首页 > 代码库 > ASP.NET MVC 中使用用户控件——转

ASP.NET MVC 中使用用户控件——转

2024-07-06 12:39:41   223人阅读

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="http://www.mamicode.com/<%=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="width: 150px"> 
                </select> 
            </td> 
            <td style="text-align:right; width:80px"> 
                学历层次  
            </td> 
            <td> 
                <select id="edcuationLevel" style="width: 150px"> 
                </select> 
            </td> 
            <td style="text-align:right; width:80px"> 
                专业名称  
            </td> 
            <td> 
                <select id="professional" style="width: 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=http://www.mamicode.com/‘‘>请选择");  
        $.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=http://www.mamicode.com/‘‘>请选择");  
        $.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=http://www.mamicode.com/‘‘>请选择");  
        $.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=http://www.mamicode.com/‘0‘>请选择");  
        $.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="http://www.mamicode.com/<%=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 = "width: 150px" })%> 
            </td> 
            <td style="text-align: right; width: 80px"> 
                学历层次 
            </td> 
            <td> 
                <%:Html.DropDownList("edcuationLevel", ViewData["educationLevel"] as SelectList, "请选择", new { id = "edcuationLevel", style = "width: 150px" })%> 
            </td> 
            <td style="text-align: right; width: 80px"> 
                专业名称 
            </td> 
            <td> 
                <%:Html.DropDownList("professional", ViewData["professional"] as SelectList, "请选择", new { id = "professional", style = "width: 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


联系
我们