IsValid(object value) has not been implemented by this class. The preferred entry point is GetValid

IsValid(object value) has not been implemented by this class. The preferred entry point is GetValidationResult() and classes should override IsValid(object value, ValidationContext context).

模型验证时，创建自定义验证特性，报了这个错。

注：下面这个截图，是自定义的模型认证方式，在ASP.NET Core中API或MVC中看不到这个## 错误原因

方法：protected virtual ValidationResult IsValid(object value, ValidationContext validationContext)

1. 自定义验证特性方法没有覆写

	public class ValidateExtensionAttribute : ValidationAttribute
    {
    }

2. 自定义验证特性方法覆写错误

using System.ComponentModel.DataAnnotations;

namespace Surging.Core.CPlatform.DataAnnotationsExtension
{
    public class ValidateExtensionAttribute : ValidationAttribute
    {
    	//这样的写法是错误的 错误的 错误的
        //protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        //{
              //xxxx 业务代码
        //    return base.IsValid(value, validationContext);
        //}

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
        	//xxxx 业务代码
            return ValidationResult.Success;
        }
    }
}