//private void BindValue(DependencyObject target, string targetPropertyName)
//{
//var source = _source as DependencyObject;
//if (source == null) return;
////此处需要注意，如果是表达式，需要使用表达式
//var sourceValue = source.GetActualValue(_sourceProperty);
//if (this.Converter != null)
//{
// var parameter = this.Parameter ?? target;//默认将目标对象作为参数传递
// var exp = sourceValue as Expression;
// if (exp == null)
// sourceValue = this.Converter.Convert(sourceValue, parameter);
// else
// sourceValue = new ValueConverterExpressionWrapper(exp, this.Converter, parameter);
//}
//target.SetValue(targetPropertyName, sourceValue);
//}
#endregion
#region 设置值
public override bool SetValue(DependencyObject d, DependencyProperty dp, object value)
{
d.ClearExpression(dp); //清理属性的值,移除表达式，设置值为默认值
d.SetValue(dp, value);
return(true);
}
