sharee.bike-App/TINK/TINK/View/StringNotNullOrEmptyToVisibleConverter.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using Xamarin.Forms;

namespace TINK.View
{
    /// <summary> Converts a string into visible state. If string is null or empty element becomes invisible.</summary>
    public class StringNotNullOrEmptyToVisibleConverter : IValueConverter
    {
        /// <summary> Converts a string into visible state.</summary>
        /// <param name="value">Text value from view model used to derive whether object is visible or not.</param>
        /// <returns>Boolean value indicating whether object is visible or not.</returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (value != null && value is string text && !string.IsNullOrEmpty(text));
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return "";
        }
    }
}