net JSON Webservice响应类型的问题

I am attempting to write an ASP.net web service that will be utilized by a jQuery AJAX call. I am absolutely at my wit's end trying to get this to work. I've seen a number of similar questions online but I haven't been able to find a solution that fits.

我正在尝试编写一个ASP.net web服务，它将被jQuery AJAX调用使用。我实在是绞尽脑汁想把这事办好。我在网上看到过很多类似的问题，但我一直没有找到合适的解决方案。

When I attempt to make the ajax call (via jquery) I get a successful response from the server but the request fails because of a parser error.

当我尝试使用ajax调用(通过jquery)时，我从服务器获得了一个成功的响应，但是由于解析器错误，请求失败了。

I've validated the json returned by the webservice and it is valid. The issue seems to stem from the fact that asp.net is returning the json object as xml.

我已经验证了webservice返回的json，它是有效的。这个问题似乎源于asp.net将json对象作为xml返回的事实。

I've specified the return type as json using

我使用了json指定了返回类型。

<Script.Services.ScriptMethod(responseFormat:=Script.Services.ResponseFormat.Json)> _

I've added the following http handler as it was mentioned as a potential fix

我添加了以下http处理程序，正如前面提到的，它是一个潜在的修复

  <httpHandlers>
      <remove verb="*" path="*.asmx"/>
      <add verb="*" path="*.asmx" type="System.Web.Script.Services.ScriptHandlerFactory" validate="false"/>   
</httpHandlers>

The content Type is set to "application/json; charset=utf-8" and the dataType to "json" in my jquery ajax setup. The request type seems to be correct but the response is always xml.

内容类型设置为“application/json;在jquery ajax设置中，charset=utf-8和“json”的数据类型。请求类型似乎是正确的，但响应始终是xml。

I can make the request successfully by removing the dataType but i would very much like to avoid using an eval to deserialize the data.

我可以通过删除数据类型成功地发出请求，但是我非常希望避免使用eval来反序列化数据。

If anyone has any suggestion i will be greatly appreciated. I've been pulling my hair out for a few days on this.

如果有人有任何建议，我将非常感激。这件事我已经紧张了好几天了。

JAVASCRIPT

(function($) {
$.ajaxSetup({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    global: false,
    dataType: "json"


});

function auto() { console.log("test"); return; };

$.fn.species = {
    test: function() { alert("test"); },
    load: function() { //load and attach species list to element as dropdown
        $.ajax({
            url: "SpeciesService.asmx/List",
            success: function(msg) { console.log(msg); },
            error: function (xhr, desc, exceptionobj) {
                        console.log(xhr.responseText);
                        console.log(desc);
                        console.log(exceptionobj);

            }
        });
                return this;

    }

}; //Species Block

})(jQuery); //jQuery Alias Block

})(jQuery);/ / jQuery别名

ASP.NET Webservice

ASP。网网络服务

<%@ WebService Language="VB" Class="SpeciesService" %>

Imports System.Web Imports System.Web.Services Imports System.Web.Services.Protocols Imports Species Imports System.Runtime.Serialization

导入系统。网络包含进口。System.Web.Services进口服务。协议导入物种的System.Runtime.Serialization

' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. ' _

使用ASP从脚本中调用这个Web服务。NET AJAX，取消注释如下一行。”_

_ _ Public Class SpeciesService

公共类专业服务。

Inherits System.Web.Services.WebService
<WebMethod()> _
<Script.Services.ScriptMethod(responseFormat:=Script.Services.ResponseFormat.Json)> _
Public Function Data(ByVal id As Integer) As String
    Dim curSpecies As New Species(id)
    Return curSpecies.serialize
End Function

<WebMethod()> _
<Script.Services.ScriptMethod(responseFormat:=Script.Services.ResponseFormat.Json)> _
Public Function List() As String

    Return Species.list()
End Function

End Class

结束课

4 个解决方案

#1

Try posting a dummy json data with JQuery like this :

尝试使用JQuery发布一个假json数据:

$.ajaxSetup({
    type: "POST",
    data : "{'foo':'bar'}"
...

#2

This is more hint than an answer - I've been using PageMethods rather than webservices and it works very well. I'd try that if it suffers with the same issue.

这更多的是暗示而不是答案——我使用的是PageMethods而不是webservices，而且效果很好。如果它也有同样的问题，我就试试。

#3

If you watch the headers is there a content-length being sent? IIS requires a content-length on a post, so even adding an empty body to the post might fix it.

如果你看标题，是否有一个内容长度被发送?IIS需要一个post的内容长度，因此即使在post中添加一个空的body，也可能会修复它。

And I think the reason it works with the datatype set to json is that jquery adds an empty post body for you in that case.

我认为它使用json数据类型的原因是jquery为您添加了一个空的post body。

#4

Alright - Thank you guys very much for your help. The lack of dummy data was the core of the problem. When I tried to add it before it caused a server error and I moved on to something else.

好的，非常感谢你们的帮助。缺乏虚拟数据是问题的核心。当我尝试添加它之前，它导致了一个服务器错误，然后我转移到其他东西。

I can't even figure out what fixed the server error portion of the problem. I just spent ten minutes absentmindedly messing with syntax (fixing indents, caps, comments) because i was getting too frustrated to focus on the problem at hand. I refreshed the page and suddenly it is working fine. So the answer was to post dummy data and fix random mystery syntax error.

我甚至不能确定问题的服务器错误部分是什么。我只是心不在焉地花了10分钟来修改语法(修改缩进、大写、注释)，因为我太沮丧了，无法专注于手头的问题。我刷新了页面，突然它工作得很好。所以答案是发布假数据并修复随机的神秘语法错误。

Anyways I can not thank you enough for getting me back on the right track.

无论如何，你让我回到了正确的道路上，我感激不尽。

#1