WCF AJAX、jQuery-返回的JSON数据为空
我遇到了一个错误,我希望这里有人能帮助我,因为我一直在试图找出什么是错误的,嗯,太久了 好的,我正在使用WCF以及AJAX和jQuery来访问一个名为WCF AJAX、jQuery-返回的JSON数据为空,jquery,ajax,json,wcf,web-services,Jquery,Ajax,Json,Wcf,Web Services,我遇到了一个错误,我希望这里有人能帮助我,因为我一直在试图找出什么是错误的,嗯,太久了 好的,我正在使用WCF以及AJAX和jQuery来访问一个名为Player 这是WCF接口与相关的操作合同 [OperationContract] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json,
Player
这是WCF接口与相关的操作合同
[OperationContract]
[WebInvoke(Method = "POST",
BodyStyle = WebMessageBodyStyle.Wrapped,
RequestFormat = WebMessageFormat.Json,
ResponseFormat = WebMessageFormat.Json,
UriTemplate = "/getplayers")]
[return: MessageParameter(Name = "Players")]
Player[] GetPlayersInTeam(int TeamId);
以下是实际的Rest服务方法:
public Player[] GetPlayersInTeam(int teamId)
{
string connString = ConfigurationManager.ConnectionStrings["conn"].ConnectionString;
SqlConnection conn = new SqlConnection(connString);
try
{
conn.Open();
}
catch
{
}
List<Player> Players = new List<Player>();
string query = "SELECT * FROM Player WHERE TeamId = @TeamId";
SqlCommand command = new SqlCommand(query, conn);
command.Parameters.AddWithValue("@TeamId", teamId);
SqlDataReader reader = command.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
Player player = new Player(teamId, Convert.ToString(reader[2]),
Convert.ToString(reader[3]));
Players.Add(player);
}
return Players.ToArray();
}
return null;
}
}
下面是jQuery Ajax请求:
<script type="text/javascript" language="javascript">
$(document).ready(function () {
var teamId = $.session.get("teamId");
$.ajax({
cache: false,
type: "POST",
url: "RestService.svc/getplayers",
data: '{ "teamId":"' + teamId + '"}',
contentType: "application/json; charset=utf-8",
success: function (json, status, req) {
var JSONReturn = json.Players;
if (JSONReturn != null) {
alert("picked up players");
}
else {
alert("error");
}
},
error: AjaxError
});
(TeamSelection.aspx匿名函数是上面发布的ajax调用。正如您在底部看到的,json显然包含一个名为Players的对象,但等于null
我不明白为什么会这样。我还添加了数据类型,但没有任何效果。我很困惑:(
谢谢在success函数中执行console.log(json),并打开控制台,以便查看json响应。还可以将数据类型设置为json,这样它将自动将json字符串解析为JavaScript对象,或者执行json.parse(json)要在成功函数中获取JavaScript对象,谢谢,我将尝试并报告。您好,控制台日志函数显示json包含来自Player类的玩家列表,但列表设置为null。我不明白为什么会这样。我还添加了数据类型,但没有任何效果。我很困惑:(你能用你的更改更新你的问题吗?你能展示JSON响应是什么样子吗?不必是全部,但足以获得结构
<script type="text/javascript" language="javascript">
$(document).ready(function () {
var teamId = $.session.get("teamId");
$.ajax({
cache: false,
type: "POST",
url: "RestService.svc/getplayers",
data: '{ "teamId":"' + teamId + '"}',
contentType: "application/json; charset=utf-8",
success: function (json, status, req) {
var JSONReturn = json.Players;
if (JSONReturn != null) {
alert("picked up players");
}
else {
alert("error");
}
},
error: AjaxError
});
CONSOLE.LOG
XHR finished loading: "http://localhost:54033/RestService.svc/getplayers". jquery.js:18
send jquery.js:18
b.extend.ajax jquery.js:18
(anonymous function) TeamSelection.aspx:24
c jquery.js:5
p.fireWith jquery.js:5
b.extend.ready jquery.js:5
H jquery.js:5
Object {Players: null}