kmpdfkit_demo/Demo/Examples/Compdfkit.Controls/Common/Convert/AntiStringToVisibilityConverter.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
using System.Windows;

namespace ComPDFKit.Controls.Common
{
    [ValueConversion(typeof(string), typeof(Visibility))]
    class AntiStringToVisibilityConverter : IValueConverter
    {
        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if ((value as string) != string.Empty)
            {
                return Visibility.Visible;
            }
            else
            {
                return Visibility.Collapsed;
            }
        }

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