Programmatically Ignore Inherited Properties while iterating through object properties

Question

User1920326549 posted

Hi All,

I'm currently running a loop to iterate through an object properties:

Public Class Notification
    Inherits CommonProp
    Public Property NotificationID As Integer
    Public Property Message As String
    Public Property ReceivedDateTime As DateTime
End Class

However, when iterating through these properties, I do not want to iterate through the inherited CommonProp properties.

Is there anyway of ignoring the CommonProp properties?

Please kindly assist.

Thank you in advance.

Warmest Regards,

leroylll

Answer 1

User1224194097 posted

However, when iterating through these properties, I do not want to iterate through the inherited CommonProp properties.

You can use Reflection and check if the Declaring Type and Reflecting Type are same. 

Public Class ParentClass
    Private m_Name As String
    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property
End Class
Public Class ChildClass
    Inherits ParentClass
    Private m_Number As String
    Public Property Number() As String
        Get
            Return m_Number
        End Get
        Set(ByVal value As String)
            m_Number = value
        End Set
    End Property
End Class


Dim cls As New ChildClass()
cls.Number = "Test Number"
Dim properties = cls.GetType().GetProperties() _
                                .Where(Function(a) a.DeclaringType.Equals(a.ReflectedType)).ToList()
'Get Values here
Dim values = (From a In properties Select a.GetValue(cls, Nothing)).ToArray()

Answer 2

User1920326549 posted

However, when iterating through these properties, I do not want to iterate through the inherited CommonProp properties.

How are you iterating through properties? Are you using Reflection? If so, you can check if the Declaring Type and Reflecting Type are same.

1. Public Class ParentClass  
2.     Private m_Name As String  
3.     Public Property Name() As String  
4.         Get  
5.             Return m_Name  
6.         End Get  
7.         Set(ByVal value As String)  
8.             m_Name = value  
9.         End Set  
10.     End Property  
11. End Class  
12. Public Class ChildClass  
13.     Inherits ParentClass  
14.     Private m_Number As String  
15.     Public Property Number() As String  
16.         Get  
17.             Return m_Number  
18.         End Get  
19.         Set(ByVal value As String)  
20.             m_Number = value  
21.         End Set  
22.     End Property  
23. End Class  

Public Class ParentClass
    Private m_Name As String
    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property
End Class
Public Class ChildClass
    Inherits ParentClass
    Private m_Number As String
    Public Property Number() As String
        Get
            Return m_Number
        End Get
        Set(ByVal value As String)
            m_Number = value
        End Set
    End Property
End Class

1. Dim cls As New ChildClass()  
2.         cls.Number = "Test Number"  
3.         Dim properties = cls.GetType().GetProperties() _  
4.                                 .Where(Function(a) a.DeclaringType.Equals(a.ReflectedType)).ToList()  
5.         'Get Value here  
6.         Dim strNumber = properties.First().GetValue(cls, Nothing)  

Dim cls As New ChildClass()
        cls.Number = "Test Number"
        Dim properties = cls.GetType().GetProperties() _
                                .Where(Function(a) a.DeclaringType.Equals(a.ReflectedType)).ToList()
        'Get Value here
        Dim strNumber = properties.First().GetValue(cls, Nothing)

Correct me if I had understood your requirement wrong.

yup.... im intending to use Reflection to iterate through the properties of the class Notification (without the CommonProp properties) and insert the property values into a paramarrray.

Answer 3

User1224194097 posted

im intending to use Reflection to iterate through the properties of the class Notification (without the CommonProp properties) and insert the property values into a paramarrray.

Did you try my code? 

Answer 4

User1920326549 posted

im intending to use Reflection to iterate through the properties of the class Notification (without the CommonProp properties) and insert the property values into a paramarrray.

Did you try my code? 

Yup... thanks.... it worked.

Answer 5

User1920326549 posted

Just to add on, i found this code on http://snipplr.com/view/4648/add-item-to-array:

// Add an item to the end of an existing array
string[] ar1 = new string[] {"I", "Like", "To"}
 
// create a temporary array with an extra slot
// at the end
string[] ar2 = new string[ar1.Length + 1];
 
// add the contents of the ar1 to ar2
// at position 0
ar1.CopyTo(ar2, 0);
 
// add the desired value
ar2.SetValue("Code.", ar1.Length);
 
// overwrite ar1 with ar2 and voila!
// the contents of ar1 should now be {"I", "Like", "To", "Code."}
ar1 = ar2;

Hope it will be useful to those reading.