Asp.Net WebApi学习教程之增删改查
webapi简介
在asp.net中,创建一个HTTP服务,有很多方案,以前用ashx,一般处理程序(HttpHandler),现在可以用webapi
微软的web api是在vs2012上的mvc4项目绑定发行的,它提出的web api是完全基于RESTful标准的,完全不同于之前的(同是SOAP协议的)wcf和webService,它是简单,代码可读性强的,上手快的,如果要拿它和web服务相比,我会说,它的接口更标准,更清晰,没有混乱的方法名称,有的只有几种标准的请求,如get,post,put,delete等,它们分别对应的几个操作,下面讲一下:
GET:获取
POST:添加
PUT:修改
DELETE:删除
注意上面公开的API接口都是在XMLHttpRequest情况下调用的,当然你可以使用jquery的ajax组件来完成这个请求调用,它的代码更加面向对象,下面会举例说明。
WebAPI是根据请求头信息(Accept Header)来查找已经格式化注册的响应头信息(Content-Type)来确定它应该返回的输出类型json/xml,浏览器访问基本都是xml,如果只需要json的话可以通过Global.asax设置
protected void Application_Start(object sender, EventArgs e) {//默认JSON GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear(); }
webapi示例(CRUD)
环境:vs2015、iis7、webapi2.0、.net4.5.2
功能:webapi+ajax实现增删改查
模型
namespace cms.Model {public partial class student { public int ID { get; set; } public string name { get; set; } public int sex { get; set; } public int age { get; set; } public System.DateTime timesAdd { get; set; } } }
修改webapi路由
webapi默认路由api/{controller}/{id},如果不喜欢可以修改为api/{controller}/{action}/{id},下边是修改后的代码
public static void Register(HttpConfiguration config) { config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{action}/{id}", defaults: new { id = RouteParameter.Optional } ); }
Controller代码
using System; using System.Collections.Generic; using System.Net; using System.Web.Http; using cms.BLL; using cms.Model; namespace cms.Web.API { public class StudentController : ApiController { public studentBLL bll = new studentBLL(); // GET: /api/student/GetList public IEnumerable<student> GetList() { var list = bll.FindList(); return list; } // GET: api/Student/Get/5 public student Get(int id) { var model = bll.Find(id); if (model == null) { throw new HttpResponseException(HttpStatusCode.NotFound); } return model; } //添加方法1:如果要添加的字段和模型刚好匹配就用这个 // POST: api/Student/Post public student Post([FromBody]student entity) { entity.timesAdd = DateTime.Now; return bll.Add(entity); //dynamic data = new { name = _name, age = _age }; //return Json<dynamic>(data); } //添加方法2:如果要添加的字段和模型不匹配就用这个 // POST: api/Student/PostAdd //注意:webapi post接受数据dynamic,ajax调用时也得把json格式化为字符串才行 public student PostAdd(dynamic obj) { student model = new student(); model.name = obj.name; model.sex = obj.sex; model.age = obj.age; model.timesAdd = DateTime.Now; return bll.Add(model); } // PUT: api/Student/Put/5 public void Put(int id, [FromBody]student entity) { student model = bll.Find(id); model.name = entity.name; model.sex = entity.sex; model.age = entity.age; if (!bll.Update(model)) { throw new HttpResponseException(HttpStatusCode.NotFound); } } // DELETE: api/Student/Delete/5 public void Delete(int id) { if (!bll.Delete(id)) { throw new HttpResponseException(HttpStatusCode.NotFound); } } } }
html代码
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>webapi教程</title> <script type="text/javascript" src="Scripts/jquery-1.8.2.js"></script> <style type="text/css"> h2 { border-bottom: solid 1px #ccc; padding-bottom: 10px; } #box_list span { margin-right: 30px; width: 100px; display: inline-block; } .time { width: 200px !important; } </style> </head> <body> <h2>webapi create</h2> <div> <p><input type="hidden" id="iid" /></p> <p>姓名:<input type="text" id="name" /></p> <p>性别:<input type="text" id="sex" /></p> <p>年龄:<input type="text" id="age" /></p> <p><input type="button" id="btnAdd" value="添加" /> <input type="button" id="btnAdd2" value="添加2" /> <input type="button" id="btnEdit" value="修改" /></p> </div> <h2>webapi list</h2> <div id="box_list"></div> <div> <input type="button" id="btnDel" value="删除" /> <input type="button" id="btnView" value="查看" /> </div> <div id="box_view"></div> <script type="text/javascript"> $(function () { GetList(); $("#btnAdd").click(function () { var _data = { name: $("#name").val(), sex: $("#sex").val(), age: $("#age").val() }; $.ajax({ type: "post", url: "/api/Student/Post", data: _data, dataType: "json", success: function (data) { alert("添加成功"); GetList(); }, error: function () { alert("添加失败"); } }); }) $("#btnAdd2").click(function () { var _data = JSON.stringify({ name: $("#name").val(), sex: $("#sex").val(), age: $("#age").val() }); $.ajax({ type: "post", url: "/api/Student/PostAdd", data: _data, dataType: "json", contentType: 'application/json', success: function (data) { alert("添加成功"); GetList(); }, error: function () { alert("添加失败"); } }); }) $("#btnDel").click(function () { var _iid = $('input:radio[name=iid]:checked').val();; $.ajax({ type: "Delete", url: "/api/Student/Delete/" + _iid, success: function (data) { alert("删除成功"); $('input:radio[name=iid]:checked').parents("p").remove(); }, error: function () { alert("删除失败"); } }); }) $("#btnView").click(function () { var _iid = $('input:radio[name=iid]:checked').val();; $.ajax({ type: "get", url: "/api/Student/get/" + _iid, dataType: "json", success: function (data) { name: $("#iid").val(data.ID); name: $("#name").val(data.name); sex: $("#sex").val(data.sex); age: $("#age").val(data.age) }, error: function () { alert("获取失败"); } }); }) $("#btnEdit").click(function () { var _data = { name: $("#name").val(), sex: $("#sex").val(), age: $("#age").val() }; $.ajax({ type: "put", url: "/api/Student/Put/" + $("#iid").val(), data: _data, success: function (data) { alert("修改成功"); GetList(); }, error: function () { alert("修改失败"); } }); }) }) function GetList() { $("#box_list").html(""); $.ajax({ type: "GET", url: "/api/student/GetList", dataType: "json", success: function (data) { $.each(data, function (i, item) { $("#box_list").append("<p><span><input type='radio' name='iid' value='" + item.ID + "' />" + item.ID + "</span><span>" + item.name + "</span><span>" + item.sex + "</span><span>" + item.age + "</span><span class='time'>" + item.timesAdd + "</span></p>") }); } }); } </script> </body> </html>
效果图
常见问题:
如果在做修改和删除操作时报405错误(webapi delete Method Not Allowed),说明是iis把put和delete请求禁止了,需要在web.config中设置一下就ok了
<system.webServer> <modules> <remove name="WebDAVModule" /> </modules> <handlers> <remove name="WebDAV" /> </handlers> </system.webServer>
//成功一定有方法,失败一定有原因。