千问写完触发器功能，错误未修复

DMS.WPF/Converters/NullableTimeSpanToSecondsConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace DMS.WPF.Converters
+{
+    /// <summary>
+    /// 可空 TimeSpan 到秒数字符串的双向转换器。
+    /// 用于在 TextBox 和 TimeSpan? 之间进行转换。
+    /// </summary>
+    public class NullableTimeSpanToSecondsConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is TimeSpan timeSpan)
+            {
+                return timeSpan.TotalSeconds.ToString(CultureInfo.InvariantCulture);
+            }
+            return "";
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is string str && !string.IsNullOrWhiteSpace(str))
+            {
+                if (double.TryParse(str, NumberStyles.Float, CultureInfo.InvariantCulture, out double seconds))
+                {
+                    return TimeSpan.FromSeconds(seconds);
+                }
+            }
+            return null; // Return null for invalid or empty input
+        }
+    }
+}