jquery – 如何从2.0 asmx web服务返回JSON

我使用.Net框架2.0 / jQuery做一个Ajax调用2.0 Web服务。不管我在ajax调用中设置了contentType，服务总是返回XML。我想让它返回Json！

这里是电话：

$(document).ready(function() {
         $.ajax({
            type: "POST",url: "Donationsservice.asmx/GetDate",data: "{}",contentType: "application/json; charset=utf-8",dataType: "json",success: function(msg) {
              // Hide the fake progress inDicator graphic.
              $('#RSSContent').removeClass('loading');

              // Insert the returned HTML into the <div>.
              $('#RSSContent').html(msg.d);
            }
          });
        });

这里是请求标头在fiddler中的样子：

POST /Donationsservice.asmx/GetDate http/1.1
x-requested-with: XMLhttprequest
Accept-Language: en-us
Referer: http://localhost:1238/text.htm
Accept: application/json,text/javascript,*/*
Content-Type: application/json; charset=utf-8
Accept-Encoding: gzip,deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; eMusic DLM/4; .NET CLR 2.0.50727)
Host: localhost:1238
Content-Length: 2
Connection: Keep-Alive
Pragma: no-cache

我已经尝试将contentType设置为“text / json”并获得相同的结果。

这里是web服务方法：

<WebMethod()> _
Public Function GetDate() As String

    'just playing around with Newtonsoft.Json
    Dim sb As new StringBuilder
    Dim sw As New IO.StringWriter(sb)
    Dim strOut As String = String.Empty

    Using jw As New JsontextWriter(sw)
        With jw
            .WriteStartObject()
            .WritePropertyName("datetiR_649_11845@e")
            .WriteValue(datetiR_649_11845@e.Now.ToString)
            .WriteEndObject()
        End With
        strOut = sw.ToString
    End Using

    Return strOut

End Function

这里是它返回：

<?xml version="1.0" encoding="utf-8"?>
<String xmlns="http://DMs.Webservices.org/">{"datetiR_649_11845@e":"11/13/2008 6:04:22 PM"}</String>

有人知道如何强制Web服务返回Json时，我问Json？

请不要告诉我升级到.Net Framework 3.5或类似的东西(我不是那么蠢)。我需要一个2.0解决方案。