ASP.NET Could not load type 'System.String'

Question

Has anyone ever seen an issue with an ASP.NET websuite blows up on initial login, complaining about a system.string type in the profile that is defined in the web.config.

More Info:

Server Error in '/abc' Application.
--------------------------------------------------------------------------------

Configuration Error 
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. 

Parser Error Message: Attempting to load this property's type resulted in the following error: Could not load type 'System.String'.

Source Error: 


Line 222:           </providers>
Line 223:           <properties>
Line 224:               <add name="FirstName" type="System.String"/>
Line 225:               <add name="LastName" type="System.String"/>
Line 226:               <add name="DriverCode" type="System.String"/>


Source File: d:\Inetpub\wwwroot\abc\web.config    Line: 224 


--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

Jon Skeet · Accepted Answer · 2009-01-23 20:12:36Z

3

I haven't seen that, but the docs say that System.String is the default, so try just removing the type part.

answered Jan 23, 2009 at 20:12

Jon Skeet

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John, thanks for the idea. This application has been deployed a couple of dozen times w/o issue. I did go ahead and try what you said, but it still blows up on the System.Boolean property. Any other thoughts?
– ryanbales
Commented Jan 23, 2009 at 20:32
Sounds like something in the deployment is badly hosed then. Have any service packs been applied, or anything else that would affect the ASP.NET installation?
– Jon Skeet
Commented Jan 23, 2009 at 20:55

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Community · Accepted Answer · 2017-05-23 12:08:38Z

0

Have a look at this Q&A: Using a profile property of type List in .NET Membership

Try to add a fully qualified assembly name, like:
<add name="MyString" type="System.string, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

That made it work for me.

edited May 23, 2017 at 12:08

CommunityBot

11 silver badge

answered Dec 7, 2012 at 14:09

Björn

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One way to get the fully qualified assembly name is to run AssemblyQualifiedName on the type, like this: System.Collections.Specialized.StringCollection sc = new System.Collections.Specialized.StringCollection(); Console.WriteLine(sc.GetType().AssemblyQualifiedName);
– Björn
Commented Feb 1, 2013 at 13:19

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