From f81be9610732e035fd37e880f759f7d6125cc05d Mon Sep 17 00:00:00 2001
From: Mark Cowlishaw <markcowl@microsoft.com>
Date: Tue, 19 Nov 2024 19:35:15 -0800
Subject: [PATCH] Fix #5024 handling of literal types in interface ops

---
 packages/http-server-csharp/src/service.ts    |  6 ++-
 .../test/generation.test.ts                   | 51 +++++++++++++++++++
 2 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/packages/http-server-csharp/src/service.ts b/packages/http-server-csharp/src/service.ts
index 5a8ede4e94..7f2d9fefa3 100644
--- a/packages/http-server-csharp/src/service.ts
+++ b/packages/http-server-csharp/src/service.ts
@@ -685,13 +685,15 @@ export async function $onEmit(context: EmitContext<CSharpServiceEmitterOptions>)
       }
       let i = 1;
       for (const requiredParam of requiredParams) {
+        const [paramType, _] = this.#findPropertyType(requiredParam);
         signature.push(
-          code`${this.emitter.emitTypeReference(requiredParam.type)} ${ensureCSharpIdentifier(this.emitter.getProgram(), requiredParam, requiredParam.name, NameCasingType.Parameter)}${i++ < totalParams ? ", " : ""}`,
+          code`${paramType} ${ensureCSharpIdentifier(this.emitter.getProgram(), requiredParam, requiredParam.name, NameCasingType.Parameter)}${i++ < totalParams ? ", " : ""}`,
         );
       }
       for (const optionalParam of optionalParams) {
+        const [paramType, _] = this.#findPropertyType(optionalParam);
         signature.push(
-          code`${this.emitter.emitTypeReference(optionalParam.type)}? ${ensureCSharpIdentifier(this.emitter.getProgram(), optionalParam, optionalParam.name, NameCasingType.Parameter)}${i++ < totalParams ? ", " : ""}`,
+          code`${paramType}? ${ensureCSharpIdentifier(this.emitter.getProgram(), optionalParam, optionalParam.name, NameCasingType.Parameter)}${i++ < totalParams ? ", " : ""}`,
         );
       }
       return signature.reduce();
diff --git a/packages/http-server-csharp/test/generation.test.ts b/packages/http-server-csharp/test/generation.test.ts
index b2496f8e5b..fae01567d1 100644
--- a/packages/http-server-csharp/test/generation.test.ts
+++ b/packages/http-server-csharp/test/generation.test.ts
@@ -779,3 +779,54 @@ it("generates appropriate types for literals", async () => {
     ],
   );
 });
+
+it("generates appropriate types for literals in operation parameters", async () => {
+  await compileAndValidateMultiple(
+    runner,
+    `
+      /** A simple test model*/
+      model Foo {
+        /** Numeric literal */
+        @header intProp: 8;
+        /** Floating point literal */
+        @header floatProp: 3.14;
+        /** string literal */
+        @header stringProp: "A string of characters";
+        /** string template prop */
+        @header stringTempProp: "\${Foo.stringProp} and then some";
+        /** boolean */
+        @header trueProp: true;
+        /** boolean */
+        @header falseProp: false;
+      }
+
+      @route("/foo") op foo(...Foo): void;
+      `,
+    [
+      [
+        "Foo.cs",
+        [
+          "public partial class Foo",
+          "public int IntProp { get; } = 8",
+          "public double FloatProp { get; } = 3.14",
+          `public string StringProp { get; } = "A string of characters"`,
+          `public string StringTempProp { get; } = "A string of characters and then some"`,
+          "public bool TrueProp { get; } = true",
+          "public bool FalseProp { get; } = false",
+        ],
+      ],
+      [
+        "ContosoOperationsControllerBase.cs",
+        [
+          `public virtual async Task<IActionResult> Foo([FromHeader(Name="int-prop")] int intProp = 8, [FromHeader(Name="float-prop")] double floatProp = 3.14, [FromHeader(Name="string-prop")] string stringProp = "A string of characters", [FromHeader(Name="string-temp-prop")] string stringTempProp = "A string of characters and then some", [FromHeader(Name="true-prop")] bool trueProp = true, [FromHeader(Name="false-prop")] bool falseProp = false)`,
+        ],
+      ],
+      [
+        "IContosoOperations.cs",
+        [
+          `Task FooAsync( int intProp, double floatProp, string stringProp, string stringTempProp, bool trueProp, bool falseProp);`,
+        ],
+      ],
+    ],
+  );
+});