你可以如果您能够并愿意装饰数据源，请使用 TypeConverter 属性具有自定义属性。

You can use a TypeConverter if you're able and willing to decorate the data source property with a custom attribute.

否则，您必须附加到 Parse 和 格式 个 绑定 对象。这不幸的是，除了最简单的情况之外，消除了使用设计器进行绑定。

Otherwise you have to attach to the Parse and Format events of a Binding object. This, unfortunately, eliminates using the designer for your binding for all but the simplest scenarios.

例如，假设你想要一个 TextBox 绑定到一个表示公里的整数列，你想要视觉表示以英里为单位：

For example, let's say you wanted a TextBox bound to an integer column representing kilometers and you wanted the visual representation in miles:

在构造函数中：

Binding bind = new Binding("Text", source, "PropertyName");

bind.Format += bind_Format;
bind.Parse += bind_Parse;

textBox.DataBindings.Add(bind);

...

void bind_Format(object sender, ConvertEventArgs e)
{
    int km = (int)e.Value;

    e.Value = ConvertKMToMiles(km).ToString();
}

void bind_Parse(object sender, ConvertEventArgs e)
{
    int miles = int.Parse((string)e.Value);

    e.Value = ConvertMilesToKM(miles);
}