使用数据注释在c＃中进行数据验证

如何解决使用数据注释在c＃中进行数据验证

我要将客户端的数据迁移到新数据库（sql SERVER），我需要为其验证所有属性。 我尝试添加数据批注，但未按预期工作。

这是我的示例代码：

 public class SellerDetailModel
    {
        [required,RegularExpression("[0-9]{2}[0-9A-Z]{13}")]
        public string GSTNumber; 

        [required,StringLength(100,MinimumLength = 3)]
        public string LegalName;

        [StringLength(100,MinimumLength = 3)]
        public string TradingName;

        [required,MinimumLength = 3)]
        public string Address1;

        [StringLength(100,MinimumLength = 3)]
        public string Address2;

        [required,StringLength(50,MinimumLength = 3)]
        public string Location;

        [required,StringLength(6)]
        public int PinCode;

        [required,StringLength(2,MinimumLength = 1)]
        public string StateCode;

        [StringLength(12,MinimumLength = 6)]
        public string ContactNumber;

        [required,MinimumLength = 6)]
        public string EmailId;
    }

现在，在另一个类（业务逻辑）中，我正在为该类分配值。

//"invoice" is an object having seller related data

SellerDetailModel dataTransferObject = new SellerDetailModel
                    {
                        GSTNumber = invoice.SellerGSTNumber,LegalName = invoice.SellerLegalName,TradingName = invoice.SellerTradingName,Address1 = invoice.SellerAddress1,Address2 = invoice.SellerAddress2,Location = invoice.SellerLocation,PinCode = Convert.ToInt32(invoice.SellerPinCode),StateCode = invoice.SellerStateCode,ContactNumber = invoice.SellerContactNumber,EmailId = invoice.SellerEmailId,};

   

，但即使添加了必需的属性，正则表达式，字符串长度等...也没有被验证， 它仍然接受所有null，空值。 有人可以帮我如何验证这些属性吗？

如果在迁移过程中发生一些错误，我只想创建一个日志数据。

编辑

我已经尝试了以下方法，但仍然无法正常工作...

public string Validate()
        {
            ValidationContext context = new ValidationContext(this);
            List<ValidationResult> results = new List<ValidationResult>();
            bool isValid = Validator.TryValidateObject(this,context,results,true);

            if (!isValid)
            {
                StringBuilder sbrErrors = new StringBuilder();
                foreach (var validationResult in results)
                {
                    sbrErrors.AppendLine(validationResult.ErrorMessage);
                }
                return sbrErrors.ToString();
            }
            else
                return string.Empty;
        }


 var validation = dataTransferObject.Validate() //always gives string.Empty

解决方法

问题在于ValidationContext使用属性而不是字段。

我通过反编译ValidationContext类找到了答案，发现它只会搜索属性。

您需要将代码更改为此，以便将其转换为属性后才能使用。

public class SellerDetailModel
{
    [Required,RegularExpression("[0-9]{2}[0-9A-Z]{13}")]
    public string GSTNumber { get; set; }

    [Required,StringLength(100,MinimumLength = 3)]
    public string LegalName { get; set; }

    [StringLength(100,MinimumLength = 3)] 
    public string TradingName { get; set; }

    [Required,MinimumLength = 3)]
    public string Address1 { get; set; }

    [StringLength(100,MinimumLength = 3)]
    public string Address2 { get; set; }

    [Required,StringLength(50,MinimumLength = 3)]
    public string Location { get; set; }

    [Required,StringLength(6)]
    public string PinCode { get; set; }

    [Required,StringLength(2,MinimumLength = 1)]
    public string StateCode { get; set; }

    [StringLength(12,MinimumLength = 6)]
    public string ContactNumber { get; set; }

    [Required,MinimumLength = 6)]
    public string EmailId { get; set; }

    public string Validate()
    {
        ValidationContext context = new ValidationContext(this);
        List<ValidationResult> results = new List<ValidationResult>();
        bool isValid = Validator.TryValidateObject(this,context,results,true);

        if (!isValid)
        {
            StringBuilder sbrErrors = new StringBuilder();
            foreach (ValidationResult validationResult in results)
            {
                sbrErrors.AppendLine(validationResult.ErrorMessage);
            }
            return sbrErrors.ToString();
        }
        else
            return string.Empty;
    }
}

看起来您也不需要在Invoice上转换为int。PinCode字段或Validation函数会因为查找字符串而被炸毁。

public class Invoice
{
    public string SellerGSTNumber { get; set; }
    public string SellerLegalName { get; set; }
    public string SellerTradingName { get; set; }
    public string SellerAddress1 { get; set; }
    public string SellerAddress2 { get; set; }
    public string SellerLocation { get; set; }
    public string SellerPinCode { get; set; }
    public string SellerStateCode { get; set; }
    public string SellerContactNumber { get; set; }
    public string SellerEmailId { get; set; }
}

public class Mapper
{
    public static SellerDetailModel Map(Invoice invoice)
    {
        SellerDetailModel dataTransferObject = new SellerDetailModel
        {
            GSTNumber = invoice.SellerGSTNumber,LegalName = invoice.SellerLegalName,TradingName = invoice.SellerTradingName,Address1 = invoice.SellerAddress1,Address2 = invoice.SellerAddress2,Location = invoice.SellerLocation,PinCode = invoice.SellerPinCode,StateCode = invoice.SellerStateCode,ContactNumber = invoice.SellerContactNumber,EmailId = invoice.SellerEmailId,};

        return dataTransferObject;
    }
}