Using Type instead of specific class

Question

I have this code:

if (((Classes.ProductGroup)o).ToString().Contains(comboBox.Text)) 
   return true;
else 
   return false;

Now I want not to specify the part Classes.ProductGroup. I want to make it universal.

How can I replace the part Classes.ProductGroup with a Type object?

Type type = typeof(Classes.ProductGroup);

Something similar to this:

if (((type)o).ToString().Contains(comboBox.Text))

Is this possible?

Here is the complete method code:

private void FilterPGsinComboBox(object obj)  
{
    if (!Dispatcher.CheckAccess())
    {
        Dispatcher.Invoke(new FilterPGsinComboBoxDelegate(this.FilterPGsinComboBox),obj);
        return;
    }
    Type type = ((Dictionary<ComboBox, Type>)obj).First().Value;
    ComboBox comboBox = ((Dictionary<ComboBox, Type>)obj).First().Key;
    comboBox.IsDropDownOpen = true;
    CollectionView itemsViewOriginal = (CollectionView)CollectionViewSource.GetDefaultView(comboBox.ItemsSource);

    itemsViewOriginal.Filter = ((o) =>
    {
        if (String.IsNullOrEmpty(comboBox.Text)) 
            return true;
        else
        {
            if (((Classes.ProductGroup)o).ToString().Contains(comboBox.Text)) 
                return true;
            else 
                return false;
        }
    });

    itemsViewOriginal.Refresh();
}

what is o and please provide what function you want to achieve — Lei Yang
– Lei Yang, Commented Mar 29, 2017 at 8:52
@ASh - unless that class or one of its ancestors has shadowed the method. (But that does raise the question of why someone would think to do so) — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented Mar 29, 2017 at 8:53

ASh · Accepted Answer · 2017-03-29 09:38:30Z

1

string ToString() method is defined in the base Object class. cast to concrete type is redundant.

string filter = comboBox.Text;

itemsViewOriginal.Filter = o => String.IsNullOrEmpty(filter) || 
                                o != null && o.ToString().Contains(filter);

answered Mar 29, 2017 at 9:38

ASh

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Comments

Mighty Badaboom · Accepted Answer · 2017-03-29 09:01:55Z

1

You can use generics and build a method like

public bool ClassNameContainString<T>(string text) where T : class
{
    var containsString = typeof(T).ToString().Contains(text);

    return containsString;
}

If you want to make this method case insensitive change the logic to

var containsString = typeof(T).ToString().ToLower().Contains(text.ToLower());

answered Mar 29, 2017 at 9:01

Mighty Badaboom

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3 Comments

Chris Over a year ago

My understanding was that the OP wanted to do ((T)o).ToString(). Its not entirely clear but changing from a cast of an object to using a type seems less likely than changing from casting to a fixed object to a variable object.

dns_nx Over a year ago

but doesn't this function misses the object o? and then I'm in the situation I was before...

dns_nx Over a year ago

Chris, you're right. I wanted to cast o as given type.

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