jquery ajax调用webservice(C#)要注意的几个事项：
1、web.config里需要配置2个地方
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</httpHandlers>
在<system.web></system.web>之间加入
<webServices>
<protocols>
<add name="HttpPost" />
<add name="HttpGet" />
</protocols>
</webServices>
2.正确地编写webserivce的代码
?1 /// <summary> ?2 ????/// UserValidate 的摘要说明 ?3 ????/// </summary> ?4 ????[WebService(Namespace = "http://tempuri.org/")] ?5 ????[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] ?6 ????[System.ComponentModel.ToolboxItem(false)] ?7 ????// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。 ?8 ?????[System.Web.Script.Services.ScriptService] ?9 ????public class UserValidate : System.Web.Services.WebService 10 ????{ 11 ????????DFHon.Content.Common.rootPublic rp = new DFHon.Content.Common.rootPublic(); 12 ????????[WebMethod] 13 ????????[ScriptMethod(ResponseFormat = ResponseFormat.Json)] 14 ????????public string ValidateUserLogState() 15 ????????{ 16 ????????????string result = ""; 17 ????????????HttpCookie cookie = HttpContext.Current.Request.Cookies["DHFonMenberInfo"]; 18 ????????????if (cookie != null) 19 ????????????{ 20 ????????????????string username = System.Web.HttpUtility.UrlDecode(cookie["MenberName"]); 21 ????????????????int ipoint = 0; 22 ????????????????int gpoint = 0; 23 ????????????????try 24 ????????????????{ 25 ????????????????????DataTable dt = UserBll.ExecuteUserAllInfo(username); 26 ?27 ????????????????????if (dt.Rows.Count > 0) 28 ????????????????????{ 29 ????????????????????????ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString()); 30 ????????????????????????gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString()); 31 ????????????????????} 32 ????????????????} 33 ????????????????catch 34 ????????????????{ } 35 ????????????????result = "{‘user‘:{‘id‘:‘" + cookie["UserId"] + "‘,‘name‘:‘" + username + "‘,‘message‘:‘" + rp.getUserMsg(DFHon.Global.CurrentCookie.UserName) + "‘,‘ipoint‘:‘" + ipoint.ToString() + "‘,‘gpoint‘:‘" + gpoint.ToString() + "‘}}"; 36 ????????????} 37 ????????????else 38 ????????????{ 39 ????????????????result = "{‘user‘:{‘id‘:‘0‘,‘name‘:‘‘,‘message‘:‘0‘,‘ipoint‘:‘0‘,‘gpoint‘:‘0‘}}"; 40 ????????????} 41 ????????????return result; 42 ????????} 43 ?44 ????????[WebMethod] 45 ????????[ScriptMethod(ResponseFormat = ResponseFormat.Json)] 46 ????????public string UserLogin(string userName, string userPwd) 47 ????????{ 48 ????????????string returnVal = ""; 49 ????????????try 50 ????????????{ 51 ????????????????GlobalUserInfo info; 52 ????????????????DFHon.Content.UserLogin _UserLogin = new DFHon.Content.UserLogin(); 53 ????????????????EnumLoginState state = _UserLogin.PersonLogin(HttpUtility.UrlDecode(userName), userPwd, out info); 54 ????????????????if (state == EnumLoginState.Succeed) 55 ????????????????{ 56 ????????????????????DFHon.Global.CurrentCookie.Set(info); 57 ????????????????????DFHon.API.PDO.DiscuzNT.PassportLogin.UserLogin(Server.UrlDecode(userName), userPwd, -1); 58 ????????????????????int ipoint = 0; 59 ????????????????????int gpoint = 0; 60 ????????????????????DataTable dt = UserBll.ExecuteUserAllInfo(userName); 61 ?62 ????????????????????if (dt.Rows.Count > 0) 63 ????????????????????{ 64 ????????????????????????ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString()); 65 ????????????????????????gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString()); 66 ????????????????????} 67 ????????????????????returnVal = "{‘user‘:{‘id‘:‘" + info.UserId.ToString() + "‘,‘name‘:‘" + info.UserName + "‘,‘message‘:‘" + rp.getUserMsg(userName) + "‘,‘ipoint‘:‘" + ipoint.ToString() + "‘,‘gpoint‘:‘" + gpoint.ToString() + "‘}}"; 68 ????????????????} 69 ????????????????else 70 ????????????????{ 71 ????????????????????int ids = 0;//状态：-2用户被锁定 -1用户名密码错误 72 ????????????????????switch (state) 73 ????????????????????{ 74 ????????????????????????case EnumLoginState.Err_Locked: 75 ????????????????????????????ids = -2; 76 ????????????????????????????break; 77 ????????????????????????case EnumLoginState.Err_UserNameOrPwdError: 78 ????????????????????????????ids = -1; 79 ????????????????????????????break; 80 ????????????????????????default: 81 ????????????????????????????break; 82 ????????????????????} 83 ????????????????????returnVal = "{‘user‘:{‘id‘:‘" + ids + "‘,‘name‘:‘‘,‘message‘:‘0‘,‘ipoint‘:‘0‘,‘gpoint‘:‘0‘}}"; 84 ????????????????} 85 ????????????} 86 ????????????catch 87 ????????????{ 88 ????????????????returnVal = "{‘user‘:{‘id‘:‘0‘,‘name‘:‘‘,‘message‘:‘0‘,‘ipoint‘:‘0‘,‘gpoint‘:‘0‘}}"; 89 ????????????} 90 ????????????return returnVal; 91 ????????} 92 ????????[WebMethod] 93 ????????public string UserLogout() 94 ????????{ 95 ????????????if (HttpContext.Current.Request.Cookies["DHFonMenberInfo"] != null) 96 ????????????{ 97 ????????????????HttpCookie cookie = new HttpCookie("DHFonMenberInfo"); 98 ????????????????cookie.Expires = System.DateTime.Now.AddDays(-1); 99 ????????????????cookie.Domain = DFHon.Config.BaseConfig.getV("weblogin");100 ????????????????HttpContext.Current.Response.AppendCookie(cookie);101 ????????????}102 ????????????return "1";103 ????????}104 ????????DFHon.Content.user UserBll = new DFHon.Content.user();105 ????????[WebMethod]106 ????????public string ValidateUserEmail(string email)107 ????????{108 ????????????string result = "0";//返回的结果 -2邮箱为空 -1邮箱格式不正确 0邮箱存在 1填写正确109 ????????????if (string.IsNullOrEmpty(email))110 ????????????{111 ????????????????result = "-2";//邮箱为空112 ????????????}113 ????????????else if (!IsValidEmail(email))114 ????????????{115 ????????????????result = "-1";//邮箱格式不正确116 ????????????}117 ????????????else if (UserBll.sel_useremail(email) > 0)118 ????????????{119 ????????????????result = "0";//邮箱存在120 ????????????}121 ????????????else122 ????????????{123 ????????????????result = "1";//可以注册124 ????????????}125 ????????????return result;126 ????????}127 128 ????????[WebMethod]129 ????????public string ValidateUserName(string username)130 ????????{131 ????????????string result = "0";//返回值：-1用户名长度为2-16;0用户名存在;1可以注册132 ????????????if (username == "" || username == null || username.Length < 2 || username.Length > 16)133 ????????????{134 ????????????????result = "-1";135 ????????????}136 ????????????else if (UserBll.sel_username(username) != 0)137 ????????????{138 ????????????????result = "0";139 ????????????}140 ????????????else141 ????????????{142 ????????????????result = "1";143 ????????????}144 ????????????return result;145 ????????}146 147 ????????public bool IsValidEmail(string strIn)148 ????????{ // Return true if strIn is in valid e-mail format. 149 ????????????return System.Text.RegularExpressions.Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");150 ????????}151 ????} ?1 <script> ?2 ????????$(function() { ?3 ????????????$("#userloging").show(); ?4 ????????????//登录框处理开始 ?5 ????????????//加载登录状态 ?6 ????????????$.ajax({ ?7 ????????????????type: "POST", //访问WebService使用Post方式请求 ?8 ????????????????contentType: "application/json;charset=utf-8", //WebService 会返回Json类型 ?9 ????????????????url: "/API/Service/UserValidate.asmx/ValidateUserLogState", //调用WebService 10 ????????????????data: "{}", //Email参数 11 ????????????????dataType: ‘json‘, 12 ????????????????beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); }, 13 ????????????????error: function(x, e) { }, 14 ????????????????success: function(response) { //回调函数，result，返回值 15 ????????????????????$("#userloging").hide(); 16 ????????????????????var json = eval(‘(‘ + response.d + ‘)‘); 17 ????????????????????var userid = json.user.id; 18 ????????????????????if (userid > 0) { 19 ????????????????????????$("#spanusername").html(json.user.name); 20 ????????????????????????$("#spanmessagenum").html(json.user.message); 21 ????????????????????????$("#userloginsucced").show(); 22 ????????????????????????$("#userloginbox").hide(); 23 ????????????????????} 24 ????????????????} 25 ????????????}); 26 ????????????//登录 27 ????????????$("#userlogbutton").click(function() { 28 ????????????????29 ????????????????var username = $("#username").val(); 30 ????????????????var userpwd = $("#userpassword").val(); 31 ????????????????if (username != "" && userpwd != "") { 32 ????????????????????$("#userloging").show(); 33 ????????????????????$.ajax({ 34 ????????????????????????type: "POST", //访问WebService使用Post方式请求 35 ????????????????????????contentType: "application/json;charset=utf-8", //WebService 会返回Json类型 36 ????????????????????????url: "/API/Service/UserValidate.asmx/UserLogin", //调用WebService 37 ????????????????????????data: "{userName:‘" + username + "‘,userPwd:‘" + userpwd + "‘}", //Email参数 38 ????????????????????????dataType: ‘json‘, 39 ????????????????????????beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); }, 40 ????????????????????????error: function(x, e) { 41 ????????????????????????}, 42 ????????????????????????success: function(result) { //回调函数，result，返回值 43 ????????????????????????????$("#userloging").hide(); 44 ????????????????????????????var json = eval(‘(‘ + result.d + ‘)‘); 45 ????????????????????????????var userid = json.user.id; 46 ????????????????????????????if (userid > 0) { 47 ????????????????????????????????$("#spanusername").html(json.user.name); 48 ????????????????????????????????$("#spanmessagenum").html(json.user.message); 49 ????????????????????????????????$("#userloginsucced").show(); 50 ????????????????????????????????$("#userloginbox").hide(); 51 ????????????????????????????} 52 ????????????????????????????else { 53 ????????????????????????????????switch (userid) { 54 ????????????????????????????????????case -2: 55 ????????????????????????????????????????alert("用户被锁定！请30分钟后再登录！"); 56 ????????????????????????????????????????$("#username").focus(); 57 ????????????????????????????????????????break; 58 ????????????????????????????????????case -1: 59 ????????????????????????????????????????alert("用户名或密码错误！请核对您的用户名和密码！"); 60 ????????????????????????????????????????$("#userpassword").focus(); 61 ????????????????????????????????????????break; 62 ????????????????????????????????????default: 63 ????????????????????????????????????????alert("登录失败！请核对您的用户名和密码之后重试！"); 64 ????????????????????????????????????????$("#userpassword").focus(); 65 ????????????????????????????????????????break; 66 ????????????????????????????????} 67 ????????????????????????????} 68 ????????????????????????} 69 ????????????????????}); 70 ????????????????} 71 ????????????????else if (username == "") { 72 ????????????????????alert("用户名不能为空！"); 73 ????????????????????$("#username").focus(); 74 ????????????????} 75 ????????????????else if (userpwd == "") { 76 ????????????????????alert("密码不能为空！"); 77 ????????????????????$("#userpassword").focus(); 78 ????????????????} 79 ????????????}); 80 ????????????//退出 81 ????????????$("#logout").click(function() { 82 ????????????????$("#userloging").show(); 83 ????????????????$.ajax({ 84 ????????????????????type: "POST", //访问WebService使用Post方式请求 85 ????????????????????contentType: "application/json;utf-8", //WebService 会返回Json类型 86 ????????????????????url: "/API/Service/UserValidate.asmx/UserLogout", //调用WebService 87 ????????????????????data: "{}", //Email参数 88 ????????????????????dataType: ‘json‘, 89 ????????????????????beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); }, 90 ????????????????????success: function(result) { //回调函数，result，返回值 91 ????????????????????????$("#userloging").hide(); 92 ????????????????????????if (result.d > 0) { 93 ????????????????????????????$("#userloginsucced").hide(); 94 ????????????????????????????$("#userloginbox").show(); 95 ????????????????????????} 96 ????????????????????} 97 ????????????????}); 98 ?99 ????????????}); //登录框处理结束100 101 ????????});102 ????????</script>Jquery ajax调用webservice总结
原文地址：http://www.cnblogs.com/liujianshe1990-/p/7635151.html