object crashing say it is NULL

Question

I've created a class

public partial class Subrank
{
    private System.DateTime startDateField;

    public System.DateTime StartDate
    {
        get
        {
            return this.startDateField;
        }
        set
        {
            this.startDateField = value;
        }
    }
}

im then trying to create an array of this...

Subrank[] pastSubRank = new Subrank[1];
pastSubRank[0].StartDate = DateTime.Parse("2012-05-22");

but pastSubRank[0] is crashing saying it is NULL....why is this?

score 6 · Accepted Answer · answered Aug 21 '17 at 08:16

6

Yes cause you haven't instantiated the class Subrank before accessing it's property.

Subrank[] pastSubRank = new Subrank[1];
pastSubRank[0] = new Subrank();
pastSubRank[0].StartDate = DateTime.Parse("2012-05-22");

answered Aug 21 '17 at 08:16

Rahul

73,987
13
62
116

Thanks for the help – John Aug 21 '17 at 08:26
You can also write 'Enumerable.Repeat(new Subrank(), 1).ToArray()' to initialize an array of objects. – Henry Martens Aug 21 '17 at 08:28
@John, then consider accepting the answer. – Rahul Aug 21 '17 at 08:30
@Rahul Accepted. Thanks again – John Aug 23 '17 at 02:20

score 4 · Answer 2 · answered Aug 21 '17 at 08:18

4

You need to create an object to put in the array before accessing property

        Subrank[] pastSubRank = new Subrank[1];
        pastSubRank[0] = new Subrank();
        pastSubRank[0].StartDate = DateTime.Parse("2012-05-22");

answered Aug 21 '17 at 08:18

Tallon

41
4

score 2 · Answer 3 · answered Aug 21 '17 at 08:20

2

Subrank[] pastSubRank = new Subrank[]
{
    new Subrank() { StartDate = DateTime.Parse("2012-05-22") }
};

answered Aug 21 '17 at 08:20

Rawitas Krungkaew

5,944
1
15
28

object crashing say it is NULL

3 Answers3