CODEWITHSUNDEEP
c#collectionspropertygrid
Simon
Simon

Reputation: 8349

PropertyGrid collection display text

In C#, when using a PropertyGrid where an object has a Collection, what determines if the value next to the DisplayName shows the value of "(Collection)"?

Is there a specific attribute for this value?

Thanks

Upvotes: 5

Views: 1703

Answers (2)

The Lemon
The Lemon

Reputation: 1389

Kaya's answer didn't work for me - but - I found when you have any type converter, the property grid will show base.ToString() instead of (Collection), we can use that.

public class CollectionToStringOverrideConverter : TypeConverter
{
}
[TypeConverter(typeof(CollectionToStringOverrideConverter))]
public class FormattedList<T> : List<T>
{
    public override string ToString()
    {
        if (this?.Count > 0)
            return string.Join("|", this);
        return "No items in collection";
    }
}

The FormattedList class now has a type converter, so the default ToString() is used, and we can put whatever we want there. Just define your property as a FormattedList instead of a List and you're set.

Upvotes: 0

kaya
kaya

Reputation: 754

You can use TypeConverters.

public class MyCollectionTypeConverter : TypeConverter
{
    public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
    {
        if (value is List<string>)
        {
            return string.Join(",", ((List<string>) value).Select(x => x));
        }
        return base.ConvertTo(context, culture, value, destinationType);
    }
}

and add as attribute;

    [TypeConverter(typeof(MyCollectionTypeConverter))]
    public List<string> Prop1 { get; set; }

Ref: How to: Implement a Type Converter

Upvotes: 4

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