.net6的webapi项目统一封装返回值

/// <summary>
/// 封装工厂后台的返回数据
/// </summary>
public class FactoryResultFilterAttribute : ResultFilterAttribute
{/// <summary>/// 如果只是返回Task的接口，会自动封装成CommonResponse/// </summary>/// <param name="context"></param>/// <param name="next"></param>/// <returns></returns>public override async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next){if (!context.ActionDescriptor.EndpointMetadata.Any(x => x.GetType().Equals(typeof(NoResultFilterAttribute)))){if (context.Result.GetType() == typeof(EmptyResult)){var res = new CommonResponse();context.Result = new JsonResult(res){ContentType = "application/json",StatusCode = 200,};}else if ((context.HttpContext.Request.Method.Equals("GET", StringComparison.OrdinalIgnoreCase) || context.HttpContext.Request.Method.Equals("POST", StringComparison.OrdinalIgnoreCase)) && context.Result is ObjectResult){var result = (ObjectResult)context.Result;var res = new CommonResponse<Object>{Data = result.Value,};context.Result = new JsonResult(res){ContentType = "application/json",StatusCode = 200,};}}await next.Invoke();}}

1. 统一包装返回参数，使用过滤器ResultFilterAttribute来实现，OnResultExecutionAsync中可以处理所有Get和Post类型接口返回的数据，用CommonResponse类包装一下。

CommonResponse类主要用来返回Code（200表示成功）和Message（访问失败的原因）

2. 这里配合ExceptionFilterAttribute一起用，用来捕捉错误BusinessException，这样业务代码出现错误后，直接throw new BusinessException("金额不能为0")，就会被过滤器自动捕捉并封装成CommonResponse返回给前端，方便前端统一处理。

/// <summary>
/// 业务类型错误
/// </summary>
public class BusinessException : Exception
{public BusinessException() : base("数据不存在"){}public BusinessException(string message) : base(message){}
}

/// <summary>
/// 通用的异常处理
/// </summary>
public class FactoryExceptionFilterAttribute : ExceptionFilterAttribute
{private readonly ILogger<FactoryExceptionFilterAttribute> _logger;/// <summary>/// /// </summary>/// <param name="logger"></param>public FactoryExceptionFilterAttribute(ILogger<FactoryExceptionFilterAttribute> logger){_logger = logger;}/// <summary>/// 通用api接口异常处理/// </summary>/// <param name="context"></param>/// <returns></returns>public override Task OnExceptionAsync(ExceptionContext context){if (!context.ExceptionHandled){Exception exception = context.Exception;if (exception is BusinessException){context.Result = new JsonResult(new CommonResponse(exception.Message));}else if (exception is ValidationException){ValidationException? e = exception as ValidationException;context.Result = new JsonResult(new CommonResponse(e?.Errors.FirstOrDefault()?.ErrorMessage ?? ""));}else{var res = new CommonResponse{Code = ResCode.ServerError,Message = "请求错误"};exception.Log(context.HttpContext);_logger.LogError(exception.Message);context.Result = new JsonResult(res);}}context.ExceptionHandled = true;return Task.CompletedTask;}
}