C# Only set property when value is given

March 21, 2022

I have a class with a full prop and the default value is already set

I was wondering if there was a way of only setting the value of the property if a value with given when crate a new instance of this class?

    public DateTime dStart { get; set; }
    private DateTime _dStop;

    public DateTime dStop
    {
        get { return _dStop; }
        set { _dStop = DateTime.Today; }
    }

    public UserControl1(DateTime dateStart, DateTime dateEnd)
    {
        // 
        InitializeComponent();
    }

Creating an Instance of the class

XtraForm test = new UserControl1(dateStart, optional Property);

>Solution :

Make it nullable, and set it = null in the parameter list. this makes it optional, and all optional parameters must always go at the end of the list.

public DateTime dStart { get; set; }
private DateTime _dStop;

public DateTime dStop
{
    get { return _dStop; }
    set { _dStop = DateTime.Today; }
}

public UserControl1(DateTime dateStart, DateTime? dateEnd = null)
{
    if (dateEnd.HasValue)
        _dStop = dateEnd.Value;
    InitializeComponent();
}

Usage: