asp.net core 簡化模型驗證 modelState.IsValid不用每個寫

第一種：直接在執行action以前驗證模型 實現 IActionFilter

  public class ModelStateFilter : IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext context)
        {
            ModelStateDictionary modelState = context.ModelState;
            if (!modelState.IsValid)
            {
                context.Result = new BadRequestObjectResult(modelState);
            }
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {

        }
    }

第二種 屬性的實現

    /// <summary>
    /// 簡化模型驗證 modelState.IsValid不用每個寫
    /// </summary>
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true)]
    public class ModelValidationAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            ModelStateDictionary modelState = context.ModelState;
            if (!modelState.IsValid)
            {
                context.Result = new BadRequestObjectResult(modelState);
            }
        }
    }