ASP.NET MVC 1.0 的数据模型验证

ASP.NET MVC 1.0 的数据模型验证
很多同学喜欢将数据的验证放在控制层(Controller)里，这是非常不对的，违背MVC的初衷，对于模型数据的验证，当然是放在模型层里才恰当。也不需要专程写一个方法在SubmitChanges之前主动去调用，实际上SubmitChanges的时候会调用OnValidate方法，该方法失败后会抛出一个Application的异常。在Controller层里捕捉这个异常再做相应的处理就行了。如此一来更省事，分工更明确，代码更优雅。

以下是一段示例代码，来自ASP.NET MVC Step by Step的例子NerdDinner(删减部分字段)。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;
using System.Web.Mvc;
using NerdDinner.Helpers;

namespace NerdDinner.Models {

    [Bind(Include="Title")]
    public partial class Dinner {

        public bool IsValid {
            get { return (GetRuleViolations().Count() == 0); }
        }

        public IEnumerable<ruleViolation> GetRuleViolations() {

            if (String.IsNullOrEmpty(Title))
                yield return new RuleViolation("Title is required", "Title");

            yield break;
        }

        partial void OnValidate(ChangeAction action) {
            if (!IsValid)
                throw new ApplicationException("Rule violations prevent saving");
        }
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Data.Linq;

using System.Web.Mvc;

using NerdDinner.Helpers;

namespace NerdDinner.Models {

[Bind(Include="Title")]

public partial class Dinner {

public bool IsValid {

get { return (GetRuleViolations().Count() == 0); }

}

public IEnumerable<ruleViolation> GetRuleViolations() {

if (String.IsNullOrEmpty(Title))

yield return new RuleViolation("Title is required", "Title");

yield break;

}

partial void OnValidate(ChangeAction action) {

if (!IsValid)

throw new ApplicationException("Rule violations prevent saving");

}

未完待续

To Be Continued

ASP.NET MVC 1.0 的数据模型验证