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AnswerRe: CsvHelper, EBay Order Csv file, not sure how to handle header with quotes and first line of commas Pin
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AnswerRe: CsvHelper, EBay Order Csv file, not sure how to handle header with quotes and first line of commas Pin
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QuestionConnect POST server call with HttpListener C# Pin
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QuestionInheritance problem Pin
Croccodillo19711-Sep-20 5:22
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AnswerRe: Inheritance problem Pin
Richard Deeming1-Sep-20 7:26
mveRichard Deeming1-Sep-20 7:26 
Members declared with new will not be visible to the base class. When code in the base class looks for the Data member, it will use its own member, not the "shadowed" member declared by the derived class.

Members which are meant to be overridden in a derived class must be marked as virtual, and overridden properly in the derived class.

Knowing When to Use Override and New Keywords - C# Programming Guide | Microsoft Docs[^]

However, a nested class cannot be marked as "virtual". Instead, you will need to inherit from it. You will also need to use a constructor to overwrite the default field values.
C#
public class BaseClass
{
    public class Data
    {
        public int data1 = 1;
        public int data2 = 1;
        public string data3 = "BaseString";
    }
    
    public Data Value { get; }
    
    public BaseClass()
    {
        Value = new Data();
    }
}

public class DerivedClass : BaseClass
{
    public class DerivedData : BaseClass.Data
    {
        public int data4 = 2;
        
        public DerivedData()
        {
            data1 = 2;
            data2 = 2;
            data3 = "DerivedString";
        }
    }
    
    public DerivedClass()
    {
        Value = new DerivedData();
    }
}




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GeneralRe: Inheritance problem Pin
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QuestionHow to reliably exit Outlook using Interop.Outlook? Pin
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Questionfind TIMES in string of text Pin
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AnswerRe: find TIMES in string of text Pin
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GeneralRe: find TIMES in string of text Pin
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