当Source端Path所关联的数据与Target端目标属性数据类型不一致时，需要添加数据转换器，数据转换器是一个自定义的类，这个类需要实现IValueConverter接口，这个接口有两个方法需要实现：Convert和ConvertBack，当数据从Source流向Target时，将调用Convert方法，反之，将调用ConvertBack方法

例子，首先定义飞机类型

public enum Category    {        Bomber,        Fighter    }    public enum State    {        Available,        Locked,        Unknown    }    public class Plane    {        public Category Category { get; set; }        public string Name { get; set; }        public State State { get; set; }    }

Plane类型的Category将在界面上转换为图片，而State类型将会转换成界面上的CheckBox显示，由于存在两个转换，因此需要提供两个Converter，第一个转换是做Category类型与字符类型的转换，字符串是图片的路径

class CategoryToSourceConverter : IValueConverter    {        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)        {            Category c = (Category)value;            switch (c)            {                case Category.Bomber:                    {                        return @"\Icons\close.png";                    }                case Category.Fighter:                    {                        return @"\Icons\closeing.png";                    }                default:                    {                        return null;                    }            }        }        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)        {            return new NotImplementedException();        }    }

由于UI上不能修改图片，所以只实现了从Source到Target的转换

另一个转换用于将State数据转换为bool?

public class StateToNullableBoolConverter : IValueConverter    {        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)        {            State s = (State)value;            switch (s)            {                case State.Locked:                    {                        return false;                    }                case State.Available:                    {                        return true;                    }                case State.Unknown:                default:                    {                        return null;                    }            }        }        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)        {            bool? nb = (bool?)value;            switch (nb)            {                case true:                    {                        return State.Available;                    }                case false:                    {                        return State.Locked;                    }                case null:                default:                    {                        return State.Unknown;                    }            }        }    }

界面代码：

加粗的部分是XAML中对转换器的使用，后台代码中实现了Load和Save两个按钮的点击事件

private void buttonLoad_Click(object sender, RoutedEventArgs e)        {            List
     
       planeList = new List
      
       ()            {                new Plane(){Category=Category.Bomber, Name="B-1", State=State.Unknown},                new Plane(){Category=Category.Bomber, Name="B-2", State=State.Unknown},                new Plane(){Category=Category.Fighter, Name="F-22", State=State.Unknown},                new Plane(){Category=Category.Fighter, Name="Su-47", State=State.Unknown},                new Plane(){Category=Category.Bomber, Name="B-52", State=State.Unknown},                new Plane(){Category=Category.Fighter, Name="J-10", State=State.Unknown}            };            listBoxPlane.ItemsSource = planeList;        }        private void buttonSave_Click(object sender, RoutedEventArgs e)        {            StringBuilder sb = new StringBuilder();            foreach (Plane p in listBoxPlane.Items)            {                sb.AppendLine(string.Format("Category={0}, Name={1}, State={2}", p.Category, p.Name, p.State));            }            File.WriteAllText(@"d:\PlaneList.txt", sb.ToString());        }
      
     

界面效果如图：

当改变checkbox的选中状态时，Plane对象中的值会发生变化