优化更新代码，添加界面功能并整合

WPFluent/Controls/NumberBox/NumberBoxValueChangedEventArgs.cs

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+
+
+
+// This Source Code is partially based on the source code provided by the .NET Foundation.
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+
+
+public delegate void NumberBoxValueChangedEvent(object sender, NumberBoxValueChangedEventArgs args);
+
+/// <summary>
+/// Provides information for the <see cref="NumberBox.ValueChanged"/> event.
+/// </summary>
+public class NumberBoxValueChangedEventArgs : RoutedEventArgs
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="NumberBoxValueChangedEventArgs"/> class. />
+    /// </summary>
+    /// <param name="oldValue">
+    /// The value of the <see cref="NumberBox.Value"/> property before the change reported by the relevant event or
+    /// state change.
+    /// </param>
+    /// <param name="newValue">
+    /// The value of the <see cref="NumberBox.Value"/> property after the change reported by the relevant event or state
+    /// change.
+    /// </param>
+    /// <param name="source">
+    /// An alternate source that will be reported when the event is handled. This pre-populates the <see
+    /// cref="RoutedEventArgs.Source"/> property.
+    /// </param>
+    internal NumberBoxValueChangedEventArgs(double? oldValue, double? newValue, object source) : base(
+        NumberBox.ValueChangedEvent,
+        source)
+    {
+        OldValue = oldValue;
+        NewValue = newValue;
+    }
+
+    /// <summary>
+    /// Gets the value of the <see cref="NumberBox.Value"/> property after the change.
+    /// </summary>
+    /// <returns>The property value after the change.</returns>
+    public double? NewValue { get; private set; }
+
+    /// <summary>
+    /// Gets the value of the <see cref="NumberBox.Value"/> property before the change.
+    /// </summary>
+    /// <returns>The property value before the change.</returns>
+    public double? OldValue { get; private set; }
+}