当本地webservice调用时，JSON响应返回null [英] JSON response returning null when local webservice called

问题描述

大家好，



我在asp.net上做了一个简单的web服务，我的service.asmx文件包含webmethod：

Hello everyone,

I have made a simple webservice in asp.net, my service.asmx file contains webmethod as :

[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public void HelloWorld() {
      JavaScriptSerializer serializer = new JavaScriptSerializer();
        string jsonData = serializer.Serialize("Hello World");
        Context.Response.ContentType = "application/json; charset=utf-8";
        Context.Response.Write(jsonData);
        //return jsonData;
}

这个webservice返回Hello World的输出



现在我已经在IIS上托管了这个web服务从localhost访问这个web服务也很好。



现在我在asp.net中创建了一个网站，其中有一个按钮通过AJAX和JSON调用这个web服务



代码为：

This webservice returns me output of "Hello World"

Now i have hosted this webservice on IIS and accessing this webservice from localhost also works very fine.

Now i have created one website in asp.net in which there is a button which invokes this webservice through AJAX and JSON

The code is :

      function invokeService() {

          $.ajax({
              url: "http://localhost/SampleService/Service.asmx/HelloWorld",
              type: "POST",
              contentType: "application/json; charset=utf-8",
              dataType: "json",
              success: function (msg) {
                  alert(msg);
              },
              error: function () {
                  alert("this error");
              }
          });
          return false;
      }
<input type="button" id="btnInvokeService" value="Invoke Service" onclick ="invokeService();" />

现在调用invokeService方法的jSON，但我返回的输出是null值..



我也尝试用返回的字符串值更改webservice webmethod，但最终结果是一样的。



请帮助我如何实现输出JSON提醒为Hello world ..请帮帮我



提前感谢您。



Krunal

Now the invokeService method is called of jSON but the output i am returning is "null" value..

I have also tried to change webservice webmethod with returning string value but the end result is same.

Please help me how can i achieve output in JSON alert as Hello world.. Please help me

Thanking you in advance.

Krunal

推荐答案

.ajax（{
url：http：//localhost/SampleService/Service.asmx/HelloWorld，
类型：POST ，
contentType：application / json; charset = utf-8，
dataType：json，
success：function（msg）{
alert（msg）;
}，
错误：function（）{
alert（this error）;
}
}）;
返回false;
}
< input type =buttonid =btnInvokeServicevalue =Invoke Serviceonclick =invokeService（）; />

.ajax({ url: "http://localhost/SampleService/Service.asmx/HelloWorld", type: "POST", contentType: "application/json; charset=utf-8", dataType: "json", success: function (msg) { alert(msg); }, error: function () { alert("this error"); } }); return false; } <input type="button" id="btnInvokeService" value="Invoke Service" onclick ="invokeService();" />

现在调用invokeService方法的jSON，但我返回的输出是null值..



我也尝试用返回的字符串值更改webservice webmethod，但最终结果是一样的。



请帮助我如何实现输出JSON提醒为Hello world ..请帮帮我



提前感谢您。



Krunal

Now the invokeService method is called of jSON but the output i am returning is "null" value..

I have also tried to change webservice webmethod with returning string value but the end result is same.

Please help me how can i achieve output in JSON alert as Hello world.. Please help me

Thanking you in advance.

Krunal

我建​​议将你的AJAX调用URL更改为：

I would recommend changing your AJAX call URL to this:

url: "Service.asmx/HelloWorld",

发布到IIS时对本地主机的引用不会很好。







将您的服务更改为：

The reference to the local host would not bode well when published to IIS.



Change your service to this:

[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string HelloWorld() {
      JavaScriptSerializer serializer = new JavaScriptSerializer();
        string jsonData = serializer.Serialize("Hello World");
        Context.Response.ContentType = "application/json; charset=utf-8";
        Context.Response.Write(jsonData);
        return jsonData;
}

这篇关于当本地webservice调用时，JSON响应返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！