关于c＃：Asmx Web服务如何返回JSON而不是XML？

Asmx web service how to return JSON and not XML?

我的服务方式：

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[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string getDataFromTrainingMaster()
{
List<TrainingMasterDataStruct> results = new DAL().GetDataFromTrainingMaster();
JavaScriptSerializer js = new JavaScriptSerializer();
return js.Serialize(results).ToString();
}

我的.net Web服务返回以XML包装的JSON，如下所示：

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<?xml version="1.0" encoding="UTF-8"?>
<string xmlns="http://tempuri.org/"> [{"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}]</string>

我怎样才能做到这一点？

相关讨论

无需自己创建JSON字符串。返回List并让.NET即时为您序列化：

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[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public List<TrainingMasterDataStruct> getDataFromTrainingMaster()
{
List<TrainingMasterDataStruct> 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：

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[WebService(Namespace ="http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService {

这使它可以返回JSON。一个问题：JSON序列化程序似乎可以比XML序列化更多的类型，因此如果要输出一个或多个，请在此处注意-在此处使用列表和数组而不是集合。

第三，也是非常重要的一点，客户端必须向服务器指示它需要JSON响应。

为了测试和验证这第三点，我建议您按照上述步骤操作，然后使用jQuery从测试网页中调用Web服务并监视Fiddler中的流量。就像是：

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$.ajax({
type:"POST",
url:"WebService.asmx/getDataFromTrainingMaster",
contentType:"application/json; charset=utf-8",
dataType:"json",
data:"",
success: function (msg) { }
});

这是JSON请求/响应的样子-特别注意POST，Accept和Content-Type标头：

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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":

您可以尝试以下方法：

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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。