【转载】C#后台声明式验证，远离if验证

ViewModel

 public class ViewModel
    {

        [Required(ErrorMessage="标题不能为空")]
        public string Title { get; set; }



        public string Name { get; set; }



    }

后台验证代码

public async Task<ActionResult> Save(ViewModel vm)
        {
            var validationContext = new ValidationContext(vm);
            var results = new List<ValidationResult>();
            var isValid = Validator.TryValidateObject(vm, validationContext, results, true); 
            if (!isValid)
            {
                return Json(new { Result = false, Msg = results.Select(x => x.ErrorMessage).FirstOrDefault() });
            }
            return Json(new { Result = true, Msg = "成功！" });
        }

　　

前台调用：

$.ajax({
            type: "post",
            url: "/home/save",
            data: "title=&name=11222332",
            dataType:"json", 
            success: function(data) {
                 alert(data.Msg);
            } 
        });

　　

原文地址：http://www.cnblogs.com/dudu/p/annotation-based-validation.html#3100481