C#: Using reflection to get access to all fields within a class, returns error

Question

can anyone help me?

I have some reflection code that i have written and it seems to work well but it gives me an error when trying to pass in "this" to the GetValue.

I am a little stuck, i think the problem is that i am running the reflection code in frmMain adn the AbCCompany is defined in another project but i have a reference.

I get the error

Field 'AbcCompany' defined on type 'MyApp.Companies.Config' is not a field on the target object which is of type 'MyApp.frmMain'.

Here is the code..

        var companies = MyIems.Companies.GetType().GetFields();


        foreach (var list in companies )
        {

            List<CompanyBase> thisCompanyCollection = (List<CompanyBase>)list.GetValue(this);
            foreach (var company in thisCompanyCollection )
            {
                Console.WriteLine();
            }
        }

EDIT

I forgot to mention that Inside "Companies" is lots of List where xxx is a class.. all classes inherit from CompanyBase. i.e AbcCompany

please show the fields of MyItems.Companies and the declaration of CompanyBase. — Yahia
– Yahia, Commented Aug 18, 2011 at 16:16

Wesley Wiser · Accepted Answer · 2011-08-18 16:17:05Z

4

Instead of passing in this to GetValue you need to pass an instance of MyApp.Companies.Config.

If you look at the documentation, you can see that the exception your getting is because the obj parameter isn't of the type (or inherits from it) that the current field is declared on.

Assuming that MyApp.Companies.Config has a parameterless constructor, the following should work:

var type = MyItems.Companies.GetType();

var instance = type.GetConstructor(System.Type.EmptyTypes).Invoke(null);

foreach(var list in type.GetFields())
{
    List<CompanyBase> thisCompanyCollection = (List<CompanyBase>)list.GetValue(instance);
    foreach(var company in thisCompanyCollection)
    {
        Console.WriteLine(company);
    }
}

edited Aug 18, 2011 at 16:17

answered Aug 18, 2011 at 16:06

Wesley Wiser

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1 Comment

Wesley Wiser Over a year ago

The code sample provided says MyItems.Companies.GetType(), GetType is an instance method not a static method so Companies is a variable, MyItems possibly is as well. The exception message states the type name is MyApp.Companies.Config which is what MyItems.Companies is an instance of.

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