using System.Globalization; using System.Windows.Data; namespace Sai.Toolkit.Mvvm.Converters; public class StringsIsNotNullOrEmptyCheck : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { foreach (var item in values) { string s = item.ToString(); if (string.IsNullOrWhiteSpace(s)) { return false; } } return true; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new NotImplementedException(); } }