如何从 3.5 asmx Web 服务获取 JSON 响应
[英]How to get JSON response from a 3.5 asmx web service
问题描述
I have the following method:
我有以下方法：
using System.Web.Services;
using System.Web.Script.Services;
using System.Web.Script.Serialization;
using Newtonsoft.Json;
using System.Collections;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
//[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]
// [System.Web.Script.Services.ScriptService]
public class Tripadvisor : System.Web.Services.WebService {
public Tripadvisor () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string HotelAvailability(string api)
{
JavaScriptSerializer js = new JavaScriptSerializer();
string json = js.Serialize(api);
//JsonConvert.SerializeObject(api);
return json ;
}
Here i set ResponseFormat attribute is json s still being returned as XML.在这里，我设置 ResponseFormat 属性是 json 仍然作为 XML 返回。
I want to json format using this asmx service Any ideas?我想使用这个 asmx 服务进行 json 格式有什么想法吗？
4 个解决方案
解决方案1
52 已采纳 2013-10-24 10:57:49
I faced the same issue, and included the below code to get it work.我遇到了同样的问题，并包含以下代码以使其正常工作。
[WebMethod]
[ScriptMethod(UseHttpGet=true ,ResponseFormat = ResponseFormat.Json)]
public void HelloWorld()
{
Context.Response.Clear();
Context.Response.ContentType = "application/json";
Context.Response.Write("Hello World");
//return "Hello World";
}
Update:更新：
To get a pure json format, you can use javascript serializer like below.要获得纯 json 格式，您可以使用如下所示的 javascript 序列化程序。
public class WebService1 : System.Web.Services.WebService
{
[WebMethod]
[ScriptMethod(UseHttpGet=true ,ResponseFormat = ResponseFormat.Json)]
public void HelloWorld()
{
JavaScriptSerializer js = new JavaScriptSerializer();
Context.Response.Clear();
Context.Response.ContentType = "application/json";
HelloWorldData data = new HelloWorldData();
data.Message = "HelloWorld";
Context.Response.Write(js.Serialize(data));
}
}
public class HelloWorldData
{
public String Message;
}
However this works for complex types, but string does not show any difference.然而，这适用于复杂类型，但 string 没有显示任何区别。
解决方案2
2 2018-02-21 11:56:06
Dear future readers: The currently accepted answer is not the right way.亲爱的未来读者：目前接受的答案不是正确的方法。 It ties you to using the JavaScriptSerializer and you lose the ability to request xml (or indeed any serialization format which may come along in the future).它将您与使用JavaScriptSerializer联系起来，并且您将失去请求 xml（或将来可能出现的任何序列化格式）的能力。 The "right way" also involves less code! “正确的方式”还涉及更少的代码！
If you decorate your service class with the [ScriptService] attribute - which you have - then ASP.NET 3.5+ should automatically serialise the response to JSON provided your Ajax call requests JSON .如果您使用[ScriptService]属性装饰您的服务类（您拥有），那么ASP.NET 3.5+ 应自动将响应序列化为 JSON，前提是您的Ajax 调用请求 JSON 。 The suggestions to serialise to JSON manually are simply wrong, unless you wish to use a different serialiser such as Newtonsoft.手动序列化为 JSON 的建议是完全错误的，除非您希望使用不同的序列化程序，例如 Newtonsoft。
That you were seeing XML suggests one of the following:您看到的 XML 表明以下情况之一：
- You are not requesting JSON in your Ajax call - please see working example code below您没有在 Ajax 调用中请求 JSON - 请参阅下面的工作示例代码
- Possibly some web.config entries are missing, according to an answer here (disclaimer: I don't have most of these in a production web.config; only start playing with these if nothing else works)根据这里的答案，可能缺少一些 web.config 条目（免责声明：我在生产 web.config 中没有这些条目；只有在没有其他工作的情况下才开始使用这些条目）
Here is a simple working example of a JSON enabled ASMX web service:这是启用 JSON 的 ASMX Web 服务的简单工作示例：
<%@ WebService Language="C#" Class="WebService" %>
using System;
using System.Collections.Generic;
using System.Web.Services;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService {
[WebMethod]
public MyClass Example()
{
return new MyClass();
}
public class MyClass
{
public string Message { get { return "Hi"; } }
public int Number { get { return 123; } }
public List<string> List { get { return new List<string> { "Item1", "Item2", "Item3" }; } }
}
}
JavaScript to request it and process the response (we'll simply pop up a JS alert with the message from MyClass.Message) : JavaScript 来请求它并处理响应（我们将简单地弹出一个带有来自 MyClass.Message 的消息的 JS 警报）：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Test</title>
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.4.js" type="text/javascript"></script>
</head>
<body>
<script type="text/javascript">
$.ajax({
type: "POST",
url: "WebService.asmx/Example",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: "{ }",
error: function (XMLHttpRequest, textStatus, errorThrown) { alert(langError + " " + textStatus); },
success: function (msg) {
alert(msg.d.Message);
}
});
</script>
</body>
</html>
Http request: Http请求：
POST http://HOST.com/WebService.asmx/Example HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/json; charset=utf-8
X-Requested-With: XMLHttpRequest
Referer: http://HOST.com/Test.aspx
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
Connection: Keep-Alive
Content-Length: 3
Host: HOST.com
{ }
HTTP response: HTTP响应：
HTTP/1.1 200 OK
Cache-Control: private, max-age=0
Content-Type: application/json; charset=utf-8
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Tue, 20 Feb 2018 08:36:12 GMT
Content-Length: 98
{"d":{"__type":"WebService+MyClass","Message":"Hi","Number":123,"List":["Item1","Item2","Item3"]}}
Result:结果：
"Hi" is displayed in a JS popup. “嗨”显示在 JS 弹出窗口中。
解决方案3
1 2013-12-18 11:52:16
Just a doubt.只是一个疑问。 When are you not getting a JSON response?你什么时候没有收到 JSON 响应？ Because when you invoke the web service from the client (I am assuming a web browser, ie xhr), you should specify the content type header on the request as "application/json; charset=yourcharset".因为当您从客户端调用 Web 服务时（我假设是一个 Web 浏览器，即 xhr），您应该将请求中的内容类型标头指定为“application/json; charset=yourcharset”。
I believe the above solution always returns json, no matter what the content type is specified from the client.我相信上述解决方案总是返回 json，无论客户端指定的内容类型是什么。 The dotnet asmx framework allows this using the content-type header method, so the above could be classified as a hack, when a neat solution is available. dotnet asmx 框架允许使用内容类型标头方法进行此操作，因此当有简洁的解决方案可用时，上述内容可归类为黑客攻击。
Similar question at Return Json Data from ASMX web service 从 ASMX Web 服务返回 Json 数据的类似问题
This might help too -> http://forums.asp.net/p/1054378/2338982.aspx#2338982这也可能有帮助-> http://forums.asp.net/p/1054378/2338982.aspx#2338982
PS: I am assuming you are using dotnet version 4. PS：我假设您使用的是 dotnet 版本 4。
解决方案4
0 2020-10-13 14:18:07
Sometimes we don't have access to make changes in WebService definition and sometimes we should not make changes in WebServices!有时我们无权在 WebService 定义中进行更改，有时我们不应该在 WebServices 中进行更改！ so the best solution is set contentType="application/json; charset=..." in your request.所以最好的解决方案是在您的请求中设置contentType="application/json; charset=..." 。 just this!只是这个！
For example you can use below code (if you are using jquery) instead of changing somethings in WebService:例如，您可以使用以下代码（如果您使用的是 jquery）而不是更改 WebService 中的某些内容：
$.ajax({
type: "POST",
url: '/ServiceName.asmx/WebMethodName',
date: {},
contentType: "application/json; charset=utf-8",
success: function (data) {
// Some code;
}
});
Then you can use JSON.parse(data.d) to access json structure of your data.然后您可以使用JSON.parse(data.d)来访问数据的 json 结构。
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