第一次失敗時停止流暢驗證

Question

我正在爲我的請求對象定義驗證。 我希望驗證程序在第一次失敗時停止，而不僅僅是同一個鏈上的那個。 在下面的示例中，如果我的TechnicalHeader對象爲空，當驗證達到TechnicalHeader.MCUserid的規則時，會收到NullReference異常。

在貧困的話，我想在下面的代碼的最後三個規則做了有條件的驗證，根據第一條規則

using System; 
using ServiceStack.FluentValidation; 
using MyProj.Services.Models; 

namespace MyProj.Services.BaseService.Validators 
{ 
    public class BaseValidator<T> : AbstractValidator<T> 
     where T : RequestBase 
    { 
     public BaseValidator() 
     { 
      RuleSet(ServiceStack.ApplyTo.Put | ServiceStack.ApplyTo.Post, 
       () => 
       { 
        this.CascadeMode = CascadeMode.StopOnFirstFailure; 
        RuleFor(x => x.TechnicalHeader).Cascade(CascadeMode.StopOnFirstFailure).NotNull().WithMessage("Header cannot be null"); 
        RuleFor(x => x.TechnicalHeader).NotEmpty().WithMessage("Header cannot be null"); 
        RuleFor(x => x.TechnicalHeader.Userid).NotEmpty().WithMessage("Userid cannot be null or an empty string"); 
        RuleFor(x => x.TechnicalHeader.CabCode).GreaterThan(0).WithMessage("CabCode cannot be or less than 0"); 
        RuleFor(x => x.TechnicalHeader.Ndg).NotEmpty().WithMessage("Ndg cannot be null or an empty string"); 
       } 
      ); 
     } 
    } 
} 

Answer 1

的結果運行規則之前就檢查null該取決於他們，使用When條件。

this.CascadeMode = CascadeMode.StopOnFirstFailure; 
RuleFor(x => x.TechnicalHeader).NotNull().WithMessage("Header cannot be null"); 

// Ensure TechnicalHeader is provided 
When(x => x.TechnicalHeader != null,() => { 
    RuleFor(x => x.TechnicalHeader.Userid).NotEmpty().WithMessage("Userid cannot be null or an empty string"); 
    RuleFor(x => x.TechnicalHeader.CabCode).GreaterThan(0).WithMessage("CabCode cannot be or less than 0"); 
    RuleFor(x => x.TechnicalHeader.Ndg).NotEmpty().WithMessage("Ndg cannot be null or an empty string"); 
});