Application Fauled to Initialize (0xc000007b) - C# Discussion Boards

J4amieC6-Oct-10 22:57

J4amieC

6-Oct-10 22:57

You've not instantiated the List anywhere. This has nothing to do with it being inside a struct - the same would have happened if your list was inside a class.

You can fix this by first creating the List.

testStruct aTestStruct = new testStruct();
aTestStruct.sList = new List<string>();
aTestStruct.sList.Add("test");

However, a few pointers

0.1) Naming convention for C# would instruct that your property is called List instead of sList.
0.2) Be careful using structs, they have some hard to understand facets - if in doubt use a class.
0.3) Strictly speaking, a List should generally not be exposed by a public property. Consider whether the struct/class should instead expose just the interface, such as an Add method to add to an internal List.

DaveyM697-Oct-10 0:11

DaveyM69

7-Oct-10 0:11

structs are meant for small value types. Both List<T> and string are reference types, and their size could potentially be very large, so I would never use them inside a struct.

Dave

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harold aptroot7-Oct-10 0:39

harold aptroot

7-Oct-10 0:39

But since they are reference types, the struct would only contain the reference..

"The actual thing" is included in the struct if it's marked ByValArray or ByValTStr or when it is a fixed size buffer[^] (I've never actually seen one of those)

DaveyM697-Oct-10 7:02

DaveyM69

7-Oct-10 7:02

True, I hadn't actually considered that!
I still don't like it due to the mutability implied by using a reference type inside a struct, especially with List<T> as the contents would be mutable even if the exposed list wasn't. A ReadOnlyCollection<T> would be OK I suppose, something like this wrapper...

public struct ExampleStruct
{
    private List<string> list;

    public ExampleStruct(IEnumerable<string> strings)
    {
        if (strings == null)
            list = null;
        else
            list = new List<string>(strings);
    }

    public ReadOnlyCollection<string> List
    {
        get
        {
            if (list == null)
                return null;
            return list.AsReadOnly();
        }
    }
}

harold aptroot7-Oct-10 7:05

harold aptroot

7-Oct-10 7:05

A field in a struct is mutable though, so I'm not sure what you mean..?

Application Fauled to Initialize (0xc000007b)

DaveyM697-Oct-10 7:14

DaveyM69

7-Oct-10 7:14

Of course, but they are generally exposed only by a read-only property. It's rare and generally not recommended to have a property with a setter or to expose the field directly in a struct.

Enobong Adahada6-Oct-10 22:12

6-Oct-10 22:12

I have my vs2008 c# project compiled,
when i install on win Vista, it runs fine
but does not run on win XP SP2.
please can some help me out.
thanks alot.

Sauro Viti6-Oct-10 22:26

Sauro Viti

6-Oct-10 22:26

Is installed on your Windows XP system the version of the .NET Framework that your application is expecting?

Enobong Adahada7-Oct-10 3:12

7-Oct-10 3:12

I used VS2008 and .net 3.5 for the building of the app
on Win Server 2003 Enterprise Edition.
The .net 3.5 will not install on Win XP sp2, so i rebuild with .net 2.0
and i have installed .net 2.0 on the system

Luc Pattyn7-Oct-10 3:25

Luc Pattyn

7-Oct-10 3:25

If you had a .NET version problem, I'd expect an error 0135.

Error 0x7b may mean: The filename, directory name, or volume label syntax is incorrect.
Could be many things, e.g. you're trying to access one of the special folders (such as Users or "Documents and Settings") without going through the proper channels (Environment.SpecialFolder). Proper try-catch and Exception reporting would take care of the details.

Smile | :)

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Enobong Adahada7-Oct-10 3:53

7-Oct-10 3:53

But the same project when installed on Win Vista does not generate any errors.
thanks.

Enobong Adahada7-Oct-10 4:34

7-Oct-10 4:34

I have found Solution to it,
I formatted my Win XP sys and reinstall the OS.
everything is working fine now.
Thanks to Everyone.