如何解决ASP.NET MVC 3中javaScriptSerializer中超过maxJsonLength的异常

Question

我正试图在我的控制器中POST一个Json字符串，该字符串包含9K行，我正在使用TryUpdateModel用Json字符串更新模型，但收到了以下错误：

InvalidOperationException异常：序列化或使用JSON JavaScriptSerializer进行反序列化。字符串超过值

我使用的是MVC 3。我已经尝试在web.config文件中配置json请求的最大长度，但仍然无法工作。有人能帮忙吗？

Answer 1

尝试在web.config中设置JavaScriptSerializer的maxJsonLength，检查以下细微差别：

• maxJsonLength表示字符串中UTF-8字符的最大数目
• maxJsonLength为int32，因此最大值为+2.147.483.647

即：(根据需要更改程序集版本和PublicKeyToken(

<configSections>
<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
<sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="Everywhere" />
<section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" />
<section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" />
</sectionGroup>
</sectionGroup>
</sectionGroup>
</configSections>
<configuration>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="5000"/> 
</webServices>
</scripting>
</system.web.extensions>
</configuration>

您也可以使用自定义转换器：

<configuration>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="50"/>
<converters>
<add name="MyCustomConverter" 
type="MyCompany.ConvertersNameSpace.MyTypeConverter"/>
</converters>
</jsonSerialization>
</webServices>
</scripting>
</system.web.extensions>
</configuration>

我推荐你Json.NET或Jil

Microsoft Docs 中的更多文档

如果您手动使用JavascriptSerializer，web.config将无效。您必须在创建的实例中设置maxJsonLength：

var js = new JavaScriptSerializer() { MaxJsonLength = int.MaxValue };

如果什么都不起作用，也许你可以使用自己的ValueProviderFactory：

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