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How do you set derived props in addition to base props?

Posted on 2004-09-23
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Last Modified: 2010-04-15
Hi all. I have a BaseClass with some properties that is common to all my class:

class BaseClass
{
  string BaseProperty
  {
    get{...;}
    set{...;}
  }

  protected static BaseClass<not sure if this is correct return type> ParseLine(string CurrentLine)
  {
    BaseClass baseClass = new BaseClass();
    baseClass.BaseProperty = "some value";
    return baseClass;
  }
}

And then a derived class with additional props, and a method that parses a file specific for this class:

class DerivedClass : BaseClass
{
  string SomeOtherProp
  {
    get{...;}
    set{...;}
  }

  public void SetFields(string FileName)
  {
    //Within FileName resides fields that are common to all base classes
    //It also has additional fields specific to this class
    //I need to be able to set the common fields in the base class, but also continue setting props for the derived class
   
    //this would be where I open the file and get the current line
   
    //Next step -- I think
    BaseClass someClass = BaseClass.ParseLine(currentLine);
   
    //NOW I want to be able to set the additional properties in this derived class but still keep the properties that were set in the ParseLine above
    //How the heck do I do it?    
  }
}
0
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Question by:Junoti
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4 Comments
 
LVL 10

Accepted Solution

by:
eternal_21 earned 500 total points
ID: 12138698
I have thrown together a similar structure to what you have described, which demonstrated TWO ways to accomplish this.  You can do it through constructor chaining, or by calling virtual or base methods:

    public static void Main(string[] args)
    {
      DerivedClass dClass = new DerivedClass("BaseProp,DerProp");
     
      Console.WriteLine(dClass.BaseProperty); //"BaseProp"
      Console.WriteLine(dClass.DerivedProperty); //"DerProp"

      dClass.ResetProperties("xProp,yProp");

      Console.WriteLine(dClass.BaseProperty); //"xProp"
      Console.WriteLine(dClass.DerivedProperty); //"yProp"
    }

    abstract class BaseClass
    {
      string baseProperty;
      public string BaseProperty
      {
        get { return baseProperty; }
      }

      protected BaseClass(string propertyString)
      {
        baseProperty = propertyString.Split(',')[0];
      }

      public virtual void ResetProperties(string propertyString)
      {
        baseProperty = propertyString.Split(',')[0];
      }
    }

    class DerivedClass: BaseClass
    {
      string derivedProperty;
      public string DerivedProperty
      {
        get { return derivedProperty; }
      }

      public DerivedClass(string propertyString): base(propertyString)
      {
        derivedProperty = propertyString.Split(',')[1];
      }

      public override void ResetProperties(string propertyString)
      {
        base.ResetProperties(propertyString);
        derivedProperty = propertyString.Split(',')[1];
      }
    }
0
 
LVL 10

Expert Comment

by:123654789987
ID: 12168539
If u want to set the derived properties in addition to the base properties. Then u have to create an instance of the derived class. This will show all the properties - ones of the base cass and that of the derived class
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