RequiredIf Conditional Validation for two variables in MVC4

问题

I have a model class that is following

 public bool Saturday{ get; set; }

 public bool Sunday{ get; set; }

 public string Holiday{ get; set; }

In which I want to use the RequiredIf condition for the Holiday field using the both Saturday and Sunday fields. Can I use like following

   [RequiredIf("Sunday,Saturday",false)]
   public string Holiday{ get; set; }

So I don't know how to use the RequiredIf condition in my model class, So please someone help me

回答1:

Maybe try this in your model:

[Required]
public bool Saturday{ get; set; }

[Required]
public bool Sunday{ get; set; }

[NotMapped]
public bool SatSun
{
    get
    {
        return (!this.Saturday && !this.Sunday);
    }
}

[RequiredIf("SatSun",true)]
public string Holiday{ get; set; }

回答2:

My Project has RequiredIf in it.

[Required]
public int SalesID { get; set; }

[RequiredIf("SalesID==1", ErrorMessage = "License is required.")]
public string License{ get; set; }

It shows error message 'License is required.' when License is left blank only if SalesID is 1. License cannot be blank if SalesID is 1.

For your code it should be something like

[RequiredIf("Sunday,Saturday",AllowEmptyStrings=false)]
public string Holiday{ get; set; }

It means if Sunday and Saturday are true you can allow Holiday property to be an Empty String.

来源：https://stackoverflow.com/questions/28336992/requiredif-conditional-validation-for-two-variables-in-mvc4