.NET (Core and Framework)

Member 2256533 wrote:

And the speed of the switch seems to be the amount of information contained in the datagrid views

Robert Croll wrote:

If the GC attempts to collect ClassB and finds ClassA subscribes to an event of ClassB. Will ClassB be removed from memory?

Robert Croll wrote:

If the GC attempts to collect ClassA and finds it subscribes to an event of ClassB. Will ClassA be removed from memory?

Robert Croll wrote:

If the GC attempts to collect ClassA and finds it subscribes to an event of ClassB. Will ClassA be removed from memory?
If the GC attempts to collect ClassB and finds ClassA subscribes to an event of ClassB. Will ClassB be removed from memory?

Robert Croll wrote:

I was not aware of this issue but the person interviewing me seemed concerned

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Herboren wrote:

im curious why "Default" keeps showing at the top

MSDN[^] states:

All items should be assigned to groups before they are displayed. Any items that are not assigned to a group will appear in the default group, which has the header label "DefaultGroup{0}". The default group is not contained in the Groups collection, and cannot be altered. It is primarily useful in debugging to ensure that all items have been properly added to groups.

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lukeer wrote:

But the DropDown list doesn't drop down any longer.

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                 |  UITypeEditor                    | No UITypeEditor
-----------------+----------------------------------+-----------------------------
TypeConverter    |  Arrow Button without            | No arrow button
                 |  function                        | at all
-----------------|----------------------------------+-----------------------------
No TypeConverter |  Arrow Button without            | DropDown works, but
                 |  function (Function can          | without Translation
                 |  be achieved by                  |
                 |  UITypeEditor.GetEditStyle()     |
                 |  returning                       |
                 |  UITypeEditorEditStyle.None)     |

lukeer wrote:

Yes, I did. And since then it is that the standard entry is being translated but the arrow button indicating a drop down list is missing.

lukeer wrote:

but the arrow button indicating a drop down list is missing.

lukeer wrote:

I can get the arrow button back by decorating with an additional UITypeEditor. That UITypeEditor's GetEditStyle() method is to return UITypeEditorEditStyle.DropDown regardless of its context.

lukeer wrote:

And another dropdown, this one without TypeConverter doesn't drop down either.

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public class TranslationTypeConverter : System.ComponentModel.TypeConverter
{
    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
        if (destinationType.Equals(typeof(string)))
            return (true);

        return base.CanConvertTo(context, destinationType);
    }


    public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
    {
        if (destinationType.Equals(typeof(string)))
        {
            // Get translation talbe name
            //if(_typeToConvert.IsNested)
            Type typeToConvert = context.PropertyDescriptor.PropertyType;
            string tableName = typeToConvert.DeclaringType.FullName;

            // Create resource manager
            System.Resources.ResourceManager rm = new System.Resources.ResourceManager(tableName, typeToConvert.Assembly);

            // Find string
            string key = typeToConvert.Name + "_" + value.ToString();
            string convertedString = rm.GetString(key);

            if (
                convertedString == null
                || convertedString.Length <= 0
            )
                convertedString = value.ToString();

            return (convertedString);
        }

        return base.ConvertTo(context, culture, value, destinationType);
    }


    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        if (sourceType.Equals(typeof(string)))
            return (true);

        return base.CanConvertFrom(context, sourceType);
    }


    public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
    {
        // Not implemented yet.
        //  Just use standard values.
        return (base.ConvertFrom(context, culture, value));
    }
}

lukeer wrote:

As you will see neither GetStandardValuesSupported nor GetStandardValues are overridden yet. Would that be necessary?

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lukeer wrote:

What I don't understand is that by not overriding GetStandardValuesSupported and GetStandardValues I suspect the base class to take care of them.

lukeer wrote:

Why doesn't the base class make PropertyGrid show a drop down list while without applying my derived class at all it works?

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