默认情况下,一个表单只能有一个提交事件,这不难理解,但有时我们需要有多个实现,早在ASP时代就可以实现这个功能,难道到了MVC时代后,功能削减了?当然不是,这和MVC本身有关,微软在这方面比较提倡一个提交事件对应一个action,这和它自代的实例是相吻合的,而一个action可能会根据请求方式不同分为GET和POST两种,这样的设计确实很清晰,代码可能是这样
public ActionResult Index()
{ if (current.HasUserInfo) Response.Write(current.UserInfo.UserName); else Response.Write("没?有Dcookies"); return View(); } [HttpPost] public ActionResult Index(FormCollection form) { ClientHelper.StandUserInfo(new ClientUserBase { UserName = "zzl", UserID = "1", Password = "123", Email = "bobo" }); if (current.HasUserInfo) Response.Write(current.UserInfo.UserName); else Response.Write("没Dcookies"); return View(); }
而如果我们非要将三个按钮集成到一个action上也不是没有可能,我们可以借助.net的特性(attribute)功能实现
public class MultiButtonAttribute : ActionNameSelectorAttribute { public string Name { get; set; } public MultiButtonAttribute(string name) { this.Name = name; } public override bool IsValidName(ControllerContext controllerContext, string actionName, System.Reflection.MethodInfo methodInfo) { if (string.IsNullOrEmpty(this.Name)) { return false; } return controllerContext.HttpContext.Request.Form.AllKeys.Contains(this.Name); } }
而我们的Index方法会加上一个特性来实现多按钮提交的功能,代码如下
[HttpPost] [MultiButton("write")] public ActionResult Index(FormCollection form) { ClientHelper.StandUserInfo(new ClientUserBase { UserName = "zzl", UserID = "1", Password = "123", Email = "bobo" }); if (current.HasUserInfo) Response.Write(current.UserInfo.UserName); else Response.Write("没?有Dcookies"); return View(); } [HttpPost] [MultiButton("del")] public ActionResult Index(FormCollection form, int? a) { ClientHelper.UserLogout(); if (current.HasUserInfo) Response.Write(current.UserInfo.UserName); else Response.Write("没?有Dcookies"); return View(); }
其中[MultiButton("del")] 这个特性中的del代表前台按钮的name,而不是ID,这点需要注意一下。