Reflection from Library dll

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I want to use reflection to reveal the values of global from that are set in the calling assembly.

In the calling assembly I have a main module that specifies many global variables used throughout. I also want to be able to use these in the library dll.

The root namespace of the assembly is "ERP_Generic". The name of the main module is "Main".

The main module: (obviously all this is very simplified for illustration purposes)

Module Main
Public MNApplDir As String = "C:\Program\MyAppDir"
End Module

In the library dll, I have a test sub:

VB

Public Sub Test1()
    Dim mParentAssy As Assembly = Assembly.GetEntryAssembly ' the assembly that called this library class
    Dim moduleType As Type = mParentAssy.GetType("ERP_Generic.Main")
    Dim myFields As FieldInfo() = moduleType.GetFields((BindingFlags.Public Or BindingFlags.Instance))
    Dim mFldName As String = myFields(0).Name
    Dim istr As String = myFields(0).GetValue(mParentAssy)
End Sub

When this sub is called and I step through it, the myFields array does not have any members.

I don't know why the module.GetFields can't find the fields.

Posted 4-Jul-14 15:01pm

KevinBrady57

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KevinBrady57 · Accepted Answer · 2014-07-04T15:22:00

I have figured it out. The FieldInfo line has been changed to:

Dim myFields As FieldInfo() = moduleType.GetFields()

And I have added a loop to find the variables I am seeking:

VB

For i As Short = 0 To myFields.Length - 1 Step 1
    If myFields(i).Name = "MNApplDir" Then
        MNApplDir = myFields(i).GetValue(mParentAssy)
    End If
Next i

This works correctly.