如何在自定义ValidationAttributes中获取/注入服务

using System;
using System.ComponentModel.DataAnnotations;

public class CustomValidationAttribute : ValidationAttribute
{
    private readonly ICustomService _customService;

    public CustomValidationAttribute(ICustomService customService)
    {
        _customService = customService;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        // 使用注入的服务进行验证逻辑
        bool isValid = _customService.Validate(value);

        if (isValid)
        {
            return ValidationResult.Success;
        }
        else
        {
            return new ValidationResult(ErrorMessage);
        }
    }
}

// 自定义的服务接口
public interface ICustomService
{
    bool Validate(object value);
}

// 自定义的服务实现
public class CustomService : ICustomService
{
    public bool Validate(object value)
    {
        // 实现自定义的验证逻辑
        // 可以使用其他服务、数据库、外部API等资源进行验证
        return true;
    }
}

public class MyModel
{
    [CustomValidation] // 使用自定义的ValidationAttribute
    public string MyProperty { get; set; }
}