How to iterate over a combobox's items?

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Quimbly - 12 Jan 2007 23:46 GMT

Say cbRoadwayType is my combobox:

for (int i = 0; i < cbRoadwayType.Items.Count; i++)
{
cbRoadwayType.SelectedIndex = i;
int val = (int)cbRoadwayType.SelectedItem // INVALID EXCEPTION cast

if (val != FILTER_ALL && val != FILTER_NOT_SET)
{
roadwayList.Add(val);
}
}

But, I get an invalid exception cast. How do I just get the value of the
combobox item, based on an index?!

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Quimbly - 12 Jan 2007 23:58 GMT

Oops, sorry, my original code was:

for (int i = 0; i < cbRoadwayType.Items.Count; i++)
{
int val = (int)cbRoadwayType.Items[i];

if (val != FILTER_ALL && val != FILTER_NOT_SET)
{
roadwayList.Add(val);
}
}

> Say cbRoadwayType is my combobox:
>
[quoted text clipped - 11 lines]
> But, I get an invalid exception cast. How do I just get the value of the
> combobox item, based on an index?!

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Peter Thornqvist - 13 Jan 2007 14:32 GMT

Are the combox items ints to begin with?

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Regards, Peter

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Chad Z. Hower - 14 Jan 2007 10:22 GMT

> for (int i = 0; i < cbRoadwayType.Items.Count; i++)
> {
[quoted text clipped - 5 lines]
> }
> }

We dont know what type is in your combobox. What did you add?

Furthermore, you should use a foreach instead of a normal for loop in
this situation.

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Chad Z. Hower
Microsoft Regional Director
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IKEAS - 14 Jan 2007 17:52 GMT

maby you must use foreach

foreach(object o in combo.items)
{
    try
    {
        int i = (int)o;
        .... somes codes
    }
    catch
    {
        Console.WritLine("error with object type " + o.GetType().ToString())
    }
}

Quimbly a écrit :

> Say cbRoadwayType is my combobox:
>
[quoted text clipped - 11 lines]
> But, I get an invalid exception cast. How do I just get the value of the
> combobox item, based on an index?!

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Peter Thornqvist - 14 Jan 2007 21:00 GMT

> maby you must use foreach

It should work either way. I suspect the OP didn't store ints in the
combobox to start with. That's why he gets the invalid cast error

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Regards, Peter

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How to iterate over a combobox's items?

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