C# 特性

using System.ComponentModel.DataAnnotations;

//特性是个类，继承自Attribute
//系统自带特性
//自定义特性

class AccountViewModel
{

[Required]
[Display(Name ="邮箱")]
[Define("这是第一个特性的创建！")]
public string Email { get; set; }
}

/// <summary>
/// 创建特性
/// </summary>
public class DefineAttribute:Attribute
{
public DefineAttribute(string showInfo)
{
Console.WriteLine(showInfo);
}
}