1、关闭默认模型验证过滤器

[ApiController] 默认自带有400模型验证,且优先级比较高,如果需要自定义模型验证,则需要先关闭默认的模型验证
在StartUp.cs 中的MVC服务配置修改

   services.AddControllers(options =>
                {
                    options.Filters.Add(new AuthorizeFilter()); //授权过滤器
                    options.Filters.Add(new ModelActionFilter()); //注册全全局模型验证过滤器
                })
                .ConfigureApiBehaviorOptions(options =>
                {
                    options.SuppressModelStateInvalidFilter = true;  //抑制系统自带模型验证

                })
                .AddControllersAsServices();

2、添加自定义模型验证

 public class ErrorResult
    {
        /// <summary>
        /// 参数领域
        /// </summary>
        public string Field { get; set; }

        /// <summary>
        /// 错误信息
        /// </summary>
        public string Message { get; set; }
    }

3、添加过滤器

过滤器继承自:ActionFilterAttribute, IActionFilter

 public class ModelActionFilter:ActionFilterAttribute,IActionFilter
    {
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            if (!context.ModelState.IsValid)
            {
                var errorResults=new List<ErrorResult>();
                foreach (var item in context.ModelState)
                {
                    var result=new ErrorResult()
                    {
                        Field = item.Key,
                    };
                    foreach (var error in item.Value.Errors)
                    {
                        if (!string.IsNullOrEmpty(result.Message))
                        {
                            result.Message += "|";
                        }

                        result.Message += error.ErrorMessage;
                    }
                    errorResults.Add(result);
                }
                context.Result=new BadRequestObjectResult(new
                {
                    Code=StatusCodes.Status400BadRequest,
                    Errors=errorResults
                });
            }
        }
    }
12-18 07:09