相关疑难解决方法(0)

为什么这个简单的Web服务拒绝将JSON返回给客户端？

这是我的客户端代码:

        var params = { };
        $.ajax({
            url: "/Services/SessionServices.asmx/HelloWorld",
            type: "POST",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            timeout: 10000,
            data: JSON.stringify(params),
            success: function (response) {
                console.log(response);
            }
        });

和服务:

namespace myproject.frontend.Services
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    [ScriptService]
    public class SessionServices : System.Web.Services.WebService
    {
        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public string HelloWorld()
        {
            return "Hello World";
        }
    }
}

web.config中:

<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
    </system.web>
</configuration>

并回应:

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">Hello World</string>

无论我做什么,响应总是以XML形式返回.如何让Web服务返回Json？

编辑:

这是Fiddler HTTP跟踪: …