Asmx web服务如何返回JSON而不是XML？
我的服务方式：
[WebMethod] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] public string getDataFromTrainingMaster() { List results = new DAL().GetDataFromTrainingMaster(); JavaScriptSerializer js = new JavaScriptSerializer(); return js.Serialize(results).ToString(); } 我的.net Web服务返回包含在XML中的JSON，如下所示：
[{"Training_Code":"1234 ","Training_Duration":"2hrs ","Training_Startdate":"2/14/2013 3:00:00 PM","Training_Enddate":"2/14/2013 5:00:00 PM","Trainer_ID":1,"Training_Location":"B-Wing Training room-4","Comments":"C# training","Keyword":"C#1234","NumberofDays":1},{"Training_Code":"4321 ","Training_Duration":"16 ","Training_Startdate":"2/17/2013 10:30:00 AM","Training_Enddate":"2/17/2013 5:30:00 PM","Trainer_ID":2,"Training_Location":"A-Wing Training Room-6","Comments":"Objective-C","Keyword":"Obj-C4321","NumberofDays":2}]
我需要它采用以下格式：
"Training":[{"Training_Code":"1234 ","Training_Duration":"2hrs ","Training_Startdate":"2/14/2013 3:00:00 PM","Training_Enddate":"2/14/2013 5:00:00 PM","Trainer_ID":1,"Training_Location":"B-Wing Training room-4","Comments":"C# training","Keyword":"C#1234","NumberofDays":1},{"Training_Code":"4321 ","Training_Duration":"16 ","Training_Startdate":"2/17/2013 10:30:00 AM","Training_Enddate":"2/17/2013 5:30:00 PM","Trainer_ID":2,"Training_Location":"A-Wing Training Room-6","Comments":"Objective-C","Keyword":"Obj-C4321","NumberofDays":2}]
我怎样才能做到这一点？
您无需自己创建JSON字符串。 返回List并让.NET在运行时为您串行化：
[WebMethod] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] public List getDataFromTrainingMaster() { List list = doStuff(); return list; }
其次，非静态方法签名表明这是一个asmx文件（页面方法是静态的）。 默认情况下，这些序列化为xml，因此您需要取消注释或将System.Web.Script.Services.ScriptService属性添加到Web服务类：
[WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.Web.Script.Services.ScriptService] public class WebService : System.Web.Services.WebService {
这允许它返回JSON。 一个问题：JSON序列化程序似乎能够序列化比XML更多的类型，所以如果你想输出/或 – 在这里使用Lists和数组而不是集合，请小心。
第三，也是非常重要的是 ，CLIENT必须向服务器指出它需要JSON响应。
为了测试和validation第三点，我建议您按照上述步骤，然后使用jQuery从测试网页调用Web服务并监视Fiddler中的流量。 就像是：
$.ajax({ type: "POST", url: "WebService.asmx/getDataFromTrainingMaster", contentType: "application/json; charset=utf-8", dataType: "json", data: "", success: function (msg) { } });
这就是JSON请求/响应的样子 – 特别注意POST，Accept和Content-Type标头：
POST http://scrubbed/GetVehicles HTTP/1.1 x-requested-with: XMLHttpRequest Accept-Language: en-gb Accept: application/json, text/javascript, */* Content-Type: application/json; charset=utf-8 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E; InfoPath.2) Host: scrubbed Content-Length: 0 Connection: Keep-Alive Pragma: no-cache HTTP/1.1 200 OK Cache-Control: private, max-age=0 Content-Type: application/json; charset=utf-8 Server: Microsoft-IIS/7.5 X-Powered-By: ASP.NET Date: Mon, 04 Oct 2010 10:49:12 GMT Content-Length: 1417 {"d":{"Data":[{"Key":1,"Value":[{"VehicleId":15036,"VehicleAlias":"Whatever","Expiry":"\/Date(1915983035043)\/","Expired":false},{"VehicleId":
尝试将返回类型更改为List并返回“ results ”。 您不需要自己序列化字符串，具有WebMethod属性的ASP.NET将为您处理。
你可以试试这个：
var data = [{"Training_Code":"1234 ","Training_Duration":"2hrs ","Training_Startdate":"2/14/2013 3:00:00 PM","Training_Enddate":"2/14/2013 5:00:00 PM","Trainer_ID":1,"Training_Location":"B-Wing Training room-4","Comments":"C# training","Keyword":"C#1234","NumberofDays":1},{"Training_Code":"4321 ","Training_Duration":"16 ","Training_Startdate":"2/17/2013 10:30:00 AM","Training_Enddate":"2/17/2013 5:30:00 PM","Trainer_ID":2,"Training_Location":"A-Wing Training Room-6","Comments":"Objective-C","Keyword":"Obj-C4321","NumberofDays":2}] var result = JSON.stringify({ Training: data })
result将为您提供所需的输出。