优化更新代码，添加界面功能并整合

WPFluent/Converters/StringIsEmptyConverter.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Windows.Data;
+
+
+namespace WPFluent.Converters;
+
+/// <summary>
+/// 判断值是否为空
+/// </summary>
+public class StringIsEmptyConverter : IValueConverter
+{
+    #region IValueConverter 成员
+    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+    { return string.IsNullOrEmpty(System.Convert.ToString(value)); }
+
+    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+    { return null; }
+    #endregion
+}