我正在使用.Net framework 2.0 / jQuery對2.0 Web服務進行Ajax調(diào)用。無論我在ajax調(diào)用中將contentType設置為什么，該服務始終返回XML。我希望它返回Json！這里是電話：      $(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);            }          });        });    這是Fiddler中的請求標頭的樣子：POST /DonationsService.asmx/GetDate HTTP/1.1x-requested-with: XMLHttpRequestAccept-Language: en-usReferer: http://localhost:1238/text.htmAccept: application/json, text/javascript, */*Content-Type: application/json; charset=utf-8Accept-Encoding: gzip, deflateUser-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:1238Content-Length: 2Connection: Keep-AlivePragma: no-cache我嘗試將contentType設置為'text / json'并獲得相同的結(jié)果。這是Web服務方法：<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("DateTime")            .WriteValue(DateTime.Now.ToString)            .WriteEndObject()        End With        strOut = sw.ToString    End Using    Return strOutEnd Function這是它返回的內(nèi)容：<?xml version="1.0" encoding="utf-8"?><string xmlns="http://DMS.Webservices.org/">{"DateTime":"11/13/2008 6:04:22 PM"}</string>有人知道我要Json時如何強制Web服務返回Json嗎？請不要告訴我升級到.Net Framework 3.5或類似的東西（我不是那么愚蠢）。我需要一個2.0解決方案。