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src/GuiApp/Avalonia/FileTime.GuiApp/Converters/ExceptionToStringConverter.cs

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+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace FileTime.GuiApp.Converters
+{
+    public class ExceptionToStringConverter : IValueConverter
+    {
+        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            if (value is not Exception e) return value;
+
+            if (e is UnauthorizedAccessException)
+            {
+                return e.Message;
+            }
+            else if (e.InnerException != null)
+            {
+                return TraverseInnerException(e);
+            }
+
+            return FormatException(e);
+        }
+
+        private static string TraverseInnerException(Exception e)
+        {
+            string s = "";
+            if (e.InnerException != null) s += TraverseInnerException(e.InnerException) + Environment.NewLine;
+            else return FormatException(e);
+
+            s += "In: " + FormatException(e);
+
+            return s;
+        }
+
+        private static string FormatException(Exception e)
+        {
+            return $"{e.Message} ({e.GetType().FullName})";
+        }
+
+        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}