Question

I recently tried to upgrade a .net 2.0 project which had its DAL generated by SubSonic 2.2 to .NET 4.0 under Visual Studio 2010.

The projects converted without error but now I am getting a rather vile error message when I try to launch it.

System.Security.VerificationException: Operation could destabilize the runtime.  

at SubSonic.DataProvider.ApplyConfig(NameValueCollection config, Boolean& parameterValue, String configName) in C:\Documents and Settings\Desktop\4.0 Production\rel_1.0\server\Server.DAL\Server.DAL.SubSonic\DataProviders\DataProvider.cs:line 955
   at SubSonic.DataProvider.Initialize(String name, NameValueCollection config) in C:\Documents and Settings\Desktop\4.0 Production\rel_1.0\server\Server.DAL\Server.DAL.SubSonic\DataProviders\DataProvider.cs:line 916
   at System.Web.Configuration.ProvidersHelper.InstantiateProvider(ProviderSettings providerSettings, Type providerType)

The code where it is throwing the exception:

    ApplyConfig(config, ref extractClassNameFromSPName, ConfigurationPropertyName.EXTRACT_CLASS_NAME_FROM_SP_NAME);

    private static void ApplyConfig(System.Collections.Specialized.NameValueCollection config, ref bool parameterValue, string configName)
    {
        if(config[configName] != null)
        {
            parameterValue = Convert.ToBoolean(config[configName]);
        }
    }

It performs similar calls to here, the only difference being it is strictly a string and not a boolean it is manipulating.

private static void ApplyConfig(System.Collections.Specialized.NameValueCollection config, ref string parameterValue, string configName)
{
    if(config[configName] != null)
    {
        parameterValue = config[configName];
    }
}

config is defined as a System.Collections.Specialized.NameValueCollection with 3 keys
generateNullableProperties, connectionStringName, generatedNamespace
extractClassNameFromSPName == false

EDIT1: The code that kicks off the error is in the Application_Start() method of the Global.asax

System.Data.SqlClient.SqlDependency.Start(SystemSetting.Schema.Provider.DefaultConnectionString);

EDIT2: The error bubbles out to thowing a targetinvocation error referening my web.config

<SubSonicService defaultProvider="appPlan">
    <providers>
        <clear/>
        <add name="appPlan" type="SubSonic.SqlDataProvider, appPlan.Server.DAL.SubSonic" generateNullableProperties="false" connectionStringName="appPlan" generatedNamespace="appPlan.Server.DAL"/>
    </providers>
</SubSonicService>

has anybody else ever run across such an issue? I could upgrade to SubSonic3.x but it would be a much greater undertaking I believe.

thanks.

Answer 1

Does this fix the problem?

private static void ApplyConfig(System.Collections.Specialized.NameValueCollection config, ref bool parameterValue, string configName)
{
    if(config[configName] != null)
    {
        string val = config[configName];
        parameterValue = Convert.ToBoolean(val);
    }
}

If not, then try

string val = config[configName];
if (val.ToLower() == "false")
    parameterValue = false;
else
    parameterValue = true;

There may be 2 reasons why the original code fails. First, earlier version of .NET (probably 1.1) had some type issue. I don’t know what exactly, but I suspect it might have failed to identify the type of the value passed straight from the NameValueCollection into ToBoolean. The second possibility is that the value is not “true” or “false”, but something else. Again, these 2 may or may not be the reason. I can’t know for sure because I don’t have SubSonic 2.2.