Question

After installing .NET 4.0, I am now getting an exception on this statement:

 if (mainForm.versionNumber.Contains("BETA"))  

This is how versionNumber is defined:

public static string versionNumber = "1.1.1 " + compileDate.ToString("dd-MMM-yyyy");

and the run-time errorr is “TypeInitializationException”. What changed from .NET v3.5 to 4.0 that would cause this? And how do I fix it?

UPDATE: here is the exception detail:

> System.TypeInitializationException was unhandled   Message=The type
> initializer for 'Media_Inventory_Manager.mainForm' threw an exception.
> Source=PragerMediaInventoryManager  
> TypeName=Media_Inventory_Manager.mainForm   StackTrace:
>        at Media_Inventory_Manager.Prager.Main() in D:\Prager Software\Media Inventory Manager\Program.cs:line 36
>        at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
>        at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
>        at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
>        at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
>        at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
>        at System.Threading.ThreadHelper.ThreadStart()   InnerException: System.FormatException
>        Message=The string was not recognized as a valid DateTime. There is a unknown word starting at index 0.
>        Source=mscorlib
>        StackTrace:
>             at System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles)
>             at System.DateTime.Parse(String s, IFormatProvider provider)
>             at Media_Inventory_Manager.mainForm..cctor() in D:\Prager Software\Media Inventory Manager\Main Form.cs:line 38
>        InnerException:

Answer 1

I think it is something wrong with a class initializer fails to initialize a type. It really hard to see what happens when you are not show that much code. If you read on mdsn it says:

When a class initializer fails to initialize a type, a
TypeInitializationException is created and passed a reference to the
exception thrown by the type’s class initializer. The InnerException
property of TypeInitializationException holds the underlying
exception.

TypeInitializationException uses the HRESULT COR_E_TYPEINITIALIZATION,
that has the value 0x80131534.

For a list of initial property values for an instance of
TypeInitializationException, see the TypeInitializationException
constructors.

Reference here

So knowing that i would look at the InnerException and see whats going on.

EDIT

With out knowing more about your code. This could be a way to get the InnerException

try
{
    mainForm.versionNumber.Contains("BETA");
}
catch(TypeInitializationException ex)
{
    var inner= ex.InnerException;
}