实验14——自定义服务器端验证

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实验14——自定义服务器端验证

1. 创建自定义验证

新建类，并命名为FirstNameValidation，代码如下：

   1:  public class FirstNameValidation:ValidationAttribute

   2:  {

   3:      protected override ValidationResult IsValid(object value, ValidationContext validationContext)

   4:      {

   5:          if (value == null) // Checking for Empty Value

   6:          {

   7:              return new ValidationResult("Please Provide First Name");

   8:          }

   9:          else

  10:          {

  11:              if (value.ToString().Contains("@"))

  12:              {

  13:                  return new ValidationResult("First Name should contain @");

  14:              }

  15:          }

  16:          return ValidationResult.Success;

  17:      }

  18:  }

2. 附加到First Name

打开Employee类，删除FirstName的默认的Required属性，添加FirstNameValidation，代码如下：

   1:  [FirstNameValidation]

   2:  public string FirstName { get; set; }

3. 运行

导航到Employee/AddNew

测试1：

测试2：

结论

本节主要讲解了数据访问层相关的知识，如数据验证，数据更新，数据处理，form表单的使用等。

public class FirstNameValidation:ValidationAttribute
{
      protected override ValidationResult IsValid(object value, ValidationContext validationContext)
      {
          if (value == null) // Checking for Empty Value
          {
              return new ValidationResult("Please Provide First Name");
          }
          else
          {
              if (value.ToString().Contains("@"))
              {
                  return new ValidationResult("First Name should not contain @");
              }
          }
          return ValidationResult.Success;
      }
}

    public class Employee
    {
       [Key]
        public int EmployeeId { get; set; }

        [FirstNameValidation]
        public string FirstName { get; set; }
        [StringLength(5,ErrorMessage="Last Name length should not be greater than 5")]
        public string LastName { get; set; }
        [Required(ErrorMessage = "the Salary field is required!")]
        public int Salary { get; set; }
    }

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