Testing properties with reflection using attributes

Question

I'm trying to create a nUnit test to do the following:

1) Load the DLL to test.
2) Iterate among the various types.
3) Find the ones that have a certain custom attribute.
4) Instantiate these types and make sure that all their public properties aren't null.

Here's what I wrote so far:

Assembly assembly = Assembly.LoadFile("MyLib.dll");  
foreach (Type type in assembly.GetTypes()) {  
    if (type.GetCustomAttributes(typeof(CustomAttribute), false).Length != 0) {  
        Object instance = Activator.CreateInstance(type);  
        foreach (PropertyInfo propertyInfo in type.GetProperties()) {  
            // how to go on from here?
        }  
    }  
}

As you can see I don't know how to finish by testing for nulls, assuming that the rest of the code is correct.

Brian Mains · Accepted Answer · 2010-01-22 11:31:18Z

2

Gettingn the value works this way:

object value = propertyInfo.GetValue(instance, null);

if (value == null)
   //Null value
else if (DBNull.Value.Equals(value))
   //DB Null

answered Jan 22, 2010 at 11:31

Brian Mains

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2 Comments

Florian Doyon Over a year ago

+1 - you might also want to add exception handling in your GetValue call as the callee might implement a custom getter that could yield an exception.

RobSullivan Over a year ago

It worked perfectly, thanks. If anyone else needs this note that there's an error in the code I posted with the question. To check for the custom attribute I had to iterate between all the attributes to find the one I was looking for.

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