的WebMethod - JSON序列化错误 [英] WebMethod - JSON Serialization Error

问题描述

我想提出一个jQuery AJAX调用在aspx.cs页后端的WebMethod。我收到的.NET JSON序列化的错误。因此，我在寻找各种方法来解决任何错误或避免使用JSON（为的WebMethods只返回格式）：

I am making a jQuery AJAX call to a back-end WebMethod in an aspx.cs page. I am getting an error in the .NET JSON serialization. As such, I am looking for ways to either fix the error or avoid using JSON (the only return format for WebMethods):

使用JSON JavaScriptSerializer序列化和反序列化过程中的错误。字符串的长度超过上maxJsonLength属性设置的值

相关联的堆栈跟踪是： 在System.Web.Script.Serialization.JavaScriptSerializer.Serialize（obj对象，StringBuilder的输出，SerializationFormat serializationFormat）\ r \ n将在System.Web.Script.Services.RestHandler.InvokeMethod（HttpContext的背景下，WebServiceMethodData methodData ，IDictionary'2 rawParams）\ r \ n将在System.Web.Script.Services.RestHandler.ExecuteWebServiceCall（HttpContext的背景下，WebServiceMethodData methodData）

The associated StackTrace is : at System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, StringBuilder output, SerializationFormat serializationFormat)\r\n at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary'2 rawParams)\r\n at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)

后端code是如下（注：结果是，在现实中大概呈现为一个字符串控制的110K）：

The backend code is as follows (note: result is, in actuality about 110k of a control rendered to a string):

[WebMethod]
public static string GetContactListControl()
{
    try
    {
        var result = "Hello World!"
        return result;
    }
    catch (Exception e){
        Logging.LogException(e);
        return "Exception Thrown";
    }
}

和我从来没有碰到抓块，这对我表明，这个问题是我的code之外。

And I am never hitting the catch block, which to me shows that this issue is outside of my code.

我发现涉及改变web.config中插入以下块的修复程序，但它不工作：

I found a fix involving changing the web.config by inserting the following block, but it is not working:

<system.web.extensions>
    <scripting>
       <webServices>
          <jsonSerialization maxJsonLength="123456"></jsonSerialization>
       </webServices>
    </scripting>
</system.web.extensions>

Project是.NET 3.5。

Project is .NET 3.5.

感谢您的任何意见和建议！

Thank you for any ideas and suggestions!

推荐答案

在maxJsonLength财产的配置必须设置在web.config中。为了让被IIS允许这种配置，下面＆LT; sectionGroup＆GT; 必须包含的＆LT内部; configSections＆GT; ：

Configuration of the maxJsonLength property must be setup in the web.config. In order to allow this configuration to be permitted by IIS, the following <sectionGroup> must be included inside of <configSections>:

<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
  <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
    <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
      <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
      <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
      <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
      <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
    </sectionGroup>
  </sectionGroup>
</sectionGroup>

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