数字问题的FluentValidation

Question

我在ASP.NET MVC 3应用程序中使用FluentValidation.

我的视图模型中有一个MaxNumberTeamMembers属性:

/// <summary>
/// Gets or sets the maximum number of team members.
/// </summary>
public int MaxNumberTeamMembers { get; set; }

我想知道以下规则集是否可行:

• 在前端视图中,如果文本框为空,那么我想要显示"需要MaxNumberTeamMembers"消息
• 如果输入的数字小于1,那么我想要一条消息显示"MaxNumberTeamMembers应该大于或等于1".

上面的规则集会是什么样的？

我有以下内容,但如果我输入0,它在GreaterThan部分不起作用:

RuleFor(x => x.MaxNumberTeamMembers)
     .NotEmpty()
     .WithMessage("Max. number of team members is required")
     .GreaterThan(0)
     .WithMessage("Max. number of team members must be greater than 0");

更新2011-02-14:

RuleFor(x => x.MinNumberCharactersCitation)
   .NotNull()
   .WithMessage("Min. number of characters for citation is required")
   .GreaterThanOrEqualTo(1)
   .WithMessage("Min. number of characters for citation must be greater than or equal to 1")
   .LessThanOrEqualTo(x => x.MaxNumberCharactersCitation)
   .WithMessage("Min. number of characters must be less than or equal to max. number of characters");

Answer 1

如果要处理空的情况,则需要在模型上使用可为空的整数,否则它是默认的模型绑定程序,它会在尝试将空字符串解析为不可为空的整数时自动添加验证错误:

public int? MaxNumberTeamMembers { get; set; }

然后您可以在此属性上具有以下验证规则:

RuleFor(x => x.MaxNumberTeamMembers)
    .NotEmpty()
    .WithMessage("Max. number of team members is required")
    .Must(x => x.Value > 0)
    .When(x => x.MaxNumberTeamMembers != null)
    .WithMessage("Max. number of team members must be greater than 0");

更新:

以下适用于最新版本的FluentValidation:

RuleFor(x => x.MaxNumberTeamMembers)
    .NotNull()
    .WithMessage("Max. number of team members is required")
    .GreaterThan(0)
    .WithMessage("Max. number of team members must be greater than 0");