Asp – Dynamically adding user controls registered in web.config

asp.net

I'm working on a project that has all its user controls registered in its web.config file (which seems very clean and tidy)

So far so good (here comes the problem) however I'm trying to dynamically create and add user controls to a page. These user controls fire events that need handling.

Ordinarily that wouldn't be a problem:
You just register the control in the page, load the control, cast it to the correct type, and assign the event handlers, add it to the page, sit back and let the magic happen, easy peasy.

But I can't reference the control's type when the control is registered in the web.config, which means no cast, which means no event handling!

Weirdly you can reference the type if you add the usercontrol to the page at design time!

There must be a way round this (without having to register the control on the page, or add a control at design time), what on earth am I missing?

Best Answer

It's been a while, but I think I've seen this type of behavior in ASP.NET when a project is a Web Site and not the Web Application. As far as I remember, the Web Site compiles each page into its own assembly and with no common name space and regardless of config requires the <%@ Register %> directive. If you don't, you get the exact error of missing an assembly reference.

I would have to test to be sure...

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R – Visual Studio 2008 user controls registered in the web.config not registering with intellisense

Whilst this doesn't work in a local Web.Config file you can use the Location tag in your root web.config file to achieve the same result.

For example:

<?xml version="1.0"?>
<configuration>
    <location path="MyPath">
        <system.web>
            <pages>
                <controls>
                    <add src="~/CommonControls/Foo.ascx" tagName="Foo" tagPrefix="Bar"/>
                </controls>
            </pages>
        </system.web>
    </location>
</configuration>

Json – set an unlimited length for maxJsonLength in web.config

NOTE: this answer applies only to Web services, if you are returning JSON from a Controller method, make sure you read this SO answer below as well: https://stackoverflow.com/a/7207539/1246870

The MaxJsonLength property cannot be unlimited, is an integer property that defaults to 102400 (100k).

You can set the MaxJsonLength property on your web.config:

<configuration> 
   <system.web.extensions>
       <scripting>
           <webServices>
               <jsonSerialization maxJsonLength="50000000"/>
           </webServices>
       </scripting>
   </system.web.extensions>
</configuration>

Best Answer

Related Solutions

R – Visual Studio 2008 user controls registered in the web.config not registering with intellisense

Json – set an unlimited length for maxJsonLength in web.config

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