不实现接口成员（C＃）

Question

'StringToVisibilityConverter' does not implement interface member 'System.Windows.Data.IValueConverter.Convert(object, System.Type, object, System.Globalization.CultureInfo)'

Any idea what's wrong with this? As far as I know my imports are correct

public class StringToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, 
                          object parameter, CultureInfo culture)
    {
        if (value != null && value is string)
        {
            var input = (string)value;
            if (string.IsNullOrEmpty("Name"))
            {
                return Visibility.Collapsed;
            }
            else
            {
                return Visibility.Visible;
            }
        }

        return Visibility.Visible;
    }

Answer 1

You need to implement the ConvertBack method as well. IValueConverter

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
 //Your code goes here
}

Answer 2

From the documentation http://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter.aspx I see that must implement and ConvertBack.

The issue could appear event the class CultureInfo is not from System.Globalization.CultureInfo and is a custom class.

Answer 3

是的，在继承IValueConverter时，还需要使用以下方法：

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)