C# Using a struct

Question

I am using Mono Develop For Android and would like some help with using an array of structs.

Here is my code:

public struct overlayItem
{
    string stringTestString;
    float floatLongitude;
    float floatLatitude;
}

And when using this struct:

overlayItem[1] items;
items[0].stringTestString = "test";
items[0].floatLongitude = 174.813213f;
items[0].floatLatitude = -41.228162f;

items[1].stringTestString = "test1";
items[1].floatLongitude = 170.813213f;
items[1].floatLatitude = -45.228162f;

I am getting the following error at the line:

overlayItem[1] items;

Unexpected symbol 'items'

Can I please have some help to correctly create an array of the above struct and then populate it with data.

Thanks

Have a look at the section on C# structs on the MSDN msdn.microsoft.com/en-us/library/saxz13w4.aspx — Panos Rontogiannis
– Panos Rontogiannis, Commented Nov 14, 2012 at 10:59

Habib · Accepted Answer · 2012-11-14 06:59:24Z

3

Define your struct like:

overlayItem[] items = new overlayItem[2];

Also you need to define your fields in the struct as public, to be able to access them outside the struct

public struct overlayItem
{
    public string stringTestString;
    public float floatLongitude;
    public float floatLatitude;
}

(you may use Pascal case for your structure name)

answered Nov 14, 2012 at 6:59

Habib

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2 Comments

Asif Mushtaq Over a year ago

+1 for adding Pascal Case and pointing to the properties to be public.

supercat Over a year ago

@Asif: Fields, not properties. While there are times when structures should have properties which behave semantically different from fields, if a structure member is going to behave like a public field, it should be a public field.

Dave New · Accepted Answer · 2012-11-14 07:00:55Z

1

You need to create your struct array like so:

overlayItem[] items = new overlayItem[2];

Remember to declare it with [2] as it will have 2 elements, not 1! Indexing an array might start at zero, but defining an array size does not.

answered Nov 14, 2012 at 7:00

Dave New

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Comments

Maarten · Accepted Answer · 2012-11-14 07:01:06Z

1

Your sample code shows you need two items, so you need to declare the array of structs with length 2. This can be done with:

overlayItem[] items = new overlayItem[2];

answered Nov 14, 2012 at 7:01

Maarten

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Comments

Asif Mushtaq · Accepted Answer · 2012-11-14 07:06:26Z

1

The right way to declare the struct array for two elements is

overlayItem[] items = new overlayItem[2];

If you do not know the exact no of items you can also use list.

List<overlayItem> items = new List<overlayItem>();

items.Add( new overlayItem {
               stringTestString = "test";
               floatLongitude = 174.813213f;
               floatLatitude = -41.228162f; 
           }
);

edited Nov 14, 2012 at 7:06

answered Nov 14, 2012 at 7:00

Asif Mushtaq

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