如何將條件必需屬性放入類屬性中以使用WEB API？

Question

我只想把條件要求的屬性這與WEB API工作

例

public sealed class EmployeeModel 
{ 
     [Required] 
     public int CategoryId{ get; set; } 
     public string Email{ get; set; } // If CategoryId == 1 then it is required 
} 

我通過（ActionFilterAttribute）使用型號狀態驗證

Answer 1

您可以實施自己的ValidationAttribute。也許是這樣的：

public class RequireWhenCategoryAttribute : ValidationAttribute 
{ 
    protected override ValidationResult IsValid(object value, ValidationContext validationContext) 
    { 
     var employee = (EmployeeModel) validationContext.ObjectInstance; 
     if (employee.CategoryId == 1) 
     { 
      return ValidationResult.Success; 
     } 
     var emailStr = value as String; 
     return string.IsNullOrEmpty(emailStr) ? new ValidationResult("Value is required.") : ValidationResult.Success; 
    } 
} 

public sealed class EmployeeModel 
{ 
    [Required] 
    public int CategoryId { get; set; } 
    [RequireWhenCategory] 
    public string Email { get; set; } // If CategoryId == 1 then it is required 
} 

這只是一個例子。它可能有鑄造問題，我不確定這是解決此問題的最佳方法。