WpfApplication4/L2BConverer.cs

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

namespace WpfApplication4
{
    class L2BConverer : IValueConverter
    {
        public object Convert(object value,Type targetType,object parameter,CultureInfo culture)
        {
            //获取输入值并强制转换
            int textLength = (int)value;
            //三目运算符：判断数值长度是否>6 ? 是返回true : 否返回false
            return textLength > 6 ? true : false;
        }
        public object ConvertBack(object value,Type targetType,object parameter,CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}