style: 命令不可变化与规范补充

src/Api/TakeoutSaaS.AdminApi/Controllers/ProductsController.cs

@@ -16,20 +16,15 @@ namespace TakeoutSaaS.AdminApi.Controllers;
 /// <summary>
 /// 商品管理。
 /// </summary>
+/// <remarks>
+/// 初始化控制器。
+/// </remarks>
 [ApiVersion("1.0")]
 [Authorize]
 [Route("api/admin/v{version:apiVersion}/products")]
-public sealed class ProductsController : BaseApiController
+public sealed class ProductsController(IMediator mediator) : BaseApiController
 {
-    private readonly IMediator _mediator;
 
-    /// <summary>
-    /// 初始化控制器。
-    /// </summary>
-    public ProductsController(IMediator mediator)
-    {
-        _mediator = mediator;
-    }
 
     /// <summary>
     /// 创建商品。
@@ -39,7 +34,7 @@ public sealed class ProductsController : BaseApiController
     [ProducesResponseType(typeof(ApiResponse<ProductDto>), StatusCodes.Status200OK)]
     public async Task<ApiResponse<ProductDto>> Create([FromBody] CreateProductCommand command, CancellationToken cancellationToken)
     {
-        var result = await _mediator.Send(command, cancellationToken);
+        var result = await mediator.Send(command, cancellationToken);
         return ApiResponse<ProductDto>.Ok(result);
     }
 
@@ -59,7 +54,7 @@ public sealed class ProductsController : BaseApiController
         [FromQuery] bool sortDesc = true,
         CancellationToken cancellationToken = default)
     {
-        var result = await _mediator.Send(new SearchProductsQuery
+        var result = await mediator.Send(new SearchProductsQuery
         {
             StoreId = storeId,
             CategoryId = categoryId,
@@ -82,7 +77,7 @@ public sealed class ProductsController : BaseApiController
     [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
     public async Task<ApiResponse<ProductDto>> Detail(long productId, CancellationToken cancellationToken)
     {
-        var result = await _mediator.Send(new GetProductByIdQuery { ProductId = productId }, cancellationToken);
+        var result = await mediator.Send(new GetProductByIdQuery { ProductId = productId }, cancellationToken);
         return result == null
             ? ApiResponse<ProductDto>.Error(ErrorCodes.NotFound, "商品不存在")
             : ApiResponse<ProductDto>.Ok(result);
@@ -97,8 +92,11 @@ public sealed class ProductsController : BaseApiController
     [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
     public async Task<ApiResponse<ProductDto>> Update(long productId, [FromBody] UpdateProductCommand command, CancellationToken cancellationToken)
     {
-        command.ProductId = command.ProductId == 0 ? productId : command.ProductId;
-        var result = await _mediator.Send(command, cancellationToken);
+        if (command.ProductId == 0)
+        {
+            command = command with { ProductId = productId };
+        }
+        var result = await mediator.Send(command, cancellationToken);
         return result == null
             ? ApiResponse<ProductDto>.Error(ErrorCodes.NotFound, "商品不存在")
             : ApiResponse<ProductDto>.Ok(result);
@@ -113,7 +111,7 @@ public sealed class ProductsController : BaseApiController
     [ProducesResponseType(typeof(ApiResponse<object>), StatusCodes.Status404NotFound)]
     public async Task<ApiResponse<object>> Delete(long productId, CancellationToken cancellationToken)
     {
-        var success = await _mediator.Send(new DeleteProductCommand { ProductId = productId }, cancellationToken);
+        var success = await mediator.Send(new DeleteProductCommand { ProductId = productId }, cancellationToken);
         return success
             ? ApiResponse<object>.Ok(null)
             : ApiResponse<object>.Error(ErrorCodes.NotFound, "商品不存在");