsProvider(InputClient inputClient, ClientProvider clientPr
         internal IReadOnlyList<ParameterProvider> OtherRequiredParams { get; }
 
         protected override FormattableString BuildDescription()
-            => $"Represents the settings used to configure a <see cref=\"{_clientProvider.Name}\"/> that can be loaded from an <see cref=\"IConfigurationSection\"/>.";
+            => $"Represents the settings used to configure a {_clientProvider.Type:C} that can be loaded from an {IConfigurationSectionType:C}.";
 
         protected override string BuildRelativeFilePath() => Path.Combine("src", "Generated", $"{Name}.cs");
 

packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/ClientSettingsProviderTests.cs

@@ -1140,5 +1140,42 @@ await MockHelpers.LoadMockGeneratorAsync(
             Assert.IsTrue(bodyString.Contains("TenantId"),
                 "BindCore should bind the non-credential parameter 'TenantId'");
         }
+
+        [Test]
+        public async Task TestGeneratedSettings_WithCustomizedBindCore()
+        {
+            await MockHelpers.LoadMockGeneratorAsync(
+                compilation: async () => await Helpers.GetCompilationFromDirectoryAsync(),
+                configuration: "{\"disable-xml-docs\": false, \"package-name\": \"Sample.Namespace\"}");
+
+            var inputParameters = new[]
+            {
+                InputFactory.EndpointParameter(
+                    "endpoint",
+                    InputPrimitiveType.Url,
+                    scope: InputParameterScope.Client,
+                    isEndpoint: true)
+            };
+            var client = InputFactory.Client("TestClient", clientNamespace: "SampleNamespace", parameters: inputParameters);
+            var clientProvider = ScmCodeModelGenerator.Instance.TypeFactory.CreateClient(client);
+            Assert.IsNotNull(clientProvider);
+
+            var settingsProvider = clientProvider!.ClientSettings;
+            Assert.IsNotNull(settingsProvider);
+
+            // BindCore is overridden in custom code, so it should not be generated.
+            var bindCoreMethod = settingsProvider!.Methods.FirstOrDefault(m => m.Signature.Name == "BindCore");
+            Assert.IsNull(bindCoreMethod, "BindCore should not be generated when it is overridden in custom code");
+
+            var writer = new TypeProviderWriter(settingsProvider);
+            var file = writer.Write();
+
+            // Validate the full generated output. Even though BindCore (the only other
+            // reference to IConfigurationSection) is removed via custom code, the type
+            // description still references IConfigurationSection, so the
+            // Microsoft.Extensions.Configuration using must still be emitted.
+            Assert.AreEqual(Helpers.GetExpectedFromFile(), file.Content);
+            StringAssert.Contains("using Microsoft.Extensions.Configuration;", file.Content);
+        }
     }
 }

packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/TestData/ClientSettingsProviderTests/TestGeneratedSettings_WithCustomizedBindCore.cs

@@ -0,0 +1,22 @@
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.ClientModel.Primitives;
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.Extensions.Configuration;
+
+namespace SampleNamespace
+{
+    /// <summary> Represents the settings used to configure a <see cref="global::SampleNamespace.TestClient"/> that can be loaded from an <see cref="global::Microsoft.Extensions.Configuration.IConfigurationSection"/>. </summary>
+    [global::System.Diagnostics.CodeAnalysis.ExperimentalAttribute("SCME0002")]
+    public partial class TestClientSettings : global::System.ClientModel.Primitives.ClientSettings
+    {
+        /// <summary> Gets or sets the Endpoint. </summary>
+        public global::System.Uri Endpoint { get; set; }
+
+        /// <summary> Gets or sets the Options. </summary>
+        public global::SampleNamespace.TestClientOptions Options { get; set; }
+    }
+}

packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.ClientModel/test/Providers/TestData/ClientSettingsProviderTests/TestGeneratedSettings_WithCustomizedBindCore/TestClientSettings.cs

@@ -0,0 +1,11 @@
+#nullable disable
+
+using Microsoft.Extensions.Configuration;
+
+namespace SampleNamespace
+{
+    public partial class TestClientSettings
+    {
+        protected override void BindCore(IConfigurationSection section) { }
+    }
+}