MVC验证独特 [英] MVC validation for unique

问题描述

您好我有一个MVC应用程序，我用来插入更新发票：

Hi I have an MVC app that I used to insert update invoices:

public class Invoice : IEntity, IValidatableObject
    {
        public virtual int InvoiceId { get; set; }

        [Required(ErrorMessage = "Invoice Number is a required field.")]
        [Column(TypeName = "varchar")]
        [StringLength(20)]
        [Display(Name = "Invoice Number:")]
        public virtual string InvoiceNumber { get; set; }

        [Required(ErrorMessage = "Organisation is a required field.")]
        [Display(Name = "Organisation:")]
        public int OrganisationId { get; set; }

              ...
}

问题是我有一个要求组织和发票号码的组合必须是唯一的。

The problem is I have a requirement "The combination of organisation and invoice number must be unique.

因此​​，这已经通过在数据库中的DBA成立。所以，如果我试图这样做将返回一个异常。

So this has been set up by the DBA in the database. So if I try to do this it will return an exception.

有没有一种方法，而不是显示例外，抓住它，并添加自定义错误消息的验证摘要？

Is there a way instead of displaying the exception to catch it and add a custom error message to the validation summary?

推荐答案

您可以捕获该异常和错误添加到模型状态，这样你的客户code处理所有的错误一样。是这样的：

You could catch the exception and add the error to the model state so that your client code handles all errors the same way. Something like:

ModelState.AddModelError("InvoiceNumber", "The combination of organisation and invoice number must be unique.");

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