CODEWITHSUNDEEP
c#asp.netarraylist
Tom Gullen
Tom Gullen

Reputation: 61727

c# Get object property from ArrayList

Can't figure this one out

I have an ArrayList of classes:

        // Holds an image
        public class productImage
        {
            public int imageID;
            public string imageURL;
            public DateTime dateAdded;
            public string slideTitle;
            public string slideDescrip;
        }

    public ArrayList productImages = new ArrayList();

productImage newImage = new productImage();
newImage.imageID = 123;
productImages.Add(newImage);

Now how do I access the property?

int something = productImages[0].imageID

Doesn't work!

Error 1 'object' does not contain a definition for 'slideTitle' and no extension method 'slideTitle' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

Upvotes: 2

Views: 7253

Answers (3)

Brian Genisio
Brian Genisio

Reputation: 48137

Just to get this code up with modern idioms:

public ArrayList productImages = new ArrayList();

productImage newImage = new productImage();
newImage.imageID = 123;
productImages.Add(newImage);

can be re-written as:

var productImages = new List<ProductImage> { new ProductImage { ImageID = 123 } };

Upvotes: 0

Aliostad
Aliostad

Reputation: 81660

try:

 int something = ((productImage)productImages[0]).imageID;

Needs to be casted from the type object.

Upvotes: 1

JaredPar
JaredPar

Reputation: 754745

The values in an ArrayList are typed to Object. You need to cast to productImage to access the property.

int something = ((productImage)productImages[0]).imageId;

A much better solution though is to used a strongly typed collection like List<T>. You can specify the element type is productImage and avoid the casting altogether. 

public List<productImage> productImages = new List<productImage>();
productImage newImage = new productImage();
newImage.imageID = 123;
productImages.Add(newImage);
int something = productImages[0].imageID;  // Works

Upvotes: 11

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