添加项目文件。

Wpf.Ui.Extend/Converters/MathRoundConverter.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace Wpf.Ui.Extend.Converters;
+public class MathRoundConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        var d = (double)value;
+        return Math.Round(d,  MidpointRounding.AwayFromZero);
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        var str = value.ToString();
+        if (double.TryParse(str, out var d))
+        {
+            return d;
+        }
+        return Binding.DoNothing;
+    }
+}