ASP.NET MVC2 数据模型验证类库：MVC Foolproof Validation

MVC Foolproof Validation是一个数据模型类库扩展。

操作符验证

public class SignUpViewModel
{
    [Required]
    public string Password { get; set; }

    [EqualTo("Password", ErrorMessage="Passwords do not match.")]
    public string RetypePassword { get; set; }
}
public class EventViewModel
{
    [Required]
    public string Name { get; set; }

    [Required]
    public DateTime Start { get; set; }

    [Required]
    [GreaterThan("Start")]
    public DateTime End { get; set; }
}

有效的操作符验证器

[Is]
[EqualTo]
[NotEqualTo]
[GreaterThan]
[LessThan]
[GreaterThanOrEqualTo]
[LessThanOrEqualTo]

非空验证

private class Person
{
    [Required]
    public string FirstName { get; set; }

    [Required]
    public string LastName { get; set; }

    public bool Married { get; set; }

    [RequiredIfTrue("Married")]
    public string MaidenName { get; set; }
}

条件非空验证

[RequiredIf]
[RequiredIfNot]
[RequiredIfTrue]
[RequiredIfFalse]
[RequiredIfEmpty]
[RequiredIfNotEmpty]
[RequiredIfRegExMatch]
[RequiredIfNotRegExMatch]

启用客户端验证

要启用客户端验证，必须包含标准的客户端验证文件和MvcFoolproofValidation.js文件：

<script src="../../Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>
<script src="../../Scripts/MvcFoolproofValidation.js" type="text/javascript"></script>

jQuery验证

如果使用jQuery验证，则必须包含标准的客户端验证文件和MvcFoolproofJQueryValidation.js文件：

<script src="../../Scripts/jquery.js" type="text/javascript"></script>
<script src="../../Scripts/jquery-validate.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcJQueryValidation.js" type="text/javascript"></script>
<script src="../../Scripts/MvcFoolproofJQueryValidation.js" type="text/javascript"></script>

复杂自定义验证

自定义验证属性：

public class RoleValidInDepartmentAttribute : ModelAwareValidationAttribute
{
    //this is needed to register this attribute with foolproof's validator adapter
    static RoleValidInDepartmentAttribute() { Register.Attribute(typeof(RoleValidInDepartmentAttribute)); }

    public override bool IsValid(object value, object container)
    {
        if (value != null && value.ToString() == "Software Developers")
        {
            //if the role was software developers, we need to make sure the user is in the IT department
            var model = (CreateUserViewModel)container;
            return model.Department == "IT Department";
        }

        //the user wasn't in a constrained role, so just return true
        return true;
    }
}

应用到模型之中：

public class CreateUserViewModel
{
    [Required]
    public string Username { get; set; }

    [Required]
    public string Department { get; set; }

    [Required]
    [RoleValidInDepartment(ErrorMessage="This role isn't valid for the selected department.")]
    public string Role { get; set; }
}

Foolproof Provides Contingent Data Annotation Validation for ASP.NET MVC 2

Build Model-Aware Custom Validation Attributes in ASP.NET MVC 2

Client Side Model-Aware Validation

官方地址：http://foolproof.codeplex.com