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("DateTime")
            .WriteValue(DateTime.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/">{"DateTime":"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。

这对 return JSON from ASMX services in ASP.NET 2.0没有问题。你只需要安装ASP.NET AJAX扩展。

确保将[ScriptService]装饰添加到您的Web服务。这就是指示ASP.NET AJAX框架的服务器端部分为正确形成的请求返回JSON。

此外,如果你在2.0中使用它,你需要在我的例子中删除“.d”。 The “.d” is a security feature that came with 3.5

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