.NET6开发TodoList应用之实现ActionFilter

using System.Text.JSON;
using Microsoft.Aspnetcore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;

namespace TodoList.Api.Filters;

public class LogFilterAttribute : IActionFilter
{
    private readonly ILogger<LogFilterAttribute> _logger;

    public LogFilterAttribute(ILogger<LogFilterAttribute> logger) => _logger = logger;

    public void OnActionExecuting(ActionExecutinGContext context)
    {
        var action = context.RouteData.Values["action"];
        var controller = context.RouteData.Values["controller"];
        // 获取名称包含Command的参数值
        var param = context.ActionArguments.SingleOrDefault(x => x.Value.ToString().Contains("Command")).Value;

        _logger.LogInfORMation($"Controller:{controller}, action: {action}, Incoming request: {jsonSerializer.Serialize(param)}");
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        var action = context.RouteData.Values["action"];
        var controller = context.RouteData.Values["controller"];
        // 需要先将Result转换为ObjectResult类型才能拿到Value值
        var result = (ObjectResult)context.Result!;

        _logger.LogInformation($"Controller:{controller}, action: {action}, Executing response: {JsonSerializer.Serialize(result.Value)}");
    }
}

builder.Services.AddScoped<LogFilterAttribute>();

[HttpPost]
[ServiceFilter(typeof(LogFilterAttribute))]
public async Task<ApiResponse<Domain.Entities.TodoList>> Create([FromBody] CreateTodoListCommand command)
{
    return ApiResponse<Domain.Entities.TodoList>.Success(await _mediator.Send(command));
}