返璞归真asp.net mvc 1.0(3) - Controller/Action

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返璞归真asp.net mvc 1.0(3) - Controller/Action

作者： webabcd


介绍
asp.net mvc 之 Controller 和 Action

• Controller 类必须以字符串 "Controller" 做类名称的结尾，字符串 Controller 之前的字符串为 Controller 的名称，类中的方法名为 Action 的名称
• Action 可以没有返回值。如果 Action 要有返回值的话，其类型必须是 ActionResult

示例
1、Controller/Action
ControllerDemoController.cs

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Web;
using  System.Web.Mvc;
using  System.Web.Mvc.Ajax;

using  System.IO;

namespace  MVC.Controllers
{
    /**//// <summary>
    /// Controller 类必须以字符串 "Controller" 做类名称的结尾，字符串 Controller 之前的字符串为 Controller 的名称，类中的方法名为 Action 的名称
    /// </summary>
    public class ControllerDemoController : Controller
    {
        // [NonAction] - 当前方法仅为普通方法，不解析为 Action
        // [AcceptVerbs(HttpVerbs.Post)] - 声明 Action 所对应的 http 方法

        /**//// <summary>
        /// Action 可以没有返回值
        /// </summary>
        public void Void()
        {
            Response.Write(string.Format("<span style='color: red'>{0}</span>", "void"));
        }

        /**//// <summary>
        /// 如果 Action 要有返回值的话，其类型必须是 ActionResult
        /// EmptyResult - 空结果
        /// </summary>
        public ActionResult EmptyResult()
        {
            Response.Write(string.Format("<span style='color: red'>{0}</span>", "EmptyResult"));
            return new EmptyResult();
        }

        /**//// <summary>
        /// Controller.Redirect() - 转向一个指定的 url 地址
        /// 返回类型为 RedirectResult
        /// </summary>
        public ActionResult RedirectResult()
        {
            return base.Redirect("~/ControllerDemo/ContentResult");
        }

        /**//// <summary>
        /// Controller.RedirectToAction() - 转向到指定的 Action
        /// 返回类型为 RedirectToRouteResult
        /// </summary>
        public ActionResult RedirectToRouteResult()
        {
            return base.RedirectToAction("ContentResult");
        }

        /**//// <summary>
        /// Controller.Json() - 将指定的对象以 JSON 格式输出出来
        /// 返回类型为 JsonResult
        /// </summary>
        public ActionResult JsonResult(string name)
        {
            System.Threading.Thread.Sleep(1000);

            var jsonObj = new { Name = name, Age = new Random().Next(20, 31) };
            return base.Json(jsonObj);
        }

        /**//// <summary>
        /// Controller.JavaScript() - 输出一段指定的 JavaScript 脚本
        /// 返回类型为 JavaScriptResult
        /// </summary>
        public ActionResult JavaScriptResult()
        {
            return base.JavaScript("alert('JavaScriptResult')");
        }

        /**//// <summary>
        /// Controller.Content() - 输出一段指定的内容
        /// 返回类型为 ContentResult
        /// </summary>
        public ActionResult ContentResult()
        {
            string contentString = string.Format("<span style='color: red'>{0}</span>", "ContentResult");
            return base.Content(contentString);
        }

        /**//// <summary>
        /// Controller.File() - 输出一个文件（字节数组）
        /// 返回类型为 FileContentResult
        /// </summary>
        public ActionResult FileContentResult()
        {
            FileStream fs = new FileStream(Request.PhysicalApplicationPath + "Content/loading.gif", FileMode.Open);
            int length = (int)fs.Length;
            byte[] buffer = new byte[length];
            fs.Read(buffer, 0, length);
            fs.Close();

            return base.File(buffer, "image/gif");
        }

        // <summary>
        /**//// Controller.File() - 输出一个文件（文件地址）
        /// 返回类型为 FileContentResult
        /// </summary>
        public ActionResult FilePathResult()
        {
            var path = Request.PhysicalApplicationPath + "Content/loading.gif";
            return base.File(path, "image/gif");
        }

        // <summary>
        /**//// Controller.File() - 输出一个文件（文件流）
        /// 返回类型为 FileContentResult
        /// </summary>
        public ActionResult FileStreamResult()
        {
            FileStream fs = new FileStream(Request.PhysicalApplicationPath + "Content/loading.gif", FileMode.Open);

            return base.File(fs, @"image/gif");
        }

        /**//// <summary>
        /// HttpUnauthorizedResult - 响应给客户端错误代码 401（未经授权浏览状态），如果程序启用了 Forms 验证，并且客户端没有任何身份票据，则会跳转到指定的登录页
        /// </summary>
        public ActionResult HttpUnauthorizedResult()
        {
            return new HttpUnauthorizedResult();
        }

        /**//// <summary>
        /// Controller.PartialView() - 寻找 View ，即 .ascx 文件
        /// 返回类型为 PartialViewResult
        /// </summary>
        public ActionResult PartialViewResult()
        {
            return base.PartialView();
        }

        /**//// <summary>
        /// Controller.View() - 寻找 View ，即 .aspx 文件
        /// 返回类型为 ViewResult
        /// </summary>
        public ActionResult ViewResult()
        {
            // 如果没有指定 View 名称，则寻找与 Action 名称相同的 View
            return base.View();
        }

        /**//// <summary>
        /// 用于演示处理 JSON 的
        /// </summary>
        public ActionResult JsonDemo()
        {
            return View();
        }

        /**//// <summary>
        /// 用于演示上传文件的
        /// </summary>
        public ActionResult UploadDemo()
        {
            return View();
        }

        /**//// <summary>
        /// 用于演示 Get 方式调用 Action
        /// id 是根据路由过来的；param1和param2是根据参数过来的
        /// </summary>
        [AcceptVerbs(HttpVerbs.Get)]
        public ActionResult GetDemo(int id, string param1, string param2)
        {
            ViewData["ID"] = id;
            ViewData["Param1"] = param1;
            ViewData["Param2"] = param2;

            return View();
        }

        /**//// <summary>
        /// 用于演示 Post 方式调用 Action
        /// </summary>
        /// <remarks>
        /// 可以为参数添加声明，如：[Bind(Include = "xxx")] - 只绑定指定的属性（参数），多个用逗号隔开
        /// [Bind(Exclude = "xxx")] - 不绑定指定的属性（参数），多个用逗号隔开
        /// [Bind] 声明同样可以作用于 class 上
        /// </remarks>
        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult PostDemo(FormCollection fc)
        {
            ViewData["Param1"] = fc["param1"];
            ViewData["Param2"] = fc["param2"];

            // 也可以用 Request.Form 方式获取 post 过来的参数

            // Request.Form 内的参数也会映射到同名参数。例如，也可用如下方式获取参数  
            // public ActionResult PostDemo(string param1, string param2)

            return View("GetDemo");
        }

        /**//// <summary>
        /// 处理上传文件的 Action
        /// </summary>
        /// <param name="file1">与传过来的 file 类型的 input 的 name 相对应</param>
        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult UploadFile(HttpPostedFileBase file1)
        {
            // Request.Files - 获取需要上传的文件。当然，其也会自动映射到同名参数
            // HttpPostedFileBase hpfb = Request.Files[0] as HttpPostedFileBase;

            string targetPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "Upload", Path.GetFileName(file1.FileName));
            file1.SaveAs(targetPath);

            return View("UploadDemo");
        }
    }
}

2、Get 方式和 Post 方式调用 Controller 的 Demo
GetDemo.aspx

<% @ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage"  %>

< asp:Content  ID ="Content1"  ContentPlaceHolderID ="TitleContent"  runat ="server" >
    GetDemo
</ asp:Content >
< asp:Content  ID ="Content2"  ContentPlaceHolderID ="MainContent"  runat ="server" >
     < h2 >
        GetDemo </ h2 >
     < div >
         <% =  ViewData[ " ID " ]  %> </ div >
     < div >
         <% =  ViewData[ " Param1 " ]  %> </ div >
     < div >
         <% =  ViewData[ " Param2 " ]  %> </ div >
        
     < form  action ="/ControllerDemo/PostDemo"  method ="post" >
     < input  id ="param1"  name ="param1"   />
     &nbsp;
     < input  id ="param2"  name ="param2"   />
     &nbsp;
     < input  type ="submit"  value ="submit"   />
     </ form >
</ asp:Content >

3、处理 JSON 的 Demo
JsonDemo.aspx

<% @ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage"  %>

< asp:Content  ID ="Content1"  ContentPlaceHolderID ="TitleContent"  runat ="server" >
    JsonDemo
</ asp:Content >
< asp:Content  ID ="Content2"  ContentPlaceHolderID ="MainContent"  runat ="server" >

     < script  src ="http://www.cnblogs.com/Scripts/jquery-1.3.2.js"  type ="text/javascript" ></ script >

     < script  type ="text/javascript" >

        $.ajaxSetup({
            cache: false
        });

        $(document).ready(
            function() {

                $('#loading').hide();

                $('#btnFind').click(
                    function(event) {
                        event.preventDefault();

                        $('#loading').show();

                        $.getJSON(
                            "/ControllerDemo/JsonResult", // 获取 JSON
                            { name: $('#txtName')[0].value },
                            function(data) {
                                $('#result').append("name: ");
                                $('#result').append(data.Name);
                                $('#result').append(" - ");
                                $('#result').append("age: ");
                                $('#result').append(data.Age);
                                $('#result').append("<br />");

                                $('#loading').hide();
                            }
                        )
                    }
                )
            }
        )
        
     </ script >

     < h2 >
        JsonDemo </ h2 >
     < div  style ="margin: 20px 0px" >
         < input  id ="txtName"  value ="webabcd"   />
         &nbsp;&nbsp;   < a  href ="#"  id ="btnFind" > Find </ a >   &nbsp;&nbsp;   < span  id ="loading"  style ="border: 1px solid #000000;
            background-color: #FFFFCC; vertical-align: middle; padding: 6px" >
             < img  src ="http://www.cnblogs.com/Content/Images/loading.gif"  alt ="Loading"   /> &nbsp; Loading </ span >
         < div  id ="result"  style ="margin: 10px 0px"   />
     </ div >
</ asp:Content >

4、上传文件的 Demo
UploadDemo.aspx

<% @ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage"  %>

< asp:Content  ID ="Content1"  ContentPlaceHolderID ="TitleContent"  runat ="server" >
    UploadDemo
</ asp:Content >
< asp:Content  ID ="Content2"  ContentPlaceHolderID ="MainContent"  runat ="server" >
     < h2 >
        UploadDemo </ h2 >
     <!-- action - 调用上传文件的 Action -->
     < form  action ="/ControllerDemo/UploadFile"  method ="post"  enctype ="multipart/form-data" >
     < input  type ="file"  id ="file1"  name ="file1"   />
     < input  type ="submit"  id ="upload"  name ="upload"  value ="上传"   />
     </ form >
</ asp:Content >

OK
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