【Unity】自定义[Attribute]特性标记

继承Attribute，自定义特性类

using System;
public class HttpApiKey : Attribute
{
    public HttpApiKey(string _httpApi)
    {
        httpApi = _httpApi;
    }
    public string httpApi;
}

使用示例 

public class HttpId
{
    //示例，给id标记api
    [HttpApiKey("Register")]
    public const int registerId = 10001;
    [HttpApiKey("Login")]
    public const int loginId = 10002;


    public static void GetHttpApi()
    {
        //反射获取字段
        System.Reflection.FieldInfo[] fields = typeof(HttpId).GetFields();
        System.Type attType = typeof(HttpApiKey);
        for(int i = 0; i < fields.Length; i++)
        {
            if(fields[i].IsDefined(attType,false))
            {
                //获取id
                int httpId = (int)fields[i].GetValue(null);
                //获取api，读取字段的自定义Attribute
                object attribute = fields[i].GetCustomAttributes(typeof(HttpApiKey),false)[0];
                string httpApi = (attribute as HttpApiKey).httpApi;
            }
        }
    }
}