我有一个列出所有可能设置的枚举:
public enum Settings
{
Settings1,
Settings2,
Settings3
}
在我的用户控件中,我想实现一个新的依赖属性,它包含一个设置列表,并能够像这样使用它:
<my:Control Settings="Settings1, Settings2" />
我该如何实现?
答案 0 :(得分:3)
在UserControl中,将您的Dependency属性设为Settings
的集合(可能将您的枚举重命名为Setting
),然后您可以在XAML中填充它:
<my:Control>
<my:Control.Settings>
<x:Static Member="my:Setting.Setting1" />
<x:Static Member="my:Setting.Setting2" />
</my:Control.Settings>
</my:Control>
我没有测试过这个:)
如果您想坚持使用逗号分隔列表,然后将UserControl Settings DP设为字符串,然后在属性更改事件处理程序上,拆分字符串并在每个结果上使用Enum.Parse
将设置存储为你的Setting
枚举类型。
答案 1 :(得分:0)
public class StringDelimitedToEnumListConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
List<Settings> retval = new List<Settings>();
if(value == null || value.GetType() != typeof(string) || targetType != typeof(List<Settings>) )
{
throw new ArgumentException("value must be of type string, target type must be of type List<Settings>");
}
string workingValue = value.ToString();
if (String.IsNullOrEmpty(workingValue))
{
throw new ArgumentException("value must not be an empty string");
}
if (workingValue.Contains(','))
{
string[] tokens = workingValue.Split(',');
foreach (string s in tokens)
{
retval.Add((Settings)Enum.Parse(typeof(Settings), s));
}
return retval;
}
else
{
//there was only 1 value
retval.Add((Settings)Enum.Parse(typeof(Settings),workingValue);
return retval;
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
//do we care?
throw new NotImplementedException();
}
}