Question

I have this class as parent class:

public partial class GetStuffResult
{

    private int _Id;

    private string _Name;

    public GetStuffResult()
    {
    }

    [Column(Storage="_Id", DbType="INT NOT NULL")]
    public int Id
    {
        get
        {
            return this._Id;
        }
        set
        {
            if ((this._Id != value))
            {
                this._Id = value;
            }
        }
    }

    [Column(Storage="_Name", DbType="NVarChar(100)")]
    public string Name
    {
        get
        {
            return this._Name;
        }
        set
        {
            if ((this._Name != value))
            {
                this._Name = value;
            }
        }
    }
}

This is base class which has same methods with exception of an extra method:

public partial class GetStuffResult1
{
    private int _Score;

    private int _Id;

    private string _Name;

    public GetStuffResult1()
    {
    }

    [Column(Storage="_Score", DbType="INT NOT NULL")]
    public int Id
    {
        get
        {
            return this._Score;
        }
        set
        {
            if ((this._Score != value))
            {
                this._Score = value;
            }
        }
    }

    [Column(Storage="_Id", DbType="INT NOT NULL")]
    public int Id
    {
        get
        {
            return this._Id;
        }
        set
        {
            if ((this._Id != value))
            {
                this._Id = value;
            }
        }
    }

    [Column(Storage="_Name", DbType="NVarChar(100)")]
    public string Name
    {
        get
        {
            return this._Name;
        }
        set
        {
            if ((this._Name != value))
            {
                this._Name = value;
            }
        }
    }
}

I have done inheritance before but i am totally confused how it will work in this scenario? How can i inherit GetStuffResult so that i can use its 2 methods and dont have to copy paste same code twice in GetStuffResult1.
Will appreciate if someone can give example with code as i am new to .net 3.5 and still trying to learn it.

Answer 1

I am not sure if I correctly understood your question. (Your current code for GetStuffResult1 shouldn’t compile as you have define Id property twice.) If you are looking to inherit from GetStuffResult then this would do (See Inheritance):

public partial class GetStuffResult1 : GetStuffResult
    {
        private int _Score;  

        public GetStuffResult1()
        {
        }

        [Column(Storage = "_Score", DbType = "INT NOT NULL")]
        public int Id
        {
            get
            {
                return this._Score;
            }
            set
            {
                if ((this._Score != value))
                {
                    this._Score = value;
                }
            }
        }


    }

Notice that I have removed _Id and _Name from the child class. This however will give you warning that:

GetStuffResult1.Id’ hides inherited member
‘ThreadConsoleApp.GetStuffResult.Id’. Use the new keyword if hiding
was intended.

The second thing I am thinking about your question if you are confused about using partial classes and you may need a single class in multiple source file. In that case you may use partial keyword. If that is the case and you don’t need inheritance then you need to use a single name for the class. e.g. GetStuffResult. In that particular case your GetStuffResult1 will become:

public partial class GetStuffResult
    {
        private int _Score;  

        public GetStuffResult1()
        {
        }

        [Column(Storage = "_Score", DbType = "INT NOT NULL")]
        public int Id
        {
            get
            {
                return this._Score;
            }
            set
            {
                if ((this._Score != value))
                {
                    this._Score = value;
                }
            }
        }


    }

This will be similar to having a single class with all the combined properties.

Edit:

To access the base class properties in the child class, you may use base keyword.

    base.Id = 0;
    base.Name = "SomeName";

To access the base class properties from the object of GetStuffResult1, see the following example.

    GetStuffResult1 gsr1 = new GetStuffResult1();
    gsr1.Id = 0;
    gsr1.Name = "SomeName";

Here gsr1.Name is from the base class, you may use different name for Id in either base or child class so that it can be more clearer.