How to Implement Conditional Validation Using IValidatableObject?

In the field of data verification, IvalidatableObject interface plays a vital role, which allows object -level verification and can compare different attributes of objects. When you need to verify a single attribute and at the same time, you can selectively ignore certain verification failure in specific scenarios, avalidatableObject provides a flexible solution.

This article will introduce how to use IvalidatableObject to implement conditional verification.

attribute. If this attribute is disabled, the effective results are returned and the status of Validate() and Enabled is ignored. However, if this attribute is enabled, you will check whether Prop1 and Prop2 meet the scope requirements. Prop1 Prop2 The steps of effective implementation of conditional verification are as follows:

Define a class that implements IvalidatableObject interfaces.
1. Add attribute verification characteristics: Use verification characteristics, such as
and
2. to define the verification rules of a single attribute. Rewilling Validate () Method: [Required] In the [Range] method, use
to verify the single attribute.
3. Processing conditional verification: Inside the Validate() method, check the conditions (such as Validator.TryValidateProperty() attributes) to determine whether the verification failure of certain attributes needs to be ignored.
4. The following is an example: Validate() Enable
Verification object:

Performing object level verification.

public class ValidateMe : IValidatableObject
{
    [Required]
    public bool Enable { get; set; }

    [Range(1, 5)]
    public int Prop1 { get; set; }

    [Range(1, 5)]
    public int Prop2 { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var results = new List<ValidationResult>();
        if (this.Enable)
        {
            Validator.TryValidateProperty(this.Prop1,
                new ValidationContext(this, null, null) { MemberName = "Prop1" },
                results);
            Validator.TryValidateProperty(this.Prop2,
                new ValidationContext(this, null, null) { MemberName = "Prop2" },
                results);

            // 附加条件验证规则
            if (this.Prop1 > this.Prop2)
            {
                results.Add(new ValidationResult("Prop1 必须大于 Prop2"));
            }
        }
        return results;
    }
}

By following these steps, you can use the conditional verification function of iValidatableObject to create a strong and flexible data verification mechanism.

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