我有一个通过我的ASPX网站公开的WCF服务库，如下所示

[System.ServiceModel.OperationContract]
[System.ServiceModel.Web.WebInvoke(
Method= "POST",
RequestFormat=System.ServiceModel.Web. WebMessageFormat .Json,
ResponseFormat=System.ServiceModel.Web.WebMessageFormat .Json)]
LogonResponse Logon(LogonRequest logonRequest);


[System.Runtime.Serialization.DataContract]
[ Serializable()]
public class LogonRequest
{
[System.Runtime.Serialization.DataMember]
public string EMailAddress;
[System.Runtime.Serialization.DataMember]
public string Password;
}

在我的测试页中，我可以通过MS Ajax进行呼叫：-

<asp:ScriptManager ID ="ScriptManager1" runat="server">
<Services>
<asp:ServiceReference Path="~/testService.svc" />
</Services>
</asp:ScriptManager>
.
.
.
function clsLogonRequest(eMailAddress, password) {
this .EMailAddress = eMailAddress;
this .Password = password;
}

function login(eMailAddress, password) {
var LogonRequest = new clsLogonRequest(eMailAddress, password);
name.API.IAPI.Logon(LogonRequest, onSuccess, onFailure);
}

function onSuccess(result) {
$( "#txtSessionId").val(result.SessionId);
$( "#txtUserName").val(result.Name);
$( "#txtUserId").val(result.UserId);
}

效果很好，或通过jQuery $ .ajax调用：-

$(document).ready(function() {
$( "#Button1").click(function() {
var LogonRequest = new clsLogonRequest( '*************' , '***********');
$.ajax({
type: "POST",
url: "testService.svc/Logon",
data: "{'logonRequest':" + JSON.stringify(LogonRequest) + "}" ,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(msg) {
alert(msg.d);
}
});
});
});

哪个不行-在FireBug下，我可以看到500 Internal Server Error消息，并且异常开始

{"ExceptionDetail":{"HelpLink":null,"InnerException":null,"Message":"The token '\"' was expected but found '''.","StackTrace":"   at System.Xml.XmlExceptionHelper.ThrowXmlException(XmlDictionaryReader reader, String res, String arg1, String arg2, String arg3)\u000d\u000a   at System.Xml.XmlExceptionHelper .ThrowTokenExpected(XmlDictionaryReader reader, String expected, Char found)\u000d\u000a   at System.Runtime...

当我明确告诉它不这样做时，为什么看起来jQuery调用正在传递XML（以及如何停止它，以便尽可能自然地处理来自所有来源的调用）？

提前致谢。

编辑：

感谢您的建议，我查看了您的发言，并认为我对该问题的解释不够清楚。

问题不在于没有发送JSON，而是正在发送JSON，并且格式正确，我可以从firebug中看到。问题在于WCF服务库似乎期望XML，并且在接收JSON时掉线。

为了确保我没有忽略建议的解决方案，这里是web.Config摘录-我尝试从行为中删除并从services / service /
endpoint标记中删除behaviorConfiguration属性，但这只会使整个操作失败而不离开页面。

<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name ="MyServiceTypeBehaviors ">
<serviceDebug includeExceptionDetailInFaults="true" />
<serviceMetadata httpGetEnabled="true" />
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name ="AspNetAjaxBehavior">
<enableWebScript/>
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled= "true " />
<services>
<service name ="test.API.API" behaviorConfiguration = " MyServiceTypeBehaviors">
<endpoint behaviorConfiguration="AspNetAjaxBehavior" binding = " webHttpBinding" contract="test.API.IAPI" />
<endpoint contract ="IMetadataExchange" binding= " mexHttpBinding" address="mex" />
</service>
</services>
</system.serviceModel>

提前致谢