Xamarin DataForm Documentation | Converter Attribute

ConverterAttribute

There are cases when the editors require types that are not the same as the property type defined in the business object. In these case users can use a converter class. This is a custom class implementing the IPropertyConverter interface. The next example demonstrates how such converted can be used.

Example

In this example we will demonstrate how we can use a number picker editor, which supports double type, for property of type decimal. First, you need a proper converter:

class DecimalToDoublePropertyConverter : IPropertyConverter
{
    public object Convert(object value)
    {
        return System.Convert.ToDouble((decimal)value);
    }

    public object ConvertBack(object value)
    {
        return System.Convert.ToDecimal((double)value);
    }
}

Here is the decoration of the source class with attributes:

public class Item : NotifyPropertyChangedBase
{
    decimal price;

    [DisplayOptions(Header = "Name")]
    public string Name { get; set; } = "vase";

    [DisplayOptions(Header = "Price")]
    [Converter(typeof(DecimalToDoublePropertyConverter))]
    public decimal Price
    {
        get
        {
            return this.price;
        }
        set
        {
            if (this.price != value)
            {
                this.price = value;
                this.OnPropertyChanged();
            }
        }
    }
}

Finally, you have to register a number picker editor for the item Price property:

ConverterAttribute

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