無廢話MVC入門教程七[Control中使用AOP]

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本文目標

一、能夠使用Control中的AOP實現非業務需求的功能

本文目錄

一、ActionFilterAttribute類

二、實現自定義Attribute

一、ActionFilterAttribute類

Action篩選條件的基類

using System;

namespace System.Web.Mvc
{
    // Summary:
    //     Represents the base class for filter attributes.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
    public abstract class ActionFilterAttribute : FilterAttribute, IActionFilter, IResultFilter
    {
        // Summary:
        //     Initializes a new instance of the System.Web.Mvc.ActionFilterAttribute class.
        protected ActionFilterAttribute();

        // Summary:
        //     Called by the ASP.NET MVC framework after the action method executes.
        //
        // Parameters:
        //   filterContext:
        //     The filter context.
        public virtual void OnActionExecuted(ActionExecutedContext filterContext);
        //
        // Summary:
        //     Called by the ASP.NET MVC framework before the action method executes.
        //
        // Parameters:
        //   filterContext:
        //     The filter context.
        public virtual void OnActionExecuting(ActionExecutingContext filterContext);
        //
        // Summary:
        //     Called by the ASP.NET MVC framework after the action result executes.
        //
        // Parameters:
        //   filterContext:
        //     The filter context.
        public virtual void OnResultExecuted(ResultExecutedContext filterContext);
        //
        // Summary:
        //     Called by the ASP.NET MVC framework before the action result executes.
        //
        // Parameters:
        //   filterContext:
        //     The filter context.
        public virtual void OnResultExecuting(ResultExecutingContext filterContext);
    }
}

OnActionExecuting：在Action執行之前執行該方法

OnActionExecuted：在Action執行之后執行該方法

OnResultExecuting：在Result執行之前執行該方法

OnResultExecuted：在Result執行之后執行該方法

二、實現自定義Attribute

在MVC框架基礎上實現自定義Attribute只需實現ActionFilterAttribute中的虛方法即可

1.代碼

using System.Web.Mvc;

namespace MVC3.Demo.App_Code
{
    public class LogActionFilter : ActionFilterAttribute
    {
        public string LogMessage { get; set; }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Write(@"在Action執行之前執行" + LogMessage + "<br />");
            base.OnActionExecuting(filterContext);
        }

        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.Write(@"在Action執行之后執行" + LogMessage + "<br />");
            base.OnActionExecuted(filterContext);
        }

        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Write(@"在Result執行之前執行" + LogMessage + "<br />");
            base.OnResultExecuting(filterContext);
        }

        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.Write(@"在Result執行之后執行" + LogMessage + "<br />");
            base.OnResultExecuted(filterContext);
        }
    }
}

2.使用

        [LogActionFilter(LogMessage = "日志寫入：Validation方法")]
        public ActionResult Validation()
        {
            return View();
        }

3.效果

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