I have an MVC3
application running under .NET 4.0
and when I use JavascriptSerializer.Deserialize
I'm getting an error.
Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.
Reading Can I set an unlimited length for maxJsonLength in web.config I put the jsonSerialization maxJsonLength
key in my web.config but it gets ignored. Though I can set the JavaScriptSerializer.MaxJsonLength
property in code and it works fine.
I would like to have the value in the Web.config
rather than code. Here is how I am using JavaScriptSerializer
.
Dim client As New WebClient
...
Dim result = _client.DownloadString("Test")
Dim serializer = New JavaScriptSerializer
Return serializer.Deserialize(Of Foo)(result)
Here is my Web.config
<configuration>
<configSections>
...
</configSections>
<appSettings>
...
</appSettings>
<system.web>
<customErrors mode="On">
<error statusCode="404" redirect="/Http404"/>
<error statusCode="403" redirect="/Http403"/>
<error statusCode="550" redirect="/Http550"/>
</customErrors>
<compilation debug="true" targetFramework="4.0"/>
<pages controlRenderingCompatibilityVersion="4.0">
<namespaces>
<add namespace="System.Web.Helpers"/>
<add namespace="System.Web.Mvc"/>
<add namespace="System.Web.Mvc.Ajax"/>
<add namespace="System.Web.Mvc.Html"/>
<add namespace="System.Web.Routing"/>
<add namespace="System.Web.WebPages"/>
</namespaces>
</pages>
</system.web>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="50000000"/>
</webServices>
</scripting>
</system.web.extensions>
<system.webServer>
....
</system.webServer>
</configuration>
According to the link you provided (the 2nd most voted answer), your web.config setting will be ignored because you're using an internal instance of the JavaScriptSerializer
.
If you need the value to be stored in the web.config, you could add a key in the <appSettings>
section called maxJsonLength
with a value of 50000000
and then in your code, you could use it like:
var serializer = new JavaScriptSerializer();
serializer.MaxJsonLength = ConfigurationManager.AppSettings['maxJsonLength'];