jquery ajax調用webservice(C#)要注意的幾個事項：

1、web.config里需要配置2個地方

<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>之間加入

<webServices>   <protocols>    <add name="HttpPost" />    <add name="HttpGet" />   </protocols>  </webServices>

2.正確地編寫webserivce的代碼

/// <summary>  /// UserValidate 的摘要說明  /// </summary>  [WebService(Namespace = "http://tempuri.org/")]  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]  [System.ComponentModel.ToolboxItem(false)]  // 若要允許使用 ASP.NET AJAX 從腳本中調用此 Web 服務，請取消對下行的注釋。   [System.Web.Script.Services.ScriptService]  public class UserValidate : System.Web.Services.WebService  {    DFHon.Content.Common.rootPublic rp = new DFHon.Content.Common.rootPublic();    [WebMethod]    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]    public string ValidateUserLogState()    {      string result = "";      HttpCookie cookie = HttpContext.Current.Request.Cookies["DHFonMenberInfo"];      if (cookie != null)      {        string username = System.Web.HttpUtility.UrlDecode(cookie["MenberName"]);        int ipoint = 0;        int gpoint = 0;        try        {          DataTable dt = UserBll.ExecuteUserAllInfo(username);          if (dt.Rows.Count > 0)          {            ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString());            gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString());          }        }        catch        { }        result = "{'user':{'id':'" + cookie["UserId"] + "','name':'" + username + "','message':'" + rp.getUserMsg(DFHon.Global.CurrentCookie.UserName) + "','ipoint':'" + ipoint.ToString() + "','gpoint':'" + gpoint.ToString() + "'}}";      }      else      {        result = "{'user':{'id':'0','name':'','message':'0','ipoint':'0','gpoint':'0'}}";      }      return result;    }    [WebMethod]    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]    public string UserLogin(string userName, string userPwd)    {      string returnVal = "";      try      {        GlobalUserInfo info;        DFHon.Content.UserLogin _UserLogin = new DFHon.Content.UserLogin();        EnumLoginState state = _UserLogin.PersonLogin(HttpUtility.UrlDecode(userName), userPwd, out info);        if (state == EnumLoginState.Succeed)        {          DFHon.Global.CurrentCookie.Set(info);          DFHon.API.PDO.DiscuzNT.PassportLogin.UserLogin(Server.UrlDecode(userName), userPwd, -1);          int ipoint = 0;          int gpoint = 0;          DataTable dt = UserBll.ExecuteUserAllInfo(userName);          if (dt.Rows.Count > 0)          {            ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString());            gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString());          }          returnVal = "{'user':{'id':'" + info.UserId.ToString() + "','name':'" + info.UserName + "','message':'" + rp.getUserMsg(userName) + "','ipoint':'" + ipoint.ToString() + "','gpoint':'" + gpoint.ToString() + "'}}";        }        else        {          int ids = 0;//狀態：-2用戶被鎖定 -1用戶名密碼錯誤          switch (state)          {            case EnumLoginState.Err_Locked:              ids = -2;              break;            case EnumLoginState.Err_UserNameOrPwdError:              ids = -1;              break;            default:              break;          }          returnVal = "{'user':{'id':'" + ids + "','name':'','message':'0','ipoint':'0','gpoint':'0'}}";        }      }      catch      {        returnVal = "{'user':{'id':'0','name':'','message':'0','ipoint':'0','gpoint':'0'}}";      }      return returnVal;    }    [WebMethod]    public string UserLogout()    {      if (HttpContext.Current.Request.Cookies["DHFonMenberInfo"] != null)      {        HttpCookie cookie = new HttpCookie("DHFonMenberInfo");        cookie.Expires = System.DateTime.Now.AddDays(-1);        cookie.Domain = DFHon.Config.BaseConfig.getV("weblogin");        HttpContext.Current.Response.AppendCookie(cookie);      }      return "1";    }    DFHon.Content.user UserBll = new DFHon.Content.user();    [WebMethod]    public string ValidateUserEmail(string email)    {      string result = "0";//返回的結果 -2郵箱為空 -1郵箱格式不正確 0郵箱存在 1填寫正確      if (string.IsNullOrEmpty(email))      {        result = "-2";//郵箱為空      }      else if (!IsValidEmail(email))      {        result = "-1";//郵箱格式不正確      }      else if (UserBll.sel_useremail(email) > 0)      {        result = "0";//郵箱存在      }      else      {        result = "1";//可以注冊      }      return result;    }    [WebMethod]    public string ValidateUserName(string username)    {      string result = "0";//返回值：-1用戶名長度為2-16;0用戶名存在;1可以注冊      if (username == "" || username == null || username.Length < 2 || username.Length > 16)      {        result = "-1";      }      else if (UserBll.sel_username(username) != 0)      {        result = "0";      }      else      {        result = "1";      }      return result;    }    public bool IsValidEmail(string strIn)    { // Return true if strIn is in valid e-mail format.       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})(/]?)$");    }  }