[英]How can I create effect hide numbers the credit card except the last 4 numbers?
您必須為此創建轉換器,這是示例。 只需在您的邏輯中替換您想要的內容,它就會起作用。
public class CreditCardNumberValueConverter : IValueConverter
{
public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var builder = new StringBuilder(Regex.Replace(value.ToString(), @"\D", ""));
foreach (var i in Enumerable.Range(0, builder.Length / 4).Reverse())
builder.Insert(4*i + 4, " ");
return builder.ToString().Trim();
}
public override object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return Regex.Replace(value.ToString(), @"\D", "");
}
}
然后從 xaml 使用它,如:
Text="{Binding CardNo, Converter={StaticResource CreditCardNumberValueConverter}}"
2 解決方案:
string MaskDigits(string input)
{
//take first 8 characters
string firstPart = input.Substring(0, 8);
//take last 4 characters
int len = input.Length;
string lastPart = input.Substring(len - 4, 4);
string maskedDigits = new String('*', 4);
return firstPart + maskedDigits;
}
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