ASP.NET MVC 中使用用户控件——转

讲讲怎么在 ASP.NET MVC2中使用用户控件。首先我们新建一个用户控件，

 

我们命名为SelectGroup.ascx，代码如下

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> 

<script language="javascript" type="text/javascript" src="<%=Url.Content("~/Areas/Util/Scripts/SelectGroup.js") %>"></script> 

<div> 

    <table> 

        <tr> 

            <td style="text-align:right"> 

                招生批次  

            </td> 

            <td> 

                <select id="admissionBatch" style=" 150px"> 

                </select> 

            </td> 

            <td style="text-align:right; 80px"> 

                学历层次  

            </td> 

            <td> 

                <select id="edcuationLevel" style=" 150px"> 

                </select> 

            </td> 

            <td style="text-align:right; 80px"> 

                专业名称  

            </td> 

            <td> 

                <select id="professional" style=" 150px"> 

                </select> 

            </td> 

        </tr> 

    </table> 

</div> 

我们再编写其对应的控制器如下

using System;  

using System.Collections.Generic;  

using System.Linq;  

using System.Web;  

using System.Web.Mvc;  

 

namespace EducationManage.Areas.Util.Controllers  

{  

    using Utility.Json;  

    using EducationManage.Areas.Util.Models;  

    public class SelectGroupController : Controller  

    {  

        //  

        // GET: /Util/SelectGroup/  

        SelectgroupEntities selectgroupEntities = new SelectgroupEntities();  

 

        /// <summary>  

        /// 招生批次  

        /// 李磊 2010-10-29  

        /// </summary>  

        /// <returns></returns>  

        public JsonResult GetAdmissionBatch()  

        {  

            List<SG_Admission_Batchs> admissionBatchsList =selectgroupEntities.admission_batchs.ToList();  

            return Json(admissionBatchsList, JsonRequestBehavior.AllowGet);  

        }  

 

        /// <summary>  

        /// 学历层次  

        /// 李磊 2010-10-29  

        /// </summary>  

        /// <returns></returns>  

        public JsonResult GetEducationLevel()  

        {  

            List<SG_Education_Levels> educationLevelList = selectgroupEntities.education_levels.ToList();  

            return Json(educationLevelList, JsonRequestBehavior.AllowGet);  

        }  

 

        /// <summary>  

        /// 专业  

        /// 李磊 2010-10-29  

        /// </summary>  

        /// <returns></returns>  

        public JsonResult GetProfessional()  

        {  

            List<SG_Professional> professionalList = selectgroupEntities.professional.ToList();  

            return Json(professionalList, JsonRequestBehavior.AllowGet);  

        }  

 

        /// <summary>  

        /// 学籍批次  

        /// 李磊 2010-10-29  

        /// </summary>  

        /// <returns></returns>  

        public JsonResult GetRollBatch()  

        {  

            List<SG_Roll_Batchs> rollBatchList = selectgroupEntities.roll_batchs.ToList();  

            return Json(rollBatchList, JsonRequestBehavior.AllowGet);  

        }  

 

        /// <summary>  

        /// 专业学历层次联动  

        /// 李磊 2010-10-29  

        /// </summary>  

        /// <param name="id"></param>  

        /// <returns></returns>  

        public JsonResult GetProfessionalByEducationLevel(string id)  

        {  

            try 

            {  

                List<string> professionalIdList = selectgroupEntities.professional_educationlevel.Where(pe => pe.education_id == id).Select(pe => pe.prefessional_code).ToList();  

                List<SG_Professional> professionalList = selectgroupEntities.professional.Where(p => professionalIdList.Contains(p.prefessional_code)).ToList();  

                return Json(professionalList, JsonRequestBehavior.AllowGet);  

            }  

            catch 

            {  

                return null;  

            }  

        }  

    }  

}  

好的，我们接着编写js.

 首先在js的顶层引入 ///<reference path = "../../../Scripts/jQuery-1.4.1.js"/>这样编写js代码就有智能提示，如下

 

$(document).ready(function () {  

      

    $.ajaxSetup({  

        cache: false 

    });  

    $.getJSON("/SelectGroup/GetAdmissionBatch/", function (data) {  

        $("#admissionBatch").append("<option value=''>请选择</option>");  

        $.each(data, function (i, item) {  

            $("<option></option>")  

            .val(item["admission_batch_id"])  

            .text(item["name"])  

            .appendTo($("#admissionBatch"));  

        });  

 

    });  

 

    $.getJSON("/SelectGroup/GetEducationLevel/", function (data) {  

        $("#edcuationLevel").append("<option value=''>请选择</option>");  

        $.each(data, function (i, item) {  

            $("<option></option>")  

            .val(item["education_id"])  

            .text(item["name"])  

            .appendTo($("#edcuationLevel"));  

        });  

 

    });  

 

    $.getJSON("/SelectGroup/GetProfessional/", function (data) {  

        $("#professional").append("<option value=''>请选择</option>");  

        $.each(data, function (i, item) {  

            $("<option></option>")  

            .val(item["prefessional_code"])  

            .text(item["name"])  

            .appendTo($("#professional"));  

        });  

 

    });  

 

    $("#edcuationLevel").change(function () {  

        $("#professional").empty();  

        $("#professional").append("<option value='0'>请选择</option>");  

        $.getJSON("/SelectGroup/GetProfessionalByEducationLevel/" + $("#edcuationLevel").val(), function (data) {  

            $.each(data, function (i, item) {  

                $("<option></option>")  

            .val(item["prefessional_code"])  

            .text(item["name"])  

            .appendTo($("#professional"));  

            });  

 

        });  

    });  

 

}) 

ok，好了，我们看看在页面怎么引用

<%Html.RenderPartial("~/Areas/Util/Views/Shared/SelectGroup.ascx"); %> 

只要你将这段代码放在页面上即可。Html.RenderPartial有很多重载，你也可以给用户控件传递一个需要绑定的对象。说到这里谈谈Html.RenderPartial和Html.Partial的区别。Html.RenderPartial是直接输出至当前HttpContext，而Html.Partial是将视图内容直接生成一个字符串并返回。所以在引用的时候不一样分别为<% Html.RenderPartial("~/Areas/Util/Views/Shared/SelectGroup.ascx"); %>和<%=Html.Partial("~/Areas/Util/Views/Shared/SelectGroup.ascx"); %>。说到这两个不免要说Html.RenderAction，它是通过Controller中的Action来调用用户控件。上面的代码大家可以根据js和控制器代码看到，每个下拉列表的绑定都有自己的控制器返回数据，在页面加载完成的时候去调用自己的控制器获取下拉列表数据。如果我们用Html.RenderAction就没有那么麻烦了，看看控制器代码

using System;  

using System.Collections.Generic;  

using System.Linq;  

using System.Web;  

using System.Web.Mvc;  

 

namespace EducationManage.Areas.Util.Controllers  

{  

    using Utility.Json;  

    using EducationManage.Areas.Util.Models;  

    public class SectionGroupController : Controller  

    {  

        //  

        // GET: /Util/SectionGroup/  

        SelectgroupEntities selectgroupEntities = new SelectgroupEntities();  

        public ActionResult Index()  

        {  

            List<SG_Admission_Batchs> admissionBatchList = selectgroupEntities.admission_batchs.ToList();  

            SelectList admissionBatch = new SelectList(admissionBatchList, "admission_batch_id", "name", "");  

            ViewData.Add("admissionBatch", admissionBatch);  

 

            List<SG_Education_Levels> educationLevelList = selectgroupEntities.education_levels.ToList();  

            SelectList educationLevel = new SelectList(educationLevelList, "education_id", "name", "");  

            ViewData.Add("educationLevel", educationLevel);  

 

            List<SG_Professional> professionalList = selectgroupEntities.professional.ToList();  

            SelectList professional = new SelectList(professionalList, "prefessional_code", "name", "");  

            ViewData.Add("professional", professional);  

            return PartialView("~/Areas/Util/Views/Shared/SectionGroup.ascx");  

        }  

 

    }  

}  

再看看前台

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> 

<script language="javascript" type="text/javascript" src="<%=Url.Content("~/Areas/Util/Scripts/SelectGroup.js") %>" /> 

<div> 

    <table> 

        <tr> 

            <td style="text-align: right"> 

                招生批次 

            </td> 

            <td> 

                <%:Html.DropDownList("admissionBatch", ViewData["admissionBatch"] as SelectList, "请选择", new { id = "admissionBatch", style = " 150px" })%> 

            </td> 

            <td style="text-align: right; 80px"> 

                学历层次 

            </td> 

            <td> 

                <%:Html.DropDownList("edcuationLevel", ViewData["educationLevel"] as SelectList, "请选择", new { id = "edcuationLevel", style = " 150px" })%> 

            </td> 

            <td style="text-align: right; 80px"> 

                专业名称 

            </td> 

            <td> 

                <%:Html.DropDownList("professional", ViewData["professional"] as SelectList, "请选择", new { id = "professional", style = " 150px" })%> 

            </td> 

        </tr> 

    </table> 

</div> 

在这里我们一次性就获取到了所有下拉列表要绑定的数据。我们只需要在前台这样应用即可<%Html.RenderAction("Index", "SectionGroup");%>。好了，在MVC2中使用用户控件就是这么简单。

本文出自 “微软技术” 博客，请务必保留此出处http://leelei.blog.51cto.com/856755/412702